User Guide

9
CALIBRATION CHECKING PROCEDURE
All Hanna relative humidity transmitters have
been precalibrated at the factory.
Hanna Instruments uses state-of-the-art ther-
mal humidity chambers for this purpose.
It is generally recommended to have all RH
transmitter recalibrated at least once a year.
For an accurate annual recalibration, contact
your nearest Hanna Service Center.
You can also check the status of your HI 8666
by using the Hanna mini-calibration cham-
bers HI 7102.
The kit includes two thermally
isolated chambers, each one
equipped with a threaded cap
and three bottles containing
the appropriate precalibrated
saturated salts to produce a
known RH value.
This calibration checking procedure is written
to verify that the meter still meets the electri-
cal calibration specifications of the factory.
PREPARING THE CALIBRATION
SOLUTIONS
• Pour approximately 26 cc
of distilled water into a
glass container.
• Immerse this container
into a bath of ice and wa-
ter and shake briefly.
• Slowly add the contents
of a HI 7111 bottle con-
taining LiCl into the glass
container while continuing
to shake.
L
i C
l
11
.1
%
N
a
C
l
7
5
.4
%
C
A
L
IB
R
A
T
IO
N
K
IT
H
2
O
26 cc
Li Cl