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ATI A15/76 Turbidity Monitor Part 6 – Operation

O&M Manual

Rev-H (8/11)

Controls & Alarm Outputs

The A15/76 Turbidity Monitor is equipped with three relay outputs. Two of these outputs are

designated control relays and the third is designated as an alarm relay. These output relays may be used

in a variety of ways, and the function of each relay is programmable by the operator. Relay output wiring

is made at the rear of the monitor as shown in the diagram on page 14.

Control Relays

The relays designated control relays may be used for either alarm functions or control functions.

Each of the two relays is SPDT with a 220 VAC 5A resistive contact rating. Each control relay can be

programmed as either a high or a low alarm, and the hysteresis and time delay can also be set.

To program control relays, proceed as follows:

1. Press the MODE key until SA appears on the left side of the display. The full display will indicate

"SA X.XXmS oLO" This refers to setpoint A and indicates the current setting for control relay A.

X.XX is the current setpoint, o(or n) indicates the current status of the relay, and LO(or HI)

indicates a low or high alarm function.

2. Press the CAL key once and the display will read "CAL SA S: X.XX". The value of X.XX is the

setpoint for that relay. Use the UP and DOWN keys to adjust the value to the desired setpoint.

Then press the ENTER key.

3. The display will now read "CAL SA I: 0.00". I is the setpoint hysteresis or deadband for that relay.

Use the UP and DOWN keys to adjust the deadband to the desired value. A value of at least

0.2% of display range is recommended to avoid relay cycling at the actuation point. The

maximum setting is 10% of the display range selected in configuration. When the value is set,

press the ENTER key.

4. The display will now read "CAL SA D: 0.0s". D is the delay time for relay actuation. Use the UP

and DOWN keys to select the desired delay time in seconds. The maximum delay time is 99.9

seconds. When the selection is made, press the ENTER key.

5. The display will return to the original "SA X.XXmS oLO". Press the MODE key to access the "SB

X.XXmS oLO" display.

6. The steps outlined in 1-4 above should be repeated for SB to program operation of relay B.

Alarm Relay

The Turbidity Monitor also contains a relay designated as an alarm relay. This relay may be used

to warn of various conditions that might indicate operational problems. The relay will activate on either

high or low turbidity conditions, and can be used to indicate failure of the control relays to maintain proper

control. This relay is designated "C" on the wiring schematic, and the function of the relay with respect to

its association with relays A and B is covered in the Configuration section of this manual.

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Analytical Technology A15 Specifiche Pagina 27