Hanna Instruments HI 8614N User Manual

Instruction Manual

HI 8614 • HI 8614L
HI 8615 • HI 8615L

pH and ORP

Transmitters

www.hannainst.com

1

Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using these instruments.
This manual will provide you with the necessary information for correct

use of these instruments, as well as a precise idea of their versatility.
If you need additional technical information, do not hesitate to e-mail

us at [e-mail] or view our worldwide contact list at
www.hannainst.com.

WARRANTYWARRANTY

WARRANTY

WARRANTYWARRANTY

HI 8614, HI 8614L, HI 8615 and HI 8615L are guaranteed for two

years against defects in workmanship and materials when used for
their intended purpose and maintained according to instructions.
Electrodes and probes are guaranteed for six months. This warranty is
limited to repair or replacement free of charge.

Damage due to accidents, misuse, tampering or lack of prescribed
maintenance is 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 instrument is to be returned to Hanna
Instruments, first obtain a Returned Goods Authorization number
from the Technical Service department and then send it with shipping
costs prepaid. When shipping any instrument, make sure it is properly
packed for complete protection.

TABLE OF CONTENTSTABLE OF CONTENTS

TABLE OF CONTENTS

TABLE OF CONTENTSTABLE OF CONTENTS

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during shipping.
If there is any noticeable damage, notify your Dealer.

Note: Save all packing material until you are sure that the instrument

functions correctly. All defective items must be returned in the
original packing material together with the supplied accessories.

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

HI 8614 / HI 8614L (pH) and HI 8615 / HI 8615L (ORP) are 2-wire
water-resistant transmitters specially designed for long distance
measurement of pH or ORP in industrial applications.

HI 8614 and HI 8615
and HI 8615L are models with LCD.

are models without LCD, and the HI 8614L

PRELIMINARY EXAMINATION ....................................................................... 3

GENERAL DESCRIPTION ............................................................................. 3

SPECIFICATIONS OF HI 8614 & HI 8614L .................................................. 5

SPECIFICATIONS OF HI 8615 & HI 8615L .................................................. 6

TERMINAL BOARD CONNECTIONS ................................................................ 7

pH CALIBRATION WITH AUTOMATIC TEMPERATURE COMPENSATION

(HI 8614 FAMILY) ................................................................................... 9

pH CALIBRATION WITH FIXED TEMPERATURE COMPENSATION

(HI 8614 FAMILY) ................................................................................. 12

ORP CALIBRATION (HI8615 FAMILY) ........................................................ 13

ELECTRODE CONDITIONING & MAINTENANCE ............................................... 17

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ............................... 20

INSTALLATION PROCEDURE AND EXAMPLES ................................................. 22

ACCESSORIES ........................................................................................ 25

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The LCD allows easy verification and monitoring of measured values,
and provides easier calibration and maintainance.

The pH or ORP signal is transmitted in a 2-wire current loop in the range
of 4 to 20 mA.

HI 8614 and HI 8614L, can be connected to the Hanna process
instruments HI 8510, HI 8710, HI 8711 or to any recorder,
computer or data monitor that accepts 4 to 20 mA input.

HI 8615 and HI 8615L, can be connected to the Hanna process
instruments HI 8512, HI 8720 or to any recorder, computer or data
monitor that accepts 4 to 20 mA input.

The transmitters use a universal BNC socket for quick and secure
connection to any electrode with a BNC connector.

SPECIFICATIONS OF HI 8614 & HI 8614LSPECIFICATIONS OF HI 8614 & HI 8614L

SPECIFICATIONS OF HI 8614 & HI 8614L

SPECIFICATIONS OF HI 8614 & HI 8614LSPECIFICATIONS OF HI 8614 & HI 8614L

For HI 8614
performed by the transmitter's ATC circuitry if the temperature probe
(HI 76608, optional) is attached. If ATC is not required, it is possible
to substitute the temperature probe with a fixed resistor.

