6
Getting Started
Filters
When pressure drop is not a concern, use in-line sintered filters to prevent large particulates
from entering the flow body of the controller. Suggested maximum particulate size is
50
microns
for all flow ranges.
Gas Connections
BASIS 2 series instruments do not require straight runs of pipe upstream or downstream.
Instruments are shipped with plastic plugs seated in the processing ports. To decrease the
chance of contaminating the flow stream, do not remove these plugs until you are ready to
install the instrument.
After removing the plugs, immediately connect the instrument to upstream and downstream
plumbing, leak-tight. Verify that the flow matches the direction indicated on the instrument
body. Standard gas flow instruments have female inlet and outlet ports.
Connection options include:
Model
NPT
SAE
100
SCCM
–2
SLPM
1/8"
SAE4
5 SLPM
–20
SLPM
3/8"
SAE6
If you are using a fitting that does not have a face seal, use thread-sealing Teflon tape to
prevent leakage around the port threads, but
do not wrap
the first two threads entering
the instrument. This will minimize the possibility of tape entering the flow stream and
clogging the flow path.
Face seal fittings can be installed without Teflon tape applied to the threads.
∆
Caution:
Pipe dopes or sealants are not recommended on the process connections.
These compounds can cause permanent damage to the instrument should they get into
the flow stream.
Maximum Pressure
The maximum common mode pressure for BASIS 2 instruments is
145 PSIG
.
!
Warning:
Using the flow instrument above the maximum specified pressure may
permanently damage the device. If the line pressure is above these limits, use a pressure
regulator upstream of the instrument to reduce the pressure.
Power and Signal Connections
Power is supplied to the instrument through the 6-pin JST-GH connector on the top of
the instrument. The table below indicates how to connect the instrument to power and
communication.
The instrument power requirement for BASIS 2 controllers is 12–24 VDC, 210 mA. The power
requirement for BASIS 2 meters is 12–24 VDC, 12 mA.
!
Warning:
Only connect power to pin 4. Do not enable power to the instrument until all
necessary pins have been properly connected.
A mass flow instrument with
female NPT connections.
