Brannstrom BilgMon 488 Calibration Kit

When to perform a BilgMon 488 calibration check

The maintenance schedule for the BilgMon 488 must address two items: the Sensor Unit’s calibration certificate, which expires after 5 years, and a calibration check on a regular basis.

Calibration check: the check may be performed occasionally onboard, at shorter intervals than the validity period of the calibration certificate. It is done with the Calibration Check Kit, see how to perform the calibration check.

If the calibration check fails: thoroughly clean the sensor and go through your installation to check that no air bubbles or particles are measured. If the fault remains, there is a high chance that the measuring cell must be replaced.

When the calibration certificate expires: the Sensor Unit must be replaced. The crew can do this onboard within five minutes, without modifications of the Master Unit, and all new sensor units are accompanied by a new calibration certificate.

See the BilgMon 488 Black Sensor Unit.

How to perform the calibration check with the Calibration Check Kit

To perform the calibration check of your BilgMon 488, follow these steps:

1. Enter the “Check 40NTU cal” submenu of the cleaning & test menu.
   
   
2. Press Enter to start the calibration test (the clean water valve will not open).
3. Close the clean water supply.
   
   
4. Drain the sensor and fill it with 40 NTU calibration fluid.
   
   
5. The display must show a value between 80% and 100%. If it does, “OK” is shown above the RETURN button.
   
   
6. Press the RETURN button to set the “Cal checked” date, shown in the “Sensor info” submenu.

What the Calibration Check Kit contains

• Cleaning brush
• Syringe
• Bottle 500 ml with lid
• Bottle 50 ml, calibration check liquid
• Cleaning cap
• Instructions

Product code: BM201001A-4

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The Calibration Check Kit in the 15 ppm bilge alarm system

The Calibration Check Kit is used with the BilgMon 488, a 15 ppm bilge alarm type approved according to IMO MEPC.107(49). The alarm monitors the oil content of the separated/filtered water and stops the discharge into the sea if the oil content exceeds 15 ppm. The Sensor Unit measures the oil content in the sample stream and holds the calibration data, and the Master Unit processes the signal and triggers the alarms. For the complete system description and the MARPOL and Port State Control requirements, see the complete BilgMon 488 page.

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