GPI GM Series User manual

2
• When measuring flammable liquids, observe precau-
tions against fire or explosion.
• When working in hazardous environments, always
exercise appropriate safety precautions.
• When applying external power to the transmitter, use
DC power only.
• Disconnect external power to the transmitter before
detaching or attaching input or output wires.
• Ground loops between sensor and user equipment can
damage the transmitter and can be dangerous.
• If you cannot galvanically isolate the sensor from earth
ground, you may need to use the transmitter’s optically
isolated inputs.
• Be sure O-rings and seals are kept in good repair.
Installation should be performed only by qualified
personnel, and in accordance with local governing
regulations.
The following installation guidelines are separated by meter
series and mounting type.
Precision G Series:
• Local – The GX510 4-20 mA Out with Display mounts
directly to the 1 inch MNPT conduit connector.
• Remote – The GX500 4-20 mA Out with Display
connects via an output cable as shown in the Wiring
Diagram.
Industrial Grade G2 Series:
• Local – The GX510 4-20 mA Out with Display requires
the GPI Conduit Connector Kit (Part #113437-01) for
local mounting to the G2 series meter.
• Remote – The GX500 4-20 mA Out with Display
connects via an output cable as shown in the Wiring
Diagram.
Commercial Grade A1 Series:
• Local – The GX510 4-20 mA Out with Display requires
the GPI Conduit Connector Kit (Part #113437-01) for
local mounting to the A1 series meter.
• Remote – The GX500 4-20 mA Out with Display
connects via an output cable as shown in the Wiring
Diagram.
GM Oval Gear Series:
• Local – The 4-20 mA Out with Display is mounted
directly to the oval gear meter housing.
GENERAL INFORMATION
This manual will assist you in operating and maintaining
the GPI electronics supplied with your GPI meter or as an
accessory unit on both local and remote models. The GPI
Electronics can be used in indoor or outdoor applications
where occasional exposure to moisture is common.
• The 4-20 mA Out with Display is available in two ver-
sions. One indicates flowrate in units/minute and one
in units/hour. Both indicate flow totals in gallons and
litres.
• The 4-20 mA Out with Display can be used on all GPI
models, including the Precision G series, the Industrial
Grade G2 series, the Commercial Grade A1 series,
and the positive displacement GM series oval gear
meters.
Product differences in this manual are identified by either,
Local or Remote as necessary.
The Display may come calibrated from the factory for gal-
lons “GAL” and litre “LTR” and be locked out “PRESET” to
prevent unwanted calibrations. Field calibrations are available
on “CAL B” and “CAL C.”
If the unit was purchased as an accessory or remote, the
calibration has not been entered and the end user will need
to configure and calibrate the display. The gallon and litre
calibration may then be locked out using the configuration
procedure.
To determine if the 4-20 mA Out with Display has been con-
figured and calibrated at the factory to your specific meter,
view the display. If “GAL” or “LTR” is followed by the word
“PRESET,” the unit has been configured and calibrated. If
“GAL” or “LTR” is not followed by the word “PRESET,” the
display must be configured and calibrated in the field.
The GPI 4-20 mA Out with Display is a flow totalizer and rate
meter with industry standard current loop output. The unit is
loop powered, and provides a 4-20 mA analog output propor-
tional to the frequency signal for communication with PLCs
and other customer equipment. The 4-20 mA (or 0-20 mA)
output is calibrated under actual flow conditions with simple
push-button calibration. Auxiliary output includes 0-5 VDC.
The microprocessor-based electronics have extremely low
power requirements and are completely powered by the
4-20 loop. The electronics provides the options of local (on
the meter) and/or remote (up to 5,000 feet) display. Flow total
and rate are displayed on a large 6-digit LCD readout with
two-point floating decimal for totals from .01 to 999,999. All
operations are easily accessed with the push buttons on the
display front panel.
This unit is not FM Approved. Therefore, use of this
transmitter with an approved metering system voids
FM Approval.
NOTE: This unit is loop powered, requiring an input power
supply of 8.5 to 35 volts (24 VDC is recommended).
NOTE: Setpoint calibration of the unit is required for the 4-20
mA, 0-20 mA, and 0-5 V output options.
SAFETY INSTRUCTIONS
INSTALLATION
CAUTION
CAUTION

Terminal Connections
Remote Transmitter INPUTS / OUTPUTS
ISO-IN COM: Return for
isolated inputs
ISO-LF IN: Optically-Isolated
High-level Low-frequency
Input
ISO-HF IN: Optically-Isolated
High-level High-frequency
Input
HL-LF IN: High-level Low-
frequency Input. 150 Hz
maximum
COIL-A IN: Low-level
Sinewave Input
COIL-B IN: Low-level
Sinewave Input
HL-HF IN: High-level High-
frequency Input
EDM PWR: Local Vcc. Regu-
lated 5-VDC internal power.
This terminal can supply up
to approximately 2.5 mA,
continuously, to external
circuitry. Typical load/line regulation under ordinary conditions is about ± 10%
LOCAL COM: Local Common
0-5 V OUT: 0 to 5 V Voltage Output. Frequency to Analog Output.
PULSE OUT: Pulse-Out Frequency Output Signal. It is an “open-collector” output
(also known as “n-p-n” or “current-sinking”), referenced to transmitter Local-
Common
LOOP (–): 4 to 20 mA Current Loop – current into transmitter
LOOP (+): 4 to 20 mA Current Loop – current out of transmitter
ISO-IN COM
ISO-LF IN
ISO-HF IN
HL-LF IN
COIL-A IN
COIL-B IN
HL-HF IN
EDM PWR
LOCAL COM
LOCAL COM
0-5 V OUT
PULSE OUT
LOOP (–)
LOOP (+)
WIRING
3
• Remote – The GX500 4-20 mA Out with Display
connects via an output cable as shown in the Wiring
Diagram.
Mount the GPI 4-20 mA Out with Display using bolts, screws
or standard U-bolts for pipes. Mounting options include:
• Wall
• Pipe
• Meter (1 inch FNPT conduit connection required)
Environmental
Choose a mounting location suitable for the 4-20 mA Out with
Display. The ideal mounting location is where the:
• flowmeter is as close as possible.
• mounting surface has minimal vibration.
• ambient temperature is +32°F to +140°F (0°C to
+60°C).
• cable lengths are minimal.
Avoid mounting locations where the 4-20 mA Out with Dis-
play is:
• subject to constant exposure to water or other liquids
(occasional low-pressure splashing will not harm unit
if cable entry points are well-sealed).
• subject to > 5g shock loading.
• facing the sun directly for long periods of time.
• close to high voltage/current runs, DC motors, internal
combustion engines, or frequency inverters.
Cable Guidelines
4-20 mA Current Loop:
• The current loop itself is very resistant to electrical noise
pickup and shielded cable is seldom needed except in
very “noisy” (electrical) locations and/or when very long
runs (thousands of feet) are used.
Sensor Cabling:
• Some products come with 20 ft. of shielded cable.
• If you require a longer cable, a 100 ft. cable kit is avail-
able from GPI, or use Belden 9363 cable. When wiring
longer lengths of cable, be sure to connect the shield
to LOCAL-COM ONLY! (Multiple shield connections
may cause ground-loop problems).
• Some trial and error may be needed because of the wide
variety of user conditions. Try to keep cable lengths
short!
This manual refers to various models of GPI flowmeters.
Determine what type of input the electronics will receive and
what type of output, if any, you require. Use the diagrams
found in the wiring diagrams section, if the unit is not already
wired, to correctly wire the system.
The display is externally powered by the loop.
NOTE: Totals will be lost with loss of power on loop.
The 4-20 mA Out with Display may come with 20 ft. of cable
to connect to the meter. The customer must supply the com-
munication loop cable. Although the unit is usually powered
through the communication loop, there are some circum-
stances that might require external power.
Connecting the Equipment:
• Remove the faceplate by removing the four (4) corner
screws.
• Attach wiring from your equipment according to the
following terminal connections and wiring diagrams,
depending on your circumstances.
Determine maximum power supply voltage after de-
termining maximum allowable voltage of all electronic
devices in the system.
CAUTION

