Series 275Analog, RS485 and DeviceNet™ ModulesThe Mini-Convectron® Module combines the high precision convection enhanced Pirani gauge with electronicsto provide a compact, convenient, reliable, and cost-saving solution for vacuum measurement from atmosphereto 10-4 Torr. With over 35 years of successful field installations, the Convectron® gauge has become an industrystandard. It is a unique variation of thermal conductivity gauges where pressure measurement is based on therate of heat loss from a sensor wire. Unlike traditional thermocouple and Pirani gauges that use only conductiveheat loss, Convectron gauges take advantage of heat loss due to convection at higher pressures. This extendsthe range of accurate, repeatable measurement to atmosphere. Modules are available with analog output,RS485 interface, and DeviceNet interface.

Product Features• Wide range pressure measurement from atmosphere to10-4 Torr (10-4 mbar, 10-2 Pa)• Individually calibrated gauges assure highest measurementperformance• Available with set point relays for safety interlocking• Optional local display aids setup and diagnostics• Digital interface versions for use with computer controlledsystems• DeviceNet digital interface facilitates easy system integrationKey Benefits• Cost-savings solution for vacuummeasurement• Compact, rugged, RF and noiseimmune module• All functions programmable throughRS485 or DeviceNet interfaces•Wide Measurement Range: Allows vacuum system 		performance to be monitored continuously from 		atmosphere to 10-4 Torr (10-4 mbar, 10-2 Pa).

• Individual Calibration: Assures the highest level of 		accuracy and gauge-to-gauge reproducibility.
• All-Metal Package: Provides a high level of immunity toRF and noise and is CE compliant.
•Programmable Process Set Points: Relay contacts 		are available on most versions to control other vacuumequipment and provide safety interlocking.

• Digital Display Version: Provides an easy-to-read, 		3-digit green LED display that automatically adjusts		between two ranges (Torr and mTorr or kPa and Pa).

Display Side (Analog shown)• Digital Interface Version: Provides RS485 or 			DeviceNet interface for easy compatibility with 			computer controlled processes.
• Low Power Requirements: System integration is easyusing standard low voltage DC power sources.
• Replaceable Gauge: Gauge can be quickly and easilyreplaced using only a screwdriver.

Parameter Adjustment Side (DeviceNet shown)Non-Linear Analog Output (1000 Torr max)Output Voltage (Vdc)87

Ne6N25Ar432100.001Analog Output0.010.1110Pressure (Torr)1001000Parameter Adjustment Side (RS485 shown)SpecificationsMeasuring Range for Air and N2 See Notes (1), (2)													1x10-4 to 1000										Torrmbar1x10-4 to 1300 See Note (2)									1x10-2 Pa to 130 kPa
Pa1x10-4 Torr, 1x10-4 mbar, 1x10-2 PaStep Size at Minimum PressureMounting PositionHorizontal preferredPower RequiredDeviceNet11 to 26 VDC, 0.5 A at 11 VDC, 2.5 W max							Analog11.5 to 26.5 VDC, 0.1 A at 11.5 VDC, 1.6 W max, 1.8 max (with display)				RS48511.5 to 26.5 VDC, 0.12 A at 11.5 VDC, 2 W max340 gm (12oz) with 1/8 NPT fittingWeightOperating Temperature0°C to 40°C ambient, non-condensing-40°C to 70°CNon-Operating TemperatureCase MaterialAluminum extrusionEnclosureAluminum 													IP20 rating		Display (optional)3-digit green LED, automatic ranging See Note (3)							ResolutionLeast significant digit on each rangeSet Point Relays0, 1 or 2											ConfigurationSingle-pole, double-throw (SPDT)								Contact Rating1 A at 30 VDC resistive, AC non-inductive							AdjustmentsValue, direction, and hysteresis through software						Range1x10-3 to 1000 Torr, 1x10-3 to 1300 mbar, 1x10-1 Pa to 130 kPa					Resolution2 significant digitsAnalog Output0.375 to 5.659 VDC for 0 to 1000 Torr of N2, non-linearRS485 Digital InterfaceRS485, 2 set point relays									Parameters AdjustableVacuum and atmosphere calibration, set points (value, direction and hysteresis)			Baud Rates300-115.2K, 19200 Baud (default value)							Data FormatASCII, 8 data bits, one stop bit, no parity, no handshake (default values)				ResolutionLeast significant digit on each range		DeviceNet Interface													Parameters AdjustableVacuum and atmosphere calibrations, set points						Device TypeVacuum/pressure gauge device								MessagingPolled I/O and explicit									Address0 to 63, selected by using the Low and High address switches					Baud Rates125K, 250K, or 500K, switch selectable							Connector5-pin MicroConnectors9 or 15-pin subminiature-D male, high density										5-pin Micro DeviceNetConvectron Gauge												Sensor MaterialsGold-plated tungsten or Platinum								Other Materials Exposed to Gas304 stainless steel, borosilicate glass, Kovar®, alumina, NiFe alloy, polyimide 			Internal Volume40 cc (2.5 cu. in)										Gauge Bakeout Temperature150°C maximum, non-operating, with electronics removedComplianceCENotes:(1)Measurements will change with different gases and mixtures. Correction curves for common gases are provided in the instruction manual.
(2)For units calibrated in mbar, the output signal continues up to the Full Scale of 1300 mbar, but the digital display does not display past 999 mbar.
(3)Convectron Gauges are not intended for use with flammable or explosive gases.Ordering InformationOrdering Code Example: 275600-0-GD-TModuleSeries 275 Module		DisplayWithout display (All interface options, 1 or 2 set points)With display (Analog, DeviceNet, 0 or 2 set points)InterfaceAnalog					RS485 (Available only with 2 set points, no display)DeviceNet (Available only with 2 set points)Vacuum ConnectionDim. H1/8 NPT pipe thread/1/2 inch tubulation2.2 (0.9)

