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JH1500: Strain Gauge Input Single Trip Alarm
JH1520: Strain Gauge Input Dual Trip Alarm
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Input
Spans as low as 0.4mV/V (at 10V excitation)
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Excitation
Adjustable from 4 to 12V
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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 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.
ORDERING INFORMATION
| Model
Number: |
Select JH1500
single-trip alarm or JH1520 dual-trip alarm. Add suffix
–AC for AC power or –DC for DC power. |
| Bridge
Excitation: |
Specify any
voltage between 4 and 12Vdc. Will be factory set to 10V if
not specified on your order. User-adjustable. (Note: 40mA
maximum load. For 120ohm bridges, specify 4.8V or less.) |
| Input
Range: |
Specify any
input range allowed by the "Input Capabilities"
spec, below. Specify either as millivolts per volt, or as
millivolts. (Millivolts equals millivolts-per-volt
multiplied by the excitation voltage. For example, 0-2.0
mV/V at 10V excitation equals 0-20mV.) |
| 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).
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.*
(*) 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 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. The Setpoint 1 relay contacts are SPST, NO
(open upon loss of power). Setpoint 2 has an SPDT relay.
DETAILED SPECIFICATIONS
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Input
Capabilities:
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4mV minimum span (0.4mV/V at 10V
excitation). 10V maximum span (1V/V at 10V excitation).
Offset ranges are allowed. (Input Impedance: 200kohms.)
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Excitation
Voltage:
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Adjustable from 4 to 12Vdc.
40mA maximum load. Factory set to 10Vdc unless otherwise
specified. (Note: 120 ohm bridges limited to 4.8V or less.
350 ohm bridges are ok to 12V.) |
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Relay
Function,
Single Trip Alarm (Model JH1500):
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One set of SPST contacts, normally
open (open upon loss of power), and one set of SPDT
contacts.
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Relay
Function,
Dual Alarm
(Model JH1520): |
Setpoint 1, SPST, normally
open (open upon loss of power). Setpoint 2, SPDT relay. |
| Relay
Contacts: |
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 plus 1.3 microvolts)
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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