Hygrosmart HS3
Advanced RH & Temperature Probe
User’s Manual
97516 Issue 5
July 2017
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HygroSmart HS3 Probe
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© 2017 Michell Instruments
This document is the property of Michell Instruments Ltd. and may not be copied or
otherwise reproduced, communicated in any way to third parties, nor stored in any Data
Processing System without the express written authorization of Michell Instruments Ltd.
HygroSmart HS3 User’s Manual
Contents
Safety ................................................................................................................................vi
Electrical Safety ...........................................................................................................vi
Toxic Materials .............................................................................................................vi
Repair and Maintenance ...............................................................................................vi
Calibration ...................................................................................................................vi
Safety Conformity ........................................................................................................vi
Abbreviations .....................................................................................................................vii
Warnings .......................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 Operating Flexibility ............................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking .......................................................................................................... 2
2.2 Probe Layout ...................................................................................................... 2
2.3 Maintenance Kits ................................................................................................ 3
2.4 Installation Instructions ...................................................................................... 4
2.4.1 Recommended Installation Environment ......................................................... 4
2.4.2 Element Filter Assembly Environment ............................................................. 4
2.4.3 Probe Wall Mounting ..................................................................................... 5
2.4.4 Duct Mounting .............................................................................................. 5
2.4.5 Pressurized Environment Installation .............................................................. 6
2.4.6 Electrical Requirements ................................................................................. 7
2.4.7 Electrical Connections .................................................................................... 7
2.4.8 Digital Serial Output ...................................................................................... 7
2.4.9 Analog Voltage Outputs ................................................................................. 7
2.4.10 Probe Ordered Confi guration .......................................................................... 8
2.4.11 Probe Reconfi guration ................................................................................... 8
2.4.12 Probe & Sensor Serialization Tracking ............................................................. 8
3 PROBE MAINTENANCE KIT OPERATION ..............................................................9
3.1 Application Software Overview ............................................................................ 9
3.2 Installation ......................................................................................................... 9
3.3 Establishing Communications .............................................................................. 9
3.4 Measurement Data Acquisition .......................................................................... 10
3.5 Probe Confi guration .......................................................................................... 11
3.6 Probe Adjustment ............................................................................................. 12
3.7 Loop Checking Simulation ................................................................................. 18
4 SENSOR REPLACEMENT ...................................................................................19
5 LOOP CHECKING SIMULATION .........................................................................21
5.1 Simulator Connection ........................................................................................ 21
5.2 Checking /Programming the Simulators ............................................................ 21
6 MAINTENANCE ................................................................................................22
6.1 Cleaning the Filter Element ............................................................................... 22
6.2 Probe Adjustment Procedure ............................................................................. 23
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HygroSmart HS3 User’s Manual
Figures
Figure 1 HygroSmart HS3 Probe and Interchangeable Sensor .....................................1
Figure 2 HygroSmart HS3 Probe Packaging ...............................................................2
Figure 3 HygroSmart HS3 Probe Layout ....................................................................2
Figure 4 Acceptable Operating Conditions .................................................................4
Figure 5 Mounting Clamp (HS3-PMC) ........................................................................5
Figure 6 Probe Wall Mounting ...................................................................................5
Figure 7 Duct Mounting ...........................................................................................5
Figure 8 Probe Metal Gland ......................................................................................6
Figure 9 Securing Tether ..........................................................................................6
Figure 10 Electrical Connections .................................................................................7
Figure 11 Connection Console Screen Shot ..................................................................9
Figure 12 Probe and Sensor Information Screen Shot ................................................10
Figure 13 Measurement Data Acquisition Screen Shot ................................................10
Figure 14 Output Channel Example Screen Shot ........................................................11
Figure 15 Probe Confi guration Screen Shot ...............................................................11
Figure 16 Probe Adjustment Screen Shot ..................................................................12
Figure 17 Probe readings prior to adjustment ............................................................13
Figure 18 Editing the Adjustment Table .....................................................................14
Figure 19 Probe readings post-adjustment ................................................................14
Figure 20 Probe readings prior to adjustment ............................................................15
Figure 21 Editing the Adjustment Table .....................................................................15
Figure 22 Probe readings post-adjustment ................................................................16
Figure 23 Probe readings prior to adjustment ............................................................16
Figure 24 Editing the Adjustment Table .....................................................................17
Figure 25 Probe readings post-adjustment ................................................................17
Figure 26 Simulator Window Screen Shot ..................................................................18
Figure 27 Sensor Simulator ......................................................................................21
Figure 28 Filter Cap Removal ...................................................................................22
Figure 29 Filter Element Cleaning .............................................................................22
Figure 30 Dimensional Drawings...............................................................................26
Figure 32 Serial Port Parameters ..............................................................................28
Figure 31 Pinout ......................................................................................................28
Appendices
Appendix A Technical Specifi cations .............................................................................. 25
A.1 Dimensions ................................................................................. 26
Appendix B HS3 Modbus Communications and Register Map .......................................... 28
B.1 Communications .......................................................................... 28
B.2 Code examples ............................................................................ 29
B.3 Register Map ............................................................................... 30
Appendix C Quality, Recycling & Warranty Information ...................................................37
Appendix D Return Document & Decontamination Declaration ........................................ 39
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HygroSmart HS3 User’s Manual
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. The user must not use this equipment for any other purpose than that
stated. Do not apply values greater than the maximum value stated.
