Hanna Instruments HI 7871 User Manual
Instruction Manual
HI 7871- HI 7873
HI 7874
Level Controllers
http://www.hannainst.com
Compliance with the CE Directives
These Instruments are in
WARRANTYWARRANTY
WARRANTY
WARRANTYWARRANTY
HI 7871, HI 7873 and HI 7874 are warranted for one year
against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. This warranty
is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed
maintenance 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 failure. If the repair is not
covered by the warranty, you will be notified of the charges incurred. If
the instrument 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.
To validate your warranty, fill out and return the enclosed warranty card
within 14 days from the date of purchase.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895 , USA.
Hanna Instruments reserves the right to modify the design, construction
and appearance of its products without advance notice.
ISTR7871R1 04/97PRINTED IN PORTUGAL
Dear Customer,
Thank you for choosing a Hanna product. This manual will
provide you with the necessary information for the correct
operation of the instrument. Please read it carefully before
using the controller. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.
These instruments are in compliance with directives
EN 50081-1 and EN 50082-1.
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
Remove the instrument from the packing material and
examine 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 to the Dealer in its original
packing.
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
HI 7871 and HI 7873 are 2-wire transmitter level controllers designed especially for long distance control of liquid
levels in tanks (e.g. in biological and industrial water
treatment). A complete system should consist of:
• HI 7871 or HI 7873 level controller;
• HI 7874 transmitter and sensor holder;
• HI 7164 11-pin connector;
• 3 or 4 measuring bars.
The level transmitter is basically a molded electrode holder
with 4 sockets to screw in the level sensors. The longest bar
has to be the common electrode and connected to the COM
port. The remaining electrodes can be connected in any
sequence, after cutting them to the required lengths.
HI 7874 contains the completely resinated amplifier circuit
and the 2-wire terminal board. It also comes with a
mounting bracket for quick and easy installation.
HI 7874 uses stainless steel measuring bars and employs 9V
peak to peak A.C. to measure the liquid level. It can be
used in liquids with conductivity greater than 10 µS/cm
(µmho/cm).
HI 7871 requires only 3 electrodes, whereas HI 7873 needs 4.
HI 7871 is a basic high and low level controller. HI 7873
has an overflow alarm control as an additional feature.
MECHANICAL DIMENSIONSMECHANICAL DIMENSIONS
MECHANICAL DIMENSIONS
MECHANICAL DIMENSIONSMECHANICAL DIMENSIONS
FRONT VIEW
73mm
79mm
2.87"
3.11"
42mm
1.65"
49mm
1.93"
SIDE VIEW
79mm
3.11"
0.25/4mm
0.01/0.160"
76mm
3"
95mm MIN
3.74"
ADJUSTABLE
LOCATION
BRACKET
Adjustable brackets (supplied) allow the controller to slide
into the cutout and hold the unit in place. 95 mm (3.74")
is the minimum space required to install the controller with
the cables connected.
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FRONT VIEW
1
2
3
REAR VIEW
1. OVER LED (HI 7873 only)
indicates an overflow condition
2. HIGH LED indicates full tank
4
3. LOW LED indicates low liquid
level
4. 11-pin Socket
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