Boiler and Cooling Tower pH Portable Meter - HI99141


Boiler and Cooling Tower pH Portable Meter - HI99141



The HI99141 meter features a large multi level LCD screen which displays both pH and temperature readings simultaneously with 0.01 pH resolution and an accuracy of ±0.02 pH. The LCD screen also has indicators for calibration status and stability, as well as on-screen tutorial messages. The HI99141 has many advanced features that are found in more expensive portable instrumentation including automatic calibration, buffer recognition,and temperature compensation. The battery percent level is displayed at start up alerting the user to the remaining battery power that is available.

The HI99141 is supplied with the amplified titanium body pH/temperature electrode. The titanium body is resistant to many aggressive chemicals and extremely durable.The titanium body acts as a matching pin for the flat tip pH electrode. A matching pin is a differential measurement technique used to eliminate electrical noise in a pH measurement system. The matching pin coupled with a pre-amplifier provides for an increased response time in pH measurement and extends the electrode life.

The HI729113 also features a large annular polytetrafluoroethylene (PTFE) junction. This large junction is resistant to chemicals but has a large surface area allowing for maximum diffusion of ions from the inside of the reference electrode into the sample resulting in a fast, stable reading. The flat tip pH electrode with a PTFE junction in a titanium body make the HI729113 ideal for the water treatment industry.

pH meter for boilers and cooling towers

Maintenance free gel filled electrode

Unbreakable titanium body

Titanium construction provides an unbreakable structure and allows the transfer of heat to the internal temperature sensor for rapid temperature compensation.

Maintenance free gel filled electrode

Maintenance free, gel-filled electrode

No fill solution required.


Features at-a-glance

  • Automatic Temperature Compensation
  • One or two-oint automatic calibration
  • BEPS - Alerts the user of low battery power that could adversely affect readings
  • Compact, heavy-duty, and waterproof
  • Battery % displayed on start-up
  • HELP feature displays tutorial messages on LCD
pH Range -2.00 to 16.00 pH; -2.0 to 16.0 pH
pH Resolution 0.01 pH; 0.1 pH
pH Accuracy ±0.02 pH; ±0.1 pH
pH Calibration automatic, at one or two points with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
pH Temperature Compensation automatic ‐5.0 to 105.0 °C/23.0 to 221.0 °F
pH CAL Check (electrode diagnostics) probe condition indicator
mV Range ±825 mV (pH‐mV)
mV Resolution 1 mV (pH‐mV)
mV Accuracy ±1 mV (pH‐mV)
Temperature Range -5.0 to 105.0°C / 23.0 to 221.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy ±0.5°C (up to 60°C); ±1.0°C (outside) / ±1°F (up to 140°F); ±2.0°F (outside)
pH Electrode HI729113 titanium body, pre-amplified pH electrode with internal temperature sensor, quick connect DIN connector and 1 m (3.3’ cable) (included)
Automatic Shut-Off user selectable: after 8 min, 60 min or disabled
Battery Type/Life 1.5V (3) AAA / approximately 1400 hours of continuous use
IP Protection IP67
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
Weight 196 g (6.91 oz.)
Ordering Information HI99141 is supplied with HI729113 pH probe, HI70004 pH 4.01 buffer solution sachet (1), HI70007 pH 7.01 buffer solution sachet (1), HI700601 electrode cleaning solution sachets (2), batteries, 100 mL beaker (1), instructions, calibration certificates for meter and probe, and rugged thermoformed carrying case.


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