The input is isolated from the current loop to eliminate problems
related to ground loop, low insulation cables, multiple electrode
connections, and a common mode voltage of up to 100 V ensures true
differential readings.

The terminal board of the transmitter provides for connection of power
supply, pH or ORP electrodes and temperature probe (for HI 8614
family models only).

The unit is enclosed in a protective casing conforming to IP 65
standards.

Ordering codes:

Code Range LCD

HI 8614 0.00 to 14.00 pH NO
HI 8614L 0.00 to 14.00 pH YES
HI 8615 ±1000 mV NO
HI 8615L ±1000 mV YES

family models the temperature compensation is

Range 4 to 20 mA / 0.00 to 14.00 pH
Resolution 0.01 mA / 0.01 pH
Accuracy

(@20°C/68°F) ±0.02 mA / ±0.02 pH
Typical EMC Deviation ±0.25 mA / ±0.2 pH
Calibration Offset: ±2.2 mA / ±2 pH

Slope: ±0.5 mA / 86 to 116%

Temperature Compensation

Fixed or automatic from 0 to 100°C

(32 to 212°F) with HI 76608 probe

Input Impedance 1012 Ohm
Output 4-20 mA (isolated)
Installation Category I I
Protection IP 65
Environment 0 to 50°C (32 to 122°F);

RH max 95% non-condensing

Power Supply HI 8614: 18 to 30 Vdc

HI 8614L: 20 to 36 Vdc
Load Max 500 Ohm
Dimensions 165 x 110 x 71 mm

(6.5 x 4.3 x 2.8'')

Weight 1 kg (2.2 lb.)

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SPECIFICATIONS OF HI 8615 & HI 8615LSPECIFICATIONS OF HI 8615 & HI 8615L

SPECIFICATIONS OF HI 8615 & HI 8615L

SPECIFICATIONS OF HI 8615 & HI 8615LSPECIFICATIONS OF HI 8615 & HI 8615L

TERMINAL BOARD CONNECTIONSTERMINAL BOARD CONNECTIONS

TERMINAL BOARD CONNECTIONS

TERMINAL BOARD CONNECTIONSTERMINAL BOARD CONNECTIONS

Range 4 to 20 mA / ±1000 mV
Resolution 0.01 mA / 1 mV
Accuracy

(@20°C/68°F) ±0.02 mA / ±5 mV
Typical EMC Deviation ±0.25 mA / ±15 mV
Calibration Offset: ±0.8 mA / ±100 mV

Slope: ±0.8 mA / 90 to 110%

Input Impedance 1012 Ohm
Output 4-20 mA (isolated)
Installation Category I I
Protection IP 65
Environment 0 to 50°C (32 to 122°F);

RH max 95% non-condensing

Power Supply HI 8615: 18 to 30 Vdc

HI 8615L: 20 to 36 Vdc
Load Max 500 Ohm
Dimensions 165 x 110 x 71 mm

(6.5 x 4.3 x 2.8'')

Weight 1 kg (2.2 lb.)

Unscrew the 4 screws and remove the top cover.

There are three cable glands on the transmitter cover. The large cable gland
with the split in the rubber is for the electrode.

Connect the positive supply to the strip terminal "+VE LOOP" and the
negative supply to the terminal "-VE LOOP" of the transmitter terminal
block.

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The wire between the transmitter and the recorder/indicator/controller
should be a PVC insulated two wire with a wire diameter of at least

0.7 mm. This wire is fed through one of the smaller cable glands. The
maximum distance between the power supply and the amplifier is
300 m (1000'). It is not necessary to use shielded cable. The
transmitter is protected against inversion of supply voltage.

Electrode connection: connect the BNC
of the cable to the BNC socket on the
transmitter.

pH CALIBRATION WITH AUTOMATICpH CALIBRATION WITH AUTOMATIC

pH CALIBRATION WITH AUTOMATIC

pH CALIBRATION WITH AUTOMATICpH CALIBRATION WITH AUTOMATIC

TEMPERATURE COMPENSATION (HI 8614 family)TEMPERATURE COMPENSATION (HI 8614 family)

TEMPERATURE COMPENSATION (HI 8614 family)

TEMPERATURE COMPENSATION (HI 8614 family)TEMPERATURE COMPENSATION (HI 8614 family)

INITIAL PREPARATION

• Connect the pH electrode to the
BNC socket.

