HI 9142 is a rugged, waterproof meter that solves the common problems of field use, such as cold, rain, snow and dust, that can damage a meter, rapidly deteriorating its performance and life. It is very simple to use: calibration is performed with HI 7040 zero oxygen solution, while 100% calibration is done in air. The polarographic probe (HI 76407/4) is provided with a membrane covering the sensors and a built-in thermistor for temperature measurement and compensation. The thin permeable membrane isolates the sensor elements from the testing solution, but allows oxygen to enter. When a voltage is applied across the sensor, oxygen that has passed through the membrane reacts causing current to flow, allowing the determination of oxygen concentration.
The Hanna Instruments HI 9142 is a rugged, waterproof polarographic dissolved oxygen (D.O.) meter designed for field use. It features an integrated thermistor for temperature compensation and includes a supplied HI 76407/4 probe with a 4-meter cable. The instrument allows calibration using zero oxygen solution and air saturation.
| Range | 0.0 to 19.9 mg/L (ppm) |
|---|---|
| Resolution | 0.1 mg/L |
| Accuracy | +/-1.5% FS |
| Battery Type | 4x 1.5V AA |
It is recommended to perform the slope calibration procedure every week.
A water movement of 0.3 m/sec is required at a minimum to ensure the membrane surface is replenished.
It is recommended to wait at least 15 minutes to ensure precise conditioning of the probe.