Apera Instruments PH850 Bedienungsanleitung

Ve r s i o n 2.0

PH850 Portable pH Meter

User Manual

Ve r s i o n 2.0

Contents

1 Introduction .......................................................................................................................................... 1

1.1 Measurement Parameters ............................................................................................................... 1

1.2 Basic Features ................................................................................................................................ 1

1.3 pH Measurement Features ............................................................................................................. 1

2 Specifications ...................................................................................................................................... 2

2.1 Main Specifications ......................................................................................................................... 2

2.2 Other Specifications: ....................................................................................................................... 2

3 Instrument Description ........................................................................................................................ 2

3.1 LCD Display： ................................................................................................................................. 2

3.2 Keypad Functions ........................................................................................................................... 3

3.3 Meter Socket ................................................................................................................................... 4

3.4 Reading Stability Display Mode ...................................................................................................... 4

3.5 Automatic Lock Display Mode ......................................................................................................... 5

3.6 Automatic Power-off ........................................................................................................................ 5

3.7 Manual Temperature Compensation (MTC) .................................................................................... 5

4 pH Measurement ................................................................................................................................. 5

4.1 pH Electrode Information ................................................................................................................ 5

4.2 pH Calibration Consideration .......................................................................................................... 5

4.3 pH Meter Calibration (with an example of 3-point calibration) ........................................................ 7

4.4 Sample Test ..................................................................................................................................... 8

4.5 pH Electrode Maintenance .............................................................................................................. 9

5 mV Value Measurement: ................................................................................................................... 10

5.1 ORP Measurement ........................................................................................................................ 10

5.2 Notes ............................................................................................................................................. 10

6 Parameter Setting ............................................................................................................................. 11

7 What’s in the Kit ................................................................................................................................ 13

8 Recommended pH Electrodes for Different Applications .................................................................. 14

9 Warranty ............................................................................................................................................ 15

10 Appendix I: Parameter Setting & Factory Default Setting ................................................................. 16

11 Appendix II: Abbreviation Glossary ................................................................................................... 17

Introduction

Thank you for purchasing PH850 portable pH meter.

This product is a great combination of advanced electronics technology, sensor technology, and

software design, made for general water solution applications such as water treatment, environmental

monitoring, pools and spas, hydroponics, aquaculture, education, beverage making, cooling tower, etc.,

especially ideal for field use. In order to use and maintain the meter properly, please read the manual

carefully before use.

1.1 Measurement Parameters

Measurement

parameters

PH850

pH/mV

Conductivity/TDS

Temperature

1.2 Basic Features

● The microprocessor-based portable meter features automatic

calibration, automatic temperature compensation, function setup,

self-diagnostics, automatic power-off and low voltage display.

● The meter’s digital filter improves measurement speed and accuracy. There is a stable reading

indication on the display.

● The package includes a portable case, a meter, electrodes, standard solutions and all accessories,

which is convenient to use in field.

● The meter is dust proof and waterproof, meeting the IP57 rating.

1.3 pH Measurement Features

● 1-3 points automatic calibration, the meter provides calibration guide and automatic checking

function.

● The meter can recognize pH standard buffer solutions automatically. USA series and NIST series

buffer solutions can be selected.

● The meter provides three types of reading stability criteria.

Specifications

2.1 Main Specifications

Specifications

Range

(0.00~14.00) pH

Resolution

0.1/0.01 pH

Accuracy

±0.01 pH ±1 digit

Temperature compensation

(0~100)˚C (manual or automatic)

Range

±1,000 mV

Resolution

1 mV

Accuracy

±0.2% F.S ±1 digit

Temperature

Range

0~100˚C

Resolution

0.1˚C

Accuracy

±0.5˚C ±1 digit

2.2 Other Specifications:

Power

AAA batteries × 3 (1.5V×3)

IP rating

IP57

Dimension & Weight

Meter: (86×196×33) mm / 335 g

Portable case:(330×270×82)mm/1.3kg

PH850, EC850

Instrument Description

3.1 LCD Display

：

Diagram-2

LCD

HOLD

⑬

(1) — Parameter mode icons

(2) — Measurement reading

(3) — Prompts of special display mode

(4) — Units of measurement

(5) — Te m p e r a t u r e u n i t s ( ° C a n d ° F )

(6) — Units of pH and conductivity calibration value

(7) — pH and conductivity calibration value, and prompts of special display mode

(8) — Te m p e r a t u r e v a l u e , a n d p r o m p t s o f s p e c i al d i s p l ay m o d e

(9) — Te m p e r a t u r e c o m p e n s a t i o n i c o n s

ATC — automatic temperature compensation, MTC — manual temperature compensation

(10) — Calibration guide icon

(11) — Stability icon of readings

(12) — Low battery icon, when this icon appears, please replace the battery

(13) — Automatic reading hold icon

3.2 Keypad Functions

3.2.1. Keypad operations

Short press ----- <1.5 seconds; Long press ----- >1.5 seconds.

Turn on the meter: Press to turn on the meter.

Turn off the meter: In the measurement mode, press and hold for 2 seconds to turn off the meter.

Note: In the calibration mode or the parameter setup mode, pressing is invalid. Please press

key to return to the measurement mode, then press to turn off the meter.

