Envco – Environmental Equipment

The YSI Model 85 is designed for use in field, lab, and process control applications as well as for environmental, aquaculture, and industrial uses. The Model 85 is available with cable lengths of either 10, 25, 50 or 100 feet. The body of the probe has been manufactured with stainless steel to add rugged durability and sinking weight. The probe also utilizes our easy to install cap membranes for measuring dissolved oxygen.

• Data logging in non-volatile memory with identification
• Easy-to-use screw-on cap membranes
• Large, easy-to-read backlit display
• Temperature compensated conductivity
• Autoranging enables fast, convenient conductivity measurement
• able lengths are available in 10, 25, 50 or 100 feet (3, 7.6, 15.2, 30.5 m)
• Meets IP-65 water tightness requirements
• CE compliant version available

The YSI Model 85 probe is a non-detachable, combination sensor designed specifically for the YSI Model 85 Handheld System. The conductivity portion is a four-electrode cell with a cell constant of 5.0/cm ±4%. The dissolved oxygen portion is a polargraphic Clark type sensor.

The Model 85’s microprocessor allows the system to be easily calibrated for dissolved oxygen or conductivity with the press of a few buttons. Additionally, the microprocessor performs a self-diagnostic routine each time the instrument is turned on. The self-diagnostic routine provides you with useful information about the conductivity cell constant and function of the instrument circuitry.

The system simultaneously displays temperature (in °C), along with one of the following parameters: dissolved oxygen in either mg/L (milligrams per liter) or % air saturation; conductivity; temperature compensated conductivity; (in μS/cm or mS/cm), and salinity (in parts per thousand {ppt}).

The system requires only a single calibration regardless of which dissolved oxygen display you use. The calibration of conductivity is not required but is available. A single calibration will adjust the instrument, regardless if you are reading conductivity or temperature compensated conductivity. You can switch between all of these parameters with the push of a single key.

A calibration\storage chamber is built into the instrument case. A small sponge in the chamber can be moistened to provide a water saturated air environment that is ideal for air calibration of the dissolved oxygen probe. This chamber also provides a convenient place to store the probe when the system is not in use, and provides protection for the electrodes within the conductivity probe. The Model 85 case is also waterproof (rated to IP65). You can operate your Model 85 in the rain without damage to the instrument.

Ordering Information
Model 85 DO/SCT Meter
85-10 85 DO/Cond/Salinity Meter with 10 ft. cable
85-25 85 DO/Cond/Salinity Meter with 25 ft. cable
85-50 85 DO/Cond/Salinity Meter with 50 ft. cable
85-100 85 DO/Cond/Salinity Meter with 100 ft. cable

Model 85 “D” DO/SCT Meter
85D 85 DO/Cond/Salinity w/ Detachable cable connect
85D-10 DO/SCT Probe with 10 ft. Detachable cable
85D-25 DO/SCT Probe with 25 ft. Detachable cable
85D-50 DO/SCT Probe with 50 ft. Detachable cable
85D-100 DO/SCT Probe with 100 ft. Detachable cable