鈥?/div>
AXXX 鈥?8
115VAC
DC
Description
The 20ALM is a 4-20mA loop powered trip amplifier. The
device derives its power from the input signal and therefore
requires no external power supply.
The output of the 20ALM is a single pole, normally open, solid state
relay which can be configured to close either above or below the
adjustable setpoint. The switched output can be connected to any
potential within 1kV of the transmitter supply, while transients of
2.5kV can be withstood.
The relay is designed to switch AC or DC.
The trip amplifier is typically used to activate a warning or control
system override when a sensor output goes above or below a pre-set
limit. Alternatively, the unit can be used for simple on/off control,
having a built in switching hysteresis.
The device is housed in an ultra-compact DIN-Rail mounted
enclosure, only 18mm wide.
v
Recommended operating conditions
Input current
4-20mA
Relay contact voltage
24Vac/dc or 110Vac
Relay current (max) 300mA @ 24Vdc 鈥?130mA @ 110Vac
Output resistance 5鈩?(on) 24V type 鈥?24鈩?on 110Vac type
Environmental conditions
Storage temperature
Operating ambient
Relative humidity
4-20mA
v
3.4V
4
N.O. or N.C. solid
state relay output
-40-70藲C
0-55藲C
0-90% RH
3
1
v
2
Dimensions
v
63mm
Specifications
v
1 2
58mm
v
18mm
3 4
Parameter
Supply voltage
Supply current
Full scale volt drop
Relay type 1 current
Relay type 2 current
Output resistance 鈥極N鈥?/div>
Setpoint hysteresis
Trip point accuracy
Temperature coefficient
Trip point drift
Relay time response
Operating ambient
Relative humidity
Isolation voltage
Surge voltage
Notes
Min
4mA
Typ
Loop power
3.4V
Max
20mA
3.5V
315mA
130mA
5鈩?24鈩?/div>
鹵0.25%
Comments
Connection details
1. Relay output -ve
2. Relay output +ve
3. Input channel +ve
4. Input channel -ve
v
v
v
50碌A(chǔ)
鹵100ppm/藲C
鹵100ppm/藲C
10ms
0藲C
0%
1kV
55藲C
90%
At 20mA input
Rated at 24Vdc/ac
Rated at 110Vac
24V/110Vac relay type
Other values available
2.5kV for 50碌S
Transient of 10kV/碌S
Setpoint is adjusted by 20 turn potentiometers on the front panel.
Setpoint can be checked by measuring the 0.4 to 2V (4 to 20mA) voltage on the
front panel terminals.
High or low alarm is selectable using internal link.
Closed output contact is indicated by a red LED on the front panel.
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