O-Rings

O-rings for D.O. Sensors

Internal O-rings for 19 mm and 25 mm D.O. Sensors

O-rings need to be replaced over time. Internal o-rings for 19 mm and 25 mm D.O. sensors are included with each membrane kit. However, bulk packs are also available.

Internal O-rings for 12 mm D.O. Sensors

O-rings should be on hand when changing the membrane cartridge of a D.O. sensor. These internal o-rings are included in membrane cartridge kits.

However, membrane cartridge bulk packs do not include o-rings or electrolyte solution.

19 mm External O-rings

This silicone o-ring will fit the external groove of any 19 mm D.O. sensor or housing. It should be replaced regularly to ensure that the housing or sensor fits securely into the port.

Standard 25 mm External O-rings

The external silicone o-ring on a 25 mm D.O. sensor is the same as the one found on a 25 mm housing. It should be replaced regularly to ensure that the sensor fits securely into the port

25 mm Sartorius External O-rings

The Sartorius D.O. sensors and housings have an EPDM o-ring seal.

The internal diameter is slightly larger and the cross-section is slightly smaller than the external silicone o-rings found on other Broadley-James 25 mm housings and D.O. sensors.

O-rings for D.O. Sensors and pH Electrodes

External O-rings for 12 mm D.O. Sensors and FermProbe^® pH Electrodes

The Viton o-ring and Teflon washer found on 12 mm D.O. sensors is the same as those found on FermProbes with metric threads. These seals should last the lifetime of the sensor or electrode, but replacements can be purchased in sets of three.

O-rings for FermProbe Connectors

In order to keep moisture out of the connector during autoclaving, FermProbes have a small o-ring gasket at the base of the connector.

These o-rings should last the lifetime of the electrode. However, they may need to be replaced on occasion due to loss during handling.

O-rings for 25mm Housings

Standard 25 mm Housing O-rings

Broadley-James Models 320, 330, 370 housings use the same set of o-rings. O-rings should be inspected regularly and replaced at the first sign of wear.

Sartorius Housing O-rings

The external EPDM o-ring on the Sartorius housings, Models 322, 326 and 336, has a slightly smaller cross-section than those found on other Broadley-James housings.

The internal silicone o-ring is the same on all Broadley-James housings. Regular inspection and replacement is recommended. Do not use grease on any housing o-ring.

Oversized 25 mm O-rings

Broadley-James also offers a thicker, more pliable o-ring for certain applications. It has a larger o.d. but is more compressible than other silicone o-rings. It can be used on any standard 25 mm housing or D.O. sensor. This unique o-ring was designed to compensate for port imperfections such as a port that is out-of-round or has an i.d. slightly greater than 25 mm.

Please see part numbers in the information table to order:

Part Image	Part Number	Size	Material	Int./Ext.	Typically used in	Quantity
	AG-SF25-10 (10-pack)	Oversized	Silicone (50 Durometer FDA Approved)	External (designed to compensate for port imperfections, it has a larger o.d. and is more compressible than other silicone o-rings)	25 mm DO Sensors 25 mm pH Housings	10
	AG-SR15-50 (50-pack) AG-SR15-25 (25-pack) AG-SR15-10 (10-pack)	-R15	Silicone	External (replace regularly to ensure the housing or sensor fits securely into the port)	25 mm DO Sensors 25 mm pH Housings	50, 25, 10
	AG-E117-50 (50-pack) AG-E117-25 (25-pack) AG-E117-04 (4-pack)	-117	EPDM	External (i.d. is slightly larger and cross-section is slightly smaller than silicone o-rings found on our other 25 mm D.O. sensors pH housings)	25 mm B. Braun Biotech DO Sensors 25 mm B. Braun Biotech pH Housings (326, 336)	50, 25, 4
	AG-S016-50 (50-pack) AG-S016-25 (25-pack) AG-S016-10 (10-pack)	-016	Silicone	External (replace regularly to ensure the housing or sensor fits securely into the port)	19 mm DO Sensors 19 mm pH Housings (fits the external groove)	50, 25, 10
	AG-9206-10 (10 sets)	-015	Silicone	Internal	19 mm and 25 mm DO Sensors	10 (1 per set)
	AG-9206-10 (10 sets)	-014	Silicone	Internal	19 mm and 25 mm DO Sensors	20 (2 per set)
	AG-E014-10 (10-pack)	-014	EPDM	Internal	12 mm, 19 mm and 25 mm DO Sensors	10
	AG-9206-10 (10 sets)	14 x 1.0 (metric)	Silicone	Internal	19 mm and 25 mm DO Sensors	10 (1 per set) (See also: KA2501 and KA2504 cartridge kits)
	AG-S111-50 (50-pack) AG-S111-25 (25-pack) AG-S111-10 (10-pack)	-111	Silicone	Internal	25 mm pH Housings (320, 330,370) 25 mm B. Braun Biotech pH Housings (326, 336)	50, 25, 10
	300-P102 (3 sets) 300-P101 (3 sets)	-111	Viton	External (seals should last the lifetime of the sensor)	12 mm DO Sensors 12 mm pH Electrodes (F-615, F-635, F-695)	3 (1 per set)
	AG-S013-25 (25-pack) AG-S013-04 (4-pack)	-013	Silicone	External (fits at the base of the connector to keep moisture out during autoclaving)	12 mm pH Electrodes	25, 4
	AM-9316 (1-pack)	10.4 x 1.0 mm	EPDM	Internal	12 mm DO Sensors (fits the connector)	1
	AG-E011-25 (25-pack)	-011	EPDM	Internal	12 mm DO Sensors (o-rings should be on hand when changing the membrane cartridge)	25 (See also: KA1201 and KA1204 cartridge kits)
	300-P101 (3 sets)	–	Flat Teflon Washer	External (seals should last the lifetime of the sensor)	12 mm pH Electrodes (F-615)	3 (1 per set)
	300-P102 (3 sets)	–	Bevelled Teflon Washer	External (seals should last the lifetime of the sensor)	12 mm DO Sensors 12 mm pH Electrodes (F-635, F-695)	3 (1 per set)
	AG-9206-10 (10 sets)	–	Conical Silicone Gasket	Internal	19 mm and 25 mm DO Sensors	10 (1 per set)