This manual contains operating and safety instructions, which must be followed to ensure the safe
operation and to maintain the equipment in a safe condition. The safety instructions are either
warnings or cautions issued to protect the user and the equipment from injury or damage. Use
competent personnel using good engineering practice for all procedures in this manual.
Electrical Safety
The instrument is designed to be completely safe when used with options and accessories supplied
by the manufacturer for use with the instrument.
Toxic Materials
The use of hazardous materials in the construction of this instrument has been minimized. During
normal operation it is not possible for the user to come into contact with any hazardous substance
which might be employed in the construction of the instrument. Care should, however, be exercised
during maintenance and the disposal of certain parts.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. For
Michell Instruments’ contact information please go to www.michell.com.
Calibration
HS3 Probes are adjusted in the factory prior to delivery. Recalibration is recommended after one
year of operation, depending on application. New, freshly calibrated sensors can be supplied quickly
by Michell Instruments, or recalibration can be carried out on site using one of the Michell humidity
calibration systems. Refer to Section 6.2 regarding calibration checking and adjustment of probes.
Safety Conformity
This product meets the essential protection requirements of the relevant EU standards and directives.
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Abbreviations
The following abbreviations may be used in this manual:
barg pressure unit (=100 kP or 0.987 atm) gauge
°C degrees Celsius
°F degrees Fahrenheit
EU European Union
g grams
3
grams per cubic metre
g/m
kg kilograms
Kj/kg kilojoules per kilogram
lb pound
mm millimetre
oz ounce
RH relative humidity
RS485 serial data transmission standard
RTU Remote Terminal Unit
T temperature
V Volts
V DC Volts of direct current
% percentage
" inch
ø diameter
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HygroSmart HS3 User’s Manual
!
Warnings
The following general warning listed below is applicable to this instrument. It is repeated in the text
in the appropriate locations.
Where this hazard warning symbol appears in the following sections, it
is used to indicate areas where potentially hazardous operations need to
be carried out.
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HygroSmart HS3 User’s Manual
1 INTRODUCTION
The HygroSmart HS3 is an accurate, stable and user confi gurable probe designed to
provide reliable relative humidity measurement for process control in a wide range
of applications. The HS3 Probe features interchangeable sensor technology ensuring
minimal process downtime and a low cost of ownership.
INTRODUCTION
Figure 1
1.1 Operating Flexibility
The HS3 Probe has been developed to be 100% customer confi gurable. One stock unit
can be set up by a customer into an application specifi c confi guration to cover any RH
demands on site. This fl exibility saves time and budget.
• Adjustable zero/span ranging of the RH, Temperature and Calculated
Hygrometric Outputs
• Selectable 0 to 1, 2.5, 5, 10 V output signals
• 2 selectable output voltage measured (RH & T) parameters or a choice of
5 calculated parameters (eg dew point)
• Addressable Modbus RTU over RS485 communications for up to 32 probes
• Probe digital Zero/Span calibration trimming
HygroSmart HS3 Probe and Interchangeable Sensor
Alternatively, the HS3 Probe can be confi gured at the factory at time of ordering for
customers who want a simple fi xed confi guration solution.
Michell Instruments
1
INSTALLATION
2 INSTALLATION
2.1 Unpacking
Open the cardboard box and remove the plastic tray inside.
HygroSmart HS3 User’s Manual
Please check that the following components are present:
• HygroSmart HS3 Probe (with the interchangeable HygroSmart HS3 sensor)
• Certifi cate of Calibration
• Quick Start Guide
• User Manual
2.2 Probe Layout
The HS3 Probe with its constituent parts and physical features is detailed in the layout
below:
1 23456
Figure 2
HS3-PE PAA-000002 HS3-PE PAA-000001
HygroSmart HS3 Probe Packaging
98.5mm
HygroSmart HS3 Probe Electronics HygroSmart HS3 Interchangeable Sensor
3.87”
1 M12 5-pin probe electrical connector
2 Probe serial number
3 Probe to sensor connector alignment marks
4 Rotating probe cuff
5 Sensor serial number
6 Filter assembly
Figure 3
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HygroSmart HS3 Probe Layout
HygroSmart HS3 User’s Manual
2.3 Maintenance Kits
INSTALLATION
HS3-SCK
HS3 Probe Simulator Kit
Includes:
- Desk-mounted confi guration kit with 1.8m cable
- 3 sensor simulators (25%, 50%, 75%RH at 23°C (73°F))
- Spare probe electronics
- Carry case
HS3-CK
HS3 Probe Confi guration Kit
Includes:
- Desk-mounted confi guration kit with 1.8m cable
- Spare probe electronics
- Carry case
HS3-CKL
HS3 Logger/Confi guration Converter Cable 1.8 meters
Includes:
- 1.8 meter USB to RS485 converter cable with M12
connector
Michell Instruments
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INSTALLATION
2.4 Installation Instructions
2.4.1 Recommended Installation Environment
When choosing an installation site for the probe, consider the environment around it.
