The OdaTrak™ 4 to 20mA adapter was primarily designed as an interface between the OdaLog gas Logger and industrial control systems for the purpose of continuous, real-time optimisation of chemical dosing odor control systems and connection to telemetry and other systems.

The OdaTrak™ 4 to 20mA adapter reads gas concentration data sent from an OdaLog gas Logger over a fiber optic cable, deciphers the data, and then outputs the corresponding 4-20mA loop analogue signal. This allows the OdaLog unit to be interfaced to control and telemetry systems providing real-time gas data. This signal could be used to optimise chemical dosing, trigger alarms, control ventilation fans, or interface to telemetry systems etc. The OdaLog Logger can still be used as a standalone data-logging instrument if required.

Special features of the OdaTrak™ 4 to 20mA adapter include:

Fault detection - The OdaTrak™ has the ability to detect for a loss of OdaLog data over a predetermined period of time and will output a fault state on the 4 to 20mA line when that time limit has expired. The fault current is 3.5mA.

Suitable for harsh environments - The fibre optic cable connector features an O-ring seal to prevent the ingress of dust and liquid, and the OdaTrak unit is fully sealed.

Quick and easy installation - The OdaTrak has an M20 thread machined as part of the housing. Simply mount through a 20mm hole or threaded junction box entry.

Data logging - All of the usual OdaLog functions, including data logging, are available while the 4 to 20mA link is active.

The OdaTrak™ System typically includes:
• One to three OdaLog® gas Loggers
• One fibre optic cable used to connect the OdaLog fibre optic output to the input of the OdaTrak™ 4 to 20mA adapter.
• One OdaTrak™ 4 to 20mA adapter

For continuous monitoring in very humid environments (typical of wastewater applications), the OdaTrak™ System requires three OdaLogs with each OdaLog in service no longer than one week whilst the other two OdaLogs are stored in fresh air. This allows the sensor in each OdaLog to recover from the high relative humidity and gas levels present in most wastewater applications. Alternatively, two OdaLogs can be used in combination with a Sensor Conditioning Kit. Place the recovering OdaLog into the Sensor Conditioning Kit for a few days while resting to speed sensor recovery from two weeks to one week enabling continuous monitoring to be achieved with two OdaLogs instead of three.

The Sensor Conditioning Kit uses a replaceable drying media to maintain a very low humidity atmosphere inside the container. This significantly speeds up the removal of excess water from the gas sensor. Typically this allows two OdaLog units to be used for continuous monitoring applications in humid environments instead of three. A digital humidity meter in the lid of the Sensor Conditioning Kit continuously monitors the condition of the internal atmosphere and can be used to determine when replacement of the drying media is required.