PIE PIECAL 334Plus User manual

Page 1
•EASY TO USE
With the PIECAL 334Plus you can check, calibrate and measure all your current signal
instruments in a 4 to 20 milliamp DC loop. It can be used at any access point in your loop.
Source & Read 0.000 to 24.000 mA, Simulate a 2 Wire Transmitter or use the PIECAL 334Plus
to simultaneously power your 2 Wire Transmitter and measure its output.
•EASY TO READ
Turn on the backlight to easily read the display in
dark areas of the plant.
•TROUBLESHOOT LOOP PROBLEMS
Quickly diagnose ground fault and current
leakage with the patented loop diagnostic
technology (US Patent# 7,248,058).
• SOURCE MILLIAMPS
Calibrate recorders, digital indicators, stroke
valves or any instruments that get their input
from a 4 to 20 mA loop. Easily set any value
quickly to within 0.001 mA with the adjustable
digital potentiometer “DIAL” or use preset 4.000
mA (0.00%) and 20.000 mA (100.00%)
EZ-CHECK™ settings.
• AUTOMATIC OUTPUT STEPPING & RAMPING
Press & hold the dial to automatically step from 4
to 20 in 2, 3 or 5 steps or choose a continuous
ramp.
• CALIBRATE USING LOOP POWER
Check loop wiring and receivers by using the
PIECAL 334Plus in place of a 2 Wire transmitter.
The PIECAL 334Plus uses any loop power from
2 to 100V DC.
• READ LOOP CURRENT
Check controller outputs or measure the milliamp
signal anywhere in the loop. The PIECAL 334Plus
measures 0.000 to 52.000 mA (-25.00 to 300.00%)
signals with greater accuracy than a typical
multimeter.
• POWER & MEASURE 2 WIRE TRANSMITTERS
The PIECAL 334Plus can simultaneously output 24V DC to power any and all
devices in a process loop using the internal batteries and internal switching power supply, while
measuring the output of a 2 Wire Transmitter and any other loop devices. Powers HART™
transmitters with built-in 250 ohm resistor simplifying hookups with HART communicators.
• READ DC VOLTS
The PIECAL 334Plus can measure from -99.99 to +99.99 VDC with 10mV resolution. Use it to
check loop power supplies, I/V converters, 1 to 5 Volt signals, and other voltages making it
unnecessary to carry an additional multimeter.
Automated mA Loop Calibrator
Operating Instructions
Automated mA Loop Calibrator
Operating Instructions
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qPOWER SWITCH
Select “mA” to display and calibrate in milliamps.
Select “% 4 to 20 mA” to display and calibrate
in percent. Select “READ VDC” to read volts
DC. Return the slide switch to the “OFF”
position when not in use.
Note:
Percent mode can also be used with chart
recorders, valves or current trips that display in
percent.
100.00% = 20.000 mA
75.00% = 16.000 mA
50.00% = 12.000 mA
25.00% = 8.000 mA
0.00% = 4.000 mA
To convert from Milliamps to Percent:
Percent = (Milliamps - 4) / 0.16
To convert from Percent to Milliamps:
Milliamps = Percent / 6.25 + 4
wSOURCE / READ / 2 WIRE SWITCH
Select “SOURCE” to output in mA or percent.
Select “READ” to read in mA or percent.
Select “2 WIRE” to simulate a 2 Wire Transmitter.
eEZ-CHECK™ SWITCH
Instantly output 4.000 mA or 20.000 mA by moving
the EZ-CHECK™ switch to the “4.00mA” /“0.0%”
position or “20.00mA”/“100.0%” position.
For fast
three point checks select the “DIAL” position.
The PIECAL 334Plus will remember the last
“DIAL” value, even with the power off.
Note: The same “DIAL” value is stored for both
mA and %. The recalled value will be displayed
in the units selected.
rDIAL KNOB
Turn the knob to adjust output level. Turn
clockwise to increase the output, counter
clockwise to decrease the output 0.001 mA
(0.01%) at a time. Push and turn the knob for
faster dialing adjusting 0.100 mA (1.00%) at a
time. Press and Hold the knob to start automatic
stepping or ramping. Double click the knob for
stepping and Ground Leak Detection setup.
tEXTERNAL POWER JACK (Not Shown)
When used with the optional AC Adaptor, the
external power jack will eliminate the drain on
your batteries. This is handy for jobs that require
extended bench use of the PIECAL 334Plus.
See accessories (page 10) for ordering information.
Note: This feature does not charge the batteries,
it only supplies power to the PIECAL 334Plus.
