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ATI A15/76 Turbidity Monitor Part 5 – Configuration

O&M Manual

Rev-H (8/11)

8. Small S RT: 120s This routine sets the damping value for small changes in turbidity values. The

value for this damping factor is set at a fairly high value to eliminate fluctuations in the reading

caused by occasional bubbles or other sample anomalies. As with #7 above, this setting can be

adjusted between 5 seconds and 220 seconds to provide the desired damping of small changes.

9. CHECK SIGNAL: ON The A15/76 contains software routines that monitor the condition of the

sensor. This “check signal” system can provide an alarm if the sensor becomes too dirty to allow

accurate measurement or if the ambient light (in a submersion application) is too high to allow for

low level measurements. In addition, the “check signal” system will warn of loss of water in the

flowcell that would result in faulty readings. This function is normally ON, but can be disabled if

this feature adversely affects a particular application.

10. CAL OUT1: 0/4-20: This routine allows output #1 to be configured as either a 0-20 mA or 4-20

mA output. Select using the UP or DOWN keys and then press ENTER.

11. CAL P1: X.XXX NTU Analog outputs are adjusted to an overall operating range, such as 0-1.000

NTU or 0-0.500 NTU. The CAL P1 routine allows assignment of the zero value for the output.

Normally, this value will be 0. However, you can offset the 4 mA point if desired by using the UP

key. Press ENTER when the proper value has been selected.

12. CAL P2: XX.XX NTU: The CAL P2 routine allows assignment of the full-scale value for the

output. For a turbidity output, this would be the 20 mA value for the output, such as 1.000 for a

range of 0-1.000 NTU. Press ENTER when the proper value has been selected.

13. SET A F.: LO (OR HI) This routine allows the function of setpoint A to be defined as either low

or high. When LO is selected, relay A acts like a low alarm, with the relay activating when the

measured turbidity is below the setpoint. When HI is selected, the relay acts like a high alarm,

activating when the measured value is above the setpoint. Setpoints are programmed in another

routine described later in this manual.

14. SET B F.: LO (OR HI) This routine allows the function of setpoint B to be defined as either low

or high similar to relay A described in #13 above.

15. AL SET A: OFF A separate alarm relay is provided in the monitor which is independent of relays

A and B. It is marked C on the back of the instrument. This relay can be used to actuate an

emergency alarm should the turbidity value remain outside of the A setpoint for some fixed period

of time. The default for this function is off. If you want to use this function, use the UP key to

select ON and then press ENTER. The display will change to "TIME SET A: 60 M". Use the UP

or DOWN key to select the time period after which you want the C/D relay to actuate.

16. AL SET B: OFF This routine is similar to #13 above, but with respect to relay B. It associates

the alarm relay with the operation of relay B as described above.

17. EXT LIGHT AL: OFF The A15/76 turbidity monitor can detect when external light conditions are

too high to allow for accurate readings. This is especially important when measuring very low

turbidity values. This routine activates or deactivates this alarm feature. When measuring in a

flowcell, external light is rarely a problem. However, it can be a problem when measuring using a

submersible sensor.

18. AL RELAY: ACT This is a factory setting and should not be changed.

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