Advanced Wood Floors wrote:
Stephen, what exactly is the meter set into ? Looks almost like a concrete bull nose . Just curious .
Gosh I posted this awile ago. But the sensor is placed into a hole that drilled out to proper 40% depth of slab. Then what you see inserted into the sensor is the reader which can be taken out and put into other sensors without waiting another hour like a reusable one attached to a meter.
On the first pic the sensor was not pushed down into the hoe far enough which can give you a false reading because air can get into the hole easier. The second one is proper depth which should be about a quarter inch below the concrete surface.
These sensors are so much more accurate than resuable ones that will read the rh in the hole from the top of the hole to the bottom of the hole, therefore giving you an average of the rh of the concrete, not just at the 40% level. The 40% level is what you want to read and is the proper ASTM depth. When you drill the hole out you drill to 40% depth and the sensor is designed to leave about a 1/4 inch gap between it and the bottom of the hole. Therefore the space left under the sensor will equlibrate faster and give you the proper reading at 40% depth unlike the resuable ones connected to a resuable probe that simply drops down in a hole giving you a false reading.
Did that make sense?
Login
Register
FAQ
Search
