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Connecting the RTD Sensors (continued)
3
Route the process temperature RTD cable to the control center. Plug the con-
nector into receptacle in the side of the control center labeled “Process”. Hand
tighten the connector. Coil any excess cable and secure it with a wire tie.
Process Protection RTD Probe
The optional process protection RTD probe is a safety sensor that prevents the
heater from overheating in case of a process temperature sensor failure or insulated
hose failure.
The process protection RTD sensor senses the temperature leaving the heater
assembly to prevent damage to the process or the product in the hopper. It gener-
ates an alarm (A-49 or A-50) and shuts the heater off if the air temperature exceeds
the process protection setpoint. The element for this sensor is to be mounted in the
heater assembly outlet nozzle before the insulated hose is connected.
CAUTION: Always disconnect and lock out the main power sources before making
electrical connections. Electrical connections should be made only by qualified
personnel.
1 Turn the disconnect dial on the control center door to the Off or O posi-
tion. Lock out the main power (see Page 1-5 for complete lock out informa-
tion).
2
Insert the process protection RTD probe into the heater assembly outlet noz-
zle.
Center the end of the probe in the outlet so that the tip does not touch the
inlet tube walls. Tighten the nuts to lock the RTD probe in place.
3-12 l Installa
tion
ON
O OFF
Process
Protection
R
TD
Probe