Model SDHmini-L Dewpoint Meter Instruction Manual 3005 SDHmini-L User Manual - Iss 1.3

1 Introduction 1.1 Unpacking Your SHAW Moisture Meters SDHmini-L Please examine the SDHmini-L package for any damage or mishandling. If any damage is evident please notify the carrier and the SHAW Moisture Meters representative from where this unit was purchased. You should have received (if ordered): ● 1 model SDHmini-L instrument ● 1 carry case ● 1 Allen key ● 1 two metre length of PTFE tubing ● 1 USB charging cable ● 1 Fir Tree fitting plus 1 x fittings as ordered ● 1 AC/DC adaptor ● 1 pressure dewpoint circular calculator ● 1 USB flash drive with SHAW SDHmini User Tool software ● 1 instruction...

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 lbs/MMscf. The SDHmini-L settings can be adjusted by a user-friendly software interface incorporating multiple menus, hot key combinations, information displays and control functions. Use the supplied USB cable, attach between the PC and the instrument, an automatic connection over USB is established. The USB port allows: ● Charging of the battery (Li-ion) when connected to PC or dedicated power supply ● Downloading of new firmware to the unit ●...

2 Important Information 2.1 Bluetooth Certifications This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment - Contains FCC ID:QOQWT41/ QOQWT41u. This device complies with Industry Canada licence-exempt RSS standard(s) Contains IC:5123A-BGTWT41/ 5123A-BGTWT41u. WT41 meets the requirements of the standards below and hence fulfils the requirements of EMC Directive 89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC within CE marking requirement. WT41 has modular certification with certification number R 209-J00047/J00231. 2.2 Symbols Table 2.3...

2.4 Pressure Exposure 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. 2.5 USB Communication Performance Note: The use of the USB communication channel and charging power port within the instrument may result in not all connections to all USB ports on all PCs or laptops being entirely successful. Many USBs ports even within the same PC or laptop differ from each other in electrical hardware or...

3 Installation 3.1 Gases to Avoid The SHAW moisture sensors are suitable for many different industrial and research applications. Most gases can be checked for their moisture content with no need for the calibration to be altered when changing between different 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 compatible with the material of construction of the sensor. Ammonia (NH3), Ozone (O3) and Chlorine (Cl2) must be avoided at all times, even in small quantities. Hydrogen Chloride (HCl) also attacks...

the SDHmini-L response time to an unacceptable level. In general, a flow rate of between 2 and 5 litres/min at normal temperature and pressure will give the right balance. The SDHmini-L is designed to operate at atmospheric pressure with a maximum of 0.3 bar. 3.3 Piping Installation Schematic MAIN PROCESS LINE Notes a. The sample point should be on the upper surface of the horizontal pipe or from a vertical section of pipe, wherever possible. b. The sample tube should run upwards from the sample point. If this is not possible, then an inspection port or drain tap should be installed at the lowest...

3.4 Piping Schematic Component Index 1. Sample Isolation Valve - This is a recommended item as it allows access to the sample system without interrupting the main process line. 2. Filter Unit – A filter unit is recommended when the samples are likely to contain particulate matter. If the air/gas sample contains heavy hydrocarbon condensate, the filter must be of the coalescing type with a drain. The filter unit should be positioned as close to the sample point as practical. 3. Sample Tube – This should be stainless steel for dry air or gas applications but copper or carbon steel can be used where...

Continue this for two minutes to remove any residual moisture from the sample pipe work and components. Check that no liquid or particulate contamination, which could damage the sensor, is passing through the sample pipe. Directing the sample onto a piece of white paper (such as a filter paper) will make it easier to see any dust or oil mist in the sample. Connect the SDHmini-L. The SDHmini-L is not flow sensitive, however, the sample flow needs to be enough to fill the sensor head with gas effectively, so anything less than 1 litre/min would mean that the instrument would take too long to settle...

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 wetting it. When the instrument is not in use it should be stored with the head in the down position. 3.7 Desiccant Dry-Down Technology The unique design allows purging of the gas in the “DryDown Position” which will bring all surfaces and voids to equilibrium. Sensor surrounded by desiccant ensuring it is dry, ready for the next measurement. The desiccant and sensor are always isolated from atmospheric air to ensure an accurate reading. Sensor exposed...

3.8 Sample Connections The SDHmini-L is supplied with two connections: a Fir Tree on one side and a Swagelok compression fitting for ¼”, ⅛”, 6 mm OD pipe or another Fir Tree fitting (as specified on your order) on the other. Either can be used as the inlet connection (6). PTFE and stainless steel are recommended materials for sample pipes. Some specialist flexible tubing may be suitable as sample pipe but common flexible tubing such as PVC, nylon, polythene or rubber, should not be used, as they are permeable and water vapour from the atmosphere will diffuse through them into the sample gas....