Calibration and Verification Procedures
The following procedures require 33% & 75% RH references available through Extech.
Verification (Checking the 33% or 75% RH Calibration)
Skip the verification and go directly to the Cal procedure below if it has already been determined
that the meter calibration is compromised or if the E2 display appears.
1.
Insert meter’s sensor into the 33% or 75% salt reference bottle
2.
Place the meter and bottle inside the meter case
3.
Wait 40 minutes and then check if the reading is wi
thin the published specifications
Relati
ve Humidity Calibration (33% and 75%)
For best results, store the meter and salt bottles in the closed case during the 40-minute
stabilization process. The 33% and the 75% calibrations must both be performed.
1. Start with the meter OFF.
2.
Insert the meter’s sensor into the 33% salt reference bottle. Put the
meter and
the bottle in the case and close the case. Allow
the
meter to stabilize for 40
minutes. Note th
at for diagnostic purposes the stabilizat
ion process can be
shortened to 5
mi
nutes.
3.
Open the case but leave the pen in the bottle. While holding down t
he recessed
CAL button with a paper clip, press and release the ON-OFF button. Continue to hold down
the CAL button, the unit will turn ON and the display w
ill flash once.
4.
When only the F and C icons appear, release the CAL butt
on.
After releasing th
e CAL button, the display will indicate either F
or C (depending on which one was
selected).
5.
Press and hold the RESET button for 3 seconds. %MIN w
ill
appear in the
display after the RESET button is rel
eased.
6.
Press and release the CAL button. ‘S’ will briefly display
followed by %MAX display.
7.
Turn the meter OFF. Insert the meter sensor into th
e 75% salt
reference bottle. Put the meter and the bottle in the case and close the case. Wait 40 minutes.
8. Open the case but leave the pen in the bottle. While holding down the recessed CAL
button
with a paper clip, press and release the ON-OFF button. Continue to hold down the CAL
button, the unit will turn ON and the display w
ill flash once.
9.
When only the F and C icons appear, release the CAL butt
on.
After releasing th
e CAL button, the display will indicate either F
or C
.
10.
Press and hold the RESET button for 3 seconds. %MIN will appea
r in the
display
after the RESET button is
released.
11.
Press and hold the RESET button again for 3 seconds. %MAX will
appear
after the ke
y is re
leased.
12. Ensure
that %MAX is displayed and then pr
ess
CA
L. ‘S’ will appear briefly and the meter w
ill
return t
o normal operation. Turn the power
OFF;
calibr
ation is co
mplete.
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