CHANGING BATTERIES
Low battery is indicated by “BAT” on the display.
Approximately one to four hours of typical
operation remain before the 334Plus will
automatically turn off. To change the batteries;
remove the rubber boot, remove the battery door
from the back of the unit by sliding the door
downward. This allows access to the battery
compartment. Replace with four (4) “AA” 1.5V
batteries being careful to check the polarity.
Replace the battery door & replace the boot. All
stored configuration options are reset to factory
settings when the batteries are removed.
Note: Alkaline batteries are supplied and
recommended for maximum battery life &
performance.
Basic Operation
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Page 3
Configuration
Power On Options
HART MODE, AUTO OFF & BACKLIGHT
Move q POWER SWITCH to “mA”, “% 4 to 20
mA” or “READ VDC”.
The following display will appear for 3 seconds:
Press the rDIAL KNOB on while this screen is
displayed for basic setup options. The following
display will appear for 30 seconds:
Turn the rDIAL KNOB to move through the
menu. Press the rDIAL KNOB to toggle
between OFF and ON. These settings are
remembered even with the power off.
EXIT MENU - exits this menu immediately and
saves any changes. Menu will automatically exit
after 30 seconds of inactivity.
HART MODE - when ON a 250 Ohm resistor is
automatically inserted in series with the output.
This allows a HART Communicator to
communicate with a HART Transmitter without
adding an external resistor in the loop.
AUTO OFF - If AUTO OFF is ON, the unit will
turn off after 30 minutes of inactivity to save
battery life. If AUTO OFF is OFF the unit will stay
on until the POWER SWITCH is moved to the off
position.
BACKLIGHT - If BACKLIGHT is ON the
backlight will light all the time the unit is powered
up. For maximum battery life turn the backlight
off when using the 334Plus in areas with enough
ambient light to read the display.
Note: All settings are remembered even with the
power off. Removing the batteries resets the
values to factory defaults.
PRESS AND HOLD
EZ-DIAL
TO ENTER
SETUP MENU
> EXIT MENU
HART MODE OFF
AUTO OFF OFF
BACKLIGHT OFF
Advanced Options
STEPS, RAMP & GROUND LEAK DETECTION
Setup
Double click the rDIAL KNOB at any time the
unit is on and the following display will appear
for 30 seconds:
Turn the rDIAL KNOB to move through the
menu. Press the rDIAL KNOB to toggle
between OFF and ON or to change the steps
setting. These settings are remembered even
with the power off.
EXIT MENU - exits this menu immediately and
saves any changes. Menu will automatically exit
after 30 seconds of inactivity.
STEPS - pressing the knob will cycle from 2, 3,
5 steps and RAMP.
2 steps will automatically switch between 4 &
20 mA (0 & 100%).
3 steps between 4, 12 & 20 mA (0, 50 &
100%).
5 steps between 4, 8, 12, 16 & 20 mA (0, 25,
50, 75 & 100%).
RAMP will continuously ramp the output
between 4 & 20 mA (0 & 100%).
GROUND LEAK DETECTION - when ON the
334Plus has the ability to check for current leaks
caused by ground faults, moisture or corrosion.
This operates in Power/Measure mode while
powering up a 2-wire transmitter or loop.
Note: All settings are remembered even with the
power off. Removing the batteries resets the
values to factory defaults.
> EXIT MENU
STEPS 5
GND LEAK DET OFF
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mA OUT, % OUT (Percent of 4 to 20 mA)
Choose this function to provide an output from 0.00 to 24.00 milliamps. The compliance voltage is a
nominal 24 VDC to provide the driving power to your milliamp receivers.
1) Disconnect one or both input wires from
the device to be calibrated.
2) Select “mA” or “% 4 to 20mA” with slide
switch q.
3) Select “SOURCE” using slide switch w.
4) Connect the output leads of the PIECAL
334Plus to the inputs of the device being
calibrated, making sure to check polarity.
Red lead to the plus (+) input and black
lead to the minus (-) input.
The output is adjusted in 0.001 mA (0.01%)
increments by turning the knob r while the
EZ-CHECK™ switch eis in the “DIAL”
position, or the current can be set at the
fixed points of 4.000mA (0.00%) or
20.000mA (100.00%) with switch e. Press
and turn the knob for faster dialing with
0.100 (1.00%) increments.
