Model SADPmini2 Dewpoint Hygrometer 2301 SADPmini2 User Manual

Contact Information Head Office Alpha Moisture Systems Alpha House 96 City Road Bradford West Yorkshire BD8 8ES United Kingdom Tel: +44 (0) 1274 733100 Email: [email protected] Website: amsystems.co.uk Office Opening Hours: Monday - Thursday 8.30am - 5.30pm (UK TIME) Friday 8.30am - 5.00pm Saturday and Sunday - Closed Authorised Distributor Contact Information © Alpha Moisture Systems 2017-2023

Introduction This User Manual is only for use with the instrument supplied. All information required for the safe and proper operational use of the instrument is contained here. Make sure you read and understand the information and instructions in the User Manual before using the instrument. Failure to operate the instrument as directed in this User Manual may: • Impair the inbuilt safety protection offered by the instrument • Expose personnel to risk of injury • Cause damage to and/or impair the function of the instrument • Invalidate the instrument warranty Explanation of Prohibition, Warning...

Instrument Description The SADPmini2 is a fully self-contained, micro-controller based, battery operated dewpoint hygrometer primarily used for mobile analysis and short term continuous monitoring. Using an ultra-high capacitance aluminium oxide sensor and a high accuracy, high speed, Analogue to Digital Converter (ADC), the SADPmini2 monitors dry industrial process gas and dry compressed air samples. Results are displayed on a colour Liquid Crystal Display. The SADPmini2 is controlled via the Navigation Keypad. The display screen has two sections: • A primary, upper section ① providing numerical,...

General Arrangement

Functional Description of Desiccant Chamber Keeping the sensor dry between tests makes sure that the SADPmini2 is ready to carry out rapid sample checks. The design of the Desiccant Head achieves this by surrounding the Aluminium Oxide Sensor with desiccant, keeping the sensor dry when not in use. A sample of the process gas or air is piped to the inlet port. The sample flows through the measuring chamber while the Desiccant Head remains in position over the Aluminium Oxide Sensor. Restricting the continuous flow of the sample by closing off the opposite port causes a pressure increase inside...

Important Information Symbols Table Symbol Description Lithium-ion Battery The SADPmini2 is powered by a single lithium-ion battery. The battery may be exchanged by an authorised agent with the necessary training, support systems and accreditation. Only use the USB power supply supplied with the instrument to charge the battery. It is recommended that the SADPmini2 be put on charge overnight prior to use Pressure Exposure The telescopic measuring head should not be exposed to more than 0.3 barg, 4 psig Exposing the measuring head to higher pressures may damage the instrument and result in injury...

Battery Information The SADPmini2 uses a single lithium-ion battery (3.65 V nominal). The battery cannot be removed or replaced by the user. The instrument must be returned to an authorised agent for battery replacement. When the battery charge is low and/ or the battery is charging, the instrument display will be dimmed. If the battery is very low and the user tries to turn the instrument on, a battery low icon will be displayed and the instrument will shut down. DO NOT Do not replace the battery. Only authorised agents should replace the battery. Do not open, crush, expose to heat above 50...

NOTE Authorised distributor details will differ locally

Installation This section details the sample specific SADPmini2 installation procedures and the instructions for obtaining the correct result from sample gas. 3.1 Gases to avoid Corrosive Gases: The Sensor should not be exposed to corrosive gases (or corrosive contaminants in the gas sample) as these can chemically attack the sensor, impairing calibration accuracy and/or damaging it beyond economic repair. Examples of such gases are mercury (Hg), ammonia (NH3), chlorine (Cl2) etc. Strong oxidising agents such as ozone (O3) should also be prevented from coming into contact with the sensor.

Gas Sampling System DO NOT Do not allow the sample pressure to exceed 0.3 bar / 4 psi above ambient NOTE To maintain sample integrity and minimise equilibration time the system should be as simple as possible and of minimum swept volume. NOTE The sample tube should be stainless steel for very dry gas applications. If any section of the pipework must be flexible, it is recommended that PTFE is used. Installation Configurations The installation configurations discussed cover the following sample scenarios: • Clean gas < 10 bar • Clean gas > 10 bar • Particulate or liquid contamination No. 1 2 3...

Clean Gas < 10 Bar Reduce positive pressure gas to atmospheric pressure. Use a needle valve at low pressures (<10 barg) to control flow and pressure drop. Clean Gas > 10 Bar Reduce positive pressure gas to atmospheric pressure. Use a stainless steel, low swept volume pressure regulator at higher pressures (>10 barg). Particulate/ Liquid Contamination Filter all particulate matter. Use a coalescing filter (with drain) for liquid condensate samples. Hygroscopic particulates and liquid condensate will slow the achievement of equilibrium and delay the final result. Hygroscopic liquid (such as glycol)...

Install the sample piping system and equipment as per the required installation configuration. NOTE: The SADPmini2 is not connected to the inlet piping system at this stage. Open the sample Isolation Valve and adjust the needle valve/ regulator to allow a flow of 5-15 litres per minute to atmosphere through to sample pipe. Allow the gas to flow through the sample pipe for 2 minutes to purge the system. After ensuring that the sample gas is clean and dry connect the sample pipe to the instrument. NOTE: The orientation of the ports is not important. When the sample flow is low or very dry gas is...