Emerson PN 51-1055pHC/rev.K specs

MODEL SOLU COMP II	SECTION 5.0
	PROGRAMMING THE ANALYZER

5.4 CONFIGURING ALARMS AND ASSIGNING SETPOINTS

5.4.1 Purpose

This section describes how to do the following:

1.assign an alarm relay to a sensor,

2.set the alarm logic to high or low,

3.assign values to the alarm setpoints,

4.set the alarm deadbands.

ALARM RELAYS MUST BE CONFIGURED BEFORE ASSIGNING SETPOINTS.

5.4.2 Definitions

1.ASSIGNING ALARMS. There are three alarms (AL1, AL2, and AL3). Alarms 1 and 2 can be assigned to any sensor. For example, AL1 and AL2 can be assigned to sensor 1 with, perhaps, one alarm configured as a high alarm and the other as a low alarm, and AL3 can be assigned to sensor 2. Alarm 3 can be assigned to either sensor or used as a fault alarm. The fault alarm activates when a fault exists in a sensor or the analyzer.

2.FAULT ALARM. A fault condition exists when the Solu Comp II detects a problem with a sensor or with the ana- lyzer that is likely to cause seriously erroneous readings. If Alarm 3 was programmed as a fault alarm, the alarm 3 relay will activate. The word Fault will appear alternately in the display with the reading.

3.ALARM LOGIC, SETPOINTS, AND DEADBANDS. See Figures 5-2 and 5-3.

FIGURE 5-2. High Alarm Logic

The alarm activates when the pH exceeds the high setpoint. The alarm remains activated until the reading drops below the value determined by the deadband.

FIGURE 5-3. Low Alarm Logic

The alarm activates when the conductivity drops below the low setpoint. The alarm remains activated until the reading increases above the value determined by the deadband.

Alarm relays are single pole-double throw (SPDT). When an alarm is activated, the coil is energized.

When an alarm activates, AL1, AL2, or AL3 (as appropriate) appears periodically in the display.

4.USP 24 ALARM. Any alarm, if assigned to sensor 2 (conductivity) can be configured as a USP 24 alarm. A USP 24 alarm activates when the non-temperature-corrected conductivity (raw conductivity) of the water is

within a user-selectable percentage (safety range) of the USP 24 limit. For example, at 40°C the USP 24 limit is 1.7 µS/cm. If the safety range is 10%, the USP 24 alarm activates when the raw conductivity exceeds 1.7 - (0.1 x 1.7) or 1.53 µS/cm.

PN 51-1055pHC/rev.K specifications

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Emerson PN 51-1055pHC/rev.K Alarm Relays Must be Configured Before Assigning Setpoints

Models: PN 51-1055pHC/rev.K