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Ecotech Digital Flow Calibrator AAS 127C has been designed for intermediate
checking of flow rates for the range of 0 -30 lpm.
Calibrator can be used in lab or in field
Dry and filtered air need to be sucked in the system using a non pulsating pump
of suitable capacity which can generate adequate suction for desired flow (upto
30 lpm)
Environmental condition such as Temperature, Relative Humidity and Barometric
pressure need to be recorded at place and time of calibration
Device under calibration need to be connected at inlet of the calibrator suction
end marked with IN. There are two tubes with PU fitting upper tube is connected
to upper low flow unit having flow range 0-5 lpm. while lower PU fitting tube
connected to High flow unit having flow range higher flow rates 5-30lpm.
Connection of suction pump need to be made at OUT mark two PU ports are existing
upper tube is low flow rate 0-5 lpm while lower part is for 5-30 lpm.
Ensure that valve is at fully close position. Pump need not to be started unless
and until flow indicator is switch on and show zero reading.
Warm up time of 15 minute is required to get stable precise reading. Input
voltage 220V AC must not have variation more than ± 2V is required for
electronic unit . A CVT need to be used to give supply of power to AAS 127C.
Separate stabilized power to pump may be necessary ensure input voltage to pump
220 ± 10V AC for satisfactory stable suction.
Once power is connected to calibrator use wo way switch provided on front panel
of the calibrator. Two way switch controls power to flow indicators and one can
switch on and switch off it one by one. Upper indicator is for 0-5 lpm and lower
indicator is for 5- 30 lpm switched on indicator will display 0.00 lpm while
other indicator will remain in off position
Leave indicator switched on for at least 15 min for warming up meanwhile connect
unit under calibration to selected flow indicator. As explained in earlier
sections.
Pump can be switched on and open control valve gradually to achieve the suction
desired carefully. Once desired flow is achieved leave entire system for at
least 1 minute to stabilize the flow in DUC and in flow calibrator at set
position
Record environmental condition Temp. RH and Barometric Pressure.
At inlet of DUC ensure putting a filter so that particulates do not enter in the
calibration system
Record flow indicator reading against set flow in DUC record 5 readings at each
calibration point.
For 0 -5 lpm following calibration points can be selected 0.5, 1.0, 3.0 and 4.5
lpm
Once calibration 0-5 lpm range is over switch off pump and close the valve. Now
with the help of two way on off switch select high flow indicator. Switch on
pump open valve to achieve desired flow in DUC leave system in operation for one
minute and than record reading of DUC, Flow calibrator at set calibration point.
Five reading need to be taken at each calibration point.
For high flow range 5 -30 lpm following calibration points can be selected
6,9,14,20,25 and 30 lpm
Calculate error in flow rate indicated by DUC in reference to the True Flow rate
displayed by flow calibrator. Sample blank data sheet is enclosed for making
observations
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