Shaw SDHmini Series User manual
Model SDHmini
Dewpoint Meter
Instrucon Manual
SDHmini User Manual - Iss 1
Unpacking Your Shaw Moisture Meters SDHmini....................................... 4
General Descripon...................................................................................... 4
Ranges.......................................................................................................... 5
Symbols Table................................................................................................ 6
Lithium-ion Cell - Baery.............................................................................. 6
Pressure Exposure........................................................................................ 6
Installing the Air/Gas Sampling System........................................................ 7
Gases to Avoid.............................................................................................. 7
Piping Installaon Schemac....................................................................... 8
Piping Schemac Component Index........................................................... 9
Purging the Sample Connecon................................................................. 9
Sampling Informaon................................................................................. 10
Sample Connecons................................................................................... 10
Sample Condioning.................................................................................. 10
Normal Operaons..................................................................................... 11
Powering On/O......................................................................................... 11
Graphical Viewing Opons......................................................................... 11
Display Opons........................................................................................... 12
Choice of Units........................................................................................... 12
Calibraon.................................................................................................. 13
Calibraon Checking................................................................................... 13
Auto Calibraon (AutoCal).......................................................................... 14
CalSet.......................................................................................................... 15
Calibraon Notes........................................................................................ 16
Addional Informaon............................................................................... 17
Addional Sensor Sengs.......................................................................... 17
Sensor Type................................................................................................ 17
Selecng Gas Types.................................................................................... 17
Selecng Gas Molecular Weights............................................................... 18
Pressure...................................................................................................... 18
Non Measurement Related Conguraon Funcons................................. 19
Changing the Date...................................................................................... 19
Changing the Time...................................................................................... 19
Changing Internaonal Sengs.................................................................. 20
Hotkeys....................................................................................................... 21
Bluetooth Setup.......................................................................................... 21
Desiccant and Head Seal Replacement....................................................... 23
Temperature............................................................................................... 24
Response Time........................................................................................... 24
Guarantee................................................................................................... 24
Basic Denions......................................................................................... 24
Problem Guide............................................................................................ 25
SDHmini Specicaons............................................................................... 26
SDHmini General Assembly Diagram.......................................................... 27
Index
1.0
1.1
1.2
2.0
2.1
2.2
3.0
3.1
3.2
3.3
4.0
4.1
4.2
4.3
5.0
5.1
5.2
5.3
5.4
6.0
6.1
6.2
6.3
6.4
7.0
7.1
7.2
7.3
7.4
8.0
9.0
9.1
9.2
9.3
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
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1.0 Unpacking Your Shaw Moisture Meters SDHmini
Please examine the SDHmini package for any damage or mishandling. If any
damage is evident please nofy the carrier and the Shaw Moisture Meters
representave from where this unit was purchased.
You should have received (if ordered):
● 1 model SDHmini instrument
● 1 carry case
● 1 Allen key
● 1 instrucon manual
● 1 pressure dewpoint circular calculator
● 1 two metre length of PTFE tubing
● 1 USB charging cable
If anything is missing please contact your distributor immediately.
1.1 General Descripon
The SDHmini is a micro-controller based baery operated dewpoint hygrometer
with state of the art features and enhancements with support of USB and
oponal Bluetooth interfaces for communicang with PC and also support for
thermal printer over Bluetooth (as opon).
The SDHmini is a baery powered instrument. It is a fully self-contained unit
incorporang the moisture sensor, signal condioning circuitry, memory
management, graphics display, membrane keyboard, real me clock, on-board
baery and charger circuit.
The SDHmini operaon is controlled by a user-friendly soware interface
incorporang mulple menus, hot key combinaons, informaon displays and
control funcons.
Available in the following two oerings:
● Basic
● Basic + Bluetooth + Logging
4
The GUI features three main viewing screens, digital, graphical (historical readings
in a scrolling strip chart) and a meter (a tradional moving coil). There is also a
secondary display in the top right which allows display of readings in alternave
units of measurement.
The unit operates with the following 10 language opons: English, German,
French, Spanish, Portuguese, Russian, Italian, Chinese, Japanese and Korean.
