Halogen MP5A, Operation & Maintenance Manual, Page: 26 / 45

MP5A Operation and Maintenance Manual
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Copyright © 2023 ‐ 2024 Halogen Systems, Inc. All rights reserved worldwide.
Rev.: 4.02
26
Legend for display locations Page 2
pH Signal
pH Reference Signal
Sensor Serial Number
Number of Hours of Operation

Sensor Serial Number is helpful when requesting technical support.

Hours of operation is an indication of when wear parts need to be replaced.
8.7. Problems not resulting in an Error Code
8.7.1 Measured water or sensor reading is fluctuating and it is difficult to calibrate sensor

Put sensor in a bucket with sampled water.

Take a grab sample and calibrate the sensor.

Calibrate the sensor and replace into process.
8.7.2 Chlorine and or pH reading is erratic
This is often caused by air. To check the sensor operation, place it is a bucket with sampled water and determine in
the value measured is stable over several measurements. If so, then the problem is likely the installation. Air may
be present in the sampling stream, or the sensor orientation may be wrong.
Sensor is covered by brown slime or other contaminants
Clean sensor using one of the two methods described in the Maintenance Section in the Appendix.
8.7.3 PLC input does not match the output of the Display
See the Section on Calibration of the 4 ‐ 20 mA Output in the Appendix.
8.7.4 Immersed sensor is installed in a basin which is drained periodically
Sensor Operation can be stopped without powering off by using the STOP Function below:
8.7.5 Stop Function

A STOP command will halt measurement until the system is restored.

Pressing MENU and BACK at the same time will enable the STOP cycle.

Repeating the sequence will restart the cycle.
9. Section Replacement Parts and Accessories
Wear Part Replacement
Quantity PN Description Frequency
1 WP ‐ NH Wear Part Replacement Kit including:
12 Months
1 NCAP ‐ 0001 Sensor End Cover Assembly
1 IMPA ‐ 0001 Impeller
2 CLBL ‐ 0001 Bag of 15x 1/8" Acrylic cleaning beads
1 MTRR ‐ 0001 Motor Wear Ring
2 FSTR ‐ 0005 Sensor Cover Screws: No. 4 5/8" 316 SS Self Tapping Phillips
1
KITS ‐ 0001
pH Sensor Replacement Kit including:
12 Months
1
PHSA ‐ 0001
pH Reference Electrode Assembly
1
TOOL ‐ 0001
Tool ‐ pH sensor removal
1
ORNG ‐ 0004
O ‐ ring ‐ #12 NSF61, EPDM, ID: 9.25 mm, CS: 1.78 mm