Setup Ig - Instrutech Hornet User Manual

Instruction Manual

5.8.3 SETUP IG

- DEGAS TIME [Factory default = 2]
The length of time in minutes degassing will run after it is initiated. Degas cycle can be selected from 2 to 10
minutes.
- SENSITIVITY [Factory default = Actual Sensor sensitivity (nominal = 8-15)]
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. The sensitivity value may be adjusted by the user from 2 to 99. Ion gauge
pressure readings are calibrated for nitrogen. If you use a different species of gas or mixture of gases other
than the 16 gases listed under the GAS TYPE submenu of the SETUP UNIT menu, you will be required to
either make manual corrections to the pressure readout or compensate the reading. The sensitivity
adjustment function of the IGM401 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]
The relay is energized when pressure 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 IGM401 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 IGM401 will revert back to the original RLY I LO TRP value. To do this
correctly so that the IGM401 will accept the new setting for the RLY I LO TRP, you must first select the
InstruTech, Inc.
IGM401 Hornet
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