Prevac MG15 - Gauge Configuration - Sensor Menu

OPERATION MULTI GAUGE CONTROLLER
3.6.1 GAUGE CONFIGURATION - SENSOR MENU
Gauge selection menu. Select a gauge type compatible with the gauge type physically connected
with the device. The following types of passive gauges are available: IE514, IE514, UHV-24, UHV-
24p, MKS Series 274, NUDE-UHV-8A, NR-F-UHV, G8130, BARION basic II, Deined and active:
CTR90, TTR91, TTR211, PTR225, PKR251/360/361, PCR280, TPR280/281, PTR90, ITR90,
ITR100, Baratron, Analogue input, PG105, ATMION, IKR360/361, User Deined.
Gauges CTR90/91 and Baratron require additionally to specify the FS parameter (Full Scale) com-
patible with the connected gauge. The parameter deines the measuring range of the connected
gauge. For CTR90/91 gauges the FS parameter is expressed in Torr. For Baratron gauges the FS
parameter is expressed in Torr and PSI. The PG105 gauge requires an initial calibration procedure,
which is necessary for the correct vacuum display. This is a two-point calibration: at atmospheric
pressure and medium vacuum. Connection of the PG105 gauge requires an additional ampliier
(PGA13).
3.6.1.1 SETUP OF ACTIVE GAUGES
To obtain correct indications of vacuum choose a gauge compatible with the physically connected
one. For that purpose click on Setup menu →Sensor →IG1 or IG2 or IG3 →Gauge: current gauge
The user can select one of the standard gauges or a gauge named as Deined, which enables spec-
ifying all the parameters of a gauge, thus allowing any gauge to be connected 3.6.1.3. Also after
selecting a gauge from the list of standard gauges, the user may deine its basic parameters 3.6.1.2.
The following parameters of passive gauges are permanently monitored during operation:
• anode voltage
• ilament voltage (Ubias)
• emission current
• ilament current
• relector voltage
3.6.1.2 PARAMETERS OF PASSIVE GAUGES
1. EMISSION CURRENT
The user may set an emission current between 0.05mA - 10mA:
Pressure is calculated according to the following formula:
𝑃 =




⋅

where:
𝑃 - pressure
𝐼

- ion current, see ig. 3.40
𝑆

- sensitivity factor for a given gas g
𝐼

- emission current, see ig. 3.40
For most gauges the emission current 𝐼

must be kept at a low level for high pressures, and
for low pressure it should be accordingly increased.
Page 60 User manual rev. 03