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Summary

General Operation

Suitable For

Ref. Number

Sensor Validation

Produces a 4-20 mA output proportional to average of two sensor inputs as long as both sensors are in bounds. If either sensor goes out of bounds it is rejected and the output then becomes proportional to the ‘good’ sensor. A relay contact is set to annunciate the sensor failure which can be changed at the next scheduled maintenance.

MED2213

02011111
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General pulse totalizer

PV is taken as a flow rate. Output 2, relay A is pulsed for a user-configurable time when the integrated total reaches a user-configurable value.

MED2113, MED2122, MED2133

02011011
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Rate of change limiter

Operates as a standard transmitters but limits the maximum rate of change of the output to a user defined value.

MED2113

02010921
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Peak/Valley Pick & Hold

Provides a display an analog O/P proportional to either the peak or valley input which is reset by an external digital. The peak/valley also decays as a rate defined in TFML3.

MED2213

02010911
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Pulse Totalizer

Takes 0-10V DC input equivalent to 0-400m3 hr and provide 2 outputs. Output 1 4-20mA = 0-400m3 hr, output 2 relay 1 high alarm, relay 2 pulse per total. For pulse output, relay ‘on’ time = 100ms.

MED2113

02010211
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PI control – Relay Output

This is the conventional PI control whereby a control signal is derived which is proportional to the error and the integral of the error. The output is sent to the proportioning relay output
The setpoint, P&I constants and the relay cycle time are entered via TFNL registers.
Anti-windup is included i.e. the integral is reset to Zero whenever the error is outside the proportional band.

MED2133

02010711
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PID - 3 term control - continuous

This is the conventional PID control whereby a control signal is derived which is proportional to the error, the integral of the error and the derivative of the error. The setpoint and PID constants are entered via TFNL registers.
Anti-windup is included i.e. the integral is reset to Zero whenever the error is outside the proportional band.

MED2113

02010311
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A-B

Provides an analog output proportional to the difference between the two inputs.

MED2211

01120411
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A+B
or Average

Provides an output equal to the sum or average of both inputs (or some other sub-multiple of the sum).
Both inputs are summed together and divided by TFML1, The output is then scaled according to TFML2 and TFML3 and sent to the 4-20mA output.

MED2211, MED2213

01120421
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Sample and Hold

4-20mA output related to input, the digital input initiates the hold, and the digital output is used as an alarm.

MED2113

01120611
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High Input Selector

This module takes two inputs and produces a 4-20 mA output proportional to the highest of the two inputs.
Sensor A and B are set up in the normal way. The difference between the highest is selected and output from Channel 1 as an analog signal, 4-20 mA ranges from TFML1 to TFML2.
Channel 2 output remains operational on channel 2 input as standard.

MED2213, MED2211

01120512
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