This wireless psychrometric probe provides accurate indoor and outdoor temperature and hygrometry measurements to work on air
conditioning, refrigeration and heat pump installations.
The Si-TH4 calculates dry and wet bulb temperatures quickly and easily, using a flexible probe with a sliding magnet for convenient
positioning. It connects easily to the Si-RM350 and Si-RM450 manifolds, as well as to the mobile application Sauermann Pilot.
A1 / A2L / A2 / A3 refrigerants compatible
Compatible with some B1 refrigerants, see list of refrigerants for details on which refrigerants are compatible. The device must not be used with ammoniac refrigerant (NH3 / R717).
Measure details
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Units°F, °C, % RH

Measuring ranges
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Temperature-20.00 °C ... 60.00 °C
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Temperature-4.00 °F ... 140.00 °F
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Humidity0.00 % RH ... 100.00 % RH

Technical details
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ParametersRelative humidityTemperature
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Battery life50 hours
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Standards2011/65/EU RoHS II2012/19/EU WEEE2014/53/EU RED
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Wireless connectionYes
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Power supply3x LR03 AAA 1.5 V alkaline batteries

Instrument Dimensions
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LengthWidthHeightWeight
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16 3/32 inches , 410.2 mm1 1/2 inches , 37.7 mm1 13/32 inches , 34.85 mm

Storage temperature
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MinMax
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-20.00 °C50.00 °C
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-4.00 °F122.00 °F