GF Signet 8850-3 User manual

1Signet 8250-2 Level Transmitter
CAUTION!
• Remove power to unit before wiring
input and output connections.
• Follow instructions carefully to avoid
personal injury.
Signet 8250-2 Level Transmitter English
Contents
1. Description
2. Specifications
3. Panel installation
4. Electrical Connections
5. System configuration
6. View menu
Signet Level
Transmitter
Level
+10.00 ft
Relay 1 Relay 2
ENTER
1. Description
• ProcessPro transmitters are available in two styles: panel mount and field mount. The panel mount is supplied with the necessary
hardware to install the transmitter. This manual includes complete panel mounting instructions.
• Field mounting requires one of two separate mounting kits. The 3-8052 integral kit joins sensor and instrument together into a
single package. The 3-8050 Universal kit enables the transmitter to be installed virtually anywhere.
• Detailed instructions for integral mounting or other field installation options are included with the 3-8052 Integral kit or the 3-8050
Universal kit.
General
Compatible Sensors: Signet 2450 Pressure sensor
Enclosure: NEMA 4X/IP65 front
Materials:
• Case: PBT
• Panel case gasket: Neoprene
• Window: Polyurethane-coated polycarbonate
• Keypad: Silicone rubber
Weight: Approx. 325 g (12 oz.)
Display:
• Alphanumeric 2 x 16 LCD
• Sealed 4-button keypad
• Display update rate: 1 second
• Contrast: User selected, 5 levels
Environmental
• Operating temperature: -10 to 70°C (14 to 158°F)
• Storage temperature: -15 to 80°C (5 to 176°F)
• Relative humidity: 0 to 95%, non-condensing
• Maximum altitude: 2000 m (6562 ft)
Electrical
Power supply: 12-24 VDC ±10% regulated, 250 mA max current
Sensor power: 5 VDC ±1% @ 25ºC, regulated
2-wire system: 1.5 mA maximum current
4-wire system: 20 mA maximum current
Current output:
• 4 to 20 mA, isolated, fully adjustable and reversible
• Max loop impedance: 50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V
• Update rate: 300 ms
• Output accuracy: ±0.03 mA
Relay outputs:
* 2 sets mechanical SPDT contacts standard with all units.
• Software supports 2 additional relays via optional external
relay module
• Maximum voltage rating:
5 A @ 30 VDC, or 5 A @ 250 VAC, resistive load
• Programmable for High or Low setpoint or for Window range,
with adjustable hysteresis
• May be disabled if not used
• Time delay: programmable from 0 to 6400 s
Standards and Approvals:
• CSA, CE, UL listed
• Immunity: EN50082-2
• Emissions: EN55011
• Safety: EN61010
• Manufactured under ISO 9001 and ISO 14001
SIDE VIEW
Field Mount with
8052 Integral kit
92 mm
(3.6 in.
)
97 mm
(3.8 in.)
56 mm
(2.2 in.)
41 mm
(1.6 in.
)
Optional
Rear
Cover
FRONT VIEW
96 mm
(3.8 in.)
96 mm
(3.8 in.)
Field &
Panel Mount
SIDE VIEW SIDE VIEW
Field Mount with
8050 Universal kit
107 mm
(4.2 in.)
96 mm
(3.8 in.)
106 mm
(4.18 in.)
82 mm
(3.23 in.)
Panel Mount with
NEMA 4X rear cover
2. Specifications
Dimensions
7. Editing procedure
8. Calibrate menu
9. Options menu
10. Troubleshooting
3-8250.090-2 Rev. E 11/05 English
3-8250.090-2

2 Signet 8250-2 Level Transmitter
Terminals 5-10: Relay Outputs
2 sets mechanical SPDT contacts programmable as:
• High or Low setpoint with adjustable hysteresis
• "Window" limits with adjustable hysteresis
• Time delay up to 6400 seconds.
• May be disabled (Off) if not used.
• Auxiliary power (terminals 1-2) MUST be connected for relay operation
Terminals 3 and 4: Loop Power
12-24 VDC ±10% system power and current loop output.
