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JH1200: Thermocouple Input Single Trip Alarm
JH1220: Thermocouple Input Dual Trip Alarm
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Available
for All Thermocouple Types
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Low-Drift
Input Amplifier Jumper-Selectable
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Upscale/Downscale
Burnout
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Switch-Selectable
HI/LO Trip Function
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Adjustable
Deadband Standard
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Quick-Check
Red/Green Output LEDs
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Industry-Standard
Pinouts (11-Pin Socket)
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AC
or DC Power Options
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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.
A low-drift input amplifier plus automatic cold-junction
compensation maintain accurate setpoint settings with changing
ambient temperatures. An internal jumper allows HI or LO trip
indication upon thermocouple burnout. AC and DC power options are
available.
ORDERING INFORMATION
| Model
Number: |
Select JH1200
single-trip alarm or JH1220 dual-trip alarm. Add suffix –AC
for AC power or –DC for DC power. |
| Thermocouple
Type: |
Specify type J,
K, T, E, R, S, B or N, or contact factory for others. |
| Input
Range: |
Specify any input
range corresponding to 4mV or higher span. (4mV equals 100
deg. C for type K thermocouples.). |
| T/C
Burnout Indication: |
Specify upscale
(high) or downscale (low) burnout indication. Will be set
for upscale if not specified on your order. |
| Trip
Points: |
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").
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| Power:
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Specify 115Vac, 230Vac, 12Vdc or 24Vdc.
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| Relay
Action: |
Standard is Failsafe - the relay is energized under normal
conditions and de-energizes 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.
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INSTALLATION AND CONNECTIONS
These alarms plug into any standard 11-pin
circular ("octal") relay socket. JH Technology offers two
sockets: DS011 for DIN-rail or surface mounting and ST011 for
Snap-Track® 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.*
(*) Note: 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 non-alarm
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
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Thermocouple
Type:
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Any standard thermocouple type (J, K,
T, E, R, S, B, N). Others possible – contact factory.
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Input
Capabilities:
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Any input span 4mV or higher.
Offset ranges are allowed. |
| T/C
Burnout Indication: |
Jumper-selectable upscale (offscale
high) or downscale (offscale low). Factory set for upscale
unless otherwise specified. |
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Relay
Contacts:
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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.
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Setpoint
Adjustment:
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0% to 100% of range.
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Deadband
Adjustment:
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0.25% to 100% of range.
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Response
Time:
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Under 100 milliseconds.
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Isolation:
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Power, 1,500Vac rms (2,100V peak).
Input/Output, 1,000Vac rms (1,400V peak).
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Guaranteed
Operating Temperature:
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-10 to +60 deg. C (14 to 140 deg. F).
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Temperature
Stability:
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+/-0.02% of span per deg. C, or
better.
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Power
Requirements:
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AC, 115 or 230Vrms, 50/60Hz, 2.5V-A.
DC, 12 or 24V, 2.5W.
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