Michele Ceramic MWW12A000002 Guia do Utilizador descarregar pdf (Página 42)

100

Humidity and Dew-Point Instruments

Please note: Michell Instruments adopts a continuous development program which sometimes

necessitates speciﬁ cation changes without notice. Please contact us for latest version.

www.michell.com

Precision Manufacturing

Dimensions

WM281

Digital Relative Humidity & Temperature Transmitter, Wall Mount

Accessories and Spare Parts

RS422/485 to PC (RS232) converter 330185

USB cable/software for conﬁ guration F035263

SS sintered ﬁ lter H2

SS sintered ﬁ lter with teﬂ on coating J2

Delrin cap slotted with SS mesh ﬁ lter K7

Delrin cap slotted with PTFE ﬁ lter, white Z7

Hygrosmart with Pt100 output (RH = 0-1 V) I7-0-00-1

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

HKC

The WM281 relative humidity transmitter includes the

interchangeable Hygrosmart module. The interchangeable

module lets you recalibrate the transmitter simply by

replacing the sensor head with the Hygrosmart module. As a

result, maintenance costs are greatly reduced and down-time

is minimized.

Highlights

• Analog and digital output standard

• Based on the interchangeable Hygrosmart module

• Analog output signals selectable through software

• Metric or US measurement units selectable through

software

Technical Speciﬁ cations

Performance

Measurement range (RH) 0–100% RH

Measurement range (T) -30 to +70°C (-22 to +158°F)

Accuracy at 23°C (73°F)

Humidity

<±2% RH (5-95% RH)

Accuracy at 23°C (73°F)

Temperature

±0.4°C (±0.72°F)

Stability – RH Sensor <±1% RH/year

Response time – RH Sensor <10 sec typical (for 90% of the step

change)

Electrical output/input

Output signal conﬁ gurable on

request

0–1, 0–5, 0–10 V

0–20 mA, 4–20 mA, RS485

Supply voltage 15 - 27 V AC / 18 - 38 V DC

Load resistance Current output: R  500 

Power consumption 1.7 W

Operating conditions

Operating temperature

Probe

Housing

Storage

-30 to +85°C (-22 to +185°F)

-30 to +70°C (-22 to +158°F)

-40 to +70°C (-40 to +158°F)

Mechanical speciﬁ cation

Ingress protection IP67

Material

Housing

Probe

Aluminum die casting

Delrin

Dimensions

Housing

Probe

120 x 120 x 49.5mm (4.72 x 4.72 x 1.94”)

L=100mm, ø 19mm (L=3.93”, ø0.74”)

Weight 450g (15.87oz)

Electrical connections Screw terminals

INTERCHANGEABLE

MODULE

HYGROSMART ®

Issue No: WM281_97185_V2_UK_1110

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