Datasheet

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ISO 9001 CERTIFIED
Cynergy3 Components Ltd.
7 Cobham Road
Ferndown Industrial Estate
Wimborne, Dorset 21 7BH PE
SC20ALMDC 2017
Telephone [phone]
Email:[e-mail]
Made in the UK
SC20ALMDC
Loop Powered Trip Amplifier
High or Low Alarm Option
Low Voltage Drop
Isolated Input Stage
Setpoints Available on Front Panel as 0.4-2V Signal (4-20mA)
LED Indication Of Alarm
Unique Low Cost Solution
The SC20ALMDC is a 4-20mA direct current
loop powered trip amplifier. The device
derives its power from the input signal and
therefore requires no external power supply.
The output of the SC20ALMDC 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.
General Specification
Recommended Operating Conditions
Input Current 4-20mA
Relay Contact Voltage 110Vac
Relay Current (max) 130mA @ 110Vac / 24Vdc
Output Resistance 24 (on) 110Vac Type
Environmental Conditions
Storage Temperature -40 - 70 ºC
Operating Ambient 0 - 55 ºC
Relative Humidity 0 - 90 % RH
Technical Specifications
Parameter Min Typ Max Comments
Supply Voltage Loop power
Supply Current (mA) 4 20
Full Scale Volt Drop 3.4V 3.5V At 20mA Input
Relay Current 130mA Rated at 110Vac
Output Resistance ‘On’ 24 110Vac Relay Type
Ω
Trip Point Accuracy 0.25%
Trip Point Drift ±100ppm/ºC
Temp Coefficient ±100ppm/ºC
Relay Time Response 10ms
Operating Ambient 0ºC 55ºC
Relative Humidity 0% 90%
Isolation Voltage 1kV
see note
Surge Voltage 2.5kV for 50µS Transient of 10kV/µS
Notes
Setpoint is adjusted by 20 turn potentiometers on the front panel.
Setpoint can be checked by measuring the 0.4 to 2V (2-20mA) voltage on the front panel
High or Low Alarm is selectable using internal link.
Closed output contact is indicated by a red LED on the front panel
Installation Data
Mounting DIN Rail TS32/35
Orientation Any
Connections Screw Clamp with pressure plate
Conductor Size 0.5-4.0mm
Insulation Stripping 12mm
Weight Approx 45g
Ordering Information
Part No.: SC20ALMDC
Connection Details
1. Relay Output -ve
2. Relay Output +ve
3. Input Channel +ve
4. Input Channel -ve