This document is the instruction manual of HI 981406 pH & ORP Indicator with LED Alarm Signals, which mainly introduces the usage method, warranty policy, etc. of the product.
The Hanna Instruments HI 981406 is an indicator designed specifically for monitoring both pH and Oxidation-Reduction Potential (ORP) in applications such as water treatment and swimming pools. The device features two separate LCD displays and adjustable setpoints that trigger independent LED alarms when readings exceed or fall below the desired limits.
The instrument includes a 12 Vdc power adapter, a grounding bar, and optional electrodes designed to resist clogging. Users can adjust calibration trimmers for pH levels (4-point or 2-point) and ORP values. The manual details procedures for connecting BNC connectors, taking measurements, adjusting alarm setpoints via rear panel switches, and maintaining the electrodes using specific cleaning and storage solutions.
| Range (pH) | 0.0 to 14.0 pH |
|---|---|
| Resolution (pH) | 0.1 pH |
| Accuracy (pH) | +/-0.2 pH (@20°C/68°F) |
| Range (ORP) | +999 mV |
| Resolution (ORP) | 1 mV |
| Accuracy (ORP) | +/-5 mV (@20°C/68°F) |
| pH Setpoint Range | 5.0 to 9.0 |
| ORP Setpoint Range | 350 to 850 mV |
| Operating Temperature | 0 to 50°C (32 to 122°F) |
| Dimensions | 165 x 110x 35 mm |
| Weight | 300 g (10.6 oz.) |
The appropriate LED will flash to alert the operator.
The ORP Alarm LED blinks.
No, you should never use distilled or deionized water for storing the electrodes.
It is recommended to clean them at least once a month.