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ISO

Cynergy3 Components Ltd.

7 Cobham Road

Ferndown Industrial Estate

Wimborne, Dorset

21 7

BH

PE

SC20ALMDC 2018

Telephone +44 (0) 1202 897969

Email:sales@cynergy3.com

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