4
W I R I N G D I A G R A M 1
— 4-20 mA or 0-20 mA Output —
Customer Equipment with Built-in Power Supply
Input: Turbine Mounted Display or Conditioned Signal Sensor (Open Collector)
Output: Customer Equipment, 0-20 mA Sensing, Built-in Loop Power Supply
Note Regarding Resistor “R”: R not generally required for distance up to 25 ft.
Use R = 10k (10000 ohms) for distance up to 50 ft.
Use R = 5.1k (5100 ohms) for distance up to 100 ft.
Use R = 2.7k (2700 ohms) for distance up to 250 ft.
Do not use R less than 2.4k (ohms)
CAUTION: When reassembling the faceplate,
make sure that the enclosure seal is not
crimped or twisted. Do not over-tighten
corner screws (hand tighten only). Face-
plate can be rotated 90°.
GPI
Meter
Ext. Power
(Red)
Pulse Out
(White)
Common
(Black)
Shield recommended.
If used, connect to
transmitter’s local
com ONLY! Local Com
HL-HF IN
R
(See note)
EDM Power
INPUTS OUTPUTS
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current)
Min. V = 8.5
Max. V = 35
Customer
Equipment
➤ Minimum signal amplitude required for normal operation approx. 15 mV P-P
➤ Recommended cable type – twisted pair with shield
➤ Recommended maximum cable length – 20 ft.
CAUTION: When reassembling the faceplate,
make sure that the enclosure seal is not
crimped or twisted. Do not over-tighten
corner screws (hand tighten only). Face-
plate can be rotated 90°.
W I R I N G D I A G R A M 2
— 4-20 mA or 0-20 mA Output —
Customer Equipment With Built-in Power Supply – High Temp Applications
Input: Standard Remote Sensor (Variable Reluctance Pickup Coil)
Output: Customer Equipment, 0-20 mA Sensing, Built-in Loop Power Supply
GPI Meter
Unpowered
Pickup Coil
Only
Coil-A
Coil-B
Shield recommended.
Connect shield to
transmitter’s local
com ONLY! Local Com
INPUTS OUTPUTS
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current)
Min. V = 8.5
Max. V = 35
Customer
Equipment
Coil-A
Coil-B

5
NOTE: Minimum loop power supply voltage required:
8.5V + (Max - Customer - Equipment - Drop) +
(Wiring - IR - Drop)
CAUTION: When reassembling the faceplate,
make sure that the enclosure seal is not
crimped or twisted. Do not over-tighten
corner screws (hand tighten only).
Faceplate can be rotated 90°.
W I R I N G D I A G R A M 3
— 4-20 mA or 0-20 mA Output —
Customer Equipment Without Built-in Power Supply
Input: Turbine Mounted Display or Conditioned Signal Sensor (See inputs from Diagram 1) Standard Remote Sensor (See inputs from Diagram 2)
Output: Customer Equipment, 0-20 mA Sensing, Separate Power Supply
Frequency-Generating
Input Device
INPUTS OUTPUTS
4-20 mA Out
with Display Loop (+)
Loop (–)
(current)
(current)
Min. V = 8.5
Max. V = 35
Customer Equipment
(+) (–)
Loop Power Supply
Typ 12 – 24 VDC
Loop (+) Input
Loop (–) Input
NOTE 1: Loop power supply electrically isolated
from customer equipment
NOTE 2: Actual value of loop current (mA) is
disregarded
CAUTION: When reassembling the faceplate,
make sure that the enclosure seal is not
crimped or twisted. Do not over-tighten
corner screws (hand tighten only). Face-
plate can be rotated 90°.
W I R I N G D I A G R A M 4
— 0-5 V Output —
Customer Equipment Without Built-in Power Supply
Input: Turbine Mounted Display or Conditioned Signal Sensor (See inputs from Diagram 1) Standard Remote Sensor (See inputs from Diagram 2)
Output: Customer Equipment, 0-5 V Sensing, Separate Loop Power Supply
Frequency-Generating
Input Device
INPUTS OUTPUTS
4-20 mA Out
with Display Loop (+)
Loop (–)
(current)
(current)
Customer Equipment
(+) (–)
Loop Power Supply
Typ 12 – 24 VDC
0-5 V Analog Input (+)
Analog In Return (–)
0-5 V Output
Local Com

6
NOTE 1: Loop power supply electrically isolated
from customer equipment
NOTE 2: Actual value of loop current (mA) is
disregarded
CAUTION: When reassembling the faceplate,
make sure that the enclosure seal is not
crimped or twisted. Do not over-tighten
corner screws (hand tighten only). Face-
plate can be rotated 90°.
W I R I N G D I A G R A M 5
— Pulse Output —
Customer Equipment Without Built-in Power Supply
Input: Turbine Mounted Display or Conditioned Signal Sensor (See inputs from Diagram 1) Standard Remote Sensor (See inputs from Diagram 2)
Output: Customer Equipment, Frequency Sensing, Separate Loop Power Supply
Frequency-Generating
Input Device
INPUTS OUTPUTS
4-20 mA Out
with Display Loop (+)
Loop (–)
(current)
(current)
Customer Equipment
(+) (–)
Loop Power Supply
Typ 12 – 24 VDC
Open-Collector Pulse In
Pulse-In Return
Pulse Out
Local Com
W I R I N G D I A G R A M 6
— 4-20 mA or 0-20 mA Output —
Customer Equipment with Built-in Power Supply
Input: Reed Switch
Output: Customer Equipment, 0-20 mA Sensing, Built-in Loop Power Supply
CAUTION: When reassembling the faceplate,
make sure that the enclosure seal is not
crimped or twisted. Do not over-tighten
corner screws (hand tighten only). Face-
plate can be rotated 90°.
GPI
Meter
Signal
Common Local Com
* HL-LF IN
INPUTS OUTPUTS
GPI
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current)
Min. V = 8.5
Max. V = 35
Customer
Equipment
Pulse Out
EDM Pwr
Black Blue Red
PCB Assembly
* Optional to use HL-HF IN

