20ALMDC-AXXX-8

## Loop Powered Trip Amplifiers 20ALM 

The 20ALM is an input loop powered trip amplifier, deriving its power from the input signal 

- ❚ High or low alarm option 

- ❚ Low voltage drop 

- ❚ Setpoints available on front panel as 0.4 to 2V signal (4 to 20mA) 

- ❚ LED indication of alarm 

- ❚ Unique low cost solution 

## **Options and ordering codes** 

## **Description** 

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. 

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20ALM - 115VAC - AXXX - 8<br>Options<br>115VAC rated contacts 115VAC<br>24VAC/DC rated contacts DC<br>**----- End of picture text -----**<br>


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. 

## **Dimensions** (mm) 

The device is housed in an ultra-compact DIN-Rail mounted enclosure, only 

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63mm<br>18mm wide.<br>L<br>1 2 Recommended operating conditions<br>Input current 4-20mA<br>Relay contact voltage 24Vac/dc or 110Vac<br>Relay current (max) 300mA @ 24Vdc – 130mA @ 110Vac<br>Output resistance 5 Ω (on) 24V type – 24 Ω on 110Vac type<br>Environmental conditions<br>| Storage temperature -40-70˚C<br>L 3 4 Operating ambient 0-55˚C<br>Relative humidity 0-90% RH<br>lo<br>tT d eze : es<br>Connection details 4-20mA 1<br>3<br>1. Relay output -ve 3. Input channel +ve L<br>2. Relay output +ve 4. Input channel -ve N.O. or N.C. solid<br>L L<br>58mm<br>18mm<br>L<br>L<br>L<br>**----- End of picture text -----**<br>


## **Specification** 

**Parameter Min Typ Max Comments** Supply voltage ee Loop power Supply current 4mA 20mA ~~ReGC~~ Full scale volt drop ~~GG~~ 3.4V 3.5V At 20mA input Relay type 1 current ~~a~~ 315mA Rated at 24Vdc/ac Relay type 2 current ~~Re~~ 130mA Rated at 110Vac Output resistance ‘ON’ ~~a~~ 5 Ω /24 Ω 24V/110Vac relay type Setpoint hysteresis ~~ee~~ 50µA Other values available Trip point accuracy ±0.25% ~~ReGC~~ Temperature coefficient ~~GG~~ ±100ppm/˚C Trip point drift ~~a~~ ±100ppm/˚C Relay time response ~~Re~~ 10ms Operating ambient ~~a~~ 0˚C 55˚C Relative humidity ~~ee~~ 0% 90% Isolation voltage ~~GG~~ 1kV Surge voltage ~~CO~~ 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 (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. 

4-20mA 1 3 L N.O. or N.C. solid 3.4V state relay output 4 2 

www.imopc.com 

20ALM/03/03