JH1200: Single Trip Alarm
JH1220: Dual Trip Alarm
Models JH1200 and JH1220 Thermocouple Alarms monitor temperature as measured by a thermocouple and provide relay contact HI/LO trip outputs. Both are fixed-range devices, with input ranges preset per your order.
The alarm trip points are adjustable anywhere within the input range. Deadbands also are fully adjustable, from 0.25% to 100% of span. A slide switch, accessible through the top of the enclosure, selects HI or LO trip operation (on dual alarms, HI/HI, HI/LO or LO/LO). Red/green LEDs indicate alarm status. Model JH1200 provides one set of DPDT relay contacts; Model JH1220, two SPDT relays. Alarm contacts are rated at 5 amps, 230Vac or 30Vdc.
The cold junction sensor is encapsulated into the input terminals for maximum accuracy. A low-drift input amplifier maintains accurate setpoints with changing ambient temperatures. An internal jumper allows HI or LO trip indication upon thermocouple burnout. AC and DC power options are available.
Specify Option "U"
These alarms plug into any standard 11-pin circular ("octal") relay socket. JH Technology offers a socket suitable for DIN-rail or surface mounting (see the Accessories page).
The thermocouple connects to a small terminal block (which also contains cold junction compensation) on the side of the module. The remaining pin connections are:
Pin 1: Power (AC or, if DC power option, DC plus).
Pin 2: No connection.
Pin 3: Power (AC or, if DC power option, DC minus).
Pin 4: No connection.
Pin 5: No connection.
Pin 6: Setpoint 1 relay NO contact.*
Pin 7: Setpoint 1 relay moving contact.*
Pin 8: Setpoint 1 relay NC contact.*
Pin 9: Setpoint 2 relay NO contact.*
Pin 10: Setpoint 2 relay moving contact.*
Pin 11: Setpoint 2 relay NC contact.*