A full colour graphics LCD display with 320 x 240 resoluon landscape and a 6 key
input including an on/o facility.
A single USB port allows
● Charging of the baery (Li-ion) when connected to PC or dedicated
power supply
● Uploading of new rmware to the unit
● Uploading of calibraon and setup data from dedicated PC
soware
● Downloading logged data les and real me data from the unit
The displayed units can be changed on both the primary and secondary displays for
the selectable moisture unit e.g. °C, °F, g/m3, ppm(v), ppm(w), ppb and lbs/MMscf.
The inbuilt memory, stores in excess of 150,000 readings, including moisture and
pressure compensated moisture readings with user selectable logging intervals
from ve seconds to one hour and real-me data logging graphical formats. Data is
stored under customer generated le names and stored data les can be reviewed
graphically on the unit. The rechargeable baery has in excess of 150 hours logging
capability on a minimum logging interval and is fully recharged in 12 hours.
1.2 Ranges
SDHmini(r): Range
Purple (P): -100 °C to 0 °C dewpoint, 0 - 6000 PPM
Silver (S): -100 °C to -20 °C dewpoint, 0 - 1000 PPM
Red (R): -80 °C to -20 °C dewpoint, 0 - 1000 PPM and 0 - 10 on TR version
Grey (G): -80 °C to 0 °C dewpoint, 0 - 6000 PPM and 0 - 10 on TR version
Blue (Bl): -80 °C to +20 °C dewpoint, 0 - 23,000 PPM (ManualCal)
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2.0 Symbols Table
2.1 Lithium-ion Cell - Baery
The SDHmini is powered by a single lithium-ion cell.
The cell is not eld replaceable by the user as it is completely enclosed within
the instrument. However, the cell may be exchanged by an authorised agent
who has received the necessary training, support systems and accreditaon. It is
recommended to only use the USB power supply supplied with the instrument.
It is recommended that the SDHmini be put on charge overnight when the unit is
rst received.
To aain maximum cell life the SDHmini should always be charged at room
temperature. The discharging cell life (hours of use from a fully charged cell) will
reduce when used in cold condions.
2.2 Pressure Exposure
6
Baery Note: Please refer to secon 2.1
Rang of instrument is less than 1 W in operaon. Charging
voltage is 5 V nominal. Charging input is however addionally
protected to Um 250 Vrms.
The symbol indicates that the device contains a baery which
may be charged via the neighbouring connector.
Pressure Note: Please refer to secon 2.2
!
The maximum pressure to which the telescopic measuring
head is exposed should not be more than
0.3 bar, 4 psi
Exposing the measuring head to higher pressures may
damage the instrument and result in injury to the operator
or other personnel in the area.
!
3.0 Installing the Air/Gas Sampling System
The Piping Installaon Schemac diagram (see secon 3.2) shows all components,
which could be used in a dry gas measurement applicaon. Although not all the
items shown will be required for every installaon.
The SDHmini should be placed on a stable surface prior to connecng to the
sample pipework. Care should be taken to ensure that the sample presented
to the SDHmini is not contaminated with any component that will damage,
contaminate or aect in a way that will impair the unit’s accuracy.
The ow rate, although not crical to the sensor measurement, should be low
enough to avoid abrasion to the sensor surface without being so low as to extend
the SDHmini response me to an unacceptable level. In general, a ow rate of
between 2 and 5 litres/min at NTP will give the right balance.
The SDHmini is designed to be operated at atmospheric pressure with a
maximum of 0.3 bar.
3.1 Gases to Avoid
The moisture sensors are suitable for any dierent industrial and research
applicaons. Most gases can be checked for their moisture content with no
need for the calibraon to be altered when changing between dierent gases,
as the sensor operates only with reference to the water vapour content.
There are however, some gases that must be avoided as they are not compable
with the material of construcon of the sensor. Ammonia (NH3), Ozone (O3) and
Chlorine (Cl) must be avoided at all mes, even in small quanes. Hydrogen
Chloride (HCl) also aacks the sensors very quickly. Some, less aggressive acidic
gases such as Sulphur Dioxide (SO2) can be monitored as long as the moisture
content is low, generally less than 100ppm(v). If in doubt, please ask your
supplier.
