MKS 640A/641A, Manual, Page: 23 / 88

Product Location and Requirements Chapter Two: Installation
10
Product Location and Requirements
•
Ambient operating temperature range: 0
°
to 50
°
C (32
°
to 122
°
F)
•
Power requirement:
±
15 VDC
±
5%, 200 mA maximum current
•
Storage temperature range: -20
°
to 80
°
C (-4
°
to 176
°
F)
•
Mount the 640 Series controller in an upright position if possible, although any mounting
orientation is satisfactory. Refer to Installing the Unit, page 15, for more information.
•
Install a separate positive shutoff valve if your system cannot tolerate some leakage
across the control valve in the 640 controller. The control valve is not a positive shutoff
valve so some leakage across the valve may occur.
Warning
Follow your corporate policy for handling toxic or hazardous
gases. Your corporate policy on handling these gases
supersedes the instructions in this manual. MKS assumes no
liability for the safe handling of such materials.
•
Install the 640 Series controller in a “flowing” system where gas is continually added and
evacuated. Do not use the controller in a “dead-ended” system (a system which cannot
remove excess pressure). The 640 Series controller is not designed to vent excess
pressure to the atmosphere.
•
Verify that your pressure system can withstand pressure equal to the full scale range of
the transducer. Your pressure system may be exposed to the full scale pressure since the
640 controller will control over the entire full scale range of the transducer. As a
precaution, you may choose to install a safety valve in your system to vent excess
pressure.
•
Take care not to expose the transducer to pressures above its full scale range. Pressures
exceeding 45 psia or twice the full scale pressure (whichever is greater) may damage the
transducer.