2 alarm relays programming, 1 trouble alarms, 2 set point alarms – Hach 900 MAX User Manual

Page 93: 1 trouble alarms 6.4.2.2 set point alarms

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Section 6

Page 91

8990cm.fm

Alarm Relays

Figure 27

Single Relay Wiring Inside the Relay Junction Box

6.4.2 Alarm Relays Programming

Program alarms activate based on certain conditions (low battery, low
memory, etc.). When an alarm is tripped, an action is initiated (report via
modem, dial a pager, or set a relay). There are two types of alarms: Trouble
Alarms and Set Point Alarms.

6.4.2.1 Trouble Alarms

Trouble Alarms initiate an action when a trouble condition occurs. For
example, a relay may close when the memory is full. Refer to

Troubleshooting

and Error Messages on page 127

for more information on trouble alarms.

1.

From the Main Menu, select

SETUP > ADVANCED OPTIONS > ALARMS.

2.

Select one of the trouble conditions.

3.

Select an action to occur when the alarm is activated. The table below
lists each Trouble Condition. Refer to

Appendix C on page 127

for causes

and solutions.

6.4.2.2 Set Point Alarms

Set Point Alarms look for trip points to be reached (either high or low or both)
before initiating an action. For example an initiated action may be the closing
of a relay when the water level exceeds 60 cm (24 in.) or drops below 10 cm
(4 in.) Set Point Alarms activate when a user-definable high and/or low set
point is reached.

Trouble Conditions:

Low Main Battery

Memory Battery

Low Slate Memory

Slate Memory Full

Modem Failure

Missed Sample

Purge Failure

Jammed Distributor

RS485 Timed Out

Alarm Actions:

Set Relay #1

Set Relay #2

Set Relay #3

Set Relay #4

Report Via Modem

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