Michell Instruments HG-1 Operating Manual
HG-1
HG-1 Humidity Generator
DRY FLOW WET FLOW
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INTERNAL
GAS SUPPLY
TEST
CHAMBER
GAS IN
COMPRESSED
AIR
240V
Display Control
Outputs
Communications
Humidity Calibrator
User’s Manual
97053 Issue 11, December 2010 Michell Instruments
Inside front cover (blank)
HG-1 User’s Manual
HG-1 Humidity Generator
DRY FLOW WET FLOW
1
.
5
0
.
5
2
1
2
.
5
0
.
2
0
.
4
0
.
6
0
.
8
1
.
0
1
.
2
1
.
4
INTERNAL
GAS SUPPLY
TEST
CHAMBER
GAS IN
COMPRESSED
AIR
240V
Display Control
Outputs
Communications
HG-1
© 2010 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.
97053 Issue 11, December 2010 iii Michell Instruments
HG-1 User’s Manual
97053 Issue 11, December 2010 iv Michell Instruments
Contents
Safety ..............................................................................................................................................vi
Electrical Safety .........................................................................................................................vi
Toxic Materials ..........................................................................................................................vi
Repair and Maintenance.............................................................................................................vi
Calibration ................................................................................................................................vi
Safety Conformity ......................................................................................................................vi
Abbreviations ...................................................................................................................................vii
Warnings ........................................................................................................................................ viii
Recycling Policy ............................................................................................................................... viii
WEEE And RoHS Compliance ..............................................................................................................ix
Calibration Facilities ...........................................................................................................................ix
Manufacturing Quality ........................................................................................................................ix
Warranty .......................................................................................................................................... x
Return Policy ..................................................................................................................................... x
1 INTRODUCTION ........................................................................................................................ 1
1.1 General .......................................................................................................................... 1
1.2 Calibration ...................................................................................................................... 1
2 INSTALLATION .......................................................................................................................... 2
2.1 Filling the Saturator ....................................................................................................... 2
2.2 Gas Connections ............................................................................................................ 2
2.3 Electrical Connections ..................................................................................................... 2
2.3.1 Power Supply ............................................................................................................. 2
2.3.2 Current Outputs .......................................................................................................... 3
2.3.3 Relay Outputs ............................................................................................................. 3
2.3.4 Digital Communications ............................................................................................... 3
3 OPERATION .............................................................................................................................. 4
3.1 Operating Overview ....................................................................................................... 4
3.2 Dynamic Contamination Correction (DCC) ......................................................................... 5
3.3 Data Hold Phase ............................................................................................................. 6
3.4 Display Screens .............................................................................................................. 7
3.5 Operating Procedure ....................................................................................................... 9
4 MAINTENANCE .........................................................................................................................10
4.1 Re-Filling the Saturator System .......................................................................................10
4.2 Gas Drying Unit Replacement .........................................................................................10
4.3 Cleaning the Cooled Mirror Sensor ..................................................................................11
4.4 Re-Calibration of the Humidity Calibrator ........................................................................12
5 APPLICATION SOFTWARE .........................................................................................................13
5.1 Virtual Hygrometer ........................................................................................................13
5.2 Parameter Setup ............................................................................................................14
5.3 Charting and Logging .....................................................................................................16
5.4 Statistics .......................................................................................................................18
5.5 Control Parameters ........................................................................................................18
5.6 Calibration Correction .....................................................................................................19
5.7 Change of Password ......................................................................................................21
HG-1 User’s Manual
Michell Instruments v 97053 Issue 11, December 2010
Figures
Figure 3.1 Graphical representation of system phases ..............................................................5
Figure 3.2 Graphical representation of the Data Hold Phase ......................................................6
Figure 3.3 Optidew Display Screens and Navigation .................................................................8
Figure 4.1 Potentiometer Location ........................................................................................11
Figure 5.1 Virtual Hygrometer window ..................................................................................13
Figure 5.2 Parameter Setup window ......................................................................................14
Figure 5.3 Chart/Log Control Panel window ...........................................................................16
Figure 5.4 Chart window ......................................................................................................17
Figure 5.5 Basic Statistics window .........................................................................................18
Figure 5.6 Extracts from Calibration Certicates .....................................................................19
Figure 5.7 Calibration Correction window ...............................................................................21
Figure 5.8 Change Password window ....................................................................................21
Figure A.1 HG-1 Set-Up Diagram ...........................................................................................24
Figure A.2 HG-1 Flow Diagram .............................................................................................. 25
Tables
Table 2.1 Channel 1 and 2 Output Connections .......................................................................3
Table 2.2 Relay Output Connections .......................................................................................3
Table 2.3 RS232/RS485 Connections .......................................................................................3
Table 3.1 Guide to setting owrates for required RH or dew point ............................................ 9
Appendices
Appendix A Technical Specications ......................................................................................... 23
Appendix B List of Worldwide Michell Instruments’ Ofces ......................................................... 27
HG-1 User’s Manual
97053 Issue 11, December 2010 vi Michell Instruments
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. Refer to
Appendix B for details of Michell Instruments’ worldwide ofces’ contact information.