CAUTION: When reassembling the faceplate, make sure that the enclosure
seal is not crimped or twisted. Do not over-tighten corner screws
(hand tighten only). Faceplate can be rotated 90°.
W I R I N G D I A G R A M 7
— 4-20 mA or 0-20 mA Output —
Customer Equipment With Built-in Power Supply
Input: Hall Effect *
Output: Customer Equipment, 0-20 mA Sensing, Built-in Loop Power Supply
GPI
Meter
Local Com
INPUTS OUTPUTS
GPI
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current)
Min. V = 8.5
Max. V = 35
Customer
Equipment
HL-HF IN
CAUTION: When reassembling the faceplate, make sure that the enclosure
seal is not crimped or twisted. Do not over-tighten corner screws
(hand tighten only). Faceplate can be rotated 90°.
W I R I N G D I A G R A M 8
— 4-20 mA or 0-20 mA Output —
Customer Equipment Without Built-in Power Supply
Input: Reed Switch (See inputs from Diagram 6) or Hall Effect * (See inputs from Diagram 7)
Output: Customer Equipment, 0-20 mA Sensing, Separate Loop Power Supply
GPI
Meter
INPUTS OUTPUTS
GPI
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current)
Min. V = 8.5
Max. V = 35
Customer
Equipment
(+) (–)
Loop Power Supply
Typ 12 - 24 VDC
Loop (–) Input
Loop (+) Input
Signal
(+) (–)
HE Power Supply
4.5 - 24 VDC
PCB Assembly
Pulse Out
EDM Pwr
Black Blue Red
Common (–)
* Note: Hall Effect requires dedicated power supply.
* Note: Hall Effect requires dedicated power supply.
7
Supply (+)

NOTE 1: Loop power supply electrically isolated from customer equipment
NOTE 2: Actual value of loop current (mA) is disregarded
W I R I N G D I A G R A M 9
— 0-5 V Output —
Customer Equipment Without Built-in Power Supply
Input: Reed Switch (See inputs from Diagram 6) or Hall Effect * (See inputs from Diagram 7)
Output: Customer Equipment, 0-5 V Sensing, Separate Loop Power Supply
GPI
Meter
INPUTS OUTPUTS
GPI
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current) Customer
Equipment
(+) (–)
Loop Power Supply
Typ 12 – 24 VDC
0-5 V Analog Input (+)
Analog In Return (–)
0-5 V Output
Local Com
NOTE 1: Loop power supply electrically isolated from customer equipment
NOTE 2: Actual value of loop current (mA) is disregarded
NOTE 3: 4-20 mA and Pulse Output option available only with Reed Switch input
W I R I N G D I A G R A M 1 0
— 4-20 mA or 0-20 mA Output and Pulse Output —
Customer Equipment With Built-in Power Supply
Input: Reed Switch
Output: Customer Equipment, 0-20 mA Sensing, Frequency Sensing, Built-in Loop Power Supply
GPI
Meter
INPUTS OUTPUTS
GPI
4-20 mA Out
with Display
Loop (+)
Loop (–)
(current)
(current)
Customer
Equipment
Common
Open Collector
Pulse-In
* HL-LF IN
Local Com
CAUTION: When reassembling the faceplate, make sure that the enclosure
seal is not crimped or twisted. Do not over-tighten corner screws
(hand tighten only). Faceplate can be rotated 90°.
CAUTION: When reassembling the faceplate, make sure that the enclosure
seal is not crimped or twisted. Do not over-tighten corner screws
(hand tighten only). Faceplate can be rotated 90°.
Min. V = 8.5
Max. V = 35
1
2
3
4
* Note: Hall Effect requires dedicated power supply.
8
* Optional to use HL-HF IN

9
DISPLAY CALIBRATE
ELECTRONIC
DIGITAL
METER
INDUSTRIAL
GRADE
D I S P L A Y 1
The calibration and display features may have been pro-
grammed at the factory, indicated by the word “PRESET”
on the display (see Display 1), and further user programming
is not required. If the unit was purchased as an accessory,
remote or as a spare part, the calibration features will not be
appropriate for the user installation and must be calibrated
before use. If desired, the display features can be changed
in the field.
OPERATIONS
Configuration determines what information is present on the
LCD display. For instance, total, flowrate, number of decimal
places, number of calibration curves, etc.
The Display has been programmed with many features, which
can be enabled by the end user through the configuration
process. By disabling unnecessary features, day-to-day
flowmeter operation can be greatly simplified, making the
unit easier to use. Alternately, there are several features not
found in the default configuration.
Available features include:
• 0 to 3 totals, either resettable (Batch) or non-resettable
(Accumulative).
• Flowrate in units per minute, hour or day or no flowrate.
• 1 to 3 different calibration curves.
• K-factor entry or Dispense-Display calibration proce-
dure.
• 0 to 3 decimal resolution (0000; 000.0; 00.00)
Changing Configuration Settings
Access to the configuration settings require a specific pro-
cedure and a pin code available through the GPI Web site at
www.gpi.net or call GPI Customer Serivce at 888-996-3837.
CONFIGURATION
About Calibration
Calibration determines that the information presented
matches your particular meter. For instance, the “S20N” 2
inch turbine has approximately 100 pulses per US gallon
whereas the “GM020” 2 inch oval gear meter has 25.3 pulses
per US gallon. The display must be calibrated for correct and
accurate display information.
To determine if the 4-20 mA Out with Display has been config-
ured and calibrated at the factory to your specific meter, view
the display. If “GAL” is followed by the word “PRESET,” the unit
has been configured and calibrated. If “GAL” is not followed
by the word “PRESET,” the display must be calibrated.
All non-PRESET displays must be calibrated before
use!
All operations are reflected in the LCD readout. The top line
identifies the calibration curve. The middle line reflects flow
information. The bottom line shows information from the
totalizer. Words or “flags” display on the top and bottom line
to further identify specific information.
NOTE: Operations can be practiced prior to installation. To
simulate flow conditions, blow gently through the meter.
Turn On
The unit is on when any display is present. It turns on automati-
cally when liquid flows through the meter. It can be turned on
manually by pressing and releasing the DISPLAY button.
Turn Off
Whenever no flow has been sensed for one minute, the unit
automatically switches to a power-saving “sleep” mode with
a blank display. The unit will automatically “wake up” the mo-
ment any flow is sensed and will remain awake as long as fluid
is flowing. Totals are never lost during sleep periods.
Batch and Cumulative Totals
Total flags are displayed on the bottom line. The Cumula-
tive Total (labeled TOTAL 1 LOCKED) is the total of all fluid
measured since the meter’s power was connected. (At your
first use, the Cumulative Total may not read zero because of
calibration at the factory.) The Batch Total (labeled TOTAL 2)
indicates flow during a single use.
Clearing a Totalizer
The Batch totalizer register (TOTAL 2) may be independently
cleared to 0.00 at any time. To clear a batch totalizer, with
the desired totalizer displayed, press and hold the DISPLAY
button. At about 3 seconds, the displayed total will be cleared
to “0.00.” You can do this even while fluid is flowing, in which
case counting will resume after you release the DISPLAY
button.
The Cumulative totalizer register is labeled as TOTAL 1
LOCKED indicating that it cannot be manually zeroed (See
Display 2). The Cumulative totalizer can be cleared only when
the batteries are removed, go dead or when the Cumulative
Total reaches the maximum value of 999,999.
WARNING

