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HM4
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ROTRONIC HM4 User Manual

E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
1 of 41
Document Title
DRAFT
HM4
Humidity and Temperature Probe
with Heated Sensor
Instruction Manual
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
2 of 41
Document Title
DRAFT
Table of Contents
1 Overview ............................................................................................................................................... 4
1.1 Scope ................................................................................................................................................. 5
1.2 Background Information on the Principle of Measurement ................................................................. 5
2 Mechanical Variants and Dimensions ................................................................................................ 6
3 General ................................................................................................................................................. 7
3.1 Power Supply ..................................................................................................................................... 7
3.2 Measured Parameters ........................................................................................................................ 7
3.3 Calculated Parameters ....................................................................................................................... 8
3.4 Analog Outputs................................................................................................................................... 9
3.5 RS-485 Interface .............................................................................................................................. 11
3.6 HW4 Software Compatibility ............................................................................................................. 12
3.7 Real-Time Clock ............................................................................................................................... 12
3.8 Sensor Filter ..................................................................................................................................... 12
4 User-Specific Settings and Functions ............................................................................................. 13
4.1 General AirChip3000 Functions ....................................................................................................... 13
4.2 Factory Defaults ............................................................................................................................... 19
5 Mechanical Installation ...................................................................................................................... 20
5.1 General ............................................................................................................................................ 20
6 Electrical Installation ......................................................................................................................... 21
6.2 Wiring ............................................................................................................................................... 23
6.3 Tuchel Connector Pin Configuration................................................................................................. 24
6.4 Cable Connection with Open Ends................................................................................................... 25
7 Operation ............................................................................................................................................ 26
7.1 Load Resistance Requirements of the Analog Outputs .................................................................... 26
7.2 RS-485 Interface .............................................................................................................................. 27
8 Maintenance ................................................................................................ ....................................... 29
8.1 Service Cable ................................................................................................................................... 29
8.2 Calibration ........................................................................................................................................ 30
8.3 Filter Maintenance ............................................................................................................................ 31
8.4 Validation of the Analog Outputs ...................................................................................................... 31
9 Firmware Update ................................................................................................................................ 32
10 Technical Data.................................................................................................................................... 33
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
3 of 41
Document Title
DRAFT
10.1 Dew Point Accuracy ......................................................................................................................... 38
11 Accessories ........................................................................................................................................ 39
12 Additional Documents ....................................................................................................................... 40
13 Document Versions ........................................................................................................................... 41
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
4 of 41
Document Title
DRAFT
1 Overview
The HygroMet4 (HM4) series of devices are digital humidity and temperature probes based on ROTRONIC AirChip3000 technology. The probe permits heating of the sensor during humidity and temperature measurement. It was developed for use in meteorological applications and wherever high humidity and the risk of condensation on the sensor is likely.
The HM4 has two freely configurable and user adjustable linear analog outputs (voltage/current). It also has a RS-485 interface for direct exporting of measured values with the HW4 software and configuration of the probe. The manual E-M-HW4v3-F2-023 describes all software functions. Using the RS-485 interface, it is possible to build a network of up to 64 simultaneously evaluable HM4 probes.
The HM4 offers the following user functions:
Simultaneous measurement and heating Measurement of relative humidity and temperature and calculation of all psychrometric parameters Freely programmable sensor heating (RoHumiHeat) prevents condensation on the sensor Adjustable sensor cleaning (RoHumiClean) to minimise soiling of the sensor SMD Thermo sensor element Outstanding accuracy and repeatability Integrated real-time clock Freely scalable analog output signals RS-485 interface Calibration / Adjustment of humidity and temperature measured values Simulation mode User-specific device settings
Simple updating of the AirChip3000 firmware keeps the devices in the HM4 series up to date with improved functionality.
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
5 of 41
Document Title
Pt100 temperature sensor
Inside: Evaluation electronics with AirChip3000 and real-time clock
Heated SMD Thermo humidity sensor
DRAFT
1.1 Scope
This manual is valid for the HM4 probe series with firmware version V1.1. The low-order digit of the firmware version stands for minor changes, e.g. correction of errors, that do not influence the main functionality of the device.
1.2 Background Information on the Principle of Measurement
In environments with high humidity (>90 %RH) near saturation point there is a risk of condensation forming on the humidity sensor. To avoid resultant incorrect measurement, the sensor can be heated above ambient temperature to avoid condensation. The same applies for outdoor measurements in mist or high levels of dew.
The probes in the HygroMet4 series from ROTRONIC (HM4) measure temperature and humidity simultaneously. Formation of condensation on the capacitive SMD humidity sensor can be prevented by raising the temperature above ambient temperature, thereby enabling accurate humidity measurements even when the measurement environment has already reached dew point (100 %RH).
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
6 of 41
Document Title
DRAFT
2 Mechanical Variants and Dimensions
The HM4 is a new development from ROTRONIC and comes in three variants.
Connector directly at the housing Connector on remote cable Cable with open ends
2.1.1 HM4 with 7-Pin Tuchel Connector at Housing
Figure 1: Dimensions of the HygroMet4 with Tuchel connector at the housing in mm
2.1.2 HM4 with Cable
The HM4 is available with a cable length of 2 m or 5 m. The cable is available with open ends or Tuchel T7 connectors.
Figure 2: Dimensions of the HygroMet4 with cable in mm
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
7 of 41
Document Title
Operating State
Current Consumption
5 VDC, without heater
<35 mA
5 VDC, with heater
<55 mA
24 VDC, without heater
<20 mA
24 VDC, with heater
<30 mA
DRAFT
3 General
3.1 Power Supply
The HM4 requires a power supply of 15...24 VDC (55 mA) for full functionality, but may already be operated on 5 VDC with the following restrictions:
Analog output only 0...1 V RoHumiClean function only available to a limited extent (see chapter 4.1.6)
Detailed Power Supply Specifications:
3.2 Measured Parameters
The HM4 measures relative humidity and temperature. The heated SMD humidity sensor allows simultaneous heating and measurement. The temperature is measured at the tip of the probe by an external Pt100 sensor.
