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Applied Humidity Sensor

Applied Humidity Sensor

ASH-100 is mainly used for monitoring the atmospheric temperature,humidity and pressure.


Product Features

• Highest accuracy
• Excellent protection against pollution
• Outstanding long term stability
• low power consumption

Product Description

ASH-100 is mainly used for monitoring the atmospheric temperature,humidity and pressure. All measured and calculated values are available on the RS-485 interface with Modbus RTU protocol.The compact design with M12 connector allows for easy installation and fast replacement of the probe.


Technical Specification
Supply Voltage +10V to +26VDC
Current rating 5mA(max)
Operating Temperature -40 °C to +85 °C
Operating Humidity : 0 % RH to 100 % RH
Operating Pressuret 300 to 1100 hpa
Serial Communication RS485
Response Time 1s
Protocol ModBus RTU
Board Dimension(LxW) 72x 8.5
Absolute Accuracy humidity ± 3 % RH
Absolute Accuracy Temperature ±1.0 °C
Absolute Accuracy Pressure ±1.0 hpa
Humidity Resolution or sensitivity 0.008 % RH
Temperature Resolution 0.01 °C
Pressure Resolution 0.18pa
Casing Type M12 Housing
Serial Communication Parameters(default)
Baud Rate 9600 bps
Data Bits 8
Parity none
Flow Control none
Stop Bits 1

Modbus RTU Protocol Mapping Details

• The measures values are saved as 16 bit unsignes integer between 0x27 and 0x2A • Values are stores with a scaling of 1:100(eg Temperature = 2550 is equivalent to 25.5 *C
Protocol Address (Hexa) Protocol Address (Decimal) Parameter Name
0x27 39 Temperature [*c]
0x28 40 Humidity [%]
0x29 41 Pressure High Byte [hpa]
0x2A 42 Pressure Low Byte [hpa]

Query to ASH100

Field Name Example (Hex)
Slave Address 127(can set from 1 to 127)
Function 03(Read Holding Register)
Starting Address High 00
Starting Address Low 27 (in Hexa)
Number of data’s to read high 00
Number of data’s to read low 04
CRC Low Byte 00
CRC High Byte 04
Humidity Sensor

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