Shaw SDHmini Series User manual

Model SDHmini
Dewpoint Meter
Instrucon Manual
SDHmini User Manual - Iss 1

Unpacking Your Shaw Moisture Meters SDHmini....................................... 4
General Descripon...................................................................................... 4
Ranges.......................................................................................................... 5
Symbols Table................................................................................................ 6
Lithium-ion Cell - Baery.............................................................................. 6
Pressure Exposure........................................................................................ 6
Installing the Air/Gas Sampling System........................................................ 7
Gases to Avoid.............................................................................................. 7
Piping Installaon Schemac....................................................................... 8
Piping Schemac Component Index........................................................... 9
Purging the Sample Connecon................................................................. 9
Sampling Informaon................................................................................. 10
Sample Connecons................................................................................... 10
Sample Condioning.................................................................................. 10
Normal Operaons..................................................................................... 11
Powering On/O......................................................................................... 11
Graphical Viewing Opons......................................................................... 11
Display Opons........................................................................................... 12
Choice of Units........................................................................................... 12
Calibraon.................................................................................................. 13
Calibraon Checking................................................................................... 13
Auto Calibraon (AutoCal).......................................................................... 14
CalSet.......................................................................................................... 15
Calibraon Notes........................................................................................ 16
Addional Informaon............................................................................... 17
Addional Sensor Sengs.......................................................................... 17
Sensor Type................................................................................................ 17
Selecng Gas Types.................................................................................... 17
Selecng Gas Molecular Weights............................................................... 18
Pressure...................................................................................................... 18
Non Measurement Related Conguraon Funcons................................. 19
Changing the Date...................................................................................... 19
Changing the Time...................................................................................... 19
Changing Internaonal Sengs.................................................................. 20
Hotkeys....................................................................................................... 21
Bluetooth Setup.......................................................................................... 21
Desiccant and Head Seal Replacement....................................................... 23
Temperature............................................................................................... 24
Response Time........................................................................................... 24
Guarantee................................................................................................... 24
Basic Denions......................................................................................... 24
Problem Guide............................................................................................ 25
SDHmini Specicaons............................................................................... 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 nofy the carrier and the Shaw Moisture Meters
representave from where this unit was purchased.
You should have received (if ordered):
● 1 model SDHmini instrument
● 1 carry case
● 1 Allen key
● 1 instrucon 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 Descripon
The SDHmini is a micro-controller based baery operated dewpoint hygrometer
with state of the art features and enhancements with support of USB and
oponal Bluetooth interfaces for communicang with PC and also support for
thermal printer over Bluetooth (as opon).
The SDHmini is a baery powered instrument. It is a fully self-contained unit
incorporang the moisture sensor, signal condioning circuitry, memory
management, graphics display, membrane keyboard, real me clock, on-board
baery and charger circuit.
The SDHmini operaon is controlled by a user-friendly soware interface
incorporang mulple menus, hot key combinaons, informaon displays and
control funcons.
Available in the following two oerings:
● 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 tradional moving coil). There is also a
secondary display in the top right which allows display of readings in alternave
units of measurement.
The unit operates with the following 10 language opons: English, German,
French, Spanish, Portuguese, Russian, Italian, Chinese, Japanese and Korean.
A full colour graphics LCD display with 320 x 240 resoluon landscape and a 6 key
input including an on/o facility.
A single USB port allows
● Charging of the baery (Li-ion) when connected to PC or dedicated
power supply
● Uploading of new rmware to the unit
● Uploading of calibraon and setup data from dedicated PC
soware
● 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 baery 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)
5

2.0 Symbols Table
2.1 Lithium-ion Cell - Baery
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 accreditaon. 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 aain 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 condions.
2.2 Pressure Exposure
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Baery Note: Please refer to secon 2.1
Rang of instrument is less than 1 W in operaon. Charging
voltage is 5 V nominal. Charging input is however addionally
protected to Um 250 Vrms.
The symbol indicates that the device contains a baery which
may be charged via the neighbouring connector.
Pressure Note: Please refer to secon 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 Installaon Schemac diagram (see secon 3.2) shows all components,
which could be used in a dry gas measurement applicaon. Although not all the
items shown will be required for every installaon.
The SDHmini should be placed on a stable surface prior to connecng 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 aect in a way that will impair the unit’s accuracy.
The ow rate, although not crical 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 dierent industrial and research
applicaons. Most gases can be checked for their moisture content with no
need for the calibraon to be altered when changing between dierent 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 compable
with the material of construcon of the sensor. Ammonia (NH3), Ozone (O3) and
Chlorine (Cl) must be avoided at all mes, even in small quanes. Hydrogen
Chloride (HCl) also aacks 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 Hexauoride (SF6) has no eect 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 tesng 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.
7

3.2 Piping Installaon Schemac
8

3.3 Piping Schemac Component Index
Sample Isolaon Valve - This is a recommended item as it allows access
to the sample system without interrupng the main process line.
Sample Tube – This should be stainless steel for dry air or gas
applicaons but copper or carbon steel can be used where weer gases
are to be measured. If any secon of the sample tube must be exible
then PTFE should be used. In most cases, 3 mm OD (⅛”) is sucient 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 parculate maer. 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 posioned as close to the sample point as
praccal.
Pressure Reducon Valve or Pressure Regulator – the sample is
measured at atmospheric pressure requiring that valve 4 is ed to the
system.
Flow Control Valve.
Sample Connecon.
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 Connecon
Refer to the Piping Installaon Schemac in secon 3.2.
It is advisable to carry out an inial purge of the sample loop before connecng
the SDHmini, in order to avoid the possibility of sensor damage on start-up.
Open the sample isolaon valve (1) slowly, unl there is a small ow of air/gas
at atmospheric pressure from the pressure reducon valve (4) into SDHmini line.
Allow the air/gas to exhaust through the sample connecon (9).
The SDHmini is not ow sensive, however, the sample ow needs to be
enough to purge the sensor head eecvely, so anything less than 1 litre/min
would mean that the instrument would take too long to sele 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 connue for two minutes to remove any residual moisture
from the sample pipe work and components. Check that no liquid or parculate
contaminaon, which could damage the sensor, is passing through the sample
pipe. Direcng 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 Informaon
Refer to the Piping Installaon Schemac in secon 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 Connecons
The SDHmini is supplied with two connecons: a “r tree” on one side and a
Swagelok compression ng for ¼”, ⅛”, or 6 mm OD pipe (as specied on your
order) on the other. Either can be used as the inlet connecon (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 diuse through them
into the sample gas.
A 2 m PTFE sample pipe is supplied for use with the “r tree” connecon. 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 soen it slightly, which helps to
get a gas ght seal.
4.3 Sample Condioning
The main principle when considering the presentaon 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 inuence on
the gas sample.
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