Vacuum Pressure Measurement
T198X31
Granville-Phillips 275 Mini-Convectron Module (Observed 275803-EU)
About this part
T198X31 is an archive identifier associated with a Granville-Phillips Series 275 Mini-Convectron vacuum gauge module. The retained unit is observed as catalog configuration 275803-EU: a no-display, nonlinear-analog module with one process-control relay and a 1.33-inch (NW16CF) ConFlat flange. MKS ordering documentation does not define T198X31, so it is not presented as a manufacturer catalog number or as an exact alias for 275803-EU
Configurations vary. Verify the exact unit before choosing a replacement.
Key Facts
Specifications
| Record identifier | T198X31 |
| Manufacturer product family | Granville-Phillips Series 275 Mini-Convectron |
| Observed catalog association | 275803-EU; retain as an observed configuration rather than an exact alias |
| Module format | Without display, with one adjustable process-control setpoint relay |
| Vacuum connection | 1.33-inch (NW16CF) ConFlat flange |
| Electrical connector | 9-pin male subminiature-D |
| Measurement principle | Convection-enhanced Pirani thermal-conductivity gauge |
| Measurement range for air or nitrogen | 1 × 10^-4 to 1000 Torr; 1 × 10^-4 to 1333 mbar; 1 × 10^-2 to 1.33 × 10^5 Pa |
| Calibration gas | Factory calibrated for nitrogen; air is measured within the instrument accuracy specification |
| Sensor material | Gold-plated tungsten |
| Power requirement without display | 11.5 to 26.5 VDC; 0.1 A at 11.5 VDC; 1.6 W maximum |
| Analog signal | Nonlinear analog pressure output with 100-ohm output impedance |
| Setpoint relay | One SPDT relay; 2% of reading hysteresis for a module without a display |
| Installation orientation | Horizontal preferred |
| Operating temperature | 0 to 40°C ambient, non-condensing |
| Non-operating temperature | -40 to 70°C |
| Gauge bakeout temperature | 150°C maximum, non-operating, with electronics removed |
| Marking | CE-marked module configuration |
Documented 275803-EU Service Reference
These service details apply to catalog configuration 275803-EU. Confirm the catalog number on the physical module before ordering components.
Series 275 One-Relay Connector Pinout
MKS documents this 9-pin wiring for one-relay nonlinear-analog modules, including 275803-EU. Use it only after confirming the module catalog number.
| Pin | Function |
|---|---|
| 1 | Relay normally open |
| 2 | Relay normally closed |
| 3 | 11.5–26.5 VDC power input |
| 4 | Power ground |
| 5 | Analog output |
| 6 | Relay common |
| 7 | Relay disable |
| 8 | Signal common |
| 9 | Setpoint output |
Measurement and Safety Notes
- Pressure indication depends on gas species, gas density, and module orientation.
- For gases other than nitrogen or air, apply appropriate conversion data and adjust relay setpoints for the process gas.
- For an unlisted gas or gas mixture, establish a calibration curve using a gas-independent transfer standard such as a capacitance manometer.
- Do not use the module to measure flammable or explosive gases.
- Do not connect or disconnect electrical connectors while power is applied.
Documentation Downloads
Local PDF copiesPart Photos
5 imagesHistorical archive images for identification, labels, connectors, and condition reference, not current inventory.
Historical Listings & Prices
Historical listing data, not a current offerThe typical recorded price range is $100.00 to $100.00. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- T198X31 Brooks Granville-Phillips 275 Mini-Convectron 275803-EU