Data Sheet

T/320PRT Temperature Sensor

T/320 PRT Temperature Sensor Data Sheet: 91-1651 Issue 2/C 19/7/01 1

Description

The T/320 PRT Room Temperature sensor provides an accurateway of measuring room temperature, in a low profile enclosuredesigned for good thermal response. Available in a range ofarchitectural finishes to blend with room decor. Optional knob forlocal setpoint adjustment. The electronics are fully enclosed in awell ventilated housing which clips onto a separate backplate forease of installation. Two part connectors aid commissioning.

Features

• Pt 100 accuracy.• 4 to 20 mA output.• Precalibrated for ease of commissioning.• Optional low profile adjustment knob (1 to 11 kΩ range).

PRT TEMPERATURE SENSOR

86 m

m

Physical

86 mm 35 mm

T/320 Data Sheet

INSTALLATION

Choose an accessible location for the sensor where thesurrounding air temperature is representative of the room. Avoidlocating the sensor where it will be subject to radiated heat.

The backplate is designed so that it can be mounted on arecessed wiring box, or surface mounted with minitrunking byknocking out a section of one side wall. The backplate can bemounted to accept cable entry from any orientation, but normallyit should be fitted with the TOP arrow pointing up.

(1) Fix the backplate to the wall or conduit box usingscrews provided (35 mm fixing centres).

(2) Remove the terminal blocks from the sensor andwire them as shown. Ensure that the input links onthe IQ controller are set correctly.

Note that if connecting to an IQ22x controller (including/ADL or /OC) for the 4 to 20 mA input, do not connectto C (+24V) instead connect to AUX+ (+24V).

(3) Plug the terminal blocks back into the sensor. Ifthe adjustment knob has been fitted ensure thatthe terminal block for the sensor is placed in thesocket nearest the edge and the terminal block forthe knob in the other socket.

(4) Clip the sensor onto the backplate making surethat the cables are routed through the cable exit.If required, the unit can be made tamper proof bycutting away a small section of the bottom wall sothat a S/T security screw can be inserted in thehole to engage one of the lugs on the back of thesensor.

SPECIFICATIONSProduct description :PRT Space Temperature SensorPRT range :-10 to +40 °CAccuracy PRT element :BS1904 -1980 Class B 100 Ω ±0.1%

at 0 °CAccuracy transmitter :0.2 % span.Output :4 to 20 mA 2 wireFlammability rating :94 V-0.Ambient limits :-10 to +50 °CEnclosure material :Borg Warner Cycolac KJBE or

equivalent.Dimensions :86 mm x 86 mm x 35 mm (+4 mm for

knob)Connections :2 part screw terminals for 0.5 to

2.5 mm2 cableSupply Voltage :24 Vdc ±15%Current :4 to 20 mAKnob value :1 to 11 kΩ. ±20 %

ORDER CODES

T/320 PRT Space Temperature SensorT/320/K PRT Space Temperature Sensor plus Adjustment Knob

IQ ScalingFor IQ controllers the input channels must be set up correctlyand the sensor type modules must be set up with the correctscaling. For all IQ2 series controllers with firmware of version2.1 or greater use the following tables; for all other IQ controllerssee the Sensor Scaling Reference Card, TB100521A.

KnobLink input channel for thermistor, T; use sensor type scalingmode 5, characterise, with the input type set to 3 (Kohms) andthe table below (this produces a trim of -3 to +3):

Trend Control Systems Ltd reserves the right to revise this publication from time to time and make changes to the content hereof withoutobligation to notify any person of such revisions or changes.

Trend Control Systems Ltd. P.O. Box 34 Horsham Sussex RH12 2YF England Tel:+44 (0)1403 211888 Fax:+44 (0)1403 241608 www.trend-controls.com

T/320 PRT Temperature Sensor Data Sheet: 91-1651 Issue 2/C 19/7/01

fixing screws 35 mmfixing centres

cable exits

thread cablethrough exit

backplate

clip sensor tobackplate

35 m

m

320 Option

320/K Option

!

"

#

2

Y E U L P 1I 2I 1O 2O

2 3 04 01- 2 4 02 01- 04

SensorLink input channel for current, I; use sensor type scaling mode5, characterise, with input type set to 2 (current) and the tablebelow:

Y E U L P 1I 2I 1O 2O

3 1 1.3 1.3- 2 1 11 3- 3

System accuracy (including controller) :±0.25 °C (-10 to 40 °C)