MODEL TCL

SECTION 7

 

PROGRAMMING THE ANALYZER

7.3 CONFIGURING, RANGING, AND SIMULATING OUTPUTS.

7.3.1 Purpose

This section describes how to configure, range, and simulate the two analog current outputs. CONFIGURE THE

OUTPUTS FIRST.

1.Configuring an output means…

a.Assigning a sensor and measurement (chlorine or temperature) to an output.

b.Selecting a 4-20 mA or 0-20 mA output.

c.Choosing a linear or logarithmic output.

d.Turning output current dampening on or off.

e.Selecting the value the output current goes to if the analyzer detects a fault.

2.Ranging the outputs means assigning values to the low (0 or 4 mA) and high (20 mA) outputs.

3.Simulating an output means making the analyzer generate an output current equal to the value entered by the user.

7.3.2 Definitions

1.ANALOG CURRENT OUTPUT. The analyzer provides either a continuous 4-20 mA or 0-20 mA output signal proportional to chlorine or temperature.

2.ASSIGNING AN OUTPUT. Outputs can be assigned to either the measurement (total chlorine) or temperature. If a dual input analyzer is being used, the outputs are freely assignable to either sensor.

3.LINEAR OUTPUT. Linear output means the current is directly proportional to the value of the variable assigned to the output (chlorine or temperature).

4.LOGARITHMIC OUTPUT. Logarithmic output means the current is directly proportional to the common logarithm of the variable assigned to the output (chlorine or temperature).

5.DAMPENING. Output dampening smoothes out noisy readings. It also increases response time. The time selected for output dampening is the time to reach 63% of the final reading following a step change. Output dampening does not affect the response time of the display.

6.FAULT. The analyzer continuously monitors itself and the sensor(s) for faults. If the analyzer detects a fault, a fault message appears in the main display. At the same time the output current goes to the value programmed in this section. There are two output fault modes: fixed and live. Fixed means the selected output goes the previously programmed value (between 0.00 and 22.00 mA) when a fault occurs. Live means the selected output is unaffected when a fault occurs.

7.RANGING AN OUTPUT. The outputs are fully rangeable, including negative numbers. If the output is logarithmic, assigned values must be positive.

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Emerson TCL instruction manual CONFIGURING, RANGING, and Simulating Outputs, Outputs First, Definitions
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TCL specifications

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