Design, Manufacture and Supply of Process Instrumentation

MEDACS COMPATIBLE TFML DOWNLOADS

Summary

General Operation

Suitable for

Ref.Number

Sensor Validation

Produces a (4 to 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 totaliser

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
Download

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 analogue 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 Totaliser

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

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
Download

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
Download

A-B

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

MED2211

01120412
Download

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 to 200 mA output.

MED2211, MED2213

01120421
Download

Sample and Hold

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

MED2113

01120611
Download

High Input Selector

This module takes two inputs and produces a (4 to 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 analogue signal, (4 to 20) mA ranges from TFNL1 to TFNL2.
Channel 2 output remains operational on channel 2 input as standard.

MED2213, MED2211

01120512
Download

Divider

The TFML takes 2 inputs; A & B. Output 1 is proportional to A/B (default) or A*B. Output 2 remains under normal operation, unaffected by TFML

MED2211, MED2213, MED2411, MED2413

03011011
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