Start automatic stepping or ramping by pressing and holding the rDIAL KNOB for 3 seconds. The
word STEPPING or RAMPING will flash on the display anytime the selected automatic function is
running. The 334Plus will automatically step or ramp between 4mA & 20mA (or 20mA & 4mA) for 30
seconds then reverse direction. Stop the stepping or ramping by pressing or turning the knob or
moving any switch.
Sourcing Milliamps
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Using Automatic STEP & RAMP output
Move q POWER SWITCH to “mA”, or “% 4 to 20 mA” and
the wSOURCE / READ / 2 WIRE SWITCH to “SOURCE” or “2 WIRE”.
The starting point for automatic stepping & ramping is based
on the eEZ-CHECK SWITCH. Place the EZ-CHECK switch
at 20 mA and the automatic stepping or ramping will start at
20.000 mA (100.00%) and the values will decrease. Place the
EZ-CHECK switch at 4 mA and the automatic stepping or
ramping will start at 4.000 mA (0.00%) and the values will
increase.
Start automatic stepping or ramping by pressing and holding the rDIAL KNOB for 3 seconds. The
word STEPPING or RAMPING will flash on the display anytime the selected automatic function is
running. The 334Plus will automatically step or ramp between 4mA & 20mA (or 20mA & 4mA) for 30
seconds then reverse direction. Stop the stepping or ramping by pressing or turning the knob or
moving any switch.
Page 4
Using Automatic Stepping & Ramping
STEPPING OUT
12.000mA
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Page 5
2 Wire mA, 2 Wire % (Percent of 4 to 20 mA)
Choose this function to simulate a 2 Wire Transmitter output from 0.000 to 24.000 milliamps.
Operates in loops with power supply voltages from 2 to 100 VDC
Simulate 2-Wire Transmitters
1) Disconnect one or both input
wires from the device to be cali-
brated.
2) Select “mA” or “% 4 to 20mA”
with slide switch q.
3) Select “2 WIRE” using slide
switch w.
4) Connect the red input lead of
the 334Plus to the plus (+) input
of the field connections and the
black lead to the minus (-).
Loop current is adjusted in 0.001 mA
(0.01%) increments by turning the knob r while the EZ-CHECK™ switch eis in the “DIAL”
position, or the current can be set at the fixed points of 4.000mA (0.00%) or 20.000mA (100.00%)
with switch e. Press and turn the knob for faster dialing with 0.100 (1.00%) increments.
Start automatic stepping or ramping by pressing and holding the rDIAL KNOB for 3 seconds. The
word STEPPING or RAMPING will flash on the display anytime the selected automatic function is
running. The 334Plus will automatically step or ramp between 4mA & 20mA (or 20mA & 4mA) for 30
seconds then reverse direction. Stop the stepping or ramping by pressing or turning the knob or
moving any switch.
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To change the Automatic Stepping & Ramping settings
Double click the rDIAL KNOB at any time the unit is on and the following display will appear for 30
seconds:
Turn the rDIAL KNOB to move through the menu. Press the rDIAL KNOB to toggle between OFF
and ON or to change the steps setting. These settings are remembered even with the power off.
EXIT MENU - exits this menu immediately and saves any changes. Menu will automatically exit after
30 seconds of inactivity.
STEPS - pressing the knob will cycle from 2, 3, 5 steps and RAMP.
2 steps will automatically switch between 4 & 20 mA (0 & 100%).
3 steps between 4, 12 & 20 mA (0, 50 & 100%).
5 steps between 4, 8, 12, 16 & 20 mA (0, 25, 50, 75 & 100%).
RAMP will continuously ramp the output between 4 & 20 mA (0 & 100%).
Setting Up Automatic Stepping & Ramping
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Signals exceeding ±60.00 VDC are indicated
by ion the display.
Reading Milliamp Outputs
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READ V
Choose this function to measure from -99.99 to +99.99V DC.
1) Select “READ VDC” with slide switch q.
2) Connect the red (+) and black (-) leads of the PIECAL
334Plus across the voltage source to be measured.
Any DC voltage from -99.99 to +99.99 volts may be
measured. Loop power supplies, signal voltages at
receivers, batteries and transmitter voltage drops may be
measured. Signals exceeding ±60.00 VDC are indicated by
i on the display. Signals exceeding ±99.99 VDC will be
indicated by “OVERRANGE” flashing on the display.
Read DC Volts
Voltage to be Measured
Battery
Loop Power Supply
Transmitter Voltage Drop
1 to 5 Volt Loops
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READ i
72.83 V
READ mA, READ % (Percent of 4 to 20 mA)
Choose this function to measure from 0.000 to 52.000 milliamps or -25.00 to 300.00%.