Max. loop impedance:
50Ωmax. @ 12 V
325Ωmax. @ 18 V
600Ω max. @ 24 V
Terminals 1 and 2: AUXILIARY power
Required for all systems that include relay
operation.
System Power
Loop -
System Power
Loop +
AUX
Power -
AUX
Power +
4
3
2
1
Relay 2
(NO)
Relay 2
(COM)
Relay 2
(NC)
Relay 1
(NO)
Relay 1
(COM)
Relay 1
(NC)
10
9
8
7
6
5
Gnd
I/O
V+
13
12
11
quick-clips
gasket pane
l
terminals
mounting
bracket
latch
Output -
Output +
System Pwr
Loop -
System Pwr
Loop +
2
14
3
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Sensr V+
(BLACK)
7
6
5
Panel Mount
Installation Detail
3. Panel Installation
1. The panel mount transmitter is designed for installation
using a 1/4 DIN Punch. For manual panel cutout, an
adhesive template is provided as an installation guide.
The cutout must be 92 mm x 92 mm. Recommended
clearance on all sides between instruments is 25 mm/1 in.
2. Slide the instrument into the cutout from the front of the
panel.
3. Slide the mounting bracket over back of instrument until
quick-clips snap into latches on side of instrument.
4. To remove, secure instrument temporarily with tape from
front or grip from rear of instrument. DO NOT RELEASE.
Press quick-clips outward and remove.
2
1
Caution: Fully open terminal jaws
before removing wire to avoid
damage to connector.
4. Electrical Connections
Wiring Procedure
1. Remove 0.5 - 0.625 in. (13-16 mm) of insulation from wire end.
2. Press the orange terminal lever downward with a small screwdriver to open
terminal jaws.
3. Insert wire into terminal until it bottoms out.
4. Release orange terminal lever to secure wire in place. Gently pull on each
wire to ensure a good connection.
Wiring Removal Procedure
1. Press the orange terminal lever downward with a small screwdriver to open
terminal jaws.
2. When fully open, remove wire from terminal.
Terminals 11-13: Digital (S3L) input/output
The 2450 sensor and External Relay Module
connect here.

3Signet 8250-2 Level Transmitter
4.2 Serial Data Connections
• The Input/Output terminals on the 8250 carry S3L™ serial data from the 2450 Pressure sensor and from the External Relay Module.
• You MUST reset sensor configuration (see Calibrate menu) for all new systems and after connecting a new sensor or relay module
to the I/O terminals.
• Do not route sensor or output cables in conduit containing AC power wiring. Electrical noise may interfere with sensor signal.
• Routing cable in grounded metal conduit will help prevent electrical noise and mechanical damage.
• Seal cable entry points to prevent moisture damage.
• Only one wire should be inserted into a terminal. Splice double wires outside the terminal.
• The TOTAL cable length from I/O devices to the transmitter must not exceed 122 m (400 ft.).
• For best performance, ground the sensor SHIELD wire to a local earth ground at a point near the sensor.
• Consult the sensor manual for additional wiring information.
4.1 System Power/Loop Connections
Stand-alone application, no current loop used
8250-2
Terminals
4
3
2
1
Sys. Pwr. (Loop -)
Sys. Pwr. (Loop +)
AUX Power -
AUX Power +
Power Supply
12 - 24 VDC
Power
Supply
Power
Supply
-
+
Connection to a PLC/Recorder, separate supply
PLC or Recorder
Channel 1
4-20 mA in
Channel 1
4-20 mA in
12 - 24 VDC
Power Supply
Power Supply
-
+
8250-2
Terminals
4
3
2
1
Sys. Pwr. (Loop -)
Sys. Pwr. (Loop +)
AUX Power -
AUX Power +
-
+
Connection to a PLC with built-in power supply
PLC Terminals
Power Supply
Ground
Power
Supply
Channel 1
4-20 mA in
Channel 1
4-20 mA in
Internal PLC
Connection
-
+
-
8250-2
Terminals
Sys. Pwr. (Loop -)
Sys. Pwr. (Loop +)
AUX Power -
AUX Power +
4
3
2
1
Two transmitters connected to PLC/Recorder
with separate power supply
PLC or Recorder
Channel 1
4-20 mA in
Channel 1
4-20 mA in
Channel 2
4-20 mA in
Channel 2
4-20 mA in
12 - 24 VDC
Power Supply
Power Supply
-
+
8250-2
Terminals
4
3
2
1
Sys. Pwr. (Loop -)
Sys. Pwr. (Loop +)
AUX Power -
AUX Power +
-
+
-
+
4
3
2
1
Sys. Pwr. (Loop -)
Sys. Pwr. (Loop +)
AUX Power -
AUX Power +
Note:
AUXILIARY power is required to operate the relays.
