Michell Instruments

MDM25 Hand Held Hygrometer

Battery-operated hand held hygrometer,long term stability: ±1% RH over 12 months

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MDM25 Hand Held Hygrometer 05720
MDM25 2

The MDM25 is a portable, battery-operated hand-held hygrometer, and is available with a number of different probe confi gurations. It displays relative humidity, temperature and one calculated value, making this hygrometer suitable for a wide range of applications. The user can choose to display either °C or °F.

• Displays %RH and temperature, plus dew-point, absolute humidity and wet bulb temperature
• Simple to operate
• Long term stability: ±1% RH over 12 months

Measurement Units%RH, °C/°F Ta, °C/°F Td, g/m3, °C/°F Tw
Mechanical Specification
Ingress ProtectionIP54 - Hygrometer
Hygrometer Housing MaterialMolded polymer housing ABS + rubber surround
Weight300g (10.58oz)
Display ResolutionGraphic LCD 128 x 64 pixels
Electrical Output/Input
Supply Voltage4.5 V (3 x AA batteries - provide approximately 70 hours of operation)
Electrical ConnectionsM9 5-way triad connector
Probes
Measurement Range (RH)0 - 100% RH
Accuracy @ 25°C (77°F) Temperature<±0.2°C (±0.36°F)
Stability - RH Sensor±1% RH/year
Response time - RH Sensor<10 sec typical (for 90% of the step change)
Measurement & Operating Range (T) For Fixed and Standard Probe-20 to +80°C
Measurement & Operating Range (T) For Sword Probe-20 to +100°C
Measurement & Operating Range (T) For Remote Probe-20 to +150°C
Accuracy @ 25°C Humidity For Fixed Probe±2% RH (10 - 90% RH)
Accuracy @ 25°C Humidity For Remote Probes±2% RH (5 - 95% RH)
Mechanical Specification
Weight
Fixed Probe (FPR) 30g
Standard Probe (SPR) 90g
Sword Probe (SWPR) 500g
Round 300mm Probe (HTPR300) 380g
Round 500mm Probe (HTPR500) 620g

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