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20 Series Wireless

Insite Instrumentation Group, Inc.
Water and Wastewater Quality Instrumentation



M-20 Dissolved Oxygen Probe


M-20 Method of Operation

A very specific energy wavelength is transmitted to a ruthenium compound immobilized in a sol-gel matrix. The ruthenium will absorb this energy, changing the outer electronís energy level. The electron will then collapse back to itís original energy state, emitting the energy as a photon with a different specific wavelength. This is called fluorescing. If the intensity of the transmitted wavelength is tightly controlled, the amount of fluorescing is both predictable and repeatable. If oxygen molecules are present the amount of fluorescing is reduced, referred to as fluorescence quenching. By measuring the amount of quenching it is possible to determine the amount of oxygen present.


M-20 Quick Specs.

The sensors incorporate self-cleaning optics via air or water jet. Response time is 95% of full scale in less than 60 seconds. Sensor drift is less than 2% per year. Operating temperature range is 0 to 50 degrees C. Wetted materials are epoxy, polyurethane, PVC, or 316 SS.

Dissolved Oxygen Probe | M-20

20 Series Wireless


20 Series Wireless

The Insite Instrumentation Group Model 20 (M-20) dissolved oxygen sensor is a unique product that combines advanced electronics with solid-state, optical sensing technology. The sensor is based on the field proven design of the Model 10 family of sensors with over 8,000 units shipped. To this proven design, the Model 20 adds the ability to mount the sensors throughout the plant without having to deal with running conduit between the sensor and analyzer. This allows for significant savings on installation costs while also allowing maximum flexibility in sensor placement. No other dissolved oxygen sensor can compare with the features and benefits of this revolutionary design.

Sensor Transmitter | ST 2

The M-20 sensor connects to a Sensor Transmitter (ST 2) junction box. The ST 2 then communicates with the Process Transmitter (PT 2) via a ZigBee compliant Rf module. There is an embedded antenna which provides an outdoor line of sight range up to one mile. When several ST 2 / Sensor pairs are installed they form a self-healing mesh network that increases reliability.




Model 20 Dissolved Oxygen Probe (M-20)

M-20 DO Probe

The M-20 Sensor is our standard fluorescence dissolved oxygen sensor configuration. This includes the 1-1/2" NPT male mounting thread, 1/4" quick connect tube fitting for the integrated jet clean, and 33ft (10m) of sensor communications cable. Additional cable length is available upon request.



Model 20PI Dissolved Oxygen Probe (M-20PI)

M-20PI DO Probe

The M-20PI Sensor is intended for inline monitoring in a large diameter pipe. The mount is 2" NPT male thread in 316 stainless steel that works with a customer supplied 2" Thread-O-Let. The integrated jet clean with this sensor includes an inline check valve. There is a flow indication groove on the back of the sensor mount that should be parallel with the flow.



Model 20T Dissolved Oxygen Probe (M-20T)

M-20T DO Probe


The M-20T Sensor is intended for inline dissolved oxygen monitoring utilizing a by-pass loop. The by-pass loop is generally configured using customer supplied full port ball valves on both sides of the tee. The supplied tee (as shown) is 3" schedule 80 PVC, with slip connections. The integrated jet clean with this sensor includes an inline check valve. There is a flow indication groove on the back of the sensor mount that should be parallel with the flow.





Model 20HT Dissolved Oxygen Probe (M-20HT)

M-20HT DO Probe

The M-20HT Sensor combines the ease of use of a hot tap mount with the reliability of the InsiteIG DO Sensor. The mount is a 2" NPT male thread in 316 stainless steel that works with a customer supplied 2" Thread-O-Let, saddle or existing piping. The integrated jet clean includes an inline check valve.



See also: Portable Dissolved Oxygen and
Portable Suspended Solids



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