Low Cost Digital Temperature Switch Love Series 40


Digital Temperature Switch

  • Low Cost
  • Uses Standard Probes
  • On/Off Output
  • Adjustable On-Off Differential
  • Heats or Cools

The Series 40 is an on/off digital thermoregulator designed to accept thermocouple or RTD inputs and provide single or dual relay output. The Series 40 temperature switch is ideal for heating or cooling applications. Temperature measurements are displayed on the bright red LED. Programming is quick and easy using the front panel keys. The front panel also meets NEMA 4 (IP65) requirements. The unit features selectable temperature units (°F or°C), audible alarm, output status indication, load protection, and password protection.

Series 40 Low Cost Digital Temperature Switch -- Single Relay
Supply Voltage Degrees
 10140 110 VAC ºF
 11140 110 VAC ºC
 20140 230 VAC ºF
 21140 230 VAC ºC
 40140 24 VAC/DC ºF
40A-312 24 VAC/DC ºC

Series 40 Low Cost Digital Temperature Switch -- Dual Relay
Input Power Switch
 40A-121 RTD 110 VAC
 40A-221 Type J 110 VAC
 40A-321 Type K 110 VAC

¹NOTE: Internal buzzer not available on 2 relay output.


Inputs: Thermocouple: Type J, Type K; RTD: 100O DIN (0.00385 curve).
Working Ranges (by order code):
32 to 999°F (0 to 700°C) for "J" thermocouple;
32 to 999°F (0 to 999°C) for "K" thermocouple;
-58 to 999°F (-50 to 600°C) for 2 or 3 wire Pt 100 DIN probe.
Setpoint Range: From -99 to 999°F (-99 to 999°C).
Outputs: 10A @ 250 VAC SPDT relay (change-over contact).
Control Type: On-off with adjustable hysteresis.
Power Requirements: 230 VAC, 50/60 Hz, 1.5 VA; 115 VAC, 50/60 Hz, 1.5 VA; or 24 VAC, 50/60 Hz, 1.5 VA (by model).
Display: One red LED 3-digit display 0.51 in. (13.2 mm) high, output status indicator, temperature unit of measure indicators.
Resolution: 1°F or 1°C for all inputs, 0.1°C for DIN RTD input.
Ambient Temperature: 10-90% RH, non-condensing from 32 to 131°F (0 to 55°C).
Weight: 6.75 oz (190 g).
Front Panel Protection: NEMA 4 (IP65).
Alarm Buzzer: Internal, included.

Catalogue Service Manual