Oval EX DELTA II, Инструкция по эксплуатации

Страница: 24 / 50

D-583-2N-E
24
GAIN DOWN
GAIN UP
AMP Potentionmeter
AMPLIFIER BOARD
ＡＭＰ
Potentiometer
ＴＬＶ Potentiometer
Flow sensitivity is accurately adjusted over the
specified flow range before the meter leaves the
factory.
If no output appears at the minimum flowrate
p re s u m a b l y d u e t o y o u r s p e c i f i c o p e r a t i n g
conditions (disturbance from external interference,
for example), readjust the sensitivity (trigger level).
The same sensitivity readjustment is also required
in cases where the receiving instrument registers
erratic counts at meter shutoff due to noises caused
by pipeline oscillation, etc. after sensor replacement.
9.1 Amplifier Gain
Amplifier gain (amplification) is adjusted to the
sensor used. Do not attempt to readjust it except
when the sensor has been replaced.
Amplifier gain is adjustable with AMP potentiometer
on the amplifier board A. Monitor the vortex waveform
following amplification on the oscilloscope and
adjust such that the peak value of vortex waveform is
100mV p-p approx. at the minimum flowrate.
Sensitivity Potentiometer Vortex Waveform After Amplification
Amplifier Board A: AMP Amplifier Board A: VTX (+) - 0V (-)
9. FLOW SENSITIVITY AJUSTMENT PROCEDURE
Fig. 9.2
Fig. 9.