2450 Pressure Sensor
8250 I/O
Terminals
Shield (Gnd)
Red (I/O)
Black (V+)
13
12
11
The TOTAL cable length connected to
the 8250 input/output terminals must
not exceed 122 m (400 ft.)
The External Relay Module
provides terminals to connect
the sensor in series.
8059 External Relay Module

4 Signet 8250-2 Level Transmitter
Zero reference point (Z):
Definition:
The point in the vessel where you want the 8250 to display
zero (0 ft., 0 gal. etc).
• If Z is located below the fluid surface, the 8250 will display
a positive level measurement.
• If Z is located above the fluid surface, the 8250 will display
a negative level measurement.
Sensor Location point (SLoc):
Definition:
The point on the level sensor where the measurement is
taken.
• The 2450 Pressure sensor measures from the centerline of
the diaphragm.
Offset (O):
Definition:
The distance from the zero reference point (Z) to the sensor
location point (Sloc).
• Enter a positive value in the Calibrate menu if the sensor is
located above Z (zero reference point).
• Enter a negative value in the Calibrate menu if the sensor
is located below Z (zero reference point).
• Enter 0 in the Calibrate menu if the sensor is located at Z
(zero reference point).
Level (L):
Definition:
• The distance from Z (zero reference point) to surface of
fluid (displayed as "Level" by transmitter.
L > 0
O(ffset) > 0
Z (ero)
S
Loc
L > 0
O(ffset) < 0
Z (ero)
S
Loc
L<0
S
Loc
O(ffset) < 0
Z (ero)
2450 Pressure Sensor Location and Offset
Z
Z
For horizontal cylinders only,
the zero reference point MUST
be the lowest point in the
vessel.
For most vessels, the zero
reference point may be
designated as any height
in the vessel.
5. System Configuration
The 8250 Level Transmitter must be programmed using the following system configuration procedure.
1. Determine where you want the level measurement to start. This is the Zero reference point (Z).
Review the diagram to help select the best option.
2. Determine where you will mount the sensor. This is SLoc.
Consult the Sensor manual for information regarding the best location for the sensor.
3. Measure the distance between Z and SLoc. This is O(ffset).
4. Enter the Offset into the Calibrate menu.

5Signet 8250-2 Level Transmitter
Custom point #10 3000 gal.
Custom point #1 0 gal.
Custom point #2 45 gal.
Custom point #3 118 gal.
Custom point #4 160 gal.
Custom point #5 250 gal.
Custom point #9 1300 gal.
Custom point #6 380 gal.
Custom point #7 700 gal.
Custom point #8 1000 gal.
5.1 Level and Volume conversion in custom shaped vessels
If you select Custom Shape in the Options menu, you can define
from 2 to 10 Custom Points to establish the relationship of level to
volume in the vessel.
• Select Manual level Measurement mode to edit both level and
volume data (dry configuration).
• Select Automatic level Measurement mode to accept the
sensor measurement of the Level, while you assign a
volumetric value to each custom point (wet configuration).
• Enter from 3 to 10 custom points to link level and volume
values.
• The first custom point must be the lowest fluid level in the
vessel.
• Each successive point must be greater than the preceding
point.
• The last point must be equal to or greater than the highest
fluid level in the vessel.
• A custom point should be located at all transition points in
the vessel shape (for example, at custom point #9, where the
shape changes from a cylinder to a cone).
• The more complex sections should be defined with more
points. Notice that the conical section of the illustration has
been defined by custom points 1 through 9.
• Simpler sections require fewer defining points. Note that the
cylinder requires only custom points 9 and 10.
