Hanna Instruments HI 8615, HI 8614L, HI 8615L Instruction Manual

1

Instruction Manual

HI 8614 • HI 8614L

HI 8615 • HI 8615L

pH and ORP T ransmitters

HI8614L

pH INDICATOR

& TRANSMITTER

pH

www.hannainst.com

32

PRELIMINARY 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 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.

Two versions are available: the standard

HI8614 and HI8615, and the HI8614L and
HI8615L models with LCD.

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 2­wire current loop in the range of 4 to 20 mA.

HI8614 and HI8614L can be connected to
the Hanna process instruments HI8510T,
HI8710T or HI 8711T, or to any recorder,
computer or data monitoring device that ac­cepts 4 to 20 mA input.

HI8615 and HI8615L can be connected to
the Hanna meters HI8512T, HI8720T or to
any recorder, computer or data monitor that
accepts 4 to 20 mA input.

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.

If you need additional technical information,
do not hesitate to e-mail us at
[e-mail].

These instruments are in compliance with the

directives.

TABLE OF CONTENTS

Preliminary Examination............................. 3

General Description .................................... 3

Specifications of HI8614 & HI8614L .......... 5

Specifications of HI8615 & HI8615L........... 6

Terminal Board Connections....................... 7

pH Calibration with Automatic Temperature

Compensation (HI8614 & HI8614L) .......... 9

pH Calibration with Manual Temperature

Compensation (HI8614 & HI8614L) ....... 13

ORP Calibration (HI8615 & HI 8615L) ....14

Electrode Conditioning and Maintenance.. 19
Temperature-Resistance Correlation for

HANNA pH Sensitive Glass .................... 23

Installation Procedure and Examples ...... 25

Accessories ..............................................28

Warranty .................................................. 34

CE Declaration of Conformity ................. 35

54

SPECIFICATIONS OF HI8614 & HI8614L

HI8614

pH TRANSMITTER

HI8614L

pH INDICATOR

& TRANSMITTER

pH

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

For HI8614 and HI8614L the temperature
compensation is performed by the transmitter's
ATC circuitry if the temperature probe
(HI76608, 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 HI8614
and HI8614L models only).

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

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 HI76608 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

HI8614: 18 to 30 Vdc

HI8614L: 20 to 36 Vdc
Load Max 500 Ohm
Dimensions 165 x 110 x 90 mm

(6.5 x 4.3 x 3.5'')

Weight 1 kg (2.2 lb.)

76

TERMINAL BOARD CONNECTIONS

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.

ELECTRODE

CABLE GLAND

WIRE CABLE GLANDS

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

SPECIFICATIONS OF HI8615 & HI8615L

HI 8615
ORP TRANSMITTER

mV

HI 8615
ORP TRANSMITTER

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

HI8615: 18 to 30 Vdc

HI8615L: 20 to 36 Vdc
Load Max 500 Ohm
Dimensions 165 x 110 x 90 mm

(6.5 x 4.3 x 3.5'')

Weight 1 kg (2.2 lb.)

98

pH CALIBRATION WITH AUTOMATIC

TEMPERATURE COMPENSATION

(HI 8614 & HI 8614L)

Initial preparation

• Connect the pH electrode
to the BNC socket.

• Connect the temperature
probe to the transmitter.

Pour small quantities of pH 7.01 and pH 4.01
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.

To get accurate readings, use pH7.01 and
pH 4.01 if you are going to measure acid
samples or pH 7.01 and pH 10.01 for alkaline
measurements.

Note: with HI8614L the instruments display

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

HI 7004 HI 7007

HI 7004

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.

For HI8614 & HI8614L only: for
automatic temperature com­pensation, connect the 2 termi-

nals of the temperature probe
(HI76608, 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

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

HI 7007

CALIBRATION

HI 7007

RINSE

1110

For other buffer temperatures, refer to page
13 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 pH4 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.

• Adjust the slope trimmer until the amme­ter reads 8.58 mA or the display shows
"4.01" at 25°C. For other buffer tempera­tures, refer to page 13 for the appropriate
mA / pH reading (HI 8614L).

If you are using pH 10.01
buffer solution adjust the
slope trimmer until the am­meter read 15.43mA at
25°C (77°F) or the value in­dicated at page 13.

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 loop current is 4.00 mA and

displays 14.00 pH when current is 20.00mA).

HI 7004

mA

mA

SLOPE ADJUSTMENT
OFFSET ADJUSTMENT

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.

• 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 pH 7.01
calibration buffer solution;
shake briefly and wait for
the reading to stabilize.

Note: the tip of the elec-

trode 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 12mA or the display shows "7.01"
(HI 8614L only) if the temperature of the
buffer is at 25°C.

HI 7007

4 cm

1½"

mA

SLOPE ADJUSTMENT
OFFSET ADJUSTMENT