Chapter 2 Installation
Series 810 Instruction Manual
IMPORTANT—Straight-run requirement (critical for nylon
flow body instruments
)
Install a section of straight pipe at least five pipe diameters in length
upstream of the transducer. DO NOT use reducers. In the case of a
flow meter, at least two pipe diameters downstream are required for
optimum performance. In the case of a flow controller, there can be
no restrictions (such as valves, tubing or pipe internal diameters,
reducers, etc.) upstream or downstream of the MFC with a
dimension that is less than the valve orifice diameter. Failure to
comply with this requirement will result in severely impaired
performance and possible oscillations in flow controllers. Refer to
Table 2-1 below for minimum restriction diameters upstream or
downstream of the flow controller.
Flow Ranges
Relative to N2
Valve Orifice Diameter
(Typical-in inches)
0-10 to 0-2000 SCCM
0.020
0-2 to 0-11 SLM
0.040
0-11 to 0-22 SLM
0.055
0-15 to 0-28 SLM
0.063
0-20 to 0-50 SLM
0.073
0-51 to 0-73 SLM
0.094
0-61 to 0-100 SLM
0.110
Table 2-1 Typical Minimum Restriction Diameters (Under Standard
Pressure Conditions of 30 PSIG Inlet and Ambient Outlet)
Installing the Transducer—Mechanical Mounting
Please refer to Appendix B for mechanical mounting instructions.
Installing the Transducer—Electrical Connections
Caution!
The transducer is not a
loop-powered device!
Do NOT apply power to
the 4-20 mA output or
input connections.
The Mass-Trak transducers require a 24VDC power supply. If you are
using the Power-Pak power supply, connect it to the 15-pin "D" connector
on the side of the transducer. If you are supplying your own power source,
it must be a regulated 24 VDC with ripple not to exceed 100 mV peak to-
peak and capable of producing at least 340 mA (8 watts).
Mass-Trak is provided with a 15-pin "D" connector located on the side of
the enclosure. The pin numbers and assignments for the Mass-Trak "D"
connector are shown in Figure 2-2. The connections for input power,
output signal and input signal (controllers only) are supplied via the "D"
connector. Additional pin assignments can be found in Appendix C.
2-4
IM-81