Level, volume and mass calculations performed by the 8250
include:
Pressure to level conversion:
Level = P ÷ (SG • D(water))
where P = Pressure
SG = Specific Gravity of fluid
D
(water) = Density of water
With pressure in psi: Level (meters) = (0.703069 • P / SG)
with pressure in bar: Level (meters) = 1.019715 • P / SG)
Mass conversion
m = D(water) • SG • V
where m = mass of fluid
D
(water) = Density of water = 1000 kg/m3
SG = Specific Gravity of fluid
V = Volume of fluid (m3)
m (kg) = 1000 • SG • V
A
r
h
Length
5.2 Reference
Volume calculations
Vertical cylinder: V = π• d2 • h/4
where d = diameter of cylinder
h = height of fluid
Rectangular vessel: V = w • l • h
where w = width
l = length
Horizontal cylinder: V = A • L
where A = area of segment
L = Length of vessel
Custom vessel:
The 8250 performs linear interpolation between adjacent points.

6 Signet 8250-2 Level Transmitter
Loop Output:
19.00 mA
Relay A: On
Relay B: Off
No Relay Module
Detected
Last Cal:
09-03-04
Displays the Level value.
Permanent display when "Level" is the display selection in OPTIONS menu.
Displays the Volume value.
Permanent display when "Volume" is the display selection in OPTIONS menu.
Displays the Level and Volume simultaneously.
Permanent display when "Both" is the display selection in OPTIONS menu.
5.3 Relay Operation
Relay outputs can be used as switches that respond when the
process variables move above or below setpoints, or when the
process variables move outside of a window.
• The relays may be turned Off if not in use.
• Response can be delayed up to 6400 s ( see Calibrate menu).
Low:
Relay is energized when process variable is less than the setpoint.
The relay relaxes when the process variable moves above the
setpoint plus the hysteresis value.
High:
Relay is energized when process variable is greater than the
setpoint. The relay relaxes when the process variable moves
below the setpoint plus the hysteresis value.
Window
Relay is energized when the process variable moves above or
below a fixed window of values. The relay relaxes when the
process variable moves inside the window by more than the
hysteresis value.
Note:
Relays will operate in reverse if miswired. Observe relay logic
appropriate to the application.
6. VIEW menu
• During normal operation, the ProcessPro displays the VIEW menu.
• To select a display, press the UP or DOWN arrow keys. The display selections scroll in a continuous loop.
• Changing the display selection does not interrupt system operations.
• No keycode is necessary to change display selection.
• Output settings cannot be edited from the VIEW menu.
• When using the CALIBRATE or OPTIONS menus, the ProcessPro will return to the VIEW menu if no key
is pressed for 10 minutes.
View Menu
Display Description
The following displays are temporary. The permanent display will return after ten minutes.
The following displays are permanent. They will remain as selected until you change them.
Level
+ 10.00 ft
Volume
+30.00 gal
LVL +10.00 ft
VOL +300.00 gal
Displays the Loop (4-20 mA) output.
Displays the status of Relays A and B.
Appears only when external relay module is detected.
Displayed if the relay module is not detected at Sensor Configuration (see
calibrate menu).
Displays the date for scheduled maintenance or date of last calibration.
Signet Level
Transmitter
Level
+10.00 ft
Relay 1 Relay 2
ENTER
Hysteresis
Time
Low Setpoint
Process
Hysteresis
Time
High Setpoint
Process
High Limit Hysteresis
Hysteresis
Window
Time
Low Limit
Process
Relay energized
Rela
y
relaxed

7Signet 8250-2 Level Transmitter
Relay 1 Setpnt:
+ 1 0.000 ft
Relay 1 Setpnt:
+ 0 0.000 ft
ENTER
Relay 1 Setpnt:
+
0 0 .000 ft
Relay 1 Setpnt:
+09.000 ft
Relay 1 Setpnt:
Saving
Relay 1 Setpnt:
+
9.0000 ft >
Notes on Steps 5 and 6:
• All output functions remain active during editing.
• Only the flashing element can be edited.
• RIGHT ARROW key advances the flashing element in a continuous loop.
• Edited value is effective immediately after pressing ENTER key.
• If no key is pressed for 10 minutes unit will restore the last saved value and return to step 3.