• Connect the temperature probe to
the transmitter.

For HI 8614 family only: for automatic
temperature compensation, connect

the 2 terminals of the temperature probe
(HI 76608, optional) to "TEMP. PROBE"
terminals.

If automatic temperature compensation
is not required, short the "TEMP. PROBE"
terminals with a resistance according to
the external temperature:

Temperature (°C) Resistance (Ohms)

0 1634
10 1774
20 1922
30 2078
40 2242
50 2412
60 2590

Pour small quantities of pH7.01 and pH4.01 solution into two
clean beakers.

For accurate calibration use two beakers for each buffer solution, the
first one for rinsing the electrode, the second one for calibration. In
this way contamination of the buffers is minimized.

To get accurate readings, use pH7.01 and pH4.01 if you are going
to measure acid samples or pH 7.01 and pH 10.01 for alkaline
measurements.

Note: With HI 8614L the instruments

display can be used during
calibration without the need to
connect the ammeter and the
reading is directly expressed in
pH units.

A 2 kohm resistor is factory mounted for 25°C temperature compensation.

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PROCEDURE

• Disconnect the +ve supply cable from "+VE LOOP" terminal and
connect a 20mA f.s. ammeter between the +ve cable and "+VE
LOOP" terminal.

• Adjust the slope trimmer until the ammeter reads 8.58 mA for

HI 8614

and HI 8614L or the display shows "4.01" at 25°C. For

other buffer temperatures, refer to page 12 for the appropriate
mA / pH reading.

If you are using pH 10.01 buffer
solution adjust the slope trimmer
until the ammeter read 15.43 mA at
25°C (77°F) or the value indicated at
page 12.

• Remove the protective cap from the electrode,
rinse it with some pH 7.01 solution or immerse it
in the pH 7 rinse solution, then immerse the pH
electrode and temperature probe into pH7.01
calibration buffer solution; shake briefly and wait
for the reading to stabilize.

Note: The tip of the electrode should be

submerged approximately 4 cm (1½")
into the solution. The temperature probe
should be located as close to the pH
electrode as possible.

• Adjust the offset trimmer until the ammeter reads 12 mA or the
display shows "7.01" if the temperature of the buffer is at 25°C.

For other buffer temperatures, refer
to page 12 for the appropriate
mA / pH reading.

• Rinse the electrode with tap water or distilled
water and a small amount of pH 4.01 or 10.01
buffer solution or immerse it in the pH 4 rinse
solution (2nd calibration point). Dip the electrode
and the temperature probe into pH 4.01 (or

10.01) calibration buffer solution, shake briefly
and wait for a few minutes for reading to stabilize.

FOR HI8614L ONLY

The Display Module is factory calibrated, so that the LCD display
results are referred to the 4-20 mA loop current (e.g. LCD displays

0.00 pH when the loop current is 4.00 mA and displays 14.00 pH
when the current is 20.00 mA).

Under normal application, adjustment on this module may not be
necessary.

If routine check is required, the following procedures shall be performed.

• Follow the procedure at page 10 to perform calibration on the
transmitter module (using a ammeter).

• Simulate a 4.00 mA loop current for the transmitter (i.e. 0.00 pH
as Electrode input) and check for display reading.

• Simulate a 20.00 mA loop current for the transmitter (i.e.

14.00 pH as Electrode input) and check for display reading.

Note: When HI 8614 or HI 8614L instruments are used in

conjunction with the new Hanna indicator HI 8510 or
controllers HI 8710 and HI 8711, the calibration can also
be performed on the indicator/controller. In this case slight
calibration adjustment can be made on the indicator/
controller even if the whole system calibration is advised,
always starting from the transmitter.

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