Bayard-Alpert Ionization Gauges

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Ion Gauges
Nude and glass ion gauges

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Nude gauges
Glass gauges
Nude-UHV gauges

Nude gauges
Glass gauges
Nude-UHV gauges

Nude gauges
Glass gauges
Nude-UHV gauges

SRS offers three types of gauges for the IGC100 Ion Gauge Controller: glass-tubulated, nude, and nude-UHV Bayard-Alpert ionization gauges. We also supply convection-enhanced Pirani gauges. All single, hair-pin shaped filaments used in SRS gauges are spring tensioned to eliminate filament sag. This allows the user to mount the gauge in any orientation. Dual-filament assemblies provide security against filament burnout.

SRS Ion Gauges

To select the appropriate gauge, follow the steps below using the Model Numbers / Selection & Cross-Reference Table (next page).

Select the type of gauge: glass tubulated, nude or nude-UHV (see Specifications tab)
Select filament type: ThO2/Ir or tungsten, single or dual
Note the SRS part number, and click on one of the Quick Links (Prices, Buy Online, Get a Quote) above

Once you have selected a gauge, choose the appropriate cable using the pin connector diagram below.

BA Gauge Pin Connector Configuration

Product #	Available Bayard-Alpert Ionization Gauges
GR-100F	2.75" CF, 1" side tube, single filament, ThO₂/Ir
GW-100F	2.75" CF, 1" side tube, dual filament, tungsten
NR-F	Nude, bi-filar helix grid, dual filament, ThO₂/Ir
NR-F-UHV	Nude, closed cage grid, dual filament, ThO₂/Ir
NW-F-UHV	Nude, closed cage grid, dual filament, tungsten

Bayard-Alpert Gauge Model Number/Selection and Cross-Reference Table

Type	Description			Pin Config/ SRS Cable#	SRS Part#	Granville -Phillips	ETI	Duniway Stockroom	Kurt J. Lesker	Varian
Glass Tubulated	Connection		Filament Material
	Type	Diameter	(count)
	Metal Tube Kovar)	0.75 in.	ThO₂/Ir (single)	Fig. 1	GR-075K*	274003	4336K	I-075-K	G075K	K2471305
	Metal Tube Kovar)	0.75 in.	tungsten dual)	Fig. 2	GW-075K*	274013	4336TK	T-075-K	G075TK	K7360304
	2.75" Conflat^® Flange	1 in. side tube	ThO₂/Ir (single)	Fig. 1	GR-100F	274008	4336F/1	I-CFF-275	G100F	K2471303
	2.75" Conflat^® Flange	1 in. side tube	tungsten (dual)	Fig. 2	GW-100F	274018	4336TF/1	T-CFF-275	G100TF	K7360307
Nude (2.75" CF flange)	Range	Anode Grid	Filament Material (count)
	Std.	Bi-filar Helix	ThO₂/Ir (single)	Fig. 3	NR-F	274028	8140	I-NUDE-BAC	G8140	L5150-302
	UHV	closed end cage	ThO₂/Ir (dual)	Fig. 4	NR-F-UHV	274023	8130	I-NUDE-F	G8130	971-5007
	UHV	closed end cage	tungsten (dual)	Fig. 4	NW-F-UHV	274022	8130T	T-NUDE-F	G8130T	971-5008

* These products are no longer available from SRS

Bayard-Alpert Ion Gauges

	Glass Tubulated	Nude	Nude-UHV
Physical Data
Connection	Side tube or 2.75" CF flange	2.75" CF flange	2.75" CF flange
Side tube diameter	0.75" or 1"	N.A	N.A
Side tube material	Pyrex or Kovar (#1)	N.A	N.A
Envelope	Nonex 7720 Glass, 2.25" dia. × 5.25" long	Nude	Nude
Mounting position	Any, vertical preferred (#2)	Any	Any
Collector	Tungsten, 0.05" diameter	Tungsten, 0.05" diameter	Tungsten, 0.05" diameter
Filament	Single ThO₂/Ir (#4) or dual tungsten	Single ThO₂/Ir (#4), replaceable	Dual ThO₂/Ir or dual tungsten, replaceable
Grid	Tungsten, bi-filar helix configuration	Tungsten, bi-filar helix configuration	Tantalum and Pt/Moly support, closed end "squirrel" cage
Overall length, max.	6.0"	4.13"	4.13"
Insertion length, max.	N.A.	3.30"	3.00"
Operating Data
Operating pressure	2 × 10^-10to 10^-3Torr	4 × 10^-10to 10^-3 Torr	2 × 10^-11to 10^-3Torr
Sensitivity for N₂ (nominal)	10/Torr	10/Torr	25/Torr
X-ray limit	2 × 10^-10Torr	4 × 10^-10Torr	2 × 10^-11 Torr
Electron bombardment degas, Power @500V	70 W (nominal), 100 W (max.)	70 W (nominal), 100 W (max.)	40 W (max.)
Resistance heated degas	6.3 to 7.5 V @ 10 A	6.3 to 7.5 V @ 10 A	N.A.
Bakeout temperature	250 °C	450 °C	450 °C
Electrical Operating Parameters (#3)
Anode grid bias voltage	180 VDC	180 VDC	180 VDC
Collector bias voltage	0 VDC	0 VDC	0 VDC
Filament bias voltage	30 VDC	30 VDC	30 VDC
Filament supply current	4 to 6 A	4 to 6 A	4 to 6 A
Filament supply voltage	3 to 5 VDC	3 to 5 VDC	3 to 5 VDC

Notes: 1. Glass-to-metal transition 2. Vertical orientation provides strain relief for electrode structures increasing long-term stability 3. Direct current (DC) bias and supply voltages are recommended for all electrical connections. 4. Single filaments are hair-pin shaped and spring loaded to eliminate sagging.