I received delivery of the Sundstrom SR-500 with 570 helmet/faceshield this past Saturday. I used it in my shop for about 3 hours on Monday. I am impressed for sure! The system has as good filtration as anything out there on the market, and Sundstrom has been manufacturing respirator products for the mining and heavy industrial businesses for over a century. Their products are innovative to say the least.
I can tell this system is high quality.
I have used the Trend Airshield- Pro for 7 years now, and have two of them, one new in the box, as my first one seems to be going strong still. The SR-570 faceshield/helmet is lightweight, has a really wide field of view, and the faceshield will pivot up, and easily accommodates wearing glasses underneath. Airflow has two speeds......I tried both, and the low setting seems to put more air over the face than my Trend...at least it feels that way, as the seal around the face is much better than the Trend.
The filtration unit has replaceable filters, much less expensive than the Trend AS-P, and is worn on the waist with a tube going up the back to the rear of the helmet. Connections are secure, and much less strain on the neck than the Trend....I always did well with the Trend, and never knew how much I would notice the lighter weight of this SR-570 helmet. Especially when bending forward to pick up something, or leaning over the lathe bed for certain cuts. The unit came with one overlay which clips to the side pieces on the faceshield, not sticks to it with sticky strips like the Trend, which means a lot greater opportunity for cleaning the overlay as well as the faceshield without the sticky residue...to my mind both a money saver, and easily maintained optical clarity, which is crystal clear when the unit came in new. maintaining it should be a breeze, and new overlays, faceshield lens, and all other parts are available, replaceable as part of a modular system if they were ever needed. This unit is built strong, so unless some unexpected damage occurs, then only the consumables should ever be needed, like replacement filters, pre-filters and the overlays. Another big feature is that for those who want filtration of vapor hazards, this system allows one to add vapor cartridges to the particulate cartridges for filtration of vapors when finishing, and of course dust particulates at a small price.
The sturdiness/strength of the helmet and unit are obvious when one compares to the Trend [which I like, btw] but is in a different class in build. The lithiom battery pack will last 13 hours on a full charge, and tucks neatly into the back worn filtration unit. Assembly is not hard. I did put the pre-filters in the wrong place on my assembly, but corrected it after viewing a great instructional video on youtube on the SR-500 unit. I can say I am pleased to recommend this unit to any turner who wants premium breathing protection. I purchased from Ken Rizza at Woodturners Wonders, and his customer service was superb, and his black Friday price was the best I had ever seen on this unit anywhere. I saved nearly $800 from what a 3-M Versaflo system would have cost me, and have every bit as good filtration to protect my lungs.
As I mentioned earlier in my original post, I would do a review, so as others might benefit from this personal understanding from getting and using the unit.
The unit comes with a charger, which has a liight that goes from orange, to yellow, to green depending on the level of charge, and plugs into the battery pack once taken out of the back unit. Easy, peasy.