1) Open the current loop at any convenient point
along the signal path.
2) Select “mA” or “% 4 to 20mA” with slide
switch q.
3) Select “Read” using slide switch w.
4) Connect the red input lead (+) of the
PIECAL 334Plus to the more positive
point of the break and the black input to
the more negative point.
Signals below 0 mA or open circuits are
indicated by 0.000 mA (-25.00%) on the
display. Signals above 52 mA are current
limited by protection circuitry and
“OVERRANGE” is flashed on the display.
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Page 7
mA OUT, % OUT (Percent of 4 to 20 mA)
Choose this function to simultaneously supply power to a 2 Wire Transmitter while displaying the 4
to 20 mA output of the transmitter.
1) Disconnect one or both input wires from
the device to be calibrated.
2) Select “mA” or “% 4 to 20mA” with slide
switch q.
3) Select “SOURCE” using slide switch w.
4) Press and turn the knob r clockwise
several times until full scale output
(24.000 mA/125.00%) is obtained. The
display will indicate “FULL SCALE”.
5) Connect the red source lead of the
PIECAL 334Plus to the plus (+) input of
the device and the black source lead to
the minus (-).
The PIECAL 334Plus supplies a nominal 24 volts DC at 24 mA to the 2 Wire Transmitter. The current
passed by the transmitter will be accurately displayed by the PIECAL 334Plus. Calibrate the
transmitter in the usual manner and disconnect the PIECAL 334Plus. If Ground Leak Detection is
enabled the amount of milliamps leaking in the transmitter or loop is indicated on the display.
Power & Measure 2-Wire Transmitters
Typical
2-Wire
Transmitter
+ IN - REF+OUT-
Transmitter Input
Sensor
Process Signal
Simulated Input
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The PIECAL 334Plus is supplying the loop
voltage. There is an control loop error. This
may be a transmitter (set for upscale burnout)
with a bad or missing sensor, or a short in the
loop.
The PIECAL 334Plus is supplying the loop
voltage. A calibrated transmitter is limiting the
loop current to 12.00 mA. An additional 0.28
mA is not controlled by the transmitter and is
leaking somewhere in the loop.
mA OUT, % OUT (Percent of 4 to 20 mA)
Find current leaks in loops caused by ground faults, moisture or corrosion. The 334Plus
simultaneously supplies power to a 2 Wire Transmitter (or loop with a transmitter) while displaying
the 4 to 20 mA output and the amount of current leaking in the loop.
1) Disconnect one or both input wires from
the device to be calibrated.
2) Select “mA” or “% 4 to 20mA” with
slide switch q.
3) Select “SOURCE” using slide switch w.
4) Turn the knob r clockwise several
times until full scale output (>24.000
mA/125.00%) The display will indicate
“FULL SCALE” and “LEAKAGE:”
5) Connect the red source lead of the
PIECAL 334Plus to the plus (+) input of
the device and the black source lead to
the minus (-).
The PIECAL 334Plus supplies a nominal 24 volts DC at 24 mA to the 2 Wire Transmitter or loop. The
current passed by the transmitter will be accurately displayed by the PIECAL 334Plus along with an
indication of leakage current at the bottom of the display. If there is an uncontrolled loop, a transmitter
with upscale burnout and bad or missing sensor or a short the 334Plus displays “iLOOP > 24mA”
Note: Many installed transmitters will normally indicate 0.01 to 0.10 mA leakage without significant
control problem. Unstable readings may indicate loose connections or the presence of moisture.
Using Ground Leak Detection
Typical
2-Wire
Transmitter
+ IN - REF+OUT-
Transmitter Input
Sensor
Process Signal
Simulated Input
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FULL SCALE OUT
24.179 mA
iLOOP > 24mA
FULL SCALE OUT
12.280 mA
LEAKAGE: 00.28mA
Setting Up Ground Leak Detection
Enabling Ground Leak Detection
Double click the rDIAL KNOB at any time the unit is on and the following display will appear for 30
seconds:
Turn the rDIAL KNOB to move through the menu. Press the rDIAL KNOB to toggle between OFF
and ON or to change the steps setting. These settings are remembered even with the power off.
EXIT MENU - exits this menu immediately and saves any changes. Menu will automatically exit after
30 seconds of inactivity.
GROUND LEAK DETECTION - when ON the 334Plus has the ability to check for current leaks
caused by ground faults, moisture or corrosion that bypass the current control element or transmitter.
