SDHmini-Ex Intrinsically Safe Portable Hygrometer Instruction Manual
36Pages

Model SDHmini-Ex Dewpoint Meter Instruction Manual 3001 SDHmini-Ex User Manual - Iss 4.3

1 Introduction 1.1 Unpacking Your Shaw Moisture Meters SDHmini-Ex Please examine the SDHmini-Ex 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-Ex 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...

The SDHmini-Ex 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 (safe area only) ● Downloading of new firmware to the unit ● Downloading of setup data from dedicated PC software ● Downloading logged data files and real time data from the unit Alternatively, to...

2 Important Information 2.1 Hazardous Area Use - Safety The SDHmini-Ex is certified intrinsically safe to ATEX, IECEx and UL standards: ATEX: II 1 G Ex ia IIC T4 Ga (-20°C ≤ Ta ≤ +50°C) II 1 D Ex ia IIIB T60°C T5080°C Da IECEx: Ex ia IIC T4 Ga Ex ia IIIB T60°C T5080°C Da (-20°C ≤ Ta ≤ +50°C) UL: Class I Division 1 Groups A, B, C and D T4 The equipment complies with the requirements of: IEC 60079-0:2011 and IEC 60079-11:2011 UL 913 and CSA 157 It is the responsibility of the user to ascertain the suitability of the SDHminiEx for use in hazardous areas. Risk assessments should be carried out...

It is recommended that the SDHmini-Ex be put on charge overnight when the unit is first received. To attain maximum cell life the SDHmini-Ex 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 conditions. Switch on the instrument to check if fully charged. The symbol indicates that the device contains a battery which may be charged via the USB connector. Rating of instrument is less than 1 W in operation. Charging voltage is 5 V nominal. Charging input is however additionally protected to Um 250 Vrms....

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...

the SDHmini-Ex 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-Ex 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...

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...

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-Ex. The SDHmini-Ex 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...

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...

3.8 Sample Connections The SDHmini-Ex 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...