DISPLAY CALIBRATE
ELECTRONIC
DIGITAL
METER
INDUSTRIAL
GRADE
Changing Display Registers
To change to another totalizer register or to FLOWRATE mode
during normal operation, watch the bottom line display flags
while you briefly press and release the DISPLAY button. When
you press and release the display buttons, the mode will ad-
vance as follows: TOTAL 1 LOCKED (Cumulative Total), TOTAL
2 (Batch Total), FLOWRATE, TOTAL 1 LOCKED (etc.). You can
change registers at any time, even during flow. Non-visible
totalizer registers will continue to accumulate.
NOTE: Generally, display registers change when the buttons
are released.
Calibration Curves
The GPI electronics have enhanced calibration features. All
calibration information is visible to the user as words in the
upper part of the display, above the numeric digits.
The calibration curve(s) may be set by the user, and can be
changed or modified at any time using the calibration pro-
cedure described below in the CALIBRATION section. Totals
or flowrate derived from the field calibration are visible when
the field calibration setting is selected.
Selecting a Different Calibration Setting
You can switch between GAL and LTR modes at will without
“corrupting” totalizer contents. For example, the computer
can totalize 10.00 gallons. If the user switches to LTR mode,
the display will immediately change to “37.50” (the same
amount in units of litres). GAL / LTR switching also works in
FLOWRATE mode.
To select a different calibration setting, first press and hold
the CALIBRATE button. Continue to hold it while also briefly
pressing and releasing the DISPLAY button (you may then also
release the CALIBRATE button). The flag indicators in the up-
per area of the display will change to show the newly selected
calibration setting. Calibration settings change in this order:
GAL, LTR, CAL B, CAL C, GAL, etc. While fluid is flowing only
the GAL and LTR selections may be made, however, when NO
fluid flow is occurring, any setting may be selected.
DISPLAY CALIBRATE
ELECTRONIC
DIGITAL
METER
INDUSTRIAL
GRADE
D I S P L A Y 2
Flowrate Mode
The Rate of Flow feature is accessed by briefly pressing and
releasing the DISPLAY button as described above. When this
feature is activated, the word “FLOWRATE” displays to the
left on the bottom line (See Display 3) and the numbers in the
middle of the display reflect the rate of flow (instead of total).
Units are set to update the display every 5 seconds, so the first
reading after flow starts or changes and the last reading after
flow stops or changes will not be correct. This is normal.
D I S P L A Y 3
Propeller
A small propeller displays to indicate liquid is flowing through
the meter.
10
CALIBRATION
The GPI electronics allows for “field” calibration, that is,
user entry of custom calibration parameters. A “single point”
calibration may be used on the GPI GM series, or any other
positive displacement meter, with excellent results. Any pulse
generating device that changes K-factor with varying flowrate
(turbine meter, paddlewheel, etc.) should be calibrated to at
least three points throughout the anticipated flow range for
best accuracy. Up to 15 points can now be entered. The use
of dependable, accurate calibration equipment is highly rec-
ommended for the most accurate results. Additionally, each
curve can be calibrated to a different fluid.
The display includes either a K-factor entry or Dispense/Dis-
play field calibration. To switch from one kind of calibration
to another, refer to the CALIBRATION section.
The K-factor of your meter is usually located on the housing
or nameplate of the meter body. It will also appear on the
Calibration report. Call GPI Customer Service at 888-996-3837
for assistance.
The litre calibration is determined using the gallon calibration
information. Enter the K-factor as pulse per gallon in the GAL
curve. This will correctly calibrate the LTR PRESET curve. You
may still remove the GAL indication on the display using the
computer electronics configuration procedure.

