Michell Instruments WR293 Specifications
Humidity and Dew-Point Instruments
Precision Manufacturing
WR293
Digital Relative Humidity and Temperature Transmitter - Remote Probe
for High Temperatures
Technical Specifi cations
Performance
Measurement range (RH) 0–100% RH
Measurement range (T) -30 to +200°C (-22 to +392°F)
HYGROSMART ®
INTERCHANGEABLE
PROBE
The WR293 relative humidity transmitter uses the Hygrosmart
module, integrated in the interchangeable probe. This device
can be used in high-temperature applications due to the
remote measurement element and its small overall size. The
interchangeable probe allows for simple recalibration and
lower maintenance costs.
Highlights
Three outputs•
Analog and digital output standard•
Interchangeable probe•
Analog output signals selectable through software•
Metric or US measurement units selectable through •
software
Available with calculated absolute humidity, dew-point, •
frost point, mixing ratio or specifi c enthalpy output
Can withstand temperatures up to 200• °C (392°F)
Dimensions
Issue No: WR293_97194_V3_UK_0811
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
Accuracy at 23°C (73°F)
Humidity
Accuracy at 23°C (73°F)
Temperature
Stability – RH Sensor <±1% RH/year
Response time – RH Sensor <10 sec typical (for 90% of the step change)
Electrical output/input
Output signal 0–1, 0–5, 0–10 V
Supply voltage 15 - 27 V AC / 18 - 38 V DC
Load resistance Current output: R ≤ 500 Ω
Power consumption 1.7 W
Operating conditions
Operating temperature
Probe
Housing
Storage
Mechanical specifi cation
Ingress protection IP65 (NEMA 4 level)
Material
Housing
Probe
Dimensions
Housing
Probe
Weight 450g (15.87oz)
Electrical connections Screw terminals
Display resolution LCD, 2 lines x 16 characters
Accessories and Spare Parts
RS422/485 to PC (RS232) converter 330185
USB cable/software for confi guration
Al mounting fl ange for ø12mm (0.47") SS probes
SS sintered fi lter
SS sintered fi lter with tefl on coating
SS mesh fi lter
PEEK protection cap with SS mesh fi lter
SS probe, cover & mesh fi lter, 2m (6.56') cable
SS probe, cover & mesh fi lter, 2m + 2m
extension (6.56’ + 6.56’) cable
SS probe, cover & sinter fi lter, 2m (6.56') cable
SS probe, cover & sinter fi lter, 2m + 2m
extension (6.56’ + 6.56’) cable
PEEK probe, cover, SS mesh fi lter, 2m (6.56') cable
PEEK probe, cover, SS mesh fi lter, 2m + 2m
extension (6.56’ + 6.56’) cable
You can check your hygrometer with the Control Kit HKC which
is based on the principle of non-saturated salt solutions. Refer
to technical data sheet CONTROL KIT
57
<±2% RH (5–95% RH)
±0.4°C (±0.72°F)
0–20 mA, 4–20 mA, RS485
-30 to +200°C (-22 to +392°F)
-30 to +70°C (-22 to +158°F)
-40 to +70°C (-40 to +158°F)
Aluminum die casting
Stainless steel
120 x 120 x 51mm (4.72 x 4.72 x 2.00”)
L=134mm, ø12mm (L=5.27”, ø0.47”)
www.michell.com
F035263
FLA012
H3
J3
K8
K9
USTE002
USTE005
USTE006
USTE007
USTE008
USTE009
HKC
Humidity and Dew-Point Instruments
WR293
Electrical Connections
Pin Pin
1 Power Supply V + 8 Output Channel 2 Ground
2 Power Supply V - 9 RS485 Data +
3 Output RS485 Ground 10 RS485 Data -
4 Ground 11 Not connected
5 Output Channel 1 Temperature + 12 Not connected
6 Output Channel 1 Ground 13 Output Channel 3 (optional)
7 Output Channel 2 RH + 14 Output Channel 3 Ground (optional)
Do not connect pin 2 (V -) to pin 4 (Ground)
Ordering Codes
To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a
string: {Feature A}+{Feature B}+{Feature C}+{Feature D}+{Feature E}+{Feature F}
Order example: WR293+A+0+IP6+N030+P180
Digital RH and temperature transmitter WR293, 4-20 mA output, dew point calculated, stainless steel probe with 2m (6.56’) cable and stainless steel sintered fi lter, -30 to
+180ºC (-22 to +356ºF) temp range
WR293 A 0 IP6 N030 P180
Precision Manufacturing
Base Model {Feature A}
Digital RH and temperature transmitter Remote Probe for High Temperatures
Signal Output {Feature B}
4-20 mA A
0-10 V B
0-5 V C
0-1 V D
0-20 mA E
3rd Output {Feature C}
Dew point: -40 to +100ºC 0
Mixing ratio: 0-500 gr/Kg 1
Absolute Humidity: 0-600 g/m
Specifi c enthalpy: -40 to 1500 KJ/Kg 3
Frost point: -50 to +10ºC 4
3
WR293
Temp High {Feature F}
+20°C (+68°F) P020
+30°C (+86°F) P030
+50°C (+122°F) P050
+70°C (+158°F) P070
+100°C (+212°F) P100
+140°C (+284°F) P140
+150°C (+302°F) P150
+180°C (+356°F) P180
+200°C (+392°F) P200
Other output scaling available on request XXXX
Temp Low {Feature E}
2
0°C (+32°F) 0000
-20°C (-4°F) N020
-30°C (-22°F) N030
Probe Type {Feature D}
SS probe, cover & mesh fi lter, 2m (6.56') cable IP2
SS probe, cover & mesh fi lter, 2m + 2m
extension (6.56’ + 6.56’) cable
SS probe, cover & sinter fi lter, 2m (6.56') cable IP6
SS probe, cover & sinter fi lter, 2m + 2m
extension (6.56’ + 6.56’) cable
PEEK probe, cover, SS mesh fi lter, 2m (6.56')
cable
PEEK probe, cover, SS mesh fi lter, 2m + 2m
extension (6.56’ + 6.56’) cable
IP5
IP7
IP8
IP9
© Michell Instruments 2009-2011
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