Finicky ALGE photocells

First off, I'd look at the old threads about lens "fogging" and how to clean them. Also, check the reflectors on the RLS1n sensors to make sure they are in good shape.

Short of that, I'm sure that Fred will be able to lep you make it right.

I tried searching for threads about fogging and could only find information about condensation. This is not our problem. We have this problem when trying to align in my 70 degree basement. Are you referring to some type of permanent fogging on the inside of the lens? If so, any suggestions on search keywords?

Start with the basics.

95% of all problems with all timing gear can be traced to power issues.

Make sure your batteries test at least 1.2 volts with a digital voltmeter. I am sure you have done this but it doesn't hurt to check.

Then make sure that the battery contacts inside the cell body are making good contact. Scrape the contacts with a knife or abrasive. Cells that have been used on hills where Urea or other chemicals have been used can get corroded. We often re tin the contacts with solder if this has happened.

The meter on a cell with a fresh battery should move 1/4 of the way into the black field when turned on.

The meter should be aligned so that the black field is to the left when looking at it.

ALL ALGE CELLS can be used with reflectors. The RX models can be used with reflectors if the switch is placed on ADJUST. Try aligning each individual cell with a reflector. Pointing the cell at any kind of reflector indoors should get a quick response. If not I would suspect the meter is bad. Point the cell at the reflector and connect a timer to it. If it sends a pulse then the meter is definitely defective and needs to be replaced.

Failure to send a pulse means that the transmit or receive diodes have been overloaded and need replacement. A cell that has been exposed to direct sunlight through the lens can be damaged. this is usually a problem in the Western States where the sun tracks lower and is more intense. Look into the cell under a bright light. Look for melted plastic caused by the lens focusing the sun like a magnifying glass. If you see a track of melting that goes over the diode it is surely damaged.

Each cell should work properly with a reflector. You should be able to make them work effectively at a 20>25m distance with no problems. If they don't than they need service.

Combine them into TX/RX pairs once they work individually.

Thanks, Fred. I cleaned the battery contacts & problem solved. These were bad on 3 of 4 photocells.

I try to run the cells with power from the clock whenever possible, with the battery installed as a backup. I have made special permanent cables with #16 wire to run about 300 yards from timing to the GS finish in order to use the clock power.
Regardless, the battery clips in the cells are a problem, and need routine cleaning. I use a gummy pencil eraser to remove the oxidation film from both the contacts and the battery before installing the battery. If the needle does not move when a good cell is turned on, it is not getting power from the battery.