Rotronic M2 Series Temperature and Humidity Transmitter

Specifications | Diagrams | Installation | Accessories | Field Service

Rotronic,M2,Series,Temperature,Humidity,Transmitter

Fully interchangeable HygroClip probe eliminates maintenance downtime
Proven sensor technology provides ą 1.5% RH/ą 0.3°C
(ą 0.5°F) accuracy
(click here for details)
Probe operating limits: 0...100%RH and
-40...85°C/-40...185°F
Long term stability of better than 1% RH per year
Potentiometer free - digital calibration
On-site loop validation and calibration with HygroPalm 3 calibrator
Duct, wall and remote probe configurations
(remote probe can be separated from transmitter by up to 5 m / 16.4 ft)
2-wire loop-powered or 3-wire versions
Optional display (3-wire version only)
Unique, cost effective installation procedure

M2 Series Specifications

PROBE	M22	M23
Probe type	HygroClip S
Humidity sensor	Rotronic C94 thin film capacitive
Temperature sensor	Pt100 RTD
Operating limits	0...100%RH -40...85°C / -40...185°F
Repeatability	better than 0.5%RH and 0.1°C/°F
Humidity sensor stability	better than 1% RH per year
Sensor protection	type D15G, stainless steel wire mesh, PPS frame
Probe material	Polycarbonate
TRANSMITTER	M22	M23
Circuit type	2-wire loop-powered	3-wire
Signal type	4...20 mA	0...20 mA, 4...20 mA 0...1V, 0...5V, 0...10V (user selectable)
Measuring range	0...100% RH 0...100°F (other ranges are available)
System accuracy at 23°C	ą 1.5% RH / ą 0.3°C (ą 0.5°F)
Operating limits	0...99% RH non condensing -40...60°C (-40...140°F) -30...60°C (-22...140°F) with optional display
Power supply	10...35 VDC, 10 + 0.02 x load 2 x 20 mA	12...35 VDC (65 mA) or 12...24 VAC
Maximum load for current outputs	250 Ohm
Minimum load for voltage outputs	n/a	1000 Ohm
User configurable output signals	n/a	output scale and temperature unit configurable with the HW3 software output signal type (current or voltage) configurable with solder pads
Display option	No	Yes LC, 2 line numeric 1 line alphanumeric 1/4 character height, resolution 0.1
Electrical connections	Cable grip and terminals
Housing material	ABS
Protection grade	IP65/NEMA4
Housing dimensions w/o probe	154 x 72.5 x 48 mm (6.06 x 2.86 x 1.89")
Weight	300 g / 0.7 lb

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M2 Series Electrical Diagrams

M23 3-wire
Current outputs	Voltage outputs

M22 2-wire loop-powered
	Note: 1 and 3 (+) are connected
Base Plate (all models)
	Model	Terminal
	M23	1	+ 10..35VDC / 24VAC
		2	- Ground (common)
		3	+ Temperature
		4	+ Humidity
	Model	Terminal
	M22	1/3	+ 10..35VDC
		2	- Temperature

		4	- Humidity

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M2 Series Accessories

MOK-XX-DAT05	Extension cable for M22 / M23 wall mount (remote probe) XX= 02 (2m / 6ft) or 05 (5m / 15ft)
HygroPalm 3	HygroPalm 3, field calibrator
ACRLXB5	Cable: service connector M22 / M23 to HygroPalm 3 for field calibration (probe connected to transmitter) and loop validation.
ACML232	Configuration cable for the M23 only, connects the service connector to the COM port of a PC. Both the scale of the M23 output signals and the temperature unit can be changed when the HW3 software is installed on the PC.
MOK-02-WIN	Calibration cable for the HygroClip S probe (when the probe is removed from the transmitter) - supplied with 9-pin COM port adapter
HW3	Calibration / configuration software on CD ROM
HygroClip Sxx/yy	HygroClip S probe simulator where xx = relative humidity in %RH and yy = temperature in °C (fixed values)
HygroClip R	Fully calibrated, refurbished HygroClip S (HygroClip Exchange Program)
ER-15	Calibration device for HygroClip
EAXX-SCS	Certified humidity standards (5 per box) XX = 00. 05, 10, 20, 35, 50, 65, 80, 95%RH

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M2 Series Installation:
Modular design simplifies installation and facilitates maintenance

Each M2 series transmitter consists of a base plate and a measurement module (electronics). The transmitters are calibrated at our factory and are shipped in an individual box for protection during shipment or storage.

Installation is a simple 2-step process:

	Step 1 The base plate is mounted and wired (a standard electrical box may be used in the case of a wall installation). Since the measurement module is not required during this part of the installation, it can be safely stored until all the work is completed.
	Step 2 Upon completion of the wiring work, the module is just snapped into the base plate and secured with the screws provided. Any module can be installed with any base plate, no special matching is required. When it is time to re-certify calibration or if a repair is required, simplyreplace the HygroClip probe or the electronics module. Rehabilitated, fully calibrated and certified replacement probes and modules are available from RIC.
HygroClip Plug-in Probe
	Both the HygroClip S and the base of the connector on the transmitter are marked with a dot. The locking ring is marked with 2 dots. The probe can be inserted straight into the connector when all dots are aligned. When the dots are not aligned, the probe should be rotated clockwise during insertion. After inserting the probe, turn the locking ring clockwise to secure the probe. Back To Top

Field Service made easy

Service cable ACRLXB5

Each M2 series transmitter features a service connector that can be accessed without disturbing the output signals.

Service cableACRLXB5 is used to connect the service connector of the M2 to probe input 2 of the HygroPalm 3 portable indicator.

Field Calibration

Using the HygroPalm 3 indicator and the ACRLXB5 service cable, the following can be done:

a) 1-point adjustment of the HygroClip S probe against a reference probe connected to the HygroPalm

b) single- or multi-point adjustment against a reference environment (requires a humidity generator). When no humidity generator is available, ROTRONIC offers easy-to-use certified humidity standards to generate known humidity values

It is also possible to calibrate the HygroClip probe while removed from the transmitter. This allows a periodic rotation of the probes.

See: Probe Calibration

Validation of the signal loop

By displaying the signals of the M2 transmitter with the HygroPalm 3, the entire measuring loop can be validated: probe, transmitter, wiring and central processing unit. If so desired, the HygroClip probe can be replaced with a certified probe simulator that generates known fixed humidity and temperature values.

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