3-2
Installation and Operation Manual
X-TMF-5860E-MFM-eng
Part Number: 541B106AAG
November, 2008
Brooks
®
Model 5860E
Section 3 Operation
3-2 Operating Procedure
a. Apply power to the flowmeter and allow approximately 45 minutes for
the instrument to warm-up and stabilize its temperature.
b. Turn on the gas supply.
c. Shut-off flow to the meter and observe the flowmeter's output signal.
If the output is not 0mVdc (±10mVdc), check for leaks and if none
are found, refer to the re-zeroing procedure in Section 3-3.
d. Adjust for the desired flow and assume normal operation.
3-3 Zero Adjustment
Each Model 5860E is factory adjusted to provide a 0 ±10mVdc signal at
zero flow. The adjustment is made in our calibration laboratory which is
temperature controlled to 21.1°C (70°F ±2°F). After initial installation and
warm-up in the gas system the zero flow indication may be other than the
factory setting. This is primarily caused by changes in temperature
between our calibration laboratory and the final installation. The zero flow
reading can also be affected to a small degree by changes in line pressure
and mounting attitude.
To check zero always mount the meter in its final configuration and allow a
minimum of 45 minutes for the temperature of the meter and its
environment to stabilize. Using a suitable voltmeter check the controller
output signal. If it differs from the factory setting adjust it by removing the
lower pot hole plug, which is located closest to the controller body. Adjust
the zero potentiometer (refer to Figure 3-3) until the desired output signal is
obtained.
Figure 3-1 Flow Sensor Operational Diagram
