Hanna Instruments HI 8614 User Manual

Instruction Manual

HI 8614 • HI 8614L

HI 8615 • HI 8615L

pH and ORP T ransmitters

HI8614L

pH INDICATOR

& TRANSMITTER

www.hannainst.com

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 tech@hannainst.com.

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 & HI 8614L) ....... 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

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.

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.

SPECIFICATIONS OF HI8614 & HI8614L

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.)

HI8614

pH TRANSMITTER

HI8614L

pH INDICATOR

& TRANSMITTER

SPECIFICATIONS OF HI8615 & HI8615L

TERMINAL 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

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.)

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.

HI 8615 ORP TRANSMITTER

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 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 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 7004

HI 7004 HI 7007

For accurate calibration use two beakers for each buffer solution, the first one for rinsing the electrode, the second one for calibration.

RINSE

HI 7007

CALIBRATION

HI 7007

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.

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 tem-

HI 7007

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

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

HI 7004

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).

Note: the tip of the elec-

trode should be submerged approximately 4 cm (1½") into the

4 cm

1½"

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.

SLOPE ADJUSTMENT OFFSET ADJUSTMENT

If you are using pH 10.01 buffer solution adjust the slope trimmer until the am-

meter 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).

1110

+ 13 hidden pages