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
8 of 41
Document Title
DRAFT
3.3 Calculated Parameters
The HM4 can calculate all psychrometric parameters and assign them to the outputs with the HW4 software.
Dew point (Dp) Frost point (Fp) Wet bulb temperature (Tw) Enthalpy (H) Vapour concentration (Dv) Specific humidity (Q) Mixing ratio (R) Saturation vapour concentration (Dvs) Vapour partial pressure (E) Water vapour saturation pressure (Ew)
Remark:
The above parameters are dependent on barometric pressure. Using the HW4 software, it is possible to store the barometric pressure at the probe in the HM4 probe. Programming of the HM4 with the HW4 software is described in the manual E-M-HW4v3-F2-023.
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
9 of 41
Document Title
Output
Scale
Output 1 (Out1)
0…100 %RH
Output 2 (Out2)
-40…60 °C
DRAFT
3.4 Analog Outputs
The ROTRONIC HW4 software enables free configuration and scaling of the analog outputs. The measured values (humidity, temperature) and resultant calculated values can thus be assigned to the analog outputs (Out1, Out2) and scaled at will. The output variants (current or voltage) are defined by the order code. They may be changed at will without need to recalibrate the device.
Default scaling of the outputs ex works:
The scale of the output variables and assignment of the measured variables to the outputs can be changed at will with the HW4 software. The following output variables are available to the user:
Relative humidity Temperature Calculated parameters
By scaling, the user can set the limits of the temperature and measurement range freely to any values between
-999 and +9,999. Temperature measurements are possible in the following units: °C (degrees Celsius) °F (degrees Fahrenheit)
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
10 of 41
Document Title
Order Code
Signal Type
Maximum Offset
HM431
0…20 mA
20 µA
HM432
4…20 mA
No offset
HM433
0…1 V
1 mV
HM434
0…5 V
10 mV
HM435
0…10 V
10 mV
DRAFT
The analog outputs have a resolution of 16 bit and, depending on the output variant, a maximum offset as named in the table below.
Important: The maximum load values and minimum load resistances must be taken into account for the current and voltage outputs. See chapter 10 for details.
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
11 of 41
Document Title
DRAFT
3.5 RS-485 Interface
The RS-485 interface is used to connect the HM4 to a PC. A PC running the HW4 software (Professional version) offers the following functions:
Recording and display of current measured and calculated values Configuration of the probe Calibration and adjustment of the probe
Depending on the type of probe connection (Tuchel connector / open ends), different accessories are needed to connect the HM4 to a PC.
Tuchel connector:
HM4 probes with Tuchel connector are connected with AC3010-T (RS-485-to-USB adapter). The device can then be found and integrated using the HW4 software:
Devices & Groups > RS485 > Search for Devices connected via AC3010 adapter
Open ends:
HM4 probes with open cable ends require AC3010 (RS-485-to-USB adapter) or AC3011 (RS-485-to­Ethernet adapter). Both adapters allow a RS-485 network with up to 64 probes. The device can then be found and integrated using the HW4 software:
Devices & Groups > RS485 > Search for Devices connected via AC3010 adapter Devices and Groups > RS485 > Search for Devices connected via AC3011 adapter
See the manual E-M-HW4v3-Main, points 6.4, 7.5 and 11.2.2, for detailed information on building RS-485 networks and integrating HM4 probes in the HW4 software. Accessories such as AC3010 and AC3011 are described in the manual E-M-HC2-accessories.
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
12 of 41
Document Title
DRAFT
3.6 HW4 Software Compatibility
The devices in the HM4 series are fully integrated in the HW4 software V3.4 and later.
3.7 Real-Time Clock
The HM4 probes are equipped with a battery-powered real-time clock. The button battery of the type CR-1220 guarantees clock operation for a period of about 10 years. The battery of the real-time clock is only used when the HM4 is not connected to an external power supply. The real-time clock is set ex works and can be readjusted with the HW4 software. The maximum rate deviation of the clock is ±5 minutes per month (<116 ppm).
3.8 Sensor Filter
The probe must be protected at all times against dust and weather influences by a polyethylene filter. The filter has a pore size of 20 µm (ROTRONIC order code: NSP-25-PE).
© 2014; ROTRONIC AG E-M-HM4-V0_08
E-M-HM4-V0_08
ROTRONIC AG Bassersdorf, Switzerland
Document Code
Unit
Instruction Manual
Document Type
Page
13 of 41
Document Title
Humidity and Temperature Adjustment
One-point or multi-point humidity calibration and adjustment One-point and two-point temperature calibration and adjustment Time stamp for every calibration and adjustment point Saving and display of the last adjustment data and values Creation of a calibration and adjustment log
Simulation Mode
Defines freely selectable values at the analog and digital outputs. Simulation mode is enabled/disabled with the HW4 software.
DRAFT
4 User-Specific Settings and Functions
The HM4 has a variety of functions and settings that can be adapted by users to their requirements. This chapter contains an overview of all functions and their default settings.
4.1 General AirChip3000 Functions
This section outlines the general functions of the AirChip family available in the HM4. All functions can be used with the HW4 software and are described in detail in the manual E-M-HW4v3A2-001.
4.1.1 Humidity and Temperature Measurement
IMPORTANT: All heating and cleaning functions must be switched off during calibration and adjustment!
4.1.2 Device Validation
© 2014; ROTRONIC AG E-M-HM4-V0_08
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