Technology The LNTech CM-15 & CM-25 CalMasters are used to induce airflow leaks in calibrating leak detectors. The instruments use a proprietary mass flow sensor to measure the flow of air from the leak detector’s calibration port or leak test fixture. In calibration mode, the calibration port is connected to the inlet (PRESSURE) port of the CalMaster.
Air flows through a precision needle valve, across the mass flow sensor and out to atmosphere. This flow is measured and displayed on the DRO (digital read out). The leak rate is adjusted by varying the setting of the needle valve. Calibration of vacuum type leak detectors is similar, except the calibration port is connected to the CalMaster outlet (VACUUM) port, and the inlet (PRESSURE) port is left open to atmosphere. Calibration of downstream (bell jar) leak detectors - a supply pressure must be connected to the inlet(PRESSURE) port, while the outlet (VACUUM) port is connected to the calibration port on the leak fixture. This will simulate a leak flow in to the bell jar. Display 3-1/2 digit LCD display Low Battery Indicator (display on meter) Controls Flow Adjustment Zero adjust & power on-off
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