1/4 inch 4 VCR®-type female3.0 (1.2)

Relay Set PointsNo Relay Set Points (Analog with display only)		1 Relay Set Point (Analog without display only)		2 Relay Set Points (Analog with/without display)(RS485 without display)		(DeviceNet with display)FilamentsGold-plated Tungsten				PlatinumFlange/FittingNW16KF					NW25KF					1.33 inch (NW16CF) ConFlat-type 			2.75 inch (NW35CF) ConFlat-type				NW40KF					1/8 inch NPT / 1/2 inch tubulation				1/4 inch VCR-type female					1/2 inch VCR-type femaleMeasurement UnitsTorrmbar
PaCodeConfiguration275275466001020

000120G
PGDEFGKPQRD

TMP

T1/2 inch 8 VCR -type female3.9 (1.5)

1.33 inch (NW16CF) ConFlat®-type3.8 (1.5)

Also available: Mini-Convectron, without display, 0-10 VDC Linear Analog, 1 mTorr to 1 Torr, 0 Set Points,Gold-plated Tungsten, Torr2.75 inch (NW35CF) ConFlat®-type3.8 (1.5)

Ordering Code Example: 275330-GDCodeConfigurationNW16KF3.1 (1.2)

NW25KF3.1 (1.2)

275330275330NW40KF3.7 (1.5)

ModuleSeries 275 ModuleFilamentsGGDEFGKPQR

D®

Dimensional Drawing		Note: Unless otherwise specified,dimensions are nominal values incentimeters (inches referenced).

Gold-plated TungstenFlange/FittingNW16KF			NW25KF			1.33 inch (NW16CF) ConFlat-type2.75 inch (NW35CF) ConFlat-typeNW40KF			1/8 inch NPT / 1/2 inch tubulation		1/4 inch VCR-type female		1/2 inch VCR-type femalewww.MKSINST.com+1-978-645-5500 I +1-800-227-8766MKS products provided subject to the US Export Regulations. Export, re-export, diversion or transfer contrary to US law (and local country law) is prohibited.

275 Analog_RS485_DNet_01/20©2020 MKS Instruments, Inc.
Specifications are subject to change without notice.

Granville-Phillips®, Mini-Convectron® and Convectron® are registered trademarks, and mksinst™ is a trademark of MKS Instruments, Inc. DeviceNet™ is a trademark ofOpen DeviceNet Vendor Association. Kovar® is a registered trademark of Carpenter Technology Corporation. ConFlat® is a registered trademark of Agilent Technologies.
VCR®and VCO® are registered trademarks of Swagelok Marketing Co.