• Step 6 (pressing ENTER key) always returns you to Step 3.
• Repeat steps 3-6 until all editing is completed.
Notes on Step 2:
If no key is pressed for 5 minutes while display is showing "Enter
Key Code", the display will return to the VIEW menu.
Notes on Steps 3 and 4:
• Refer to pages 8-10 for complete listing of menu items and their use.
• From the Step 3 display, pressing the UP and DOWN keys simultaneously will
return the display to the VIEW menu.
• If no key is pressed for 10 minutes, display will also return to the VIEW menu.
7. ProcessPro Editing Procedure:
Step 1. Press and hold ENTER key:
• 2 seconds to select the CALIBRATE menu
• 5 seconds to select the OPTIONS menu.
Step 2. The Key Code is UP-UP-UP-DOWN keys in sequence.
• After entering the Key Code, the display will show the first item in the selected menu.
Step 3. Scroll menu with UP or DOWN arrow keys.
Step 4. Press RIGHT ARROW key to select menu item to be edited.
• The first display element will begin flashing.
Step 5. Press UP or DOWN keys to edit the flashing element.
• RIGHT ARROW key advances the flashing element.
Step 6. Press ENTER key to save the new setting and return to Step 3.
OPTIONS
CALIBRATE
VIEW
2s 5s
Press &
hold for
access:
ENTER
Step 5
Step 6
Notes on Step 1:
• The View Menu is normally displayed.
• The CALIBRATE and OPTIONS menus require a KEY CODE.
Step 4
First item in CALI-
BRATE menu
Step 3
Step 3: Finished Editing?
Press the UP and DOWN keys simultaneously after
saving the last setting to return to normal operation.
Press the UP and DOWN keys simultaneously
while any element is flashing. This will recall the
last saved value of the item being edited and
return you to Step 3.
Step 5: Made an Error?
CALIBRATE: ----
Enter Key Code
CALIBRATE: *---
Enter Key Code
CALIBRATE: **--
Enter Key Code
CALIBRATE: ***-
Enter Key Code
ft >
LVL Units:
ft >
LVL Units:
+10.000 ft >
Relay 1 Setpnt:

8 Signet 8250-2 Level Transmitter
Select the units of measure: ft, in, m,cm.
Yes: Level will be displayed as a percentage of the full scale.
No: Level will be displayed as engineering units.
If "Show LVL in %" is YES, enter the full scale value. The units are the same as LVL Units
Enter the distance from sensor location to the Zero reference point in the vessel.
Enter +if the sensor is located above the Zero reference point.
Enter -if the sensor is located below the Zero reference point.
Select the units of measure for Volume: gal, ft3, in3, m3, kg, lb, or lit (liters)
Yes: Volume will be displayed as a percentage of the full scale.
No: Volume will be displayed as engineering units.
If "Show VOL in %" is YES, enter the full scale value. The units are the same as VOL Units
Enter the specific gravity of the fluid. Factory setting is 1 (water)
This setting is required only if the level measurement is made by a pressure sensor
(Signet 2450), or if volume units are selected ( kg or lb ) .
Single-point calibration for Level.
Yes: Reset Level to original factory calibration. ("Set LVL" entry is erased.)
No: Return to menu, do not reset Level.
LVL Units:
ft >
Show LVL in %:
No >
LVL 100%:
+0.0000 ft >
Sensor Offset:
+0.0000 ft >
VOL Units:
gal >
Show VOL in %:
No >
VOL 100%:
+0.0000 gal >
Spec Gravity:
1.0000 >
Set LVL:
>
Reset LVL
to Factory Cal: >
8. Calibrate Menu
Display
(Factory settings shown) Description

9Signet 8250-2 Level Transmitter
Select the source for the 4-20 mA Loop: LVL or VOL.
Select the minimum and maximum values for the 4-20 mA Current loop output.
Select the mode of operation for Relay Output: Low, High, or Window.
The relay may be disabled (Off) if not in use.
Select the source for Relay: LVL or VOL.
If Relay is in Low or High mode, the relay will be activated when the level or volume reaches
this value.
If Relay is in Window mode, the relay will be activated when the level or volume is less than
(low limit) or greater than (hig limit) the range. You must enter the low limit into the first field,
and the high limit into the second field.
