JH1500: Single Trip Alarm
JH1520: Dual Trip Alarm
Models JH1500 and JH1520 supply DC excitation to a strain gauge or other resistance bridge, amplify the bridge output 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). Alarm contacts are rated at 5 amps, 230Vac or 30Vdc. Model JH1520 (dual trip) provides an SPST relay contact for Setpoint #1, SPDT for Setpoint #2. On Model JH1500 (single trip) both sets of contacts respond to the single setpoint.
Red/green LEDs indicate alarm status. A low-drift input amplifier maintains accurate setpoint settings with changing ambient temperature. 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). Please note – due to limitations on the total number of pins, the relay connections are different from other JH Technology plug-in alarm modules. Pin connections are:
Pin 1: Power (AC or, if DC power option, DC plus).
Pin 2: Setpoint 1 relay moving contact.*
Pin 3: Power (AC or, if DC power option, DC minus).
Pin 4: Input plus (bridge output).
Pin 5: Input minus (bridge output).
Pin 6: Setpoint 1 relay NO contact.*
Pin 7: Bridge excitation plus.
Pin 8: Bridge excitation minus.
Pin 9: Setpoint 2 relay NO contact.*
Pin 10: Setpoint 2 relay moving contact.*
Pin 11: Setpoint 2 relay NC contact.*