Isolating Terminal Blocks 420TW The 420TW range of DIN-rail terminals provide input isolation and signal conversion ■ Voltage, current and thermocouple inputs ■ RFI protection, input isolation ■ Replace standard DIN-rail terminals ■ Simple 2 wire connection ■ High noise immunity ■ Low cost solution Options and ordering codes 420TW HL-A A XX – 9 PRICE INFORMATION AND ORDERING Input 1-5 Volts 420TW HL-F 0-10 Volts 420TW HL-G Thermocouple 420TW TC-J ▲ RTD Wiring diagram 420TW RTD-J 4-20mA 0-10V T/C 4-20mA ▲ Dimensions and connections 63mm ▲ The 420TW series of isolating terminal blocks can replace standard DIN-rail terminals to provide input isolation and signal conversion. The units are powered from the output side, making them ideal for PLC and data acquisition applications. Inputs available include thermocouple, RTD, current and voltage and the standard output is 4-20mA. For thermocouple inputs, internal rotary switches allow the user to select virtually any type of thermocouple and the temperature range required. A typical wiring arrangement is shown opposite. The device is housed in an ultra-compact DIN-rail mounted enclosure only 18mm wide. 24V ▲ Description ▲ 420TW HL-E ▲ 1 2 58mm 0-5 Volts ▲ 420TW HL-A 1. 2. 3. 4. Output Ch +ve Output Ch -ve Input Ch +ve Input Ch -ve ▲ 4-20mA ▲ 18mm Input types The 420TW device can accept J, K, T, R, S, E and N type thermocouples. The RTD input accepts a PT100 2 wire sensor. 3 4 ▲ Specifications Parameter Supply voltage Input current Full scale volt drop Input impedance (volt in) Input impedance (mA in) Output linearity error Temp coefficient Load resistance error Time constant (10-90%) Operating ambient Relative humidity Isolation voltage Surge voltage Notes Min 11V 0mA Typ 24V 0-20mA 0.2V 1MΩ 10Ω ±0.1% Max 32V 29mA 0.3V 100ppm/˚C ±5ppm/Ω 30ms -15˚C 0% 1kV Comments Powered from output side On input side (20mA input) Voltage input mA input 0<RL <600Ω 300ms for thermocouple input 70˚C 90% 2.5kV for 50µS Transient of 10kV/µS Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur Device is protected against reverse polarity connection Accuracy figures based on 0-20mA input, 250Ω load resistance, and an ambient temperature of 20˚C