TF1100-EH transit-time handheld flowmeter manual
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5.3 OTHER PROBLEMS AND SOLUTIONS
(1)
When the actual flow inside the pipe is not standstill, but the instrument displays 0.0000
for the flow rate, and ‘R’ displaying signal strength and the signal quality Q (value) has a
satisfactory value?
The problems are likely caused by the user who has used the ‘Set Zero’ function on this
non-standstill flowing pipe. To solve this problem, use the ‘Reset Zero’ function on menu
window M43.
(2)
The displayed flow rate is much lower or much higher than the actual flow rate in the
pipe under normal working conditions.
(a)
There is probably an offset value wrongly entered by the user in M44. Enter ‘0’ in
M44.
(b)
Problem with transducer installation.
(c)
There is a ‘Zero Point’. Try to ‘zero’ the instrument by using M42 and make sure that
the flow inside the pipe should be standstill.
(3)
The battery can’t work as long as the time period as indicated by M07
(a)
Battery should be replaced due to the end of the service life.
(b)
Newly changed battery does not fit the battery estimating software. Customizing the
battery with the software should be taken. Please contact the factory.
(c)
The battery has not been fully recharged or the recharge has been stopped too many
times halfway.
(d)
There is indeed a time difference between the actual working time and the estimated
one, especially when the terminal voltage is in the range 3.70 and 3.90 volt. Please
refer to battery voltage for a closer estimated working time.
5.4 USE MENU WINDOWS FOR TRANSDUCER MOUNTING
INSPECTION
5.4.1 Signal Strength
Signal strength (displayed in Window M90) indicates a detected strength of the signal both
from upstream and downstream directions. The relevant signal strength is indicated by
numbers from 00.0~99.9 in the TF1100. 00.0 represents no signal detected while 99.9
represents maximum signal strength.
Normally, the stronger the signal strength detected, the instrument will work more reliably, as
well as the more stable the measurement value obtained.
Adjust the transducer to the best position and check to ensure that enough sonic coupling
compound is applied adequately during installation in order to obtain the maximum signal
strength. System normally requires signal strength over 60.0, which is detected from both
upstream and downstream directions. If the signal strength detected is too low, the transducer
installation position and the transducer mounting spacing should be re-adjusted and the pipe
should be re-inspected. If necessary, change the mounting to the Z method.
5.4.2 Signal Quality (Q value)
Q value is short for Signal Quality (displayed in Window M90). It indicates the level of the
signal detected. In the TF1100, Q value is indicated by numbers from 00~99. 00 represents
the minimum signal detected while 99 represent the maximum. Normally, the transducer
position should be adjusted repeatedly and coupling compound application should be
