Measure the alkaline reserve in engine oils is important to maintain the ability of the lubricant to neutralize acids resulting from combustion.

To avoid acid corrosion inside a combustion engine it is essential to maintain a certain alkalinity reserve. Additives (mostly calcium) are added to the oil to neutralize any acid which might build up during the combustion process.

Normally the BN of an engine lube oil decreases with the running hours. In two stroke engines the circulation oil gets contaminated with leaking cylinder oil which has a much higher BN. This leads to a steep increase of the BN value of the engine system oil.

The CMT BN Test Kit provides state of the art analysis and gives fast, accurate results within a couple of minutes.

The Standard BN Test Kit has been developed for all standard applications like testing the system oil used in all kinds of diesel engines and the CDO BN Test Kit has been specially developed to test the scraped down cylinder drain oil in two stroke crosshead engines.

The CDO BN Test Kit software has been developed specifically to give reliable results despite the fact that used drain oil may have droped down to only 10% BN reserve left compared to the fresh oil.

The CMT BoB BN Test Kit allows to test the base number of cylinder oils blended on board. It will report the BN of the blend as well as the mixing ratio. Furthermore the BOB BN Cell allows to test the remaining BN of the drain oil and the remaining BN of the system oil. For easier handling it allows to store calibration for 5 different system oils and 3 different cylinder oils for drain oil testing.

Following Test Kits are avaliable:

• Standard BN - for system oil only
• CDO BN - for cylinder drain oil only
• BoB BN - for system oil, cylinder drain oil and blending

Standard BN Test Kit (for system oil)
OTK-CT-11202

• Range: 5-100 BN
• Accuracy: Typically +/- 5% of fresh oil BN
• Dimensions: Ø 68 mm x 84 mm
• Weight: 490 g
• Test Time: 2 minutes
• Memory: Previous test result
• 8 calibrations for different oils
• Reagents: non hazardous

CDO BN Test Kit (for cylinder drain oil)
OTK-CT-11214

• Range: 5-130 BN
• Accuracy: Typically +/- 5% of fresh oil BN
• Dimensions: Ø 68 mm x 84 mm
• Weight: 490 g
• Test Time: 2 minutes
• Memory: last reading
• Reagents: non hazardous

BoB BN Test Kit - (for blending, cylinder drain oil)
OTK-CT-11217

• Range: 5-400 BN
• Accuracy: Typically +/- 2% or +/- 3 of
• fresh oil BN
• Dimensions: Ø 68 mm x 84 mm
• Weight: 490 g
• Test Time: 2 minutes
• Memory: last reading
• Reagents: non hazardous

Reagent & Spares
OTR-CT-12002 - Base Number Reagent Pack (50)
OTS-CT-13002 - Spare BN TestCell
OTS-CT-13027 - Spare CDO BN TestCell
OTS-CT-13006 - Spare BOB BN TestCell
OTR-CT-11000 - Test Kit Cleaner (250 ml)
OTS-CT-13005 - Battery for TestCell
OTS-CT-13004 - Set of O-Rings for TestCell