Hanna Instruments HI 8666 User Manual
Instruction Manual
HI 8666
RH/°C Transmitter
www.hannainst.com
1
This Instrument
is in Compliance with
the CE Directives
Dear Customer,
Thank you for choosing a Hanna Instruments
Product.
Please read this instruction manual carefully
before using the instrument.
This manual will provide you with all the neces-
sary information for the correct use of the
instrument, as well as a precise idea of its
versatility in a wide range of applications.
If you need additional technical information,
do not hesitate to e-mail us at
tech@hannainst.com.
This instrument is in compliance with the
directives.
TABLE OF CONTENTS
Preliminary Examination ............................ 3
General Description.................................... 3
Functional Description................................ 4
Specifications ............................................ 5
T erminal Board and Installation................... 6
Calibration Checking Procedure ................. 9
T ables for RH Checking............................ 14
T ables for Temperature Checking.............. 18
Accessories............................................. 21
Warranty .................................................. 22
CE Declaration of Conformity ................... 23
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure
that no damage has occurred during shipment. If noticeable damage is found, immediately notify your Dealer.
Note: Conserve all packing material until the
instrument has been observed to function correctly because all defective
items must be returned to the Dealer
in their original packing.
GENERAL DESCRIPTION
HI 8666 is a 2-wire, 4 to 20 mA relative
humidity and temperature transmitter. The
instrument transmits electrically isolated outputs that are linear and proportional to RH%
and °C. It can be surface or panel mounted,
and used with a detachable connector. The
power must be supplied from an external
source from 12V to 24V. See the diagrams
on pages 4-6 of this instruction manual for
connections from the transmitter to other
equipment, such as recorder.
Note: After 30 minutes of measurements over
90% RH, the probe sensors could experience secondary absorption, leading to approximately +6% RH saturation. This means that the readings will
be inaccurate. To restore the probe to
a normal condition, place the probe
into the LiCl well of HI 7102 for 24
hours (see page 9).
3
FUNCTIONAL DESCRIPTION
1 23
1) Sintered Cap
2) Relative Humidity and Temperature Sensors
3) 11-Pin Connector
SPECIFICATIONS
Range RH 0 (4 mA) to 100% (20 mA)
Resolution RH ±0.125% RH, ±0.02 mA
Accuracy RH ±2% RH (5 to 80% RH)
Typical EMC RH ±2.5% RH, ±0.4 mA
Deviation °C ±1°C, ±0.2 mA
Output Signal 4 to 20 mA
Response Time 6" without sintered filter,
Power Supply 12 to 24V externally supplied
Maximum Loop 600 ohm
Impedance
Environment -20 to 60°C (-4 to 140°F);
Dimensions 79 x 49 x 140 mm
Weight 200 g (7 oz.)
°C -20 (4 mA) to 60°C (20 mA)
°C ±0.1°C, ±0.02 mA
±4% RH (80 to 90% RH, 0 to 40°C)
°C ±1% of span
1' with filter
5 to 95% RH
(3.1 x 1.9 x 5.5")
5
TERMINAL BOARD AND INSTALLATION
The HI 8666 Transmitter has an 11-pin connector at the rear of the instrument.
Connect it to a UNDECAL relay socket.
The terminals are:
1 +°C: Positive Terminal;
9 -°C: Negative Terminal;
4 +RH: Positive Terminal;
7 -RH: Negative Terminal.
Terminals 2, 3, 5, 6, 8, 10 and 11 are not
connected.
See the following figures for recommended
installation:
1.
Passive and isolated receivers
+
•
Power
Supply
•
-
RH%
Receiver
-
+
•
•
•
4
•
+
RH%
Transmitter
-
•
7
°C
Receiver
-
+
•
•
1
•
+
°C
Transmitter
-
•
9
2. Passive and not isolated receivers
(Common positive)
RH%
+
•
+
•
Power
Supply
•
-
Receiver
-
•
4
•
+
RH%
Transmitter
-
•
7
Receiver
Transmitter
3. Passive and not isolated receivers
(Common negative)
-
•
RH%
Receiver
+
•
Receiver
°C
+
°C
°C
+
-
•
1
•
-
•
9
•
-
•
Power
Supply
•
+
7
•
-
RH%
Transmitter
+
•
4
•
7
9
•
-
°C
Transmitter
+
•
1
4. Active receivers
(both isolated or not)
RH%
Receiver
°C
Receiver
+
•
-
•
+
•
-
•
4
+
•
Transmitter
7
-
•
1
+
•
9
Transmitter
-
•
RH%
°C
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