Instruction manual

STP-200/300/400 Series Instruction Manual
3.3.5 Connecting the Ground Cable
Connect the ground cable (yellow/green) between the ground terminal of the STP
pump and the ground terminal of the STP control unit.
When the resistance between the ground terminals is lower than 0.1 Ω, it is not
necessary to connect the ground cable after installing the STP pump and the STP
control unit.
◇ When the resistance between the ground terminals is over 0.1 Ω,
always connect the ground cable.
3.3.6 Connecting the Purge Port
(For the chemical specific pump type C)
When pumping reactive or corrosive gases, introduce a dry N
2
gas or other gas
into the STP pump in order to protect the inside of the STP pump.
As shown in Figure 3.8, introduce a dry N
2
gas through the electromagnetic vent.
valve, needle valve or similar valve (must be prepared by the customer) from the
purge port.
For instructions on how to introduce the purge gas, see Section 7.3, "Gas
Suction."
◇ The proper amount of gas purge is approx. 1.7×10
-2
Pa·m
3
/sec.
(10 SCCM).
◇ The allowable gas pressure ranges from zero (atmospheric pressure)
to 0.5 kgf/cm
2
(gauge pressure).
◇ When not introducing the purge gas, close the purge port with the
blank flange (attached at delivery).
Purge Port
Dry N
２
Gas or Other
KF10
Figure 3.8 Connecting the Purge Port
3-15