Sulphur Hexauoride (SF6) has no eect on the sensor. If the gas has been
exposed to arcing, however, it is possible that various acidic species will have
been formed that will corrode the sensor. When tesng SF6that may have been
arced, therefore, an acidity test should be carried out rst; if the gas proves to
be acidic then the moisture test should not be carried out.
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3.2 Piping Installaon Schemac
8
3.3 Piping Schemac Component Index
Sample Isolaon Valve - This is a recommended item as it allows access
to the sample system without interrupng the main process line.
Sample Tube – This should be stainless steel for dry air or gas
applicaons but copper or carbon steel can be used where weer gases
are to be measured. If any secon of the sample tube must be exible
then PTFE should be used. In most cases, 3 mm OD (⅛”) is sucient as it
provides good system response me with minimum ow. 6 mm OD (¼”)
tube can be used where pressure drops across the 3 mm tube are too
high.
Filter Unit – A lter unit is recommended when the samples are likely
to contain parculate maer. If the air/gas sample contains heavy
hydrocarbon condensate, the lter must be of the coalescing type with a
drain. The lter unit should be posioned as close to the sample point as
praccal.
Pressure Reducon Valve or Pressure Regulator – the sample is
measured at atmospheric pressure requiring that valve 4 is ed to the
system.
Flow Control Valve.
Sample Connecon.
SDHmini.
Flow Indicator – The recommended sample ow is 2 to 5 L/M.
Sample Exhaust – The exhaust is vented to atmosphere or returned to an
atmospheric pressure line.
4.0 Purging the Sample Connecon
Refer to the Piping Installaon Schemac in secon 3.2.
It is advisable to carry out an inial purge of the sample loop before connecng
the SDHmini, in order to avoid the possibility of sensor damage on start-up.
Open the sample isolaon valve (1) slowly, unl there is a small ow of air/gas
at atmospheric pressure from the pressure reducon valve (4) into SDHmini line.
Allow the air/gas to exhaust through the sample connecon (9).
The SDHmini is not ow sensive, however, the sample ow needs to be
enough to purge the sensor head eecvely, so anything less than 1 litre/min
would mean that the instrument would take too long to sele to a stable
1.
2.
3.
4.
5.
6.
7.
8.
9.
9
reading. The ow should not be so high that the gas velocity could physically
damage the sensor or cause back-pressure in the sensor head, so should not
exceed approximately 10 litres/min.
Allow this purge to connue for two minutes to remove any residual moisture
from the sample pipe work and components. Check that no liquid or parculate
contaminaon, which could damage the sensor, is passing through the sample
pipe. Direcng the sample onto a piece of white paper (such as a lter paper)
will make it easier to see any dust or oil mist in the sample.
4.1 Sampling Informaon
Refer to the Piping Installaon Schemac in secon 3.2.
The SDHmini sensor will respond to the water vapour pressure of a gas in
contact with it. It is important to ensure that the gas passing through the
sensor head is the same as the gas being sampled.
4.2 Sample Connecons
The SDHmini is supplied with two connecons: a “r tree” on one side and a
Swagelok compression ng for ¼”, ⅛”, or 6 mm OD pipe (as specied on your
order) on the other. Either can be used as the inlet connecon (6).
PTFE and stainless steel are recommended materials for sample pipes. Some
specialist exible tubing may be suitable as sample pipe but common exible
tubing such as PVC, nylon, polythene or rubber, should not be used, as they are
permeable and water vapour from the atmosphere will diuse through them
into the sample gas.
A 2 m PTFE sample pipe is supplied for use with the “r tree” connecon. The
rst me this is used it is advisable to warm the end that will go over the “r
tree” for a few seconds with a heat source to soen it slightly, which helps to
get a gas ght seal.
4.3 Sample Condioning
The main principle when considering the presentaon of the gas sample to the
SDHmini dewpoint meter is to keep the sample system as simple as possible
and of minimum swept volume, so that it has the least possible inuence on
the gas sample.
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This manual suits for next models
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