Shaw SDHmini Manual de usuario
Model SDHmini
Dewpoint Meter
Instrucon Manual
3006 - SDHmini User Manual - Iss 1.1
Contents
1
2
3
4
5
6
Introducon ................................................................................ 5
1.1 Unpacking Your Shaw Moisture Meters SDHmini ................ 5
1.2 General Descripon ............................................................. 5
Important Informaon ................................................................ 6
2.1 Symbols Table ...................................................................... 6
2.2 Lithium-ion Cell - Baery ...................................................... 6
2.3 Pressure Exposure ................................................................ 7
Installaon .................................................................................. 7
3.1 Gases to Avoid ..................................................................... 7
3.2 Installing the Air/Gas Sampling System ............................... 7
3.3 Piping Installaon Schemac ............................................... 8
3.4 Piping Schemac Component Index .................................... 9
3.5 Purging the Sample Connecon .......................................... 9
3.6 Using the SDHmini to Take a Moisture Reading ................ 10
3.7 Desiccant Dry-Down Technology ....................................... 11
3.8 Sample Connecons .......................................................... 11
3.9 Pressure and Flow Control ................................................ 12
3.10 Parculate Contaminaon ............................................... 12
3.11 Liquid Contaminaon ...................................................... 12
Normal Operaons ................................................................... 13
4.1 Powering On/O ............................................................... 13
4.2 Graphical Viewing Opons ................................................ 13
4.3 Display Opons .................................................................. 13
4.4 Choice of Units .................................................................. 14
Calibraon ................................................................................ 15
5.1 Auto Calibraon (AutoCal) ................................................ 15
5.2 Calibraon Setpoint (CalSet) ............................................. 16
5.3 Calibraon Procedure Error Messages .............................. 17
Sensor Related Sengs ............................................................. 17
6.1 Sensor Type ....................................................................... 17
6.2 Selecng Gas Types ........................................................... 17
6.3 Selecng Gas Molecular Weights ...................................... 18
6.4 Pressure ............................................................................. 18
Contents
7
8
9
10
11
12
13
Non Measurement Related Conguraon Funcons ................. 19
7.1 Changing the Date ............................................................. 19
7.2 Changing the Time ............................................................. 19
7.3 Changing Internaonal Sengs ........................................ 19
7.4 Hotkeys .............................................................................. 20
Installing the SDHmini User Tool ............................................... 21
8.1 Extracng the SDHmini User Tool Soware from the USB
Flash Drive (Memory Sck) ................................................ 21
8.2 Extracng the SDHmini User Tool Soware from the
Instrument .......................................................................... 22
Connecng the SDHmini and SDHmini User Tool ...................... 24
Using the SDHmini User Tool .................................................... 25
10.1 Menu items ...................................................................... 25
10.1.1 File - SDHmini Report ............................................... 25
10.1.2 Language .................................................................. 25
10.1.3 Help .......................................................................... 26
10.2 Instrument Live Reading ................................................... 26
10.3 Instrument Stac Informaon .......................................... 26
10.4 Ulies ............................................................................. 27
10.5 Sengs ............................................................................. 28
10.6 Firmware Update ............................................................. 29
10.7 Factory Reset .................................................................... 30
Addional Informaon ............................................................. 31
11.1 Desiccant and Head Seal Replacement ........................... 31
11.2 Temperature .................................................................... 32
11.3 Response Time ................................................................ 32
11.4 Guarantee ........................................................................ 32
11.5 Basic Denions .............................................................. 32
11.6 Problem Guide ................................................................. 33
SDHmini Specicaons .............................................................. 34
SDHmini General Assembly Diagram ......................................... 35
1 Introducon
1.1 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 two metre length of PTFE tubing
1 USB charging cable
1 Fir Tree ng plus 1 x ngs as
ordered
If anything is missing please contact your distributor immediately.
1.2 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 for
communicang with PC.
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 graphical user interface 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 key.
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) and lb/MMSCF.
