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KJLC® 351 Series Hot Cathode Bayard-Alpert Miniature-Ionization Vacuum Gauge

Product Datasheet For a downloadable datasheet on this product,
please click here.

When used with KJLC's multigauge controllers, the KJLC351 ionization vacuum gauge module provides the basic signal conditioning required to turn the gauge into a complete measuring instrument.

KJLC continuously strives to enhance the design, reduce cost and improve the performance and reliability of the KJLC351. The electrometer circuit auto zeroes to ensure that the readings are not subject to temperature drift, eliminating the need for unnecessary, expensive circuitry which further reduces the cost.

All operations including filament on/off, degas, and change of emission current is controlled from the MGC.

The emission current can be set to automatically switch between 4 mA and 100 µA. This results in optimal and stabile pressure readings over the KJLC351's measurement range, 1.0 x 10-9 to 5 x 10-2 Torr

The KJLC351 gauge tube assembly is constructed of a compact all metal design with dual yttria coated Iridium or optional dual tungsten filaments.

For general vacuum applications, dual yttria coated filaments are offered for use with air and inert gases such as N2, argon, etc. Dual tungsten filaments are available for use with gases that may not be compatible with yttria coated filaments.

The gauge sensor assembly can be easily replaced in the field.

  • Wide measurement range
    1.0 x 10-9 to 5 x 10-2 Torr
    1.3 x 10-9 to 6.7 x 10-2 mbar
    1.3 x 10-7 to 6.7 Pa
  • Ionization gauge designed specifically for use with KJLC's Multi-gauge Controller (MGC)
  • Significant cost savings compared to other vacuum gauge measurement systems
  • Full range measurement from 1 x 10-9 Torr to atmosphere when used with the KJLC Multi-gauge Controller (MGC) and a convection gauge
  • Dual hot filament design, rugged and compact metal construction
  • Built-in Electrometer results in significant controller and cabling cost reduction
  • Interconnect cable sold separately.

Specifications Table

Measurement Range 1.0 x 10-9 to 5 x 10-2 Torr /
1.3 x 10-9 to 6.7 x 10-2 mbar /
1.3 x 10-7 to 6.7 Pa
Accuracy - N2 (Typical)1.0 x 10-8 to 5 x 10-2 Torr; ±15% of reading
Repeatability - (Typical)±5% of reading
Materials Exposed To Gases Dual Filaments: yttria coated iridium or optional tungsten
Ion collector: tungsten
Grid: tantalum
Others: 316/304 SS, glass, nickel
SensitivityFactory pre-set. Also user adjustable from 2 to 99 (set by the KJLC Multi-gauge Controller (MGC))
X-Ray Limit< 5 x 10-10 Torr, < 6.7 x 10-10 mbar, < 6.7 x 10-8 Pa
Emission Current100 µA, 4 mA, or automatic switching between 100 µA and 4 mA
Degas3 W, electron bombardment
Overpressure Protection Gauge is auto turned off at factory default setting of 5 x 10-2 Torr
The MGC can also be set up to auto filament turn on/off using a convection gauge
Filament StatusFilament on/off status is determined by LED on the KJLC351 and also displays messages and available user interface options on the MGC
Internal Gauge Volume1.0 in3 (16.4 cm3)
TemperatureOperating: 0 to + 40°C; Storage: -40 to + 70°C
Bakeout Temperature200°C (sensor only - electronics removed)
Humidity0 to 95% relative humidity, non-condensing
Weight0.6 lb. (0.27 kg) with NW25 KF flange
Housing (Electronics)Aluminum extrusion
Mounting OrientationAny
Setpoint RelayRelays available from MGC
Input SignalAll KJLC351 operations controlled from the MGC
Filament SelectionUser selectable between filament 1 and 2 - command signal sent from the MGC
Input PowerPowered by MGC
Connector/CablingKJLC cable/connector assembly for connection to MGC
Compliance & StandardsCE compliant, RoHS compliant

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Ordering Table

Supplementary Parts  = Click icon below to view Supplementary Parts.

Description Termination Manual PartNo Price Add
Item
VacuCADSM
Description Termination Manual PartNo Price Add
Item
VacuCADSM
Supplementary Parts KJLC 351 Series Ion Gauge
NW16KF
Download PDF
KJLC351400YB
P.O.R.
N/A
Supplementary Parts KJLC 351 Series Ion Gauge
NW25KF
Download PDF
KJLC351400YC
P.O.R.
N/A
Supplementary Parts KJLC 351 Series Ion Gauge
NW40KF
Download PDF
KJLC351400YD
P.O.R.
N/A
Supplementary Parts KJLC 351 Series Ion Gauge
1 1/3" Mini-CF
Download PDF
KJLC351400YE
P.O.R.
N/A
Supplementary Parts KJLC 351 Series Ion Gauge
2 3/4" CF
Download PDF
KJLC351400YF
P.O.R.
N/A

Accessories Table

Accessory
Type
Description PartNo Price Add
Item
Accessory
Type
Description PartNo Price Add
Item
Interconnect Cable
351 to MGC4000, 10ft. (3m)
BXC400-1-10F
P.O.R.
Interconnect Cable
351 to MGC4000, 25ft. (8m)
BXC400-1-25F
P.O.R.
Interconnect Cable
351 to MGC4000, 50ft. (15m)
BXC400-1-50F
P.O.R.
KJLC 351 Replacement Sensor
NW16KF
IG4YB
$246.00
KJLC 351 Replacement Sensor
NW25KF
IG4YC
$268.00
KJLC 351 Replacement Sensor
NW40KF
IG4YD
$280.00
KJLC 351 Replacement Sensor
1 1/3" Mini-CF
IG4YE
$280.00
KJLC 351 Replacement Sensor
2 3/4" CF
IG4YF
$291.00

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