Heaters Controls and Sensors Limit Controllers


These FM approved Limit Controllers will shut down the process by disconnecting power from the process if the controller reads a value above setvalue for a Hi Limit Controller or below set point if configured as a low limit control. 

These Limit Controllers will remain in this state until the temperature has dropped below the set value and the reset button has been pressed. The control also has a timer to indicate the total time the setpoint is exceeded i.e. (duration of over temperature) it also has a register that will indicate the maximum temperature reached. Field programmable Low / High Process alarms and deviation alarms or band alarms are an option.

Limit Controllers Features:

  • FM approved Limit Controllers
  • Compact economical 1/16 DIN size
  • Easy to use, yet powerful
  • Time of over temperature condition indication
  • User selectable as high or low limit
  • Universal Inputs, Timer, Register, Retransmission, Communication
  • NEMA 4 IP65 Front Panel

Field Selectable Input/Output Controller Specifications:

Thermocouple Type J, K, T, R, B, S, L, N
RTD PT 100
Millivolts mV, 0-50mV DC, VDC, 0-5VDC, 1-5VDC, 0-10VDC, 2-10VDC mA, 0-20mA 4-20mA
Output 1 Limit Relay SPDT 5Amp at 120/240 VAC resistive
Output 2 Alarm/Annunciator SPDT 2A 120/240 VAC resistive
Output 3 DC Linear (recorder) 0-20mA 4-20mA 0-1 OV 0-5V SPDT relay 2A resistive 120/240 VAC
OUTPUT Limit Control Output

The output type (high limit type or low limit type) is selectable by the user via dip switch. 

Alarms Two soft alarms up to two outputs can be used for alarms.
Combination Alarms Logical OR or AND of alarms to an individual hardware output.
Accuracy + -0.3% (of output span)
Noise-rejection Ratio

Normal Mode 40dB (50/60Hz)

Common Mode 120dB (50/60Hz)

Baud Rate 1200, 2400, 4800, 9600 BPS
Type Serial asynchronous UART to-UART link RS 485
Max # of Zone 32
Physical Layer RS 485
Operating Temperature 0-55°C
RH 20% - 95% nn condensing
Supply Voltage 90 - 264 VAC 50/60 Hz or 22-50 VDC (Optional)
Accuracy +/- .25% of span +/- LSD
Dimensions 48 x 48 x 100-mm.