Tristate Machinery Dismantlers Forum > ILLINOIS
> Machine Parts
> Used
> Without Warranty
> 24V battery voltage meter, voltmeter 22 to 29V
24V battery voltage meter, voltmeter 22 to 29V
24V Battery Monitor Voltmeter, 22.0 to 29.0 Volts
This is a 250uA microammeter with an inline resistor and zener diode which converts it to read from 22.0 to 29.0V, which is ideal for voltage based monitoring of the state of charge, and the charging of 24V battery systems.
The scale is marked 0 to 5 and I have measured this to correspond to
0: 22.0V (just slight movement of the needle)
The voltage range covered by this meter is the range that you are actually interested in: At 29V your battery is in serious overcharge or open-circuit, and at 22.0V it's empty or has a short-circuit cell. Dials with wider ranges give you less detail.
The panel meter is a movement with 250uA (microamps) at full scale, so the current used by this system is inherently tiny, substantially less than the self-discharge rate of most batteries so it is suitable for permanent connection. There is a 20cm red and green lead attached.
http://homepage.ntlworld.com/henry01/for_sale/24v_meter_rear.jpg
I have some larger meters on separate listings which may be of interest, and one just like this for 12V systems.
