Operation and Calibration of LIQUID FLOW METER

PURPOSE :
           To provide a procedure to operate and maintain the Agilent make LIQUID FLOW METER , Opti flow 1000.
 II.    SCOPE :
        This procedure is applicable for the Agilent make liquid flowmeter , Opti flow 1000 the Quality Control department. 

III.    RESPONSIBILITY :
        It is the responsibility of all the personnel using the liquid flowmeter.
IV.    DOCUMENT REFERENCE :
        SOPs    :    Core procedure: Calibration of Equipment
        Forms    :    None
V.     OPERATION :
1.0    PRELIMINARY CHECK :

1.1    Check that the instrument  if not, clean with a soft cloth duster.

2.0     BASIC OPERATION : 
2.1     Swith on the instrument with   button.
2.2     Liquid crystal display (LCD) segment check will be displayed as follows.
            LO BAT
                        ?     1.8.8.8        
2.3    After the LCD segment has been displayed, a ‘0’ (Zero) should appear on the display indicating that the instrument is ready for use.
2.4    Connect the over flow and drain tubing to the appropriate fittings as indicated in Figure and route them to safe waste containers.
2.5    The liquid source is connected to the inlet which accepts 1/16-inche tubing.

3.1    Measurement:
3.1    Press the ‘ON/RESET’ button momentarily to turn the instrument on. 
3.2    The display will cycle through the segment check and then display a zero, indicating the instrument is ready for use.
3.3    As the rising meniscus passes the lower optical sensor, the plus sign (+) will appear in the display indicating that a measurement is in progress. It will remain on only while the meniscus between the lower and upper optical sensors. After the meniscus passes the upper sensor, the flow reading is displayed.
3.4    A reading will remain displayed until a new measuring cycle is completed, or until the unit is turned off.
3.5    To manually turn off the unit at any time during the operation, simply press and hold the ‘ON/RESET’ button until ‘OFF’ appears in the display. The flow meter will shut itself off automatically approximately 10 minutes after the flow (and readings) have been stopped.
3.6    Dependable readings occur when the meniscus is properly formed and free of foam bubbles.
3.7    Ignore the first few readings while the glass becomes purely wetted, and any initial foam is eliminated. This can also be accomplished by ‘flushing’ the glass prior to operation until fluid has flowed freely from the over flow tube.

3.8    Micro processor controlled auto ranging :
Range                Flow (ml / min)        Resolution (mL/min)
1                        1.0 – 1.999                0.001
2                        2.00 – 9.99                0.01
3                        10.0 – 30.0                0.1
4.0    Precautions :
4.1      Periodic cleaning (With the aid of Ultrasonic bath) and flushing of precision bore glass with water is recommended once in three months.
4.2    The precession bore glass is a field replaceable spare.
.    

Liquid flow meter, approximately, eliminated, purely wetted