IM_1GSW-02
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Local and Remote Temperature Models
For Immersion Sensing: Use of a thermowell is highly recommended to aid in maintenance. Insert the sensor housing (0.25”
diameter) into the well ensuring that the housing bottoms out and will be completely immersed in the media (2.5” min.) Secure
the sensor using an appropriately sized compression fitting or union connector. Refer to options W073, W074 and W080 in the
Excela technical brochure.
For Surface Sensing: Secure the sensor housing to the pipe or vessel using an adhesive or strapping method suitable for the
application.
WIRING
Tools Required
Phillips-head screwdriver
Wire strippers
ALL MODELS ACCEPT 8-50 VDC DISCRETE POWER SOURCE DIRECTLY FROM DIGITAL INPUTS of PLCs, DCSs AND OTHER
LOW-POWER DC LOADS. THE SWITCHED OUTPUT MAXIMUM LOAD RATING IS 0.1A. OVERLOADING THE SWITCH MAY
CAUSE FAILURE.
THE DEVICES SHALL BE PROPERLY GROUNDED IN THE END USE APPLICATION.
THE INPUT POWER SHALL BE NEC/CEC CLASS 2, UL/CSA/IEC 60950 LPS OR UL/CSA/IEC 61010 LIMITED ENERGY
LEADWIRES MUST BE RATED 105°C MINIMUM. FOR AMBIENT TEMPERATURES BELOW -10°C, USE SUITABLE FIELD WIRING.
Excela is powered through the residual current of the PLC
Note: For bench testing using a 24 VDC power supply, use the test resistor supplied (1.8K Ω) with the unit.
• Loosen the four (4) Phillips-head screws holding the faceplate to the enclosure. Gently remove the faceplate module. Dis-
connect the 8 wire connector from the faceplate to allow easy wiring.
• Pass the wires through the conduit connector and connect to the terminal block. You can wire the unit as a Normally
Open or a Normally Closed switch.
Terminal Block Wiring
• Excela’s terminal block is marked Common (COM), Normally Closed (NC) and Normally Open (NO)
• If replacing a mechanical switch, match the wiring to make it simple.
• The unit is not polarity sensitive and mimics a mechanical SPDT switch operation
• Terminal block accepts 12-24 AWG wiring.
• Reconnect the 8 wire connector to the faceplate which is keyed and can only be connected one way.
• Place the faceplate back on the enclosure and re-attach using the (4) Phillips screws (4 in-lbs or 0.45 N-m). DO NOT OVER-
TIGHTEN.
Wiring configurations
The signal output of the Excela mimics that of a single pole double throw (SPDT) mechanical switch. When connecting the
Excela to a programmable logic controller (PLC), this is the signal the PLC sees coming from the Excela:
When wiring Normally Open (NO) and Common (COM)
• PLC sees open circuit below setpoint
• PLC sees closed circuit above setpoint
When wiring Normally Close (NC) and Common (COM)
• PLC sees closed circuit below setpoint
• PLC sees open circuit above setpoint
