Conservation DistList Archives [Date] [Subject] [Author] [SEARCH]

Subject: Sling psychrometers

Sling psychrometers

From: Lisa Mibach <perygrine>
Date: Saturday, January 30, 1993
But Elizabeth, why would you WANT a sling psychrometer, when you can get
a battery operated one for little more money from Cole Parmer ( Cole
Parmer model N-03312-20).  So few people use the sling accurately
(whirling at the correct speed, for long enough, and held at arm's
length to avoid measuring body heat), and there is always the
possibility that it will go flying across the room.

The only thing *I* use a sling for is mentally writing off the Honeywell
techs who walk in with one, sling it a couple of times, and then try to
tell me that my equipment is out of calibration!!

One advantage to a battery operated model is that you can set it down
away from your body, and sneak up on it, holding your breath, to see
when the reading has bottomed out.  The reading is likely to be
consistent, because the battery (fresh, of course) is doing the
"slinging"; the main advantage is that when you have to deal with
engineers to get something fixed, you can skip the standard first delay
of challenging the validity of your data because you got it with a
sling...I have never had an engineer challenge data from a battery
operated psychrometer, or from recording hygrothermographs, when I
mention that I calibrate them with the psychrometer each time I change
the charts.

I mean, the point to monitoring is so that you can get something fixed,
right? (not just to fill filing cabinets) and the fewer hassles you have
getting the engineers to do it, the better!

::listening for the whir of slinging comments::

Lisa Mibach

                  Conservation DistList Instance 6:41
                 Distributed: Tuesday, February 2, 1993
                        Message Id: cdl-6-41-003
Received on Saturday, 30 January, 1993

[Search all CoOL documents]