OM371 : DEW POINT TRANSMITTER

Applications

The exact monitoring of dew point temperature in compressed air systems, dryers for plastic and other indus¬trial processes is becoming increasingly more important. 0M371 series with a measuring range -60...60°C Td (-112...140°F Td) is the ideal solution for such applications. The core of the transmitter is the monolithic measurement cell type HMC01, developed by Omicron Sensing in thin film technology.An autocalibration procedure which is integrated in the device and years of experience in low humidity adjustment make an accuracy of <2°C Td (±3.6°F Td) possible. The compact construction in a robust aluminium housing and the numerous options allow easy mounting and many application possibilities.

Autocalibration

Dew point temperatures in the range of -60...-20°C (-76...-4°F) at room temperature correspond to relative humidity values of 0.08...5.37% RH. The measurement of these low humidity values is not possible with conventional capacitive measurement methods. For the 0M371 series a special autocalibration procedure is utilized to achieve high accuracy measurements at lowest dew points too.

Specifications

Measuring Quantities
Dew Point (Td)
Dew Point Sensor	:	HMC01
Measuring Range	:	25°C to + 65°C
Accuracy	:	Traceable to intern. standards, administrated by NIST, PTB, BEV...
	:	RTD-PT100 / K Type Thermocouple
Response Time t₉₀	:	80 sec. -20°C Td —> -40°C Td (-4°F Td —> -40°F Td) 10 sec -40°C Td —> -20°C Td (-40°F Td —> -4°F Td)

Volume concentration
Measuring range	:	20...200 000ppm
Accuracy at 20°C (68°F) and 1013mbar	:	5ppm + 20% of reading

Outputs
Selectable and scalable	:	0 - 10V -1mA< I,< 1mA
analogue output for Td, Tf, Wv	:	4 - 20mA R < 500 Ohm

General
Supply Voltage	:	21...28V DC
Current Consumption at 24V DC	:	voltage output: typ. 40mA / during autocalibration: 100mA
		voltage output: typ. 80mA / during autocalibration: 100mA
Pressure Range	:	0...20bar (0...290psi)
Housing / protection class	:	Al Si Cu 3 / IP65
Electrical connection	:	M12 connector
Sensor protection	:	stainless steel sintered filter
Working temperature range	:	probe: -40...70°C (-40...158°F) electronic. -40...60°C (-40 140°F)

Storage temperature range	:	-40...60°C (-40...140°F)
Electromagnetic compatibility according to	:	EN 61326-1 EN61326-2-3 ICES-003 ClassB Industrial Environment FCC Part15 ClassB