Closed Loop Leak

Collector getting too hot again. Noticed a lack of closed loop flow and no pressure on the expansion tank gauge.
Solar Flowmeter Leak: Water Propylene Glycol was leaking out of the glass to brass area.  If I pushed on the glass with my finger the leak would increase.Solar Flowmeter Leak: Water Propylene Glycol was leaking out of the glass to brass area. If I pushed on the glass with my finger the leak would increase.
Flowmeter in handFlowmeter in hand
Collector Sensor: Collector at 200°F before I removed the flowmeter. The leak at the flow meter after purging yeaterday has not created a problem yet. Why is temperature so high? Well.... Flow is OK, 1. just a sunny day and 2. no use of the hot water because we are closed.Collector Sensor: Collector at 200°F before I removed the flowmeter. The leak at the flow meter after purging yeaterday has not created a problem yet. Why is temperature so high? Well.... Flow is OK, 1. just a sunny day and 2. no use of the hot water because we are closed.
Water Tank Bottom Sensor: Temperature before removing the flowmeter. We ran the hot water out a faucet for a few minutes to cool the tank and loop pressure.Water Tank Bottom Sensor: Temperature before removing the flowmeter. We ran the hot water out a faucet for a few minutes to cool the tank and loop pressure.
Tank Top Sensor: Readings before running the faucet and removal of flowmeter.Tank Top Sensor: Readings before running the faucet and removal of flowmeter.

You know what that means, Either a leak or the system overheated and boiled out some of the heat transfer liquid. We purged the system with the sump pump bought in June and purged a little air then the flow returned.
Found a leak! System has a small leak at the glass of the flow meter. When running the sump pump the flow meter leaked a steady drip. With the sump pump off and the system operating on it's own the leak slowed down.
I removed the flow meter from the work station. It is glued at the fittings. Tough to screw off. Once removed the flow meter and glass is a sealed unit. No o-rings to replace. I emailed First Solar and they will send me another unit.
Hope the collector will not be damaged in the meantime without any heat transfer flow. Temperature outside is 98°F and mostly sunny.
The three images of the controller sensor readings were right before the flowmeter was removed at 1:00 pm on 7/10/2011.