M-34-01-06 3/31/2016
7
DQ15D/T-DQ15D Manual
2 Wire RTD Sensor Calibration (Continued)
11
Press and hold SET for 1 second. The screen
displays HoLd . WAIT for the display to reset. After
resetting, the connected precision resistors’ ap-
proximate temperature value should display (i.e.
511° F or 266° C).
12
Turn OFF power and remove the precision resis-
tors. Reinstall the RTD sensor and the rear cover
of the controller. Return the calibrated controller to
service.
3 Wire RTD Sensor Calibration
Optional input boards, Item # 5447 or 5416 need-
ed. This board will accept 2 wire RTDs as well. RTD
devices are precision resistors whose resistance val-
ue varies with temperature. The connection of a third
wire eliminates the natural resistance of the lead
wires to improve sensor accuracy. The DQ15D con-
trol measures the RTD resistance (and the third wire
resistance) and compares that measurement with a
standard set of values stored in the memory.
You can restore, update or verify that the standard set of
values is correct.
Note: For a 1000 ohm sensor, the DIP switch-
es should be OFF, OFF, OFF. For 100 ohm, ensure
the DIP switches are ON, OFF, OFF. See Dip
Switch Settings in
Configuration (Setup).
Equipment needed
Two precision resistors (tolerance +/- 0.1% or bet-
ter) with a fixed value equal to the RTD nominal
value (i.e. 1000 or 100 ohms).
A suitable jumper cable to facilitate changing input
resistance.
A short piece of jumper wire (simulates third wire).
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 teste
d 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 RTD sensor.
4
Install the short piece of jumper wire from terminal
#1 to #3.
5
Install the precision resistors in place of the RTD
sensor, as shown in terminals #2 and #3.
6
Install the jumper cable between the loose end of
one of the resistors and the fixed end of the other
resistor to establish an input value of a single re-
sistor (i.e. 1000 ohms or 100 ohms), as shown.
7
Carefully restore power to the controller. Do not
come in contact with any exposed voltage.
3-Wire RTD Calibration
– Precision Resistors
and Jumper Wire in Place
