Instruction Manual
HI 8666
RH/°C TRANSMITTER
www.hannainst.com
WARRANTY
HI 8666 RH/°C transmitter is warranted for two years against
defects in workmanship and materials when used for its intended purpose
and maintained according to instructions. This warranty is limited to re-
pair or replacement free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed main-
tenance are not covered.
If service is required, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number, date of purchase,
serial number and the nature of the problem. If the repair is not covered
by the warranty, you will be notified of the charges incurred. If the instru-
ment is to be returned to Hanna Instruments, first obtain a Returned
Goods Authorization Number from the Customer Service department and
then send it with shipment costs prepaid. When shipping any instrument,
make sure it is properly packaged for complete protection.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.
Dear Customer,
Thank you for choosing a Hanna product.
This manual will provide you with the necessary information
for correct operation of the instrument. Please read it carefully
before using the product.
If you need additional technical information, do not hesitate
This instrument is in compliance with the directives.
Remove the instrument from the packing material and exam-
ine it carefully. If any damage has occurred during shipment,
immediately notify your Dealer or the nearest Hanna Customer
Service Center.
Note: Conserve all packing material until the instrument has
been observed to function correctly. Any defective item
must be returned in its original packing.
PRELIMINARY EXAMINATION
The HI 8666 is a compact transmitter can be plugged into its
wall-mounted receptacle for on-site, continuous monitoring of
relative humidity and temperature in critical or controlled
environments.
Each 4-20 mA analog signal can be sent to remote panel
meters, controllers, or data acquisition systems.
The signals are to be powered by separate external voltage
sources.
The meter is equipped with a removable sintered cap to
protect the sensor against dust or unclean environments.
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 normal condition, place the probe into
the LiCl well (HI 7102) for 24 hours.
GENERAL DESCRIPTION
FUNCTIONAL DESCRIPTION
1. Sintered cap
2. RH and temperature sensor housing
3. Electrical connections
4. RH connection terminals
5. Temperature connection terminals.
SPECIFICATIONS
Range RH 0% (4 mA) to 100% (20 mA)
Temperature -20°C (4 mA) to 60°C (20 mA)
Accuracy RH ±2% (5 to 95% RH)
Temperature ±1% FS
Typical EMC RH ±2.5% (±0.4 mA)
Deviation Temp. ±1°C (±0.2 mA)
Response Time 6 seconds without sintered filter;
60 seconds with filter
Output Signal 4 to 20 mA
Max Loop Impedance 50 x (Input voltage-10) Ohm
Installation Category II
Power Supply 10-30 Vdc
Environment 0 to 60°C (32 to 140°F)
Dimensions 79 x 49 x 150 (3.1 x 1.9 x 5.9”)
Weight 150 g (5.3 oz.)
MECHANICAL DIMENSIONS
Connect the transmitter with a 2-wire cable to each of the
connector terminals on the back of the instrument.
See pictures below for connection examples.
Note: Carefully observe the polarity for operations without
any damage.
OPERATIONAL GUIDE
REAR PANEL
Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.
(180 pagine)
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