CTH Controls
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CTH Controls
CTH Controls
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Designers and manufacturers: 1992 - 2016   ISO9001
London Electronics
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DIN Signal transmitters for load cell, process, pulse and temperature

High precision signal transmitters which are PC-programmable and only 22.5mm wide. We can also supply them pre-configured for you, so you only need to connect.

They are ideal for use in most industrial measurements, catering for 4 or 6 wire load cells, 4-20mA and 0-10V process signals, DC voltages up to 600V and DC current up to 5A.

They also include pulse input versions for total, rate, period, phase angle and quadrature.

DIN Signal Transmitter Load Cell input transmitter with 4-20 mA, 2 alarm & RS232/RS485 output
  • 4 or 6 wire load cell connection. 10v 120mA Excitation supply.
  • 5V at 100mA is user selectable.
  • LT20-WM1 = 85-265V AC, standard software
  • LT21-WM1 = 10-48V DC, standard software
DC input transmitter (4-20mA, 0-10V, 1-5V, 5A, 600V) with 4-20 mA, 2 alarm & RS232/RS485 output
  • 5 selectable voltage input ranges from 0-200mV to 0-600V and
  • 4 selectable current input ranges from 0-2mA to 0-5A.
  • LT20-P = 85-265V AC, standard software
  • LT21-P = 10-48V DC, standard software
PT100 input transmitter with 4-20 mA, 2 alarm & RS232/RS485 output
  • LT20-385C = 85-265V AC, standard software
  • LT21-385C = 10-48V DC, standard software
Pulse input rate/total transmitter with 4-20 mA, 2 alarm & RS232/RS485 output
  • LT60-FR = 85-265V AC, standard software
  • LT61-FR = 10-48V DC, standard software
Serial input RS232/485 transmitter with 4-20 mA, 2 alarm & RS232/RS485 output
  • LTS60 = 85-265V AC, standard software
  • LTS61 = 10-48V DC, standard software
Thermocouple input transmitter with 4-20 mA, 2 alarm & RS232/RS485 output
  • LT20-KC = 85-265V AC, standard software
  • LT21-KC = 10-48V DC, standard software
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Common Specifications


Analogue Output (standard)
Output Levels 4-20 mA, 0-20 mA, 0-10 Vdc, -10 to +10Vdc (user selectable)
Compliance at 20 mA 10V (0-500Ω load)
Compliance at 10V 2 mA (5 kΩ or higher load)
Output Resolution 16 bits (65,536 steps)
Output Accuracy 0.02% of output span plus conversion accuracy
Output Isolation 250V rms working, 2.3 kV rms per 1 minute test
Step response time 50 ms
Serial Data Output (standard)
Signal Types RS232 or RS485 (half or full duplex), jumper selectable
Data Rates 300, 600, 1200, 2400, 4800, 9600, 19200 baud
Output Isolation 250V rms working, 2.3 kV rms per 1 min test
Serial Protocols Modbus RTU, Modbus ASCII, Laurel ASCII
Modbus Compliance Modbus over Serial Line Specification V1.0 (2002)
Ethernet Connector RJ45 jack for 10/100 Base-T Ethernet cable
RS232/485 Connector Screw terminals for easy daisy chaining
Digital Addresses 247 for Modbus, 31 for Laurel ASCII
Dual Relay Output (standard)
Relay Type Two solid state relays, SPST, normally open, Form A
Load Rating 120 mA at 140 Vac or 180 Vdc
Power Input
Standard Power 85-264 Vac or 90-300 Vdc (DC operation not ETL certified)
Low Power Option 10-48 Vdc or 12-32 Vac
Power Frequency DC or 47-63 Hz
Power Isolation 250V rms working, 2.3 kV rms per 1 min test
Power Consumption 2W typical
Dimensions 129 x 104 x 22.5 mm case
Mounting 35 mm rail per DIN EN 50022
Electrical Connections Plug-in screw-clamp connectors
Operating Temperature 0°C to 55°C
Storage Temperature -40°C to 85°C
Relative Humidity 95% at 40°C, non-condensing
Cooling Required Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4") between transmitters, or force air with a fan.
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CTH Controls Inc.   CTH Controls Inc.
6-1500 Upper Middle Rd. W. Suite 220
Oakville, ON, Canada, L6M 0C2
Phone: 905-792-6829
Toll Free: 1-888-550-6829
Fax: 905-792-6902
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