E+H Liquisys COM253 Field Housing Dissolved Oxygen Transmitter

The Liquisys M COM253 Dissolved Oxygen Transmitter delivers high-precision monitoring and continuous liquid analysis in municipal wastewater, aquaculture, and industrial process automation. Designed as a field-mounted transmitter, the COM253 eliminates the need for extra protective cabinets, reducing overall installation and system engineering costs.
Advanced continuous sensor monitoring flags membrane failure, dirty sensors, or cable disconnects immediately.Automatic temperature, altitude, and salinity compensation guarantees dependable readings across varying process conditions.
Clear two-line backlit display presents DO readings and temperature simultaneously.Simple menu-guided operation with intuitive calibration modes (in air or against reference medium).
Modular design allows easy expansion with additional relay boards or fieldbus protocols (HART / PROFIBUS DP/PA).Built-in control functions (P, PI, PD, PID) enable direct control of dosing pumps, valves, or aeration blowers.

FAQ
Q1: What sensors are compatible with the COM253 transmitter?

A: The COM253 supports standard analog dissolved oxygen sensors (such as Oxymax COS41) as well as Memosens digital oxygen sensors (COS51D / COS61D optical oxygen sensors), depending on the transmitter configuration.

Q2: Can the COM253 control an automatic cleaning system for the DO sensor?

A: Yes. The transmitter features programmable auxiliary relays that can trigger external cleaning systems (e.g., compressed air or water spray cleaning) at customizable time intervals.

Q3: How is the transmitter mounted?

A: As a field-housing instrument (IP65), the COM253 supports wall mounting, pipe mounting (post/mast), or weather-protection cover installation directly near the measurement point.

المواصفات الفنية

مواصفات المنتج التي تمت مراجعتها

Measurement Principle	Dissolved Oxygen Sensor
Application	Water, Wastewater, Process, Fish Farming
Features	Four-wire transmitter with graphical display
Design	Dissolved oxygen transmitter in a PC/ABS field housing, compatible with COS31/41/71
Material	PC/ABS housing
Dimensions	247 × 170 × 115 mm (9.63 × 6.63 × 4.48 in)
Temperature Sensor	Display and current output
Input	Single-channel transmitter
Output	0/4...20 mA, HART, PROFIBUS
Other Certificates	CSA General Purpose Certification

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