Calibration
The recommended calibration interval for the HG-1 is one year. The instrument should be returned to the
manufacturer, Michell Instruments, or one of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Further details of
applied standards may be found in the product specication.
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Michell Instruments vii 97053 Issue 11, December 2010
Abbreviations
The following abbreviations are used in this Manual:
A Ampere
AC alternating current
bar pressure unit (=100 kP or 0.987 atm)
ºC degrees Celsius
ºF degrees Fahrenheit
dp dew point
DC direct current
ft/sec feet per second
g/kg grams per kilogram
g/m3 grams per cubic meter
in inch(es)
kg kilogram(s)
lb pound
l/min liters per minute
m meter(s)
mA milliampere
max maximum
min minimum
mm millimeters
m/sec meters per second
% percentage
PSI pounds per square inch
RS232 serial data transmission standard
RS485 serial data transmission standard
SCFH standard cubic feet per hour
temp temperature
V Volts
Ω Ohms
HG-1 User’s Manual
97053 Issue 11, December 2010 viii Michell Instruments
Warnings
The following general warnings listed below are applicable to this instrument. They are 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.
Where this symbol appears in the following sections it is used
to indicate areas of potential risk of electric shock.
Recycling Policy
Michell Instruments is concerned with the protection of the environment. It is our commitment to reduce
and eliminate from our operations, wherever possible, the use of substances which may be harmful to the
environment. Similarly, we are increasingly using recyclable and/or recycled material in our business and
products wherever it is practical to do so.
The product that you have purchased may contain recyclable and/or recycled parts and we will be happy to
provide you with information on these components if required.
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Michell Instruments ix 97053 Issue 11, December 2010
WEEE And RoHS Compliance
The Waste Electronic and Electrical Equipment (WEEE) Directive, and the Restriction of Hazardous Substances
(RoHS) Directive place rules upon European manufacturers of electrical and electronic equipment. The
directives’ aim is to reduce the impact that electronic devices have on the environment.
Michell products are currently exempt from the RoHS directive, however all future products will be developed
entirely using compliant materials. Furthermore, Michell is taking active steps to remove non-compliant
materials and components from existing products wherever possible.
Michell is in full compliance with the WEEE Directive (Registration No. WEE/JB0235YW). Customers may be
required to return certain instruments for treatment at the end of their working life.
June 2010
Calibration Facilities
Michell Instruments’ calibration facilities are among the most sophisticated in the world and have been
recognized for their excellence.
Traceability to the National Physical Laboratory (NPL) UK is achieved through our UKAS Accreditation
(Number 0179). This covers dew point over the range -90 to +90°C (-130 to +194°F) and also Relative
Humidity.
Dew-point calibrations are also traceable to the National Institute for Standards & Technology (NIST) USA over
the range -75 to +20°C (-103 to +68°F).
NOTE: Standard traceable calibration certicates for instruments and sensors are not issued
under our UKAS accreditation. UKAS certicates are usually to special order and are clearly
identied.
Manufacturing Quality
Michell Instruments is registered with the British Standards Institute for Quality Assurance to:
BS EN ISO 9001: 2008
Rigorous procedures are performed at every stage of production to ensure that the materials of construction,
manufacturing, calibration and nal test procedures meet the requirements laid down by our BSI approved
Quality System.
Please contact Michell Instruments if the product does not arrive in perfect working order.
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97053 Issue 11, December 2010 x Michell Instruments
Warranty
Unless otherwise agreed, the Supplier warrants that, as from the date of delivery for a period of 12 months
the goods and all their component parts, where applicable, are free from any defects in design, workmanship,
construction or materials.
The Supplier warrants that the services undertaken shall be performed using reasonable skill and care, and of
a quality conforming to generally accepted industry standards and practices.
