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How to calibrate and check thermal mass flow meter of Make thermal instrument company inc model 60?
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Answer Posted / carl_ellis
A Thermal Instrument was flow calibrated at the factory for a certain specified medium/fluid. If their flow meters can be recalibrated in the field for fluids other than the one specified at time of manufacture, the calibration instructions are not posted on the web site.
Their web site does have a fairly long and involved calibration check for landfill gas application (methane generated in garbage dumps/landfills) under the FAQ: What is your procedure on checking the calibration of a landfill gas meter in the field? It involves on-site multiple pitot flow measurements in a traversing pattern to get a flow average, calculating m molecular weight of the gas mixture, calculating density from the ideal gas law, and then converting to velocity and finally calculating mass flow with the tube's cross sectional area. Simple, huh?
The analog output of the transmitter, the zero at 4.00mA and the span at 20.00mA, can be adjusted with a field calibration check and adjusted as necessary.
Typically, the flow rate can only be calibrated on a certified flow stand or flow cell; field calibration is not practical. Return to the factory is typical.
Carl Ellis Measure First
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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