4-20Ma Process Output (Optional) - Process Technology DQ15D Instruction Manual

4-20 mA Output ("-M" Option)
The DQ15D is available with an optional 4-20 mA
output signal proportional to the measured (displayed)
temperature. This option is useful for source transmit-
ting the measured temperature to a current loop-
sensing device such as a PLC, remote intelligent dis-
play or chart recorder. Use Terminals #2 and #3 for 2
wire 1000 ohm RTD.
Factory calibration is verified using an intelligent NIST
traceable 4 digit DMM, a NIST traceable sensor cali-
brator, and an intelligent display.
The factory range setting is 0-500° F vs. 4-20 mA.
Custom ranges can be accommodated if specified at
time of order. Field calibration can use a similar ar-
rangement or a 4-20 mA calibrator for verification.
Since calibration is an involved operation, it is sug-
gested that it be performed only after determining that
the measured values differ from factory settings, or if
the output range is to be altered.
Use Terminals #2 and #3 for 2 wire 1000ohm RTD.
M-34-01-06 3/31/2016
Equipment needed:
•
Item #5416 or 5419 board.
•
An NIS T traceable sensor simulator (calibrator ),
a precision 20 mA or higher calibrator/tester, or a
precision DMM for verification.
Calibration procedures require the removal of
the rear cover of the control. It also requires that
power is ON, exposing the technician to poten-
tially lethal voltages. Exercise EXTREME CARE
and wear tested electrician's gloves whenever
power is on.
Les procédures de calibration nécessitent
l'enlèvement du panneau arrière du contrôle.
Ça exige aussi que le courant électrique est
allumé ce qui expose le technicien à des ten-
sions potentiellement létales. Utilisez toujours
un soin extrême et portez des gants certifiés
d'électricien quand le courrant est allumé.
Calibration Procedure:
1 Turn OFF all power.
2 Remove rear cover.
3 Remove sensor leads.
4 Install appropriate sensor calibrator, i.e. resistors
or thermocouple simulator.
5 Remove ONE lead of the 4-20 mA output wire and
install the DMM or tester in series with the external
loop and this terminal. OBSERVE POLARITY.
6 Restore power to control.
7 Verify basic instrument sensor input accuracy by
simulating various sensor inputs and observing the
display values. If out of tolerance, perform appro-
priate sensor calibration before proceeding.
8 Simultaneously press and hold
proximately 6 sec. The screen displays AC.0.
While the 0 is flashing, use
screen changes to display L followed by the cur-
rent lower process limit, i.e. 0°, -20°, 0V, etc.
9 Use or to alter the lower display value. Press
SET to store the new value. The display will then
read hexadecimal 2AAA or 4.0mA, verify that this
is the value displayed on your 4-20 mA calibra-
tor/tester or DMM.
12
and for ap-
to enter 33. The
DQ15D/T-DQ15D Manual