5
●
●
●
●
●
●
●
●
●
●
1 AC/DC adaptor
1 pressure dewpoint circular
calculator
1 USB ash drive with SHAW
SDHmini User Tool soware
1 instrucon manual
The SDHmini sengs can be adjusted by a user-friendly soware interface
incorporang mulple menus, hot key combinaons, informaon displays and
control funcons.
Use the supplied USB cable, aach between the PC and the instrument, an
automac connecon over USB is established.
The USB port allows:
● Charging of the baery (Li-ion) when connected to PC or dedicated
power supply
● Downloading of new rmware to the unit
● Downloading of setup data from dedicated PC soware
The view panel allows access to many of the features, sengs and informaon
pages within the instrument.
A micro SD card is ed to the instrument, the contents of which can be explored
by clicking the SD card icon in the boom le of the view panel. The contents may
include user manuals, service notes, calibraon data sheets, rmware backups etc.
2 Important Informaon
2.1 Symbols Table
6
2.2 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. Switch
on the instrument to check if fully charged.
The symbol indicates that the device contains a baery which may
be charged via the USB connector.
Rang of instrument is less than 1 W in operaon. Charging
voltage is 5 V nominal.
3 Installaon
3.1 Gases to Avoid
The SHAW moisture sensors are suitable for many 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 (Cl2) 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.
3.2 Installing the Air/Gas Sampling System
The Piping Installaon Schemac diagram (see secon 3.3) 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 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.
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.
7
2.3 Pressure Exposure
!
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 normal temperature and pressure will give the right
balance.
The SDHmini is designed to operate at atmospheric pressure with a maximum of
0.3 bar.
3.3 Piping Installaon Schemac
8
MAIN
PROCESS
LINE
1
3
2
4567
8
9
a.
b.
The sample point should be on the upper surface of the horizontal
pipe or from a vercal secon of pipe, wherever possible.
The sample tube should run upwards from the sample point. If
this is not possible, then an inspecon port or drain tap should be
installed at the lowest point in the sample system.
Notes
3.4 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.
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.
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.
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/min.
Sample Exhaust – The exhaust is vented to atmosphere or returned to an
atmospheric pressure line.
3.5 Purging the Sample Connecon
Refer to the Piping Installaon Schemac in secon 3.3.
It is advisable to carry out an inial purge of the sample loop without connecng
the instrument, 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). Allow the air/gas to
exhaust through the sample connecon (9).
Connue this 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.
1.
2.
3.
4.
5.
6.
7.
8.
9.
9
Connect the SDHmini. The SDHmini is not ow sensive, however, the sample
ow needs to be enough to ll the sensor head with gas eecvely, so anything
less than 1 litre/min would mean that the instrument would take too long to sele
to a stable 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.
3.6 Using the SDHmini to Take a Moisture Reading
The rst purpose of the SDHmini is to provide a rapid, easy and reliable means of
carrying out moisture content measurement of gases. To ensure rapid response
the sensor is kept dry by surrounding the sensor with desiccant in the head
assembly when it is not in use.
Aer purging the system to be monitored t the SDHmini sample pipe to the
sample connecon (6). Allow the gas to purge for a further two minutes with the
head down. Restrict the outlet of the SDHmini (7) by placing a nger over the
sample exhaust (9), so that the pressure of the sample lis the telescopic head.
As soon as the head is fully extended remove the nger, to prevent pressure build
up. Pull gently on the head to make sure it is fully extended. If there is not enough
pressure to li the head assembly, assist it by pulling it up, do this very slowly so
that ambient air is not drawn in through the outlet.
The sensor will respond to the moisture level present in the sampled gas. The
displayed moisture value will connue to change unl the sensor reaches
equilibrium at which point the displayed value is representave of the moisture
level in the sampled gas. When a reading has been taken and the test is nished,
push down the telescopic head fully, carefully turn o the sample ow and
disconnect the sample pipe. With the head in the down posion the desiccant will
dry the sensor, ready for the next test.
Note: It is important that the head assembly is either fully up or fully down to
keep the desiccant isolated from the ambient air so avoiding weng it. When the
instrument is not in use it should be stored with the head in the down posion.
10
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