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ATI A15/76 Turbidity Monitor Part 6 – Operation

O&M Manual

Rev-H (8/11)

Auto/Manual/ Simulate Operating Mode

The A15/76 will normally operate in AUTO mode. In this mode, the monitor will display turbidity

values and indicate any alarms as described previously. However, a “Manual Mode” and a “Simulate

Mode” of operation is selectable in order to allow the user to activate the A and B relays manually for test

purposes or to manually ramp the 4-20 mA output value up and down for testing external devices.

With the LCD indicating the D1 display, press CAL and the display will indicate “CAL MODE:

AUTO”. Press the UP or DOWN key and the display will change to “CAL MODE: MAN.”. Press ENTER

and you will now be in the manual mode. In this mode, pressing the UP key will activate relay A and

pressing the DOWN key will activate relay B. To return to Auto Mode, repeat the above steps used to

select manual mode.

Simulate Mode

As previously noted, A15/76 monitors contain a mode of operation called “SIM” or simulate. This

mode of operation allows the user to adjust the turbidity value manually in order to check devices wired to

either the mA output or the alarm contacts.

To enter simulate mode, press the MODE key until the main display is on the LCD. Press CAL

once and then use the UP key to change the display to SIM. Press ENTER and the display will flash

UPDATE and the display will then read “0.000 SIM oA oB”.

Pressing the UP arrow will increase the chlorine value on the display. The 4-20 mA output will

increase as the chlorine value increases. Any recorders or remote reading devices that are connected to

the 4-20 mA output should respond to the increasing values. You can adjust the value to any number

desired. If the value you set on the display is above an alarm setpoint, the relay for that setpoint should

activate, as should any alarm or control devices wired to that relay.

Using the simulate mode of operation can be very useful in verifying operation of control or

recording systems that use this equipment. Be sure to return the monitor to AUTO mode of operation

when all simulation work is complete.

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Analytical Technology A15 Especificaciones Pagina 29