Aquametrix SHARK-120/240 Controllers User Manual User Manual

Page 15

MULTI-PARAMETER CONTROLLER & ANALYZER USER’S MANUAL

Section 3 - Electrical Connections and Setup

Section 3 - Electrical Connections and Setup

Page 13

3.9 ALARM RELAY Setup

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The third relay (Relay C) is used as an alarm relay.
The alarm relay on the SHARK is a SPDT dry con-
tact relay.

This relay will respond to both a rising and falling
process. The alarm relay will act as a low alarm
(falling process) and a high alarm (rising process).
Both relays will have independently adjustable on
and off set-points. The ALARM ON set-points will
always be set before the ALARM OFF set-points.
The shark will not let the user input a value below
the ALARM ON set-point. The same rule holds
true for the high alarm.

The control relays have 5 user configurable set-
tings:

ALARM LOW ON set-point: This is the low process
value that will cause the relay to energize. This
value can be set anywhere between 0-100% of the
range.

ALARM LOW OFF set-point: This is the value that
the process must reach in order to de-energize the
alarm relay after it has dropped below the ALARM
LOW ON set-point. This value must be higher than
the ALARM LOW ON set-point.

ALARM HIGH ON set-point: This is the process
value that will cause the relay to energize. This
value can be set anywhere between 0-100% of the
range.

ALARM HIGH OFF set-point: This is the value that
the process must reach in order to de-energize the
alarm relay after it has increased over the ALARM
HIGH ON set-point. This value must be lower than
the ALARM HIGH ON set-point.

FAILSAFE: This option can be turned on or off. It
reverses the normal action of the relay. (see
description under control relay)

ALARM SET-POINT ERROR: If the ALARM LOW
ON set-point is set higher than the factory default
ALARM LOW OFF set-point, when the user
advances from the ALARM LOW ON set-point to
the ALARM LOW OFF set-point the shark will
adjust the ALARM LOW OFF set-point to be equal
to the ALARM LOW ON set-point. If the user then
tries to decrease the ALARM LOW OFF set-point
the Shark will display the ALARM LOW ALARM
setup error screen.

This screen will be displayed for 10 seconds, then
return back to the setup screen that was previous-
ly displayed. If the user presses the down key
again the error message will be displayed again
for 10 seconds. The user must accept the LOW
OFF set-point, equal to, or greater than the LOW
ON set-point.

The same conditions apply to the ALARM HIGH
set-points. Except the ALARM HIGH OFF set-
point must be lower than the ALARM HIGH ON
set-point. If the user tries to increase the ALARM
HIGH OFF set-point higher than the ALARM HIGH
ON set-point the High Alarm setup error screen
will be displayed.

ALARM RELAY DISABLE: If the user sets the
ALARM LOW ON set-point and the ALARM LOW
OFF set-point equal to 0% of the range. It will dis-
able the low alarm relay.

If the user sets the ALARM HIGH ON set-point
and the ALARM HIGH OFF set-point equal to
100% of the range. It will disable the high alarm
relay.