6. Once you release the buttons, The computer is waiting
the display will show the blinking for you to enter a pulse
message “Pr 01” (or Pr 02, Pr 03, rate. Pulse rates are
etc., if you are repeating this entered as pulses per
step). Press either button briefly second. NOTE: If you
and release it. elected to enter a single
K-factor, you must still
enter a pulse rate (any
rate will work, such as
100), otherwise you will
receive an Error message.
7. After you have released one of To enter numbers, use the
the buttons, the display will CALIBRATE button to
change to a numeric representa- change the value of the
tion of the old pulse rate for this digit that is blinking and
point (for example 00047.1) with use the DISPLAY button
the left hand digit blinking. Enter to shift the blink to the
the pulse rate of the new cal next digit.
point.
8. Once the correct number has You have installed the new
been entered, press both but- cal-curve point. You are
tons, and the display will show a ready to end calibration
“KF CAL” message. When you (Step 10) or enter another
release the buttons, the display new calibration point
will change to a blinking “KF 02” (Step 9).
(or greater) message. At this
point the computer is reminding
you that the next value to be
entered will be a K-factor.
9. To enter another calibration point,
go back and repeat Steps 3
through 8.
10. To end calibration, press and After you release the
hold both buttons for about 3 buttons, the computer will
seconds until you see the resume normal operations
“CAL End” message. with the new cal point(s)
active.
11. If you HAVE NOT entered a After you release the but-
K-factor, you can exit calibration tons, the computer will
without changing the cal curve. resume normal operations
If the message KF 01 is showing and the old curve (if you
and you have not entered a have entered one in the
K-factor, hold both buttons for past) is still intact.
about 3 seconds until you see a
“CAL End” message.
11
Your Actions Notes
1. First select a Calibration Curve. Remember that Factory
To do so, hold down CALIBRATE Calibration curves are
while pressing and releasing displayed with the word
DISPLAY until the desired Field PRESET. If LTR is present,
Calibration curve appears (GAL, it will always show PRESET.
CAL B or CAL C message will be
displayed). Release both buttons. Local Mount: The Field
Calibration curves are
shown as CAL B or CAL C
with the PRESET message
absent.
Remote Mount: The Field
Calibration curves are
shown as GAL, CAL B or
CAL C with the PRESET
message absent.
2. To calibrate, press and hold both This step puts the unit in
the CALIBRATE button and the K-factor input mode
DISPLAY button. Hold for about (KF CAL).
3 seconds until the KF CAL mes-
sage appears. Then release both
buttons. Your are now in K-factor
input mode.
3. Once you release the buttons, The computer is waiting
the display will show the blinking for you to make a decision
message KF 01 (or KF 02, KF 03, to either enter a K-factor
etc., if you are repeating this step). or exit calibration. If you
want to exit the calibration
now, go to Step 11.
4. If you want to continue with the It is possible to set up to
calibration, press either button 15 cal-curve points, and
briefly and release it. the KF ## and Pr ##
messages will increment
each time you repeat the
calibration process
(KF 01, Pr 01, KF 02,
Pr 02, KF03, Pr 03, etc.,
up to KF 15 Pr 15).
5. The display will change to a nu- NOTE: K-factors are
meric representation of the current entered as number of
K-factor for this point (for example pulses per unit measure.
00564.0) with the left hand digit When calibrating GAL, use
blinking. Use the CALIBRATE but- only pulses per gallon.
ton to change the numeric value When calibrating CAL B or
and the DISPLAY button to change CAL C, most unit
the digit location, enter the K-fac- measures are acceptable
tor of the new cal point. When you (for example, per litre,
are finished, press both buttons barrel, cubic feet, etc.)
briefly and release.
0000.00
GAL
KF CAL
GAL
KF 01
GAL
00564.0
GAL
CAL E
GAL
A
A
Your Actions Notes
GAL
Pr 01
r
K-FACTOR CALIBRATION PROCEDURES

12
Your Actions Notes
1. Hold down CALIBRATE while Remember that Field
pressing and releasing DISPLAY Calibration curves are not
until the Field Calibration curve preset.
appears (“CAL B” or “CAL C”
message will be displayed).
Release both buttons.
2. To calibrate, press and hold the This step puts the unit
CALIBRATE button. While con- in dispense-display field
tinuing to hold CALIBRATE, also calibration mode
press and hold the DISPLAY (“dd-CAL”).
button. Hold both buttons for
about 3 seconds until you see a
blinking “dd-CAL” message.
Once the “dd-CAL” message
appears, release both buttons.
You are now in field calibration
mode.
3. Once the buttons have been The computer is waiting
released from Step 2, the display for you to make a decision
will show the blinking message to either exit from field
“run 01.” calibration mode or to
begin a dispense run. If
you want to exit the cali-
bration now, go to Step 11.
4. If you want to continue with the
calibration, but have not dispens-
ed any fluid yet, make your final
preparations to your pumping
system, but don’t start pumping
yet.
5. Start your pumping system so When the computer dis-
that fluid flows through the meter. plays a non-blinking “run
The display will stop blinking and 01” message, it is sensing
show the “run 01” message. fluid flow. For the most
Dispense into a container that accurate results, dispense
allows you to judge the amount of at a flowrate which best
fluid pumped. When you have simulates your actual
pumped the desired amount operating conditions.
(for example, 10 gallons), stop the Avoid “dribbling” more
fluid flow quickly. fluid or repeatedly starting
and stopping the flow -
these actions will result in
less accurate calibrations.
Your Actions Notes
6. Once the flow has stopped, briefly When the display shows
press and release both buttons. “0000.00” the computer
At this point the computer display has stopped “watching”
will change to “0000.00” with the for fluid flow and is now
left-hand digit blinking. waiting for you to enter
some numbers.
7. Enter the volume (amount) of fluid
that you dispensed (for example,
if your 10-gallon container is full,
enter “10.00” for gallons or “37.85”
for litres). To enter numbers use
the CALIBRATE button to change
the value of the digit that is blink-
ing and use the DISPLAY button
to shift the “blink” to the next digit.
8. Once the correct number has been You have installed the
entered, briefly press and release new cal-curve point. You
both buttons. The display will now are ready to end calibra-
change to a blinking “run 02” tion (Step 10) or enter
message. another new calibration
point (Step 9).
9. To enter another calibration point, It is possible to set up to
go back and repeat Steps 3 15 cal-curve points, and
through 8. the “run ##” message will
increment each time you
repeat the calibration
process (run 01, run 02,
run 03, etc., up to run 15).
10. To end calibration, press and hold After you release the
both buttons for about 3 seconds buttons, the computer will
until you see the “CAL End” resume normal operations
message. with the new cal point(s)
active.
DISPENSE / DISPLAY
FIELD CALIBRATION PROCEDURES

