Sunday, 05 June 2011 22:57 Last Updated on Monday, 29 August 2011 02:00 Written by Administrator

RTD INPUT PLUG-IN ALARM MODULES

JH1400: Single Trip Alarm
JH1420: Dual Trip Alarm
  • 3-Wire Lead Resistance Compensation
  • Platinum, Nickel and other RTDs
  • Switch-Selectable HI/LO Trip Function
  • Adjustable Deadband Standard
  • Uses Standard 11-Pin Socket
  • AC or DC Power Options

JH1400/JH1420
PDF
DATA SHEET

JH1400
PDF
MANUAL

JH1420
PDF
MANUAL

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.

ORDERING INFORMATION

Model Number:  Select JH1400 single-trip alarm or JH1420 dual-trip alarm. Add suffix –AC for AC power or –DC for DC power.
RTD:  Specify any standard RTD type between 10 and 2,000 ohms, or provide details for nonstandard RTD or resistance input.
Input Range:  Specify any range allowed by the "Input Capabilities" spec, below.
Trip Point:  If you would like the trip points to be factory set, please specify the following for each trip point. Specify HI or LO trip, specify the setpoint and specify the amount of deadband required (or specify "minimum deadband").
Relay Action:  Standard is Failsafe - the relay is energized under normal conditions and deenergizes upon alarm or upon loss of power. Thus, loss of power is seen as an alarm condition. Or specify Option R (Reverse Acting) – relay is normally not energized and energizes (pulls in) upon alarm trip. Failsafe is provided if not specified.
Power:  Specify 115Vac, 230Vac, 12Vdc or 24Vdc.
Urethane Coating:  

Specify Option "U"

INSTALLATION AND CONNECTIONS

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.*

  • Notes: NO (normally open) and NC (normally closed) refer to the relay state when no power is applied. For Failsafe operation the NO contacts are closed under nonalarm conditions. The NC contacts close upon alarm and upon loss of power. The terms Setpoint 1 and Setpoint 2 refer to dual-trip alarms. For single-trip alarms, both sets of contacts respond to the one trip point.

DETAILED SPECIFICATIONS

RTD Type:  Any RTD from 10 to 2,000 ohms. 3-wire connection (can also be connected as 2-wire). Specify RTD type, slope and resistance, or provide details for nonstandard RTD. Contact factory for other types of resistance inputs.
Input Capabilities:  Minimum span 10 deg C (18 deg F) or 1 ohm, whichever is greater. Any range up to maximum covered by RTD. Offset ranges are allowed.
Relay Contacts:  Single Alarm, one DPDT relay. Dual Alarm, two SPDT relays. Contacts rated 5 Amps resistive, 115/230Vac or 30Vdc. 1/8 HP max inductive load at 115/230Vac. Refer to instructions for contact protection when switching inductive loads.
Setpoint Adjustment:  0% to 100% of range.
Deadband Adjustment:  0.25% to 100% of range.
Response Time:  under 100 milliseconds.
Isolation:  Input is isolated from power and from relay contacts. 1,500Vac rms (2,100V peak) breakdown.
Guaranteed Operating Temperature:  -10 to +60 deg. C (14 to 140 deg. F).
Temperature Stability:  +/-0.02% of span per deg. C, or better.
Power Requirements:  AC, 115 or 230Vrms, 50/60 Hz., 2.5V-A. DC, 12 or 24Vdc, 2.5W.