Except as expressly stated, all warranties, whether express or implied, by operation of law or otherwise, are
hereby excluded in relation to the goods and services to be provided by the Supplier.
All warranty services are provided on a return to base basis. Any transportation costs for the return of a
warranty claim shall reside with the Customer.
Return Policy
If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be
completed:
Notify a Michell Instruments’ distributor, giving full details of the problem, the 1.
model variant and the serial number of the product.
If the nature of the problem indicates the need for factory service then the 2.
instrument should be returned to Michell Instruments, carriage prepaid,
preferably in the original packaging, with a full description of the fault
and the customer contact information.
Upon receipt, Michell Instruments will evaluate the product to determine the 3.
cause of the malfunction. Then, one of the following courses of action will
be taken:
If the fault is covered under the terms of the warranty, the instrument •
will be repaired at no cost to the owner and returned.
If Michell Instruments determines that the fault is not covered under •
the terms of the warranty, or if the warranty has expired, an estimate
for the cost of the repairs, at standard rates, will be provided. Upon
receipt of the owner’s approval to proceed, the product will be repaired
and returned.
HG-1 User’s Manual
Michell Instruments 1 97053 Issue 11, December 2010
1 INTRODUCTION
1.1 General
The Michell Humidity Calibrator is a high precision, yet simple to operate, humidity calibration system designed
for calibrating relative humidity instruments over the range 2 to 90%RH (-30 to 20°Cdp (-22 to 68°Fdp) at
ambient temperature and atmospheric pressure.
A Michell Optidew Dew-Point Transmitter is utilized to function as a reference instrument.
The Humidity Calibrator consists of the following:
a mini compressor and gas drying unit (to provide its own dry gas supply) or •
alternatively an external dry compressed air supply
owmeters including valves (to indicate and mix gas ows) •
a saturator system (to provide the wet gas supply) •
a calibration test chamber (for housing humidity instruments under test) or •
alternatively a gas outlet port (for feeding the generated sample gas to an
external humidity instrument under test)
The generated humidity is visible through the instrument display and analog outputs.
Humidities are generated by the proportional mixing of wet and dry gas ows through calibrated owmeters
and ne metering valves. The generated sample gas is measured by the Optidew cooled mirror dew-point
sensor situated within the calibration test chamber along with other humidity measuring ‘instruments under
test’.
The Humidity Calibrator is a fully portable, self-contained instrument requiring only mains power and an
occasional top-up of the saturator with distilled water for operation. Access for maintenance is made available
through the removable top and rear panel of the instrument.
1.2 Calibration
A Certicate of Dew-Point Calibration is provided with the instrument, which means that the instrument
has been calibrated against Michell Calibration Standards. It is also possible to provide a UKAS Calibration
Certicate giving direct calibration traceability of the instrument to NPL Standards. Please contact Michell
Instruments for further details.
HG-1 User’s Manual
97053 Issue 11, December 2010 2 Michell Instruments
2 INSTALLATION
The Humidity Calibrator is supplied with a power cable. Please check that all items listed on the packing check
list have been received.
The Humidity Calibrator enclosure is designed for bench top mounting in a laboratory environment. Allow
sufcient clearance at the rear of the enclosure for maintenance and ventilation.
2.1 Filling the Saturator
Before operation, the saturator requires lling with distilled water.
Carefully unscrew and remove the lling port knurled nut and red plastic cap located on the rear panel of the
unit.
Fill the saturator with clean distilled water to a level indicated on the label (viewed through the rear panel).
The water level should be kept between the minimum and maximum marks on the label. Too little water will
reduce the efciency of the saturator, too much will cause erratic operation.
Replace the lling port red plastic cap and knurled nut.
2.2 Gas Connections
All gas connections to/from the calibrator are 6mm OD Swagelok® tube ttings.
2.3 Electrical Connections
2.3.1 Power Supply
A single phase mains power supply is required to operate this unit as indicated by the yellow label located on
the front panel of the unit. The user cannot change the power supply voltage as this involves replacing internal
electromechanical parts.
The power supply connection is a 3-pin IEC plug located on the front panel of the unit.
A 3-core power cable is provided, the free end of which should be wired to a suitable earthed plug or directly
via a fused power spur. Power cable conductors are color coded according to the convention:
Brown L (Live)
Blue N (Neutral)
Green/Yellow E (Earth)
WARNING
This instrument must be connected to electrical earth for safety
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