13
Your Actions Notes
11. If you HAVE NOT dispensed any After you release the
fluid, you can exit calibration with- buttons, the computer will
out changing the cal curve. If the resume normal operation
message “run 01” is showing and and the old curve (if you
you have not dispensed any fluid, have entered one in the
hold both buttons for about past) is still intact.
3 seconds until you see a
“CAL End” message.
Setting 4-20 mA Endpoints
The 4-20 mA endpoint settings are independent from the
display calibration. If you reset the response time you MUST
reset the 4-20 mA endpoints.
All units are shipped with the following items preset:
• 4 mA setpoint = 10 Hz
• 20 mA setpoint = 1000 Hz
• Response time = 0.7 seconds
Any new values you set for these items are automatically
saved when the transmitter is powered down, and automati-
cally restored the next time power is applied.
Procedure
Before you start, the fluid pumping system should be ready
to make two simple calibrating runs, first at the lowest an-
ticipated flowrate, and then the second at the highest antici-
pated flowrate. Position yourself so you can easily operate
the transmitter’s pushbuttons. You should be able to see the
indicator light (the small window beside the “4” button).
Setting the Low (4 mA) Endpoint:
To set 4 mA at zero flow, go to step 3. Otherwise follow
steps 1, 2 and 3:
1. Start the fluid pumping system. Set it for steady flow at
the lowest anticipated rate (or the rate at which you want
a “minimum” indication).
2. Wait while the fluid flow is uninterrupted for at least 10
seconds.
3. While watching the transmitter’s indicating light, press
and hold both its “SET” and “4” buttons. Release them
when the light blinks.
NOTE: The length of time between “button press” and “light
blink” depends on the transmitter response time. The
maximum is 5.2 seconds. If you can’t see the indicator
light (if you’re outdoors in bright light), you can safely just
count to 10 while holding the pushbuttons.
NOTE: After setting the minimum, the loop current should be
registering at or near 4 mA. Don’t worry if it’s not exact, it
will be correct after setting the high (20 mA) endpoint.
Setting the High (20 mA) Endpoint
1. Start the fluid pumping system. Set it for steady flow at
the highest anticipated rate (or the rate at which you want
a “maximum” indication).
2. Wait while the fluid flow is uninterrupted for at least 10
seconds.
NOTE: If you observe the current loop after completing the
procedure, it should be registering at or very near 20
mA (within the resolution specifications for the present
conditions).
3. While watching the transmitter’s indicating light, press
and hold both its “SET” and “20” buttons. Release them
when the light blinks.
NOTE: During the high and low setpoint procedure, if the new
settings are very different from the previous settings, it is
possible to reverse the 4 mA and 20 mA setpoints so that
the 4 mA frequency is higher than the 20 mA frequency.
The situation corrects itself after you complete both
setpoints. If the new settings are close to the previous
settings, you may safely set either the low and high set-
tings independently.
Lockout Feature
This transmitter includes a user selectable lockout feature.
Select the feature after setting the 4 and 20 mA endpoints
during initial use. The lockout feature prevents tampering with
the 4 and 20 mA settings on the transmitter.
Before activating the lockout feature make sure there is no
signal being received by the transmitter. If signal is being
received, deactivate it by one of the following methods:
• Stop the flow through the line that is being recorded.
• Disconnect the output device on the flowmeter.
Locking / Unlocking the Transmitter
Position yourself so you can easily operate the pushbuttons
on the transmitter. You should be able to see the indicator
light.
To lock the transmitter, use the pushbuttons to enter the
following sequence with a brief pause between each button
press: 20 – 20 – 20 – SET. The indicator light will blink twice
to indicate the unit is locked.
To unlock the transmitter, use the pushbuttons to enter the
following sequence with a brief pause between each button
press: 4 – 4 – 4 – SET. The indicator light will blink once to
indicate the unit is unlocked.
Checking the Status of the Lockout Feature
To check the status of the transmitter, use the pushbuttons
to enter the following sequence with a brief pause between
each button press: SET – 4 – 20 – SET. The indicator light
will blink once if unlocked or twice if locked.

14
Optional 0-20 mA Mode
A few current loop systems use 0-20 mA output. The input
signal frequency of “0” produces an output analog signal of
“0” with direct proportionality and no offset.
NOTE: A true loop current of “0” in a loop powered device
like the GPI transmitter is not obtainable. That’s because
the current loop powers the transmitter, and its operat-
ing current is non-zero even at zero frequency input. In
0-20 mode, the GPI Transmitter’s loop current will drop
to as near zero as possible at zero input, in most units
between 1 and 2 mA.
Procedure
1. To enter 0-20 mode, simply press and hold all three push-
buttons simultaneously (4, SET, and 20) at any flowrate.
Continue holding until the indicator light blinks (light will
blink in up to 5 seconds) and release all buttons. This
sets the LOW END calibration point to zero/zero.
2. Set the 20 mA endpoint as described above under 4-20
mA calibration.
3. The special 0-20 mode will remain in effect until a new
4 mA endpoint is established in the usual way.
Auxiliary 0-5 VDC
The 4-20 mA Out with Display is equipped with an auxiliary
voltage output with a range of 0-5 VDC. This signal is capable
of dropping to within a few milliVolts of zero, and thus may
be more suitable for use in the 0-20 mode.
No special equipment is required to use the 0-5V output,
but wiring to customer equipment is different (see Wiring
Diagram 4).
Changing Response Time
The 4-20 mA with Display comes from the factory with a
default 0.7 seconds response time.
If you reset the response time (procedure detailed be-
low) you MUST then reset the 4-20 mA endpoints.
To give good performance with a variety of sensor types,
many frequency-to-analog converters, including the GPI
4-20 mA Out with Display, offer two or more settings for
“response time” (sometimes referred to as “settling time” or
“averaging time”).
• Longer (slower) response times are needed for sensor
types that generate very low frequency outputs (like
GM Series oval gear flowmeters).
• Operating a meter at high flowrates may require a
shorter (faster) response time to achieve the best
transmitter performance.
• Shorter (faster) response times are preferable for sen-
sors that generate higher frequency outputs (GPI turbine
meters, for example).
• Longer (slower) response times are also appropriate in
situations where sensor-output frequency fluctuates or
wobbles substantially.
The GPI 4-20 mA Out with Display offers a choice of five re-
sponse-time settings, selectable by the unit’s pushbuttons.
Procedure
1. Start with the unit unpowered. If the unit is presently
operating, temporarily disable its external power supply.
Be sure to allow at least 30 seconds to elapse with unit
unpowered.
2. Press and hold the “4” button. While holding, watch
the indicator light and power up the 4-20 mA Out with
Display.
3. Shortly after power is applied, the light will blink one or
more times. Count the number of blinks (from 1 to 5 blinks)
and release the button after the blinking has finished.
NOTE: If necessary, repeat steps 1 through 3 to get the
number of blinks corresponding to the response time
you want.
Blinks Response Time
1 blink 0.3 second
2 blinks 0.7 second
3 blinks 1.3 second
4 blinks 2.6 second
5 blinks 5.2 second
In normal operation, the 4-20 mA Out with Display always av-
erages two sequential input readings. The time delay from an
abrupt change in input frequency to a final, stabilized output
reading is always twice that shown in the above table.
Check cable-entry seals periodically. Tighten and/or apply
sealant if needed. This is especially important in environ-
ments containing heavy concentrations of dust, oil mist, or
other residue.
Check all wiring connections occasionally for oxidation or
corrosion. Clean and re-seat if such conditions are noted.
If necessary, check and re-seat any connections that may
have been subjected to strain (during rework or construction,
for example).
MAINTENANCE
WARNING

