Ametek Drexelbrook 505-1320 Series, Installation And Operating Instructions Manual

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505-1320 Series Ultrasonic Open Channel Flowmeter
TM
CAUTION
Secondary calibration procedure permanently
overwrites factory calibration.
a. Perform the standard calibration per Section 4.3 .
b. Record the Zero switch settings.
c. Measure the distance from the transducer face to the
liquid level as accurately as possible (to the nearest 0.1
inch). Set the Zero calibration switches to this mea-
sured distance. For example, if you measured 20.5
inches from the transducer face, set the Zero calibration
switches to 2-0-5.
d. Observe both LEDs flashing.
e. Push and hold the black calibration pushbutton. Place
SW8, switch position 1 to the ON (up) position.
f. Release the calibration pushbutton, both LED
indicators will come on and light steady. Wait approxi-
mately 60 seconds until they begin to flash. Flashing
LEDs now indicate the memory update is complete.
g. Push and hold the black calibration pushbutton . Place
SW8, switch 1 in the OFF (down) position.
h. Release the calibration pushbutton.
i. Return the Zero switch settings (if necessary) to the
value corresponding to the level which represents 0%
(4 mA).
j. The secondary calibration is now complete.
4.4 Secondary Calibration