Relay will be deactivated at Setpoint ± Hysteresis.
The Hysteresis value is in Level units or % of full scale.
Set up to 6400 seconds delay time for relay response.
Relay will be activated only if the source value exceeds the setpoint for this time period.
Use this function during initial startup of a new system, and whenever a new sensor is added
to the system. It enables the 8250 to scan the sensor input terminals and determine the type
and specific serial numbers of the sensors connected to the sensor input.
Use this “note pad” to record important dates, such as annual recertification or scheduled
maintenance.
Loop Source:
LVL >
Loop Rng: ft
+0.0000 → +10.000 >
Relay 1 Mode:
Off >
Relay 1 Source:
LVL >
Relay 1 Setpnt:
+0.0000 ft >
Relay 1 Rng: ft
+0.0000 → +10.000 >
Relay 1 Hys:
0.00 ft >
Relay 1 Delay:
0.0 secs >
Reset Sensor
Configuration: >
Last Cal:
09-03-04 >
8. Calibrate Menu (continued)
Display
(Factory settings shown) Description
• Relay settings will repeat for Relay #2 and for External relays A and B.
• A and B Relays require the optional External Relay Module (model number 3-8059)
The Relay settings below will not appear if the Relay mode is OFF

10 Signet 8250-2 Level Transmitter
Select the shape of the vessel where Sensor is located:
Vert Cylinder, Horiz Cylinder, Rectangular or Custom
If Vert Cylinder or Horiz Cylinder is selected:
Set the diameter of the cylinder
The unit of measure is set by "LVL Units" in Calibrate menu.
If Horizontal Cylinder or Rectangular shape is selected:
Set the length of the vessel. The unit of measure is set by "LVL Units" in Calibrate menu.
If Rectangular shape is selected:
Set the width of the vessel. The unit of measure is set by "LVL Units" in Calibrate menu.
If Custom shape is selected, enter the number of manual calibration points to be
entered. Minimum is 3 points, maximum is 10 points.
If Custom shape is selected: select Manual or Automatic level measurement.
Manual allows you to Edit both the Level measurement and the Volume measurement.
Automatic allows you to Edit only the Volume measurement (while displaying Level value)
Set the Volume (and Level if manual measurement is selected) at each custom point in
your vessel.
Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher.
In general, select lower contrast if the display is in warmer ambient surroundings.
Select Level, Volume or Both.
This setting will determine the permanent display selection.
Off provides near-instantaneous response to measurement changes.
Low (4 s averaging) Medium (8 s averaging) or High (32 s averaging) will stabilize the
system if your process experiences frequent fluctuations or surface turbulence.
Set the decimal to the best resolution for your application. The display will automatically
scale up to this restriction. Select *****., ****.*, ***.** or **.***
Adjust the minimum and maximum current output. The display value represents the
precise current output. Adjustment limits:
• The 4.00 mA output can be adjusted from 3.80 mA minimum to 5.00 mA maximum
• The 20.00 mA output can be adjusted from 19.00 mA minimum to 21.00 mA maximum
• Use these adjustments to match the system output to any external device.
Press UP and DOWN keys to manually order any output current value from 3.6 mA to
21.00 mA to test the output loop.
Press UP and DOWN keys to manually toggle Relay #1 Off and On.
Contrast:
3 >
Display Option:
Level >
Average:
Off >
Decimal:
***.** >
Loop Adjust:
4.00 mA >
Loop Adjust:
20.00 mA >
Test Loop:
>
Test Relay 1
>
• Relay settings will repeat for Relay #2 and for external Relays A and B.
VOL Shape:
Vert Cylinder >
VOL Diameter:
0.0000 ft >
VOL Length:
0.0000 ft >
VOL Width:
0.0000 ft >
Number of Custom
Points: 10 >
LVL Measurement:
Manual >
P01: +0.0000 ft
V: +0.0000 gal >
9. Options Menu
Display
(Factory settings shown) Description
• The following entries are used by the 8250 to convert the level into volumetric and mass measurements. The accuracy of
the entries entered will determine the accuracy of the volumetric and mass calculation. Refer to section 5 for additional
information.