Blue Sea 1839 M2 OLED Tank Level Monitor

Description

The Blue Sea Systems 1839 M2 OLED Tank Monitor tracks up to four tanks from a single face, at 1 percent resolution, and includes auto calibration for unusual tank shapes. It weighs about 4 ounces.

Auto calibration is the feature worth paying for. Production boats rarely have rectangular tanks; they are moulded to fit the hull, so a sender reading half travel does not mean half volume. The M2 learns the actual shape so the number on the display corresponds to gallons you can use rather than a percentage of stick travel. It works with common sending units, so existing senders usually stay put.

Like the rest of the M2 range it carries an isolated 500mA MOSFET external circuit relay, which can switch an external circuit based on any value the meter reads. That allows a transfer pump or a warning lamp to be triggered by tank level directly. The alarm is 80 dB, the display auto-dims, the face is 55 by 28 mm, and input voltage is 7 to 70V DC with consumption from 0.3 to 1.0 watt. Explore our full range of marine electrical meters.