Instrutech The Hornet IGM402 User Manual page 36

Instruction Manual
RLY I HI TRP listed below and increase that value to a number higher than the value of RLY I LO TRP you are
trying to set.
I
- RLY HI TRP [Factory default = 5.00E-06 TORR]
The relay is de-energized when pressure measured by IG reaches this setpoint.
If RLY I HI TRP is programmed to a higher value than RLY I LO TRP, relay will de-energize when pressure rises
above the RLY I HI TRP setting. Relay will energize when pressure drops below RLY I LO TRP.
If RLY I HI TRP is programmed to a lower value than RLY I LO TRP, relay will de-energize when pressure
drops below RLY I HI TRP setting. Relay will then energize when pressure rises above RLY I LO 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 HI TRP setpoint corresponds to the turn off point for the relay. The relay
will turn off when the pressure rises above this setting. With this older version of the firmware you will not
be able to set the RLY I HI TRP value lower than the RLY I LO TRP. If you try to set the RLY I HI TRP to a value
lower than RLY I LO TRP, the IGM402 will revert back to the original RLY I HI TRP value. To do this correctly
so that the IGM402 will accept the new setting for the RLY I HI TRP, you must first select the RLY I LO TRP
listed above and decrease that value to a number lower than the value of RLY I HI TRP you are trying to set.
- RELAY I TEST [Factory default = OFF]
This allows the user to manually toggle the relay on and off to test for correct external circuit wiring and
ensure polarity is as desired.
- ANALOG MODE [Factory default = IG ONLY]
This sets the analog output proportional to pressure measured from the ionization gauge or IG + CG1 for full
range vacuum measurements.
Select analog output type as IG ONLY to set the analog output proportional to pressure measured from the
ion gauge only (log-linear 0 to 9 Vdc, 1 V/decade).
Select analog output type as IG + CG1 to set the analog output proportional to pressure if you intend to
combine the measurements from the ion gauge and the CG1 convection gauge for full range vacuum
measurements (log-linear 0.5 to 7 Vdc, 0.5 V/decade).
- FIL USAGE [Factory default = all at zero]
This allows the user to view how many hours each filament has been turned on and how many hours
degassing has been applied to each filament. The display in this screen provides the following data:
F1: # H (Number of hours filament 1 has been in use).
F2: # H (Number of hours filament 2 has been in use).
D1: # H (Number of hours filament 1 has been degassed).
D2: # H (Number of hours filament 2 has been degassed).
InstruTech
IGM402 Hornet
Page 34