Ensure that the site:
• is clear of nearby obstructions which could limit air circulation to the
probe
• is away from any hot or cold spots - i.e. air conditioning or heater vents
• is not adjacent to any high power sources
• is representative of the surrounding environment at the point of interest
HygroSmart HS3 User’s Manual
The acceptable operating conditions for the sensor are detailed in
RH%
100
75
50
25
Figure 4
Maximum mixing ratio
250g water/kg dry air
Temp °C
-40 0 5025 70 85
Acceptable Operating Conditions
Figure 4
.
2.4.2 Element Filter Assembly Environment
The PVDF fi lter element protects the sensor against particulate contamination and the
effects of high velocity air-fl ow.
To ensure good air-fl ow to the sensor it is recommended to regularly clean the fi lter
element. See Section 6.1 for more details.
The HS3 Probe can be equipped with the following fi lter model
• F1 - PVDF (12mm diameter) black cap assembly
• F2 - 13mm (0.51”) HDPE protection cap
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HygroSmart HS3 User’s Manual
2.4.3 Probe Wall Mounting
A mounting clamp for the HS3 Probe (HS3-PMC) can be ordered as an accessory.
INSTALLATION
Figure 5
Mounting Clamp (HS3-PMC)
The clamp can be used to securely hold the probe body, and provides a 1/4" 20 UNC
thread to mount it to a fi xed surface.
It is recommended that the HygroSmart HS3 Probe is installed with the sensor and fi lter
assembly facing downwards.
55.5mm
2.19”
HS3-PE PAA-000002 HS3-PE PAA-000002
Figure 6
Probe Wall Mounting
2.4.4 Duct Mounting
When installing the HS3 Probe into a duct, ensure that the probe is inserted as far as
possible into the environment to be measured.
If the measurement environment is pressurized, then follow the guidelines in 2.4.5.
Michell Instruments
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HS3-PE PAA-000002 HS3-PE PAA-000002
55.5mm
2.19”
Figure 7
Duct Mounting
HS3-PE PAA-000002 HS3-PE PAA-000002
55.5mm
2.19”
INSTALLATION
HS3
000002
!
2.4.5 Pressurized Environment Installation
The HS3 Probe is a solid assembly with no internal air cavities; this ensures that an
external pressure of up to 10 barg will cause no damage to the probe.
The probe can be installed into pressurized environments by two different methods:
1. Through a vessel or duct wall using the Probe Metal Gland sealing
accessory.
2. Mounted entirely within the pressurized vessel.
HygroSmart HS3 User’s Manual
The Probe Metal Gland (HS3-PMG) is shown in
Figure 6.
It is designed to be installed in
the wall of the pressure vessel by the M25 x 1.5 thread on the rear (1). The O-ring (2)
provides the pressure seal. The probe can then be installed, and the gland tightened
until the shaft of the probe rotates with the turn of the nut.
2
1
Figure 8
Probe Metal Gland
For safety, always ensure that the probe is tethered to the vessel wall or the gland itself.
A tether can be attached to the probe around the base of the M12 mating connector,
see
Figure 7 f
or details.
HS3-PE PAA-000002
-PE PAA-
Figure 9
Securing Tether
When installing probe using the sealing gland, always ensure
that the securing tether is fi tted before applying pressure!
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HygroSmart HS3 User’s Manual
2.4.6 Electrical Requirements
The HygroSmart HS3 Probe requires a supply voltage from 5 to 28 V DC.
2.4.7 Electrical Connections
The electrical connections, as seen when looking at the base of the probe, are shown
in the following schematic:
OPERATION
Modbus Analog Cable Color
1 Comms A Output 1 Brown
2 Comms B Output 2 White
3 0 V N/C Blue
4 +5 V to +28 V +5 V to +28 V Black
5 0 V 0 V Gray
Note: M12 mating connector/cables are not supplied with the Probe, but can
be ordered as an accessory. They are available in 2, 5 & 10 meter lengths.
2.4.8 Digital Serial Output
The connections for Modbus RTU over RS485 communications are detailed in
In order to enable digital comms, both pins 3 & 5 should be grounded. See Appendix B for
mire details.
Figure 10
Electrical Connections
21
5
34
Figure
10.
NOTE: The probe will not output digital and voltage signals simultaneously.
2.4.9 Analog Voltage Outputs
The HS3 Probe will be set up, when ordered, to one of the following selection of voltage
outputs:
These voltage outputs can be reconfi gured at any time using one of the available
Maintenance Kits, in conjunction with the HS3 Probe Application Software.
0 - 1 V
0 - 2.5 V
0 - 5 V
0 - 10 V
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