15
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
A. METER IS NOT 1. Field Calibration not performed properly. Field Calibrate again or select Factory Calibration.
2. Factory Calibration not suitable Perform a Field Calibration according to Calibration Section or
for liquid being measured. select the proper Factory Calibration selection (i.e., gallon or litre).
3. Improper installation of flowmeter. Check for electrical noise, pulsation or swirl in the flow.
4. Flowrates too high or too low. See section on display calibration for flowrates.
B. READOUT FADED 1. Power not connected. Check power supply.
2. Wiring incorrect. Verify connections.
3. Computer defective. Contact the factory.
4. Temperature limits exceeded. Check temperature specifications.
C. NORMAL FLOW- 1. Field Calibration not performed correctly. Field Calibrate again or select Factory Calibration.
2. Computer defective. Contact the factory.
3. Loose wire or mis-wired. Check wiring diagram or cable installation.
4. Sensor not attached to turbine. Check continuity of sensor.
5. Faulty sensor. Contact the factory.
D. LOOP OUTPUT 1. 4 mA / 20 mA setpoints bad or not set. Perform new setpoint procedure for both 4 mA and 20 mA points.
WITHIN NORMAL
RANGE, BUT
INCORRECT
E. LOOP OUTPUT 1. Output response-time setting too short, Select a longer response-time setting.
“BOUNCES” especially for slow input signal.
2. Input connections bad. Check all signal-input connections for intermittent open- or
short-circuits.
F. LOOP-OUTPUT 1. Output response-time setting too long, Select a shorter response-time setting.
STABLE BUT especially for fast input signal.
RESPONSE TIME
TOO SLOW
G. LOOP-OUTPUT OK, 1. 0-5 V output loaded too heavily. Be sure 0-5 V load impedance is at least 1000 ohms (1KΩ).
2. Wiring incorrect. Verify connections.
H. LOOP OUTPUT 1. Loop not supplying power. Be sure loop power supply is present and working, and has
“STUCK”AT ZERO correct polarity.
2. Loop connections bad. Check all loop connections for open- or short-circuits.
3. Transmitter is faulty. Replace transmitter.
I. LOOP OUTPUT 1. 4 mA / 20 mA setpoints bad or Perform new setpoint procedure for both 4 mA and 20 mA
“STUCK” AT LOW not set. points.
VALUE (Between 1
and 4 mA) RE- 2. No input signal. Verify presence of input signal at terminal block.
GARDLESS OF
INPUT SIGNAL 3. Input connections bad. Check all signal input connections for open- or short-circuits.
4. Unit is faulty. Replace unit.
J. LOOP OUTPUT 1. 4 mA / 20 mA setpoints bad or Perform new setpoint procedure for both 4 mA and 20 mA
“STUCK” AT FULL- not set. points.
SCALE (above
20 mA) REGARD- 2. Short-circuit between Loop (–) Check all Loop and LOCAL-COM circuitry for shorts.
LESS OF INPUT and LOCAL-COM circuits.
SIGNAL
3. Incorrect connection of Hall Hall Effect requires dedicated power supply.
Effect device.
TROUBLESHOOTING
OR BLANK
ACCURATE
RATE BUT METER
DOES NOT COUNT
(Meter comes on
when DISPLAY
button pushed)
ERRATICALLY
(is unstable)
BUT 0-5 V OUTPUT
DOESN’T WORK
(No reading at all,
regardless of input
signal.)

16
DIMENSION DRAWINGS

17
ILLUSTRATED PARTS DRAWING
Item No.
No. Part No. Description Req’d.
1 120512-01 Switch Keypad Kit ............................................................1
2 120048-01 Gasket .............................................................................. 1
3 12051803 Computer Kit (Hours) ........................................................ 1
12051804 Computer Kit (Minutes) .....................................................1
4 120043-01 PCB Assembly ..................................................................1
5 904005-63 Screw, 4-40 x 3/16 in. .......................................................2
6 901002-82 O-Ring ..............................................................................1
7 120509-01 Adapter Kit - Remote Display & Local (GM001, .................
GM002 & GM003) ........................................................ 1
120509-02 Adapter Kit - Local (GM005 & GM007) .............................1
120509-03 Adapter Kit - Local (GM010, GM015 & GM020) ...............1
12051701 Adapter Kit (GX510) .......................................................... 1
8 904006-94 Screw, Tapping, GM001, GM002 and GM003 ..................2
9 120058-01 Bracket .............................................................................1
10 904005-13 Screw, 6-32 x 1/2 in. .........................................................4
Item No.
No. Part No. Description Req’d.
11 904002-44 Screw, 8-32 x 5/16 in. .......................................................2
12 125066-20 Cable, 20 ft. ......................................................................1
125066-3 Cable, 100 ft. .................................................................... 1
13 906005-47 Threaded Plug .................................................................. *
14 902005-9 Strain Relief ...................................................................... *
15 901002-87 O-Ring .............................................................................. *
16 904006-95 Screw, Hex Socket M5-0.8 x 12:
For GM005 and GM007 ...............................................2
For GM010, GM015 and GM020 ................................. 4
17 120054-01 Main Circuit Assembly ...................................................... 1
18 904005-28 Sealing Seal, 1/4-20 x 5/8 in. ...........................................4
19 904005-74 Screw, Fillister HD, #6-32 x 3/8", CR ...............................2
20 906005-48 Seal for Threaded (Item #13) Plug .................................... *
21 90400811 Washer, Flat, #6 (Type B), Narrow, SS .............................. 2
* Varies by model.
1
2
3
4
5
6
7
8
9
10
11
13
12
14
15
16
18
19
17
20
21