Typical Error Conditions
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Page 9
OUT OF RANGE SIGNALS
Signals below 0 mA or open circuits are indicated
by 0.000 mA (-25.00%) on the display. Signals
above 52 mA are current limited by protection
circuitry to approximately 54 mA.
KEEPING THE PROCESS GOING
When an instrument in a critical control loop
develops a problem it is important to maintain
control of the process. The PIECAL 334Plus can
be substituted for a faulty controller or transmitter
to provide temporary manual control of the
process. One technician takes manual control of
the process while a second technician retrieves,
installs and configures a replacement instrument.
OPEN LOOPS
The display will indicate ERROR and 0.000 mA
or -25.00% if there is an open loop or if the
polarity is reversed. Check all the connections in
the loop or try reversing the leads.
POWER TRANSMITTER
Adjusting the SOURCE output to full scale (>24
mA) supplies a nominal 24V DC to power a 2
Wire Transmitter while simultaneously displaying
the 4 to 20 mA output of the transmitter.
READ MILLIAMPS
Select READ milliamps by moving slide switch
q to “mA” or “% 4 to 20mA” and moving slide
switch wto “READ”. Place the PIECAL 334Plus
in the loop in series with the current to be
measured.
SOURCE MILLIAMPS or 2-WIRE SIMULATOR
Select “SOURCE” using slide switch wto output
from 0.000 to 24.000 milliamps using the
PIECAL 334Plus’s internal power source. This
will provide 24V DC. Select “2-WIRE” to control
the current in a loop that is using an existing
power supply.
To change the output current adjust the dial
knob r. Turning clockwise will increase the
output value, turning counter-clockwise will
decrease the output value with 0.001 mA
(0.01%) resolution. Press and turn the knob for
faster dialing with 0.100 mA (1.00%) resolution.
The output is adjustable in all EZ-CHECK™
positions.
When returning to the “4.00mA”/“0.0%” and
“20.00mA”/”100%” positions they will always
return to 4.00 (0.0%) and 20.00 (100.0%) mA.
This method is superior to keypad units. The
zero and full scale positions can be adjusted
smoothly making easy valve end stop testing,
trip point testing, alarm testing, etc. There is
virtually no overshoot/undershoot simplifying
testing.
READ DC VOLTS
Select “READ VDC” using slide switch qto read
volts DC. Clip the leads across the voltage to be
measured.
GROUND LEAK DETECTION - when ON the
334Plus has the ability to check for current leaks
caused by ground faults, moisture or corrosion
that bypasses the current control element or
transmitter. The 334Plus powers up the 2-wire
transmitter or loop and indicates the total current
and the uncontrolled current. This provides
information useful in troubleshooting loop errors.
Application Notes
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Accessories
AC ADAPTOR (200 to 240 VAC) Part No. 020-0100
AC ADAPTOR (100 to 120 VAC) Part No. 020-0101
Ni-MH 1 Hour Charger w/4 Ni-MH AA Batteries Part No. 020-0103
Warranty
Our equipment is warranted against defective material and workmanship (excluding batteries) for a
period of three years from the date of shipment. Claims under warranty can be made by returning
the equipment prepaid to our factory. The equipment will be repaired, replaced or adjusted at our
option. The liability of Practical Instrument Electronics (PIE) is restricted to that given under our
warranty. No responsibility is accepted for damage, loss or other expense incurred through sale or
use of our equipment. Under no condition shall Practical Instrument Electronics, Inc. be liable for any
special, incidental or consequential damage.
SETTING UP VALVES
When setting up a valve it is important to correctly set the end stops. Use the PIECAL 334Plus to
supply the 4 to 20 mA control signal to stroke the valve. Select “SOURCE” and the PIECAL 334Plus
will use the internal power source for outputting current or switch to 2-WIRE SIMULATOR to stroke
a valve using any pre-existing installed loop power supply as the power source.
Example:
1) Disconnect the 4-20 mA control wires from the Current-to Pressure (I/P) converter or the actuator.
2) Connect the PIECAL 334Plus following the connection diagrams on the previous pages for
Simulate 2-Wire Transmitters
3) Move the EZ-CHECK™ switch eto “4.00 mA”/”0.0%” and adjust the fully closed stop on the
actuator.
4) Turn the PIECAL 334Plus’s knob r slowly counterclockwise and verify that the actuator and
valve don’t move. Repeat steps 3 & 4 until no movement is detected.
5) Move the EZ-CHECK™ switch e to DIAL and quickly back to “4.00 mA”/”0.0%” then turn the
PIECAL 334Plus’s knob r clockwise. The actuator and valve should begin to move.
