4 Operation
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Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
4.3 Pre-operational Requirements
Before operating the Mini-Convectron Module, the following procedures must be performed:
1. Install the module in accordance with the instructions given in Chapter 3, Installation.
2. Develop a logic diagram of the process control function.
3. Use Table 4-6 to record the proposed setpoint pressure and activation direction for each relay.
See Section 5.2, Process Control Relays in the DeviceNet chapter for detailed information
regarding the relay settings.
4. Draw a circuit schematic that specifies exactly how each piece of system hardware will
connect to the module relays.
5. Attach a copy of the process control circuit diagram to this manual for future reference and
troubleshooting.
6. If the module will measure the pressure of a gas other than N
2
or air, you must adjust the
setpoint relays for the process gas that will be used. See Section 4.4 through Section 4.7.
If you need application assistance, phone a Granvi
lle-Phillips application engineer at
1-303-652-4400.
4.4 Preparing for Pressure Measurement
The steps in this chapter assume:
• The 275 Mini-Convectron was properly set up and installed per the instructions in Chapter 3.
• The gas in your vacuum system is air or N
2
. If you are using other gases you must follow the
instructions in Section 4.7.
• You are reasonably familiar with the general theory of operation of thermal conductivity gauges.
It is recommended that you consult a good textbook if you are unfamiliar with vacuum technology
or if you require more information on the general theory behind operating a thermal conductivity
gauge. The following books are useful reference volumes.
• Dushman, S., Lafferty, J. M., Scientific Foundations Of Vacuum Technique, John Wiley & Sons,
Inc., Second Edition, New York, 1962.
• Redhead, P. A., et al., Ultrahigh Vacuum, Chapman and Hall, London, 1968.
• O'Hanlon, J. F., A User’s Guide To Vacuum Technology, John Wiley & Sons, New York, 1980.
Table 4-6 Proposed Relay Settings
Relay
Activation
Setpoint
Deactivation
Setpoint
Relay 1
Relay 2
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