Dwyer Instruments PHO-1 Specifications-installation And Operating Instructions

Bulletin E-90-PHO

Model PHO-1 pH/ORP/Temperature Meter

Specifications - Installation and Operating Instructions

3-5/16

(84.14)

2

(50.8)

2-31/32

(74.9)

7-11/32

(186.20)

The microprocessor based pH/ORP/Temperature Meter

offers quick response and high accuracy. Simultaneously mea­sure and display pH from 0 to 14 pH (0 to 1999 mV) and tem­peratures up to 200°F (100°C). Model PHO-1 meter features
manual or automatic temperature compensation, auto buffer
recognition, and data logging capabilities. The recording inter­val can be defined by the user. The meter accepts any pH
electrode with a BNC connector. For additional convenience,
select model PHO-1K kit, which contains a meter, RS-232
cable, batteries, software, pH electrode, temperature probe,
gender changer, carrying case and manual.

Measurement

pH

mV

Temp (°C)

Temp (°F)

Range

0 to 14 pH

0 to 600 mV

601 mV to 1999 mV

0 to 100°C

32 to 200°F

Resolution

0.001 pH

0.1 mV

0.1°C

0.1°F

Accuracy

±0.01 pH

±(0.05% + 1 digit)

±0.1%

±0.5°C

±0.9°F

2-13/16

(71.4)

1-5/8

(41.2)

CRITICAL DIMENSION
STANDARD TOLERANCES UNLESS NOTED:
ALL DECIMAL DIMENSIONS ±.005
ALL ANGLES ±1˝

SPECIFICATIONS

Input: pH electrode with BNC connector, temperature

probe.

Range: pH: 0.00 to 14.00 pH; mV: 0 to 1999 mV.

Te mperature: 32 to 200°F (0 to 100°C).

Operating Temperature: 32 to 122°F (0 to 50°C).

Compensated Temperature Limit: Manual (MTC): 32 to

200°F (0 to 100°C); Automatic (ATC): 32 to 200°F (0 to

100°C).

Operating Humidity: Max. 80% RH.

Sampling Rate: About 1.5 time/sec.

Battery LIfe: Approximately 120 hours.

Power Supply: Six “AA” batteries.

Power Current: Approximately 20 mA DC.

Data Output: RS-232 PC serial interface.

Dimension: 7.4˝ x 2.9˝ x 2˝ (187 mm x 73 mm x 53 mm).

Weight: 1 lb (.45 kg) meter only.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Page 2

FRONT PANEL DESCRIPTION

1. LCD Display

2. Input Socket: BNC connector for pH and mV

3. Input Socket: Earphone jack for temperature probe

4. POWER Button

5. Button for moving to the desired parameters (LEFT Arrow
Key)

6. Button for increasing the value of parameters (UP Arrow
Key)

7. Button for moving to the desired parameters (RIGHT Arrow
Key)

8. Button for decreasing the value of parameters (DOWN Arrow
Key)

9. Button for entering/escaping the mode of parameter set­tings (ENTER Button)

10.Button for selecting temperature unit in °C (°C Temperature
Button)

11.Button for selecting temperature unit in °F (°F Temperature
Button)

12.TOGGLE Button

13.pH Button

14.mV Button

15.MEMORY Button

16.READ Button

17.CALIBRATION Button

18.TEST Button

SETUP PROCEDURE

Please follow the steps to set up the parameters for calendar
year, month, day and time (hour:minute), manual temperature
compensation (MTC), and recording time interval.

1. Press ENTER for 2 seconds until a second beep is heard.
This signals that you are entering the setup mode.

2. To change the year press the UP or DOWN arrow keys.

3. Press the RIGHT arrow key to set up for next parameter.

4. To change the month press the UP or DOWN arrow keys.

5. Press the RIGHT arrow key to set up for next parameter.

6. To change the date, press the UP or DOWN arrow keys.

7. Press the RIGHT arrow key to set up for next parameter.

8. To change the hour press the UP or DOWN arrow keys.

9. Press the RIGHT arrow key to set up for next parameter.

10.To change the minute press the UP or DOWN arrow keys.

11.Press the RIGHT arrow key to set up for the next parame-

ter.

12.To change manual temperature compensation (MTC), press
the UP or DOWN arrow keys.

pH TEMPERATURE COMPENSATION

pH Temperature Compensation ensures proper pH values by
correcting temperature variances. Compensation is accom­plished manually by making adjustments in the compensation
mode or automatically by using the temperature sensing probe
in tandem with the pH electrode.

Temperature Compensation Mode:

1. Automatic temperature compensation (ATC): Plug the
temperature probe into the top jack marked temperature.
ATC will appear at bottom of the display. Immerse probe in
test solution.

2. Manual temperature compensation (MTC): Manually enter
the temperature of the test solution between 0 and 100°C.
(An ATC probe will override manual compensation.) The
preset temperature of pH Meter is 25°C. (See setup
procedure to set MTC).

13.Press the RIGHT arrow key to set up for the next parame­ter.

14.To change the interval time, press the UP or DOWN arrow
keys. This is the time between measurements in the
continuously recording mode.

15.To finish the settings and return to measuring mode, press
ENTER.