Brooks
®
Model 5860
i
3-2
Section 3 Operation
Installation and Operation Manual
X-TMF-5860i-MFM-eng
Part Number: 541B110AAG
November, 2008
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 5860
i
is factory adjusted to provide a 0 ±10mVdc or a 4 mAdc
±0.05 mA 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 20 minutes for the temperature of the meter and its
environment to stabilize. Using a suitable voltmeter check the meter output
signal. If it differs from the factory setting adjust it by removing the lower
pot hole plug, which is located closest to the meter body. Adjust the zero
Figure 3-1 Flow Sensor Operational Diagram