18
SPECIFICATIONS – LOCAL MODEL
Applications:
Use for indoor or outdoor applications where occasional
moisture is common.
Materials:
Acetal, Amorphous Nylon, Silicone Rubber, Polyester
(decals), Viton (gasket & seals), Stainless Steel (fasteners)
Power Source:
2-wire, loop powered*. 8.5 VDC to 35 VDC loop voltage
required for correct operation.
Outputs**:
Analog Primary: 4-20 mA current loop. With loop voltage
maintained within specified limits, will maintain advertised
linearity over 4 mA to 20 mA range, with good linearity in
over-range conditions to about 1.5 mA and 25 mA.
Analog Auxiliary: 0 to 5 VDC. Relationship to primary cur-
rent output: V(volts) = l (ma) ÷ 5 . Will maintain advertised
linearity over 0.8 V to 4.0 V range, with good linearity in
over-range conditions to about 0.1 V and 4.9 V.
Recommended minimum driven impedance = 10K Ohms.
Digital (Pulse-Out): Open Collector, square wave. Will
switch up to 60 V and up to 200 mA. Closed circuit volt-
age drop typically 0.1 V; guaranteed less than 0.5 V at any
current up to 200 mA.
Configuration:
2-Totals (1 cumulative and 1 batch), Rate, 2 Cals
(Factory calibration in gallons or litres; 2 field calibrations)
Input Signal:
Hall Effect, Reed Switch, NPN, Open Collector or
Sine Wave
Time Base:
Hours or minutes
Unit of Measure:
U.S. gallons or litres
Accuracy / Performance:
Possible conversion error, in addition to any inaccuracy of
coupled flowmeter, as follows:
Max. Conversion Error: (nonlinearity plus span, any input,
loop current output, 0°C to 70°C, loop voltage supply 12
VDC to 24 VDC) 0.5% of span plus possible resolution
uncertainty.
Max. Conversion Resolution Uncertainty: (Loop current
output, when properly calibrated) Larger of 0.1 mA or
[20 mA / (10 x ( f20–f4)]. Where f20 = frequency at 20 mA,
f4 = frequency at 4 mA.
Speed of Response: After step change in input frequency,
loop output guaranteed stable within 3 x accumulating time
(Accumulating time user selectable from 0.3 sec, 0.7 sec,
1.3 sec, 2.6 sec, 5.2 sec).
Frequency Range:
0.25 to 1,000 hertz
Batch Total:
Up to 999,999
Cumulative Total:
Up to 999,999
Temperature:
Ambient Temperature: +32°F to 140°F (0°C to 60°C)
Cable:
No cable provided
Mechanical Connections:
Display is mounted directly to flow meter body.
Electrical Connections:
GX500 - Two strain relief ports
GX510 - One strain relief port: one threaded plug
G2 Series - Two strain relief ports
GM Local Models - Two strain relief ports
GM 1/2 in. and Larger - One strain relief port: one
threaded plug
Shipping Weight:
1.1 lb. (.5 kg)
* Models utilizing Reed Switch pickup are completely loop powered, and
do not require any additional power supply. Note, however, that models
utilizing Hall Effect signal pickup require an additional independent, iso-
lated DC power supply for powering the Hall Effect device.
** If you want to use the 4-20 mA output and one or both of the other
outputs at the same time, you must provide electrical isolation between
the current loop and all other circuit elements. Failure to do so will result in
incorrect 4-20 mA signal conversion, and possible damage to the unit.
SPECIFICATIONS – REMOTE MODEL
Applications:
Use for indoor or outdoor applications where occasional
moisture is common.
Materials:
Acetal, Amorphous Nylon, Silicone Rubber, Polyester
(decals), Viton (gasket & seals), Stainless Steel (fasteners),
PVC (cable jacket)
Power Source:
2-wire, loop powered*. 8.5 VDC to 35 VDC loop voltage
required for correct operation.
Outputs**:
Analog Primary: 4-20 mA current loop. (This is also the
power supply input for the module.) With loop voltage
maintained within specified limits, will maintain advertised
linearity over 4 mA to 20 mA range, with good linearity
in over-range conditions to about 1.5 mA and 25 mA.
Absolute maximum current limit under fault conditions
approximately 35 mA.
Analog Auxiliary: 0 to 5 VDC. Relationship to primary cur-
rent output: V(volts) = l (ma) ÷ 5 . Will maintain advertised
linearity over 0.8 V to 4.0 V range, with good linearity in
over-range conditions to about 0.1 V and 4.9 V.
Recommended minimum driven impedance = 10K Ohms.
Digital (Pulse Out): Open Collector, square wave. Will
switch up to 60 V and up to 200 mA. Closed circuit voltage
drop typically 0.1 V; guaranteed less than 0.5 V at any in
range current.
Configuration:
2-Totals (1 cumulative and 1 batch), Rate, 2 Cals
(Factory calibration in gallons or litres; 2 field calibrations),
K-factor to match published K-factor for each size meter.

19
* To power some low power pickup/display devices, such as a GPI
“EDM” module, a loop powered GX500 can supply 5 VDC at up to ap-
proximately 2.5 mA without degrading conversion accuracy. However, “ac-
tive” pickup devices or conditioners (i.e., Hall Effect or R-F) usually require
more current. If such a device is used, or if you use the optically isolated
inputs, you must provide an independent, isolated DC power supply to
operate the pickup circuitry.
** If you want to use the 4-20 mA output and one or both of the other
outputs at the same time, you must provide electrical isolation between
the current loop and all other circuit elements. Failure to do so will result in
incorrect 4-20 mA signal conversion, and possible damage to the unit.
Time Base:
Hours or minutes
Unit of Measure:
U.S. gallons or litres
Frequency Limits for Correct Operation:
Display and
Input Type Analog Conversion Digital Output
LLC (sine): approx. 11-1000 Hz approx. 0-1000 Hz
HLLF: 0.25-150 Hz 0-150 Hz
HLHF: 0.25-1200 Hz 0-1200 Hz
Optically Isolated HLLF: same as standard HLLF
Optically Isolated HLHF: same as standard HLHF
Accuracy / Performance:
Max. Conversion Error: (nonlinearity plus span, any input,
loop current output, 0°C to 70°C, loop voltage supply 12
VDC to 24 VDC) 0.5% of span plus possible resolution
uncertainty. Coupled flowmeter may add additional error.
Max. Conversion Resolution Uncertainty: (Loop current
output, when properly calibrated) Larger of 0.1 mA or
[20 mA / (10 x ( f20–f4)]. Where f20 = frequency at 20 mA,
f4 = frequency at 4 mA.
Speed of Response: After step change in input frequency,
loop output guaranteed stable within 3 x accumulating time
(Accumulating time user selectable from 0.3 sec, 0.7 sec,
1.3 sec, 2.6 sec, 5.2 sec).
Batch Total:
Up to 999,999
Cumulative Total:
Up to 999,999
Ambient Temperature:
+32°F to +140°F (0°C to +60°C)
Cable:
20 feet, 3-conductor (red, black & white), tinned drain wire,
22 AWG, PVC jacket .212 dia., (Reference Belden 9363 or
equivalent cable)
Mechanical Connections:
Wall or pipe mountable with standard U-bolts
Electrical Connections:
GX500 - Two strain relief ports
GX510 - One strain relief port: one threaded plug
G2 Series - Two strain relief ports
GM Local Models - Two strain relief ports
GM 1/2 in. and Larger - One strain relief port: one
threaded plug
Shipping Weight:
1.1 lb. (.5 kg)
SERVICE
For warranty consideration, parts, or other service informa-
tion, please contact your local distributor. If you need further
assistance, contact the GPI Customer Service Department
in Wichita, Kansas, Monday-Friday, 8:00 a.m. to 5:00 p.m.
Central time.
Tel: [phone]
Fax: [phone]
Toll free: 1-888-996-3837
To obtain prompt, efficient service, always be prepared with
the manufacturing date code, found behind the coverplate.
For warranty work, always be prepared with your original sales
slip or other evidence of purchase date.
Please contact GPI before returning any part. It may be
possible to diagnose the trouble and find a solution with a
telephone call. GPI can also inform you of any special require-
ments you will need to follow for shipping.
The Waste Electrical and Electronic Equipment (WEEE) directive
(2002/96/EC) was approved by the European Parliament
and the Council of the European Union in 2003. This symbol
indicates that this product contains electrical and electronic
equipment that may include batteries, printed circuit boards,
liquid crystal displays or other components that may be
subject to local disposal regulations at your location. Please
understand those regulations and dispose of this product in
a responsible manner.
WEEE DIRECTIVE