HBProducts | Safety / Leakage Detection| pH Sensor-Brine Leakage Detection

Technical data: HBPH-MK2-LT

HBPH-MK2-LT is a pH sensor designed for the extreme requirements of industrial refrigeration. It is used to measure the pH value of brine in case of an ammonia leak in a heat exchanger. Brine has a pH value of 7, and even for small leaks, the pH will rise to 9-10. The sensor is designed with differential measurement technology that ensures a minimum lifetime of 2 years for the sensor element.

The latest version HBPH-MK2-LT has an improved and protected universal flat-faced glass process electrode specially designed for tough applications.

The HBPH-MK2-LT -sensor can be used together with our “NH3/Brine leakage Display” type HBPH-C1 which is a controller used to calibrate and set up the alarm limit for the HBPH-MK2-LT sensor.

The HBPH-MK2-LT sensor comes with 3-pack salt bridge replacement kit.

HBPH-C1 can be found NH3/Brine Display Brine Leakage and Controller Brine Leakage.

Product Features

• Simple wiring with 2-wire measurement technology.
• Measurement range: 0..14 pH - 4...20 mA.
• Accurate measurement - Resolution +/-0.01Ph
• Differential measurement technology with replaceable salt bridge.
• Low maintenance costs.
• Designed with "Semi-flush" design so as to minimise the build-up of dirt on the probe.

Application

Cold Liquid Applications

If the brine temperature is below -10 to -15°C, we recommend using an additional system where a small amount brine is bypassed into a pot with a built-in heating element and thermostat controlling the temperature in a range of -5

Specification

Factory Calibration:

A standard factory calibration would guaranty the accuracy of 88% or better (usually in mid 90's) and the offset of 0.85pH of fewer for a brand new sensor.

This means that the sensor have to calibrated if you need a precise and accurate output. If you like to use the sensor for detecting ammonia leakage into fresh water of mixtures between water and ethanol/methanol/glycol a calibration is normally not needed. If you like to use the sensor in other brines with a higher pH value or in NaCl brines, we strongly recommend a calibration. The reason is that an ammonia leakage will not impact the pH value as much in these fluids, because they act as a buffer.

Using 4mA = 0pH and 20mA = 14pH, the worst case scenario (88% accuracy and max allowed offset) may equate to roughly speaking ±1.0 pH assuming no calibration is done at the installation site.

Power supply		Environmental conditions
Cable	4.5 m	Ambient temperature	-15...+50°C
Power supply	20...28 V DC	Liquid temperature	-15...+95°C (+5...+203℉)*
Output	4...20 mA, not calibrated	Measurement range	0...14 pH
Connection	2-wire	Resolution	±0.01 pH
Max load	450 ohm	Max pressure	6.9 bar @ 65°C & 2.75 bar @ 95°C
Max cable length	Depends on cable size	Protection degree	IP65
Approvals		Flowrate	Max 3.0 m/s
EMC test	EN 61000-2	Vibrations	IEC 60068-2-6 (4g)
Accessories		Mechanical specifications
3-pack salt bridge replacement kit	HBPH-2W-9-MK2-KIT	Thread connection	1" NPT
Controller for pH Sensor	HBPH-C1	Material	Ryton, ceramic, titanium, glass, viton
Controller for pH Sensor	HBPH-C1-ENC

Ordering Code

Measurement area pH	Thread type	Ordering code
0...14	1" NPT	HBPH-2W-9-MK2-LT
Accessories
3-pack salt bridge replacement kit		HBPH-2W-9-MK2-KIT
Controller for pH Sensor		HBPH-C1
Controller for pH Sensor		HBPH-C1-ENC

Download

• Instruction manual - HBPH-2W-9-MK2-LT
• HBPH Application in Brine
• pH sensors affected by grounding
• STEP file - HBPH-2W-9-MK2

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