JH1400: Single Trip Alarm
JH1420: Dual Trip Alarm
Models JH1400 and JH1420 RTD Input Alarms monitor temperature as measured by a resistance thermometer (RTD) and provide relay contact HI/LO trip outputs. Both are fixed-range devices, with input ranges preset per your order. These alarms also may be ordered with setups to monitor resistances other than RTDs
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.
Alarm contacts are rated at 5 amps, 230Vac or 30Vdc. Model JH1400 provides one set of DPDT relay contacts; Model JH1420, two SPDT relays. Three-wire input circuitry compensates for lead wire resistance. 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). Pin connections are:
Pin 1: Power (AC or, if DC power option, DC plus).
Pin 2: RTD.
Pin 3: Power (AC or, if DC power option, DC minus).
Pin 4: RTD (opposite end from Pins 2 and 5).
Pin 5: RTD compensation (same end of RTD as pin 2).
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.*