Model ESM-40S (MTI.EWS.ER.M-ESM-40S settlement monitoring system consists of:
• Two or more model ESM-40S/1 high precision low range settlement sensors with quick connect couplings for fluid and air vent tubes. A ‘T’ connector is provided at the bottom for inter-connecting signal cables. A wall mounting fixing plate is provided.
• ESM-40S/2 Reference reservoir with wall mounting accessories.
• ESM-40S/3 Desiccant unit with wall mounting accessories
• ESM-40S/4 Fluid tube 8 mm o.d; air vent tube 8 mm o.d
• ESM-40S/5 Pressure gage and valve assembly.
• ESM-40S/6 Pressure vessel + air pump + accessories
• De-aerated fluid (50% water + 50% Ethylene Glycol) - 20 L
• Bus signal cable
• ESDL-30 SDI-12 Datalogger (Modbus card optionally available)
The settlement sensors are interconnected with an air vent tube terminated in a desiccant unit with a moisture trap. The common vent line being open to atmosphere results in settlement reading not being affected by local air current and changes in atmospheric pressure. To properly fill in the de-aerated fluid in the system, it is recommended to procure the pressure vessel and air pump along with accessories.