6) Move the EZ-CHECK™ switch e to “20.00 mA”/”100.0%” and adjust the fully open stop on the
actuator.
7) Turn the PIECAL 334Plus’s knob r slowly clockwise and verify that the actuator and valve don’t
move. Repeat steps 6 & 7 until no movement is detected.
8) Move the EZ-CHECK™ switch e to DIAL and quickly back to “20.00 mA”/”100.0%” then turn
the PIECAL 334Plus’s knob counterclockwise. The actuator and valve should begin to move.
Stroking Valves
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General
Operating Temperature Range -20 to 60 °C (-5 to 140 °F)
Storage Temperature Range -30 to 60 °C (-22 to 140 °F)
Relative Humidity Range 10 % ≤RH ≤90 % (0 to 35 °C), Non-condensing
10 % ≤RH≤ 70 % (35 to 60 °C), Non-condensing
Size 5.63 x 3.00 x 1.60 inches, 143 x 76 x 41 mm (L x W x H)
Weight 12.1 ounces, 0.34 kg (including boot & batteries)
Batteries Four “AA” Alkaline 1.5V (LR6)
Optional AC Adaptors 120 VAC 50/60 Hz [Part # 020-0100]
240 VAC 50/60 Hz [Part # 020-0101]
Optional NiMh
Rechargeable battery kit 120 VAC for North America Only; charger, four NiMh
batteries, AC & DC cords [Part # 020-0103]
Low Battery Low battery indication with nominal 1 hour of operation
left
Protection against misconnection Over-voltage protection to 135 vrms (rated for 30 seconds)
or 240 vrms (rated for 15 seconds)
Display High contrast graphic liquid crystal display with 0.315” (8.0
mm) high digits. LED backlighting for use in low lit areas.
Read mA
Ranges and Resolution
0.000 to 52.000 mA or -25.00 to 300.00% of 4-20 mA
Accuracy
Below 24.01mA
Above 24.00mA
≤ ± (0.05 % of 24.00mA) (± 0.012mA)
≤ ± (0.05 % of 52.00mA) (± 0.026mA)
Voltage burden ≤ 2V at 50 mA
Overload/Current limit protection 54 mA nominal
Battery life ≥ 125 Hours nominal
≥ 100 hrs with backlight on
PIECAL 334Plus Specifications
(Unless otherwise indicated all specifications are rated from a nominal 23 °C,
70 % RH for 1 year from calibration)
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com

Source/Power & Measure Two Wire Transmitters
Ranges and Resolution 0.000 to 24.000 mA or -25.00 to 125.00% of 4-20 mA
Accuracy
EZ Check(s) at 4 & 20mA1
0.0 to 24.00 mA
≤ ±(0.025% of Span at 4 mA & 20 mA) (± 0.005mA)
≤ ± (0.05% of 24.00mA Span) (± 0.012mA)
Noise ≤ ± ½ Least Significant Digit
Temperature effect ≤ ± 0.005 %/°C of FS
Loop compliance voltage ≥ 24 DCV @ 20.00mA
Loop drive capability 1200 Ω at 20 mA for 15 hours nominal;
950 Ω with Hart Resistor enabled 334Plus
Battery life ≥ 30 hrs at 12 mA nominal; ≥ 25 hrs with backlight on
1These are internal calibrated cardinal reference points and accuracy is not defined or limited by display
resolution
2-Wire Transmitter Simulation
Accuracy Same as Source/Power & Measure
Voltage burden ≤ 2V at 20 mA
Overload/Current limit protection 24 mA nominal
Loop voltage limits 2 to 100 VDC (fuse-less protected from reverse polarity
connections)
Battery life ≥ 125 hours nominal; ≥ 100 hrs with backlight on
Voltage Read
Range and Resolution -99.99 to +99.99 VDC Full Span (FS)
Accuracy ≤ ± 0.05 % of FS
Temperature effect ≤ ± 100 ppm/°C of FS
Input resistance ≥ 2 MΩ
Battery life ≥ 125 hours nominal; ≥ 100 hrs with backlight on
PIECAL 334Plus Specifications (continued)
(Unless otherwise indicated all specifications are rated from a nominal 23 °C,
70 % RH for 1 year from calibration)
Additional Information
This product is calibrated on equipment traceable to NIST and includes a Certificate of Calibration.
Test Data is available for an additional charge.
Practical Instrument Electronics recommends a calibration interval of one year. Contact your local
representative for recalibration and repair services.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com