pH-ORP-TEMP meter AD131/AD132

pH-ORP-TEMP meter AD131/AD132

ADWA AD131 and AD132: a waterproof professional meter for pH, ORP and temperature

The pH-ORP-TEMP meter AD131/AD132 is a rugged portable meter for the laboratory and industrial environment. It measures pH and sample temperature, and with a suitable ORP electrode also the redox potential in mV. The display guides the user through calibration, warns when calibration is due, and on request the meter logs up to 500 measurements.

The set includes an AD1230B pH electrode (epoxy body, BNC connector, 1 m cable), an AD7662 stainless steel temperature probe (1 m cable), calibration solutions, four AA batteries and instructions. The ORP electrode is not included in the set; it is available separately as the A3230B ORP electrode.

According to the official ADWA manufacturer's instructions it measures pH in the range from −2.00 to 16.00 with an accuracy of ±0.01 pH, mV in the range ±2000 mV and temperature from −20.0 to 120.0 °C.

pH-ORP-TEMP meter AD131/AD132

The difference between the AD131 and AD132, and calibration

The two models measure the same. In addition, the AD132 has an RS232 interface for connecting to a computer and an external printer (PRINT and PAPER keys), while the AD131 does not have these functions.

pH calibration uses seven stored buffers (1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45) and is possible with up to five points. At least two-point calibration is recommended. Dip the electrode and probe about 4 cm into the first buffer, press CAL, select the buffer value if needed and confirm with CFM when the hourglass symbol stops flashing. Repeat the procedure for the next buffers and finally save the calibration with CAL. Calibrate when replacing the electrode, at least once a week, after measuring aggressive chemicals, or on the CAL DUE warning.

Advantages: pH-ORP-TEMP meter AD131/AD132

• Waterproof, rugged portable meter
• pH range −2.00 to 16.00, accuracy ±0.01 pH
• mV (ORP) measurements ±2000 mV with a suitable electrode
• Temperature −20 to 120 °C, automatic or manual temperature compensation
• Up to 5-point calibration with 7 stored buffers
• Calibration expiry warning and a GLP function for reviewing the last calibration
• Logging of up to 500 measurements on request, HOLD function
• AD132: RS232 interface for PC and printer
• AA batteries last about 300 hours of use
• Price: €289.90

Use: pH-ORP-TEMP meter AD131/AD132

Who is it for

Choose it when you need a rugged waterproof meter with several calibration points and measurement logging. If a simpler professional meter is enough, see the AD111 pH-ORP-TEMP meter or the AD110 pH/temp meter.

Maintenance: pH-ORP-TEMP meter AD131/AD132

Storing and cleaning the electrode

Remove the electrode's protective cap before use. For storage add a few drops of storage solution to it, and never store the electrode in distilled water. If the glass bulb or junction is dry, soak the electrode in the storage solution for at least one hour. Check the cable and electrode regularly and replace the electrode if it is damaged. Clean it with a pH electrode cleaning solution and then recalibrate. The replacement temperature probe is the A7662.

Technical specifications: pH-ORP-TEMP meter AD131/AD132

• pH range: −2.00 to 16.00, resolution 0.01 pH, accuracy ±0.01 pH at 25 °C
• mV range: ±2000 mV, resolution 0.1 mV (up to ±999.9 mV), accuracy up to ±0.2 mV
• Temperature: −20.0 to 120.0 °C, resolution 0.1 °C, accuracy ±0.4 °C
• pH calibration: up to 5 points, buffers 1.68/4.01/6.86/7.01/9.18/10.01/12.45
• Logging: up to 500 samples
• Electrode: AD1230B pH, BNC, 1 m cable; AD7662 probe, 1 m cable
• Power supply: 4 × 1.5 V AA, about 300 hours
• Dimensions: 188 × 96 × 70 mm, weight 460 g

If you are looking for a pH-ORP-TEMP meter AD131/AD132 for demanding measurement of pH, ORP and temperature, this is a waterproof professional ADWA meter with up to five calibration points. Also see all ADWA pH and ORP meters.