Close

Please select your country or region to be
directed to the appropriate Lesker site.

Representative Image

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

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 zeros 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 stable 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

Product Downloads
For a download of the product datasheet, click here.
Gauge Troubleshooting Form
Let us figure out what's wrong with your gauge. Visit the Gauge Troubleshooting form.
Gauges FAQ
Click here for answers to some of the most common questions we are asked.
Contact Us
To speak with someone directly, please call +1 412 387 9200 or email international@lesker.com.
Got VacuCADSM?
VacuCAD is a free library containing thousands of 2D CAD drawings (in DXF format) and 3D Models (in STP format) for many of our standard vacuum components and chambers. Please Log in

Ordering Table

Accessories Description Termination Manual
VacuCADSM
Part Number Price In Stock Add
Item
Accessories Description Termination Manual
VacuCADSM
Part Number Price In Stock Add
Item
KJLC 351 Series Ion Gauge NW16KF
Download PDF
(please log in)
KJLC351400YB
P.O.R.
Call for Availability
KJLC 351 Series Ion Gauge NW25KF
Download PDF
(please log in)
KJLC351400YC
P.O.R.
Call for Availability
KJLC 351 Series Ion Gauge NW40KF
Download PDF
(please log in)
KJLC351400YD
P.O.R.
Call for Availability
KJLC 351 Series Ion Gauge 1 1/3" Mini-CF
Download PDF
(please log in)
KJLC351400YE
P.O.R.
Call for Availability
KJLC 351 Series Ion Gauge 2 3/4" CF
Download PDF
(please log in)
KJLC351400YF
P.O.R.
In Stock

Accessories Table

Accessory
Type
Description Part Number Price In Stock Add
Item
Accessory
Type
Description Part Number Price In Stock Add
Item
Bolts
Bolt Set
HBS25028138
$30.50
In Stock
Bolts
Bolt Set
SBS832075S4-25
P.O.R.
In Stock
Clamp
Clamp, QF16
QF16-075-C
P.O.R.
In Stock
Clamp
Clamp, QF25
QF25-100-C
P.O.R.
In Stock
Clamp
Clamp, QF40
QF40-150-C
P.O.R.
In Stock
Gasket
OFHC Copper Gasket (1/4 hard)
GA-0133
$21.05
In Stock
Gasket
OFHC Copper Gaskets for CF Flanges
GA-0275
$27.35
In Stock
Interconnect Cable
351 to MGC4000, 10ft. (3m)
BXC400-1-10F
P.O.R.
In Stock
Interconnect Cable
351 to MGC4000, 25ft. (8m)
BXC400-1-25F
P.O.R.
Call for Availability
Interconnect Cable
351 to MGC4000, 50ft. (15m)
BXC400-1-50F
P.O.R.
Call for Availability
KJLC 351 Replacement Sensor
NW16KF
IG4YB
$275.00
Call for Availability
KJLC 351 Replacement Sensor
NW25KF
IG4YC
P.O.R.
Call for Availability
KJLC 351 Replacement Sensor
NW40KF
IG4YD
$315.00
Call for Availability
KJLC 351 Replacement Sensor
1 1/3" Mini-CF
IG4YE
$315.00
Call for Availability
KJLC 351 Replacement Sensor
2 3/4" CF
IG4YF
$325.00
In Stock
Viton O-ring
Viton O-ring with centering ring, QF16
QF16-075-SRV
$6.75
In Stock
Viton O-ring
Viton O-ring with centering ring, QF25
QF25-100-SRV
$8.55
In Stock
Viton O-ring
Viton O-ring with centering ring, QF40
QF40-150-SRV
$13.10
In Stock