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ATI A15/66 Residual Sulfite Monitor

O&M Manual

Rev-W (8/10)

CONTROL & ALARM OUTPUTS

The A15/66 Sulfite Monitor is equipped with two SPDT alarm/control relays, two SPST relays

designated for sample system cleaning, and an isolated 4-20 mA output. The alarm/control 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 12. A separate section

in this manual describes the use of the cleaning control relays.

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. Control relays can be used in

one of 3 different output modes, on/off, pulse width modulation, and pulse frequency modulation. The

on/off mode of operation is standard and is the mode used for simple control or for alarm purposes.

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

XX.XXPPM O L" This refers to setpoint A and indicates the current setting for control relay A.

XX.XX is the current setpoint, O indicates ON/OFF operation, (or ) indicates the current status of

the relay, and L(or H) indicates a low or high alarm function. The function of this relay as a low or

high alarm is programmed as described in item 15 in the CONFIGURATION section.

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 0.03 is

recommended to avoid relay cycling at the actuation point. The maximum setting is 1.00 PPM.

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 25 seconds.

When the selection is made, press the ENTER key.

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

NOTE: Alarm relays may be activated or deactivated manually by placing the monitor into SIM

mode as described on page 21 under OPERATING MODE. Once alarm setpoints have

been programmed, the proper relay function can be verified by simulating values either

above or below alarm setpoints.

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Analytical Technology A15 Dokumentacja Strona 29