ELM-Series Battery Electrolyte Level Monitor

The electrolyte level monitor uses a high sensitivity temperature IC mounted in the case.

Infrared.

Each ELM kit includes (1) roll of cleaning towels and (1) can of CRC PF Precision Cleaner. It is essential to clean the cells with the included cleaning kit to prevent the sensors from falling off the cells. One cleaning towel should be used to clean no more than (4) cells and one can of cleaning spray is good for up to 240 cells.

The ELM does not include an audible alarm but it is possible to use an external one. The contacts on the warning outputs are completely isolated from each other and the sensor circuits, therefor you can drive any circuit with them, lights, audible alarms, motors, pumps etc. The contacts are rated at 15 amps for 125 VAC or 10 amps at 277 VAC. There is a rating of 2KV between the contacts and coil (the coil is connected to the sensor circuits).

An electrolyte level alarm occurs if low level electrolyte is detected for more than 40 minutes (to prevent spontaneous alarming). When a level alarm is active, it will remain so until the electrolyte level is restored and the R/S button is manually pressed on the sensor. The temperature alarm occurs as soon as the threshold temperature is detected, it will reset automatically after 4 minutes.

The electrolyte level sensor must be mounted vertically in the upright position. It must be flat on the surface of the jar with the “level” line on the sensor in line with the “minimum” line on the jar.

The clearances are based on distance above and below the “minimum” line on the battery jar. The sensor frame can be removed to decrease the required clearances. Minimum height without frame: 29 mm (1 1/8th”) Typical height with frame: 35 mm (1 3/8th”) Minimum depth: 32 mm (1 1/4″).

The longest length of cable from the monitor the sensor should not exceed 300ft (91 m). As always, a full loop should be connected from the monitor to the sensors and back to avoid voltage drop on the system.

The adhesive tape included on the sensors and cradles has been thoroughly tested and will not damage the battery jar.

Power consumption depends on the number of sensors connected and the number of faults detected. The monitor consumes 0.36 watts; a single sensor consumes 0.024 watts with no faults. The total power consumption for common system configurations with no faults would be:

• 60-cell system: 0.36W + (60 * 0.024) = 1.44W
• 120-cell system: 0.36W + (120 * 0.024) = 2.88W
• 240-cell system: 0.36W + (240 * 0.024) = 5.76W

The peak power consumption with 4+ Level & Temperature faults would increase the monitor to 1.44W:

• 60-cell system: 1.44W + (60 * 0.024) = 2.88W max
• 120-cell system: 1.44W + (120 * 0.024) = 4.32W max
• 240-cell system: 1.44W + (240 * 0.024) = 7.2W max

One Monitor and one sensor would require no more than 0.1 amps at 12 volts.