Datasheet

ManualsBrandsIST AG ManualsSensorsHYT 939 Digital Humidity And Temperature Sensor Digital humidity/temperature sensor

ASSEMBLY RECOMMENDATION

1/2

HYT 939 Humidity sensors

Mounting instructions

The media compatibility of the sensor, housing and sealing materials are to be checked and kept suitable as per

the application.

The housing and the assembly must be so constructed that it can withstand the application pressure multiplied by

the factor of safety. In case of dynamic applications in the upper pressure range, an additional extra factor is to be

taken into account for the material fatigue.

The assembly must be done stress free. This should remain valid for the entire temperature range, considering the

different coefficients of expansion between the sensor housing and the opening.

The support from top may be provided only in the boundary area. The upper mounting ring must rest upon flat.

Sealing rings

The most frequent error in case of a pressure resistant assembly is the loss of sealing. Therefore, this is the point

where high attention is to be given.

Standard sealing rings in the form of O-rings are available in the market, which are offered by different manufactur-

ers. A typical dimension is, for example, 7 x 1 mm.

The material is dependant on the application, hence due to qualitative reasons, high grade options of VITON or

FPM are recommended, which are also resistant to ageing and temperature exposure.

In case of queries, we recommend to directly contact the manufacturer of O-rings:

Busak und Shamban GmbH

Handwerkerstr. 5-7

D- 70565 Stuttgart

www.busakshamban.de

Suggested type: BUSAK + SHAMBAN, O-Ring Dimension 7 x 1 mm

Dichtomatik GmbH

Albert-Schweizer-Ring 1

D- 22045 Hamburg

www.dichtomatik.de

Suggested type: Dichtomatik, O-Ring Dimension 7 x 1 mm

Summary of content (5 pages)

PAGE 1
ASSEMBLY RECOMMENDATION HYT 939 Humidity sensors Mounting instructions The media compatibility of the sensor, housing and sealing materials are to be checked and kept suitable as per the application. The housing and the assembly must be so constructed that it can withstand the application pressure multiplied by the factor of safety. In case of dynamic applications in the upper pressure range, an additional extra factor is to be taken into account for the material fatigue.
PAGE 2
ASSEMBLY RECOMMENDATION 2/2 These recommendations for construction are to be understood only as an assistance for our own construction. The dimensioning of the components in each case is to be decided suiting to the application and checked. Please also consider the fitment and application guidelines of O-ring manufacturer! Version 1 Version 2 Legal Notice: These recommendations for construction are unbinding; alterations are possible in these recommendations at any time without prior notice.
PAGE 3
HYGROCHIP 1/3 DIGITAL HUMIDITY SENSOR HYT-939 Characteristic Features Measuring range 0 .. 100% rH, -40 … 125°C I2C protocol for humidity and temperature (address 0x28 or alternative address) Accuracy ±1.8% rH, ±0.2°C Temperature compensated Typical Areas of Application Medical systems Autoclaves Pressure dew point measurement (pressure tight sensor packaging required) Drying systems Laboratories Both the linearity error and temperature drift are corrected “OnChip” through computation.
PAGE 4
HYGROCHIP 2/3 DIGITAL HUMIDITY SENSOR HYT-939 Technical Data Relative Humidity Accuracy Humidity Measurement Humidity measuring range (1) 0 ... 100% rH see Figure 3 Humidity accuracy (2) ±1.8% rH (10 ... 80% rH) see Figure 1 (Maximum tolerance) Accuracy humidity 0 .. 10% RH (0 ... 50 ° C) ±(1% rF + 8% aw) (Typical tolerance) aw = rF / 100% Hysterisis (50% rH) < ±1% rH Humidity resolution 0.
PAGE 5
Humidity Application Range Operating voltage 2.7 … 5.5V Current consumption (Nominal) < 22HA at 1Hz measuring rate 850HA maximum Current consumption (Sleep) < 1HA Application temperature -40°C ... 125°C Humidity application range 0 ... 100% rH Digital interface I2C, address 0x28 or alternative address Limits Operating voltage -0.3 … 6.0V Storage temperature -20°C ... 80°C All mechanical dimensions are valid at 25°C ambient temperature, if not differently indicated.