Setup Ig - Instrutech The Hornet IGM402 User Manual

Instruction Manual

SETUP IG

5.8.3
- DEGAS TIME [Factory default = 2]
The length of time in minutes that degassing will operate after it is initiated. Degas cycle can be selected
from 2 to 10 minutes.
- SENSITIVITY [Factory default = Actual Sensor Sensitivity (nominal = 8 to 15 Torr
The actual sensitivity value of each ion gauge sensor is marked on the end plate below the electronic
enclosure. The sensitivity value is designated with the letter "S" and it is a number that normally ranges
between 8 and 15. The actual sensitivity value of the ion gauge sensor is programmed in the electronics at
the factory prior to shipment. This value is also user adjustable between 2 to 99. Ion gauge pressure
readings are calibrated for nitrogen. If you use a different gas species or mixture of gases other than
nitrogen, you will be required to either make manual corrections to the pressure readout or compensate the
reading. The sensitivity adjustment function of the IGM402 you are using to measure the pressure of a gas
other than nitrogen/air may be set to compensate the reading. Compensating the pressure reading using
the sensitivity adjustment method may not be possible for certain gases if the sensitivity correction factor
results in a calculated sensitivity outside the adjustment range. User assumes all risks if sensitivity is set to
a value different than the actual sensor Sensitivity.
- FILAMENT NUM [Factory default = FILAMENT 1]
Allows user to select which filament to operate: Filament 1 or Filament 2
Note - When using yttria coated filaments, it is highly recommended to periodically alternate operating
Filaments 1 and 2. An inactive filament not operating for an extended length of time may result in that
filament failing to establish emission current when it is eventually used, especially in dirty applications.
I
- RLY LO TRP [Factory default = 1.00E-06 TORR] TRP is the menu abbreviation for TRP or SETPOINT
The relay is energized when pressure measured by IG reaches this setpoint.
If RLY I LO TRP is programmed to a lower value than RLY I HI TRP, relay will energize when pressure drops
below the RLY I LO TRP setting. Relay will then de-energize when pressure rises above RLY I HI TRP.
If RLY I LO TRP is programmed to a higher value than RLY I HI TRP, relay will energize when pressure rises
above the RLY I LO TRP setting. Relay will then de-energize when pressure drops below RLY I HI TRP.
The range of adjustment for setpoint pressure is 1.00E-11 to 3.00E-02 Torr. Setting the setpoint pressure
below 1.00E-09 Torr may not be useful since the device has a low end measurement capability of 1.00E-09
Torr.
Note - If you have an older version of IGM402 with firmware number 1769-107 or lower (See INFO submenu
in SERVICE MENU screen) the RLY I LO TRP setpoint corresponds to the turn on point for the relay. The relay
will turn on when the pressure drops below this setting. With this older version of the firmware you will not
be able to set the RLY I LO TRP value higher than the RLY I HI TRP. If you try to set the RLY I LO TRP to a
value higher than RLY I HI TRP, the IGM402 will revert back to the original RLY I LO TRP value. To do this
correctly so that the IGM402 will accept the new setting for the RLY I LO TRP, you must first select the
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IGM402 Hornet
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