Diagram-3

Keypad

Chart -1 Keypad operations and descriptions

Keypad

Operations

Descriptions

Short press"

# In the power-off mode, press this key to turn on the meter

Long press

# In the measurement mode, press and hold this key for 2 seconds to

turn off the meter.

Short/long press

Select measurement parameters:

# PH850 pH meter: →

# In the measurement mode: long press to enter manual temperature

compensation mode, then long press or momentary press this key

to change the temperature value (only one direction)."

# In the parameter setup mode, press this key to change the serial

number of the main menu and the submenu (only one direction)

# In the submenu mode, press this key to change parameters and

setup (only one direction)

Short press"

# In the measurement mode, press this key to enter the calibration

mode

# In the calibration mode or the parameter setup and auto lock-up

(HOLD) mode, press this key to return to the measurement mode

Short press

# In the measurement mode, press this key to enter the parameter

setup main menu"

# In the calibration mode, press this key to make calibration

# In the parameter setup mode, press this key to select programs"

3.3 Meter Socket

Chart-2 Sockets for Meters

3.4 Reading Stability Display Mode

When the measuring value is stable, smiley icon stays on LCD,

see Diagram – 4. If the smiley icon does not appear or flash, please do

not get the reading value or make calibration until the measuring value is

stable. Per parameter P1.3, there are 3 criteria for stability standard:

(Normal), (High), and (Low). The factory default is set “Normal”.

Models

Photos

Description

PH850 pH meter

●BNC socket (right) — connect

pH electrode or ORP electrode,

●RCA socket (middle) — connect

temperature probe

Diagram- 4

“High” is set for stability for longer time, “Low” is set for stability for shorter

time. User can select suitable stability criteria according to different testing

requirement.

3.5 Automatic Lock Display Mode

Select On from parameter P4.6 to turn on automatic lock-up display function.

When the reading value stabilizes more than 10 seconds, the meter locks the

measuring value automatically and displays HOLD icon, see Diagram – 5.

In the HOLD mode, press to release lock-up.

3.6 Automatic Power-off

The meter will be power-off if there is no operation for 20 minutes. The time of auto power-off can be set in

parameter setting P3.2

3.7 Manual Temperature Compensation (MTC)

When the temperature probe does not connect to the meter, long press key, temperature value flashes,

then long press key or short press key to change the temperature value in one way, and press

to confirm the temperature value to achieve Manual Temperature Compensation (MTC).

pH Measurement

4.1 pH Electrode Information

The meter connects to 201T-F plastic three-in-one combination pH electrode with built-in temperature

sensor, with automatic temperature compensation function. Electrode housing is made of polycarbonate

engineering plastics, which is corrosion and impact resistant. The BNC socket of electrode connects pH

socket. RCA socket connects temperature socket. When dipping pH electrode in the solution, please stir

the solution briefly to eliminate any air bubbles and allow it to stay in the solution until the reading is

stable

Note: The 201T-F Combination Glass pH/temp. Electrode is only suitable for general water solutions’ pH

measurement. For special applications such as low ion concentration or complex solutions, please refer to

Section 10 to find the most suitable pH electrode model.

4.2 pH Calibration Consideration

4.2.1. Standard buffer solution

The meter uses two series of standard buffer solution: USA series and NIST series, 3 solutions for each

series which are corresponding to calibration indication icons. Please see Chart - 3 for the two series of

standard buffer solution.

Diagram - 5

Chart - 3 pH standard buffer solution series

Calibration guide icons

pH standard buffer solution series

USA series (USA)

NIST series (NIS)

Three-point

calibration

1.68 pH and 4.00 pH

1.68 pH and 4.01 pH

7.00 pH

6.86pH

10.01 pH and 12.45 pH

9.18 pH and 12.45 pH

4.2.2. Three-point calibration

The instrument can perform 1-3 points calibration. The first point calibration must use 7.00 pH (or 6.86 pH)

standard solution, then select other standard solution to perform the second and the third point calibration.

See chart – 4.

Chart - 4 Three-point calibration mode

USA standard

NIST standard

Icons!

Suited range!

One-point

calibration

!"##$%&$

'"('$%&$

Accuracy

≤ ±0.1pH

Two-point

calibration

!"##$%&)*"##$+,$-"'(%&$

'"('$%&)*"#-$+,$-"'(%&$

Range<7.00pH

!"##$%&)-#"#-$+,$."*/%&$

'"('$%&)0"-($+,$-."*/%&$

Range>7.00pH

Three-point

calibration

!"##%&)*"##$+,-"'(%&$

)-#"#-$+,-."*/%&$

'"('%&)*"#-+,$-"'(%&$

)0"-($+,$-."*/%&$

Large Range

4.2.3. Calibration frequency

Calibration frequency depends on the sample, the electrode performance, and the required accuracy. For

high accuracy measurements (≤ ±0.03pH), the meter should be calibrated immediately before taking a

measurement. For general accuracy (≥±0.1pH), the meter can be calibrated and used for approximately

one week before the next calibration.

The meter must be recalibrated in the following situations:

(a) New probe or probe that has not been used for a long time

(b) After measuring acid (pH<2) or alkaline solutions (pH>12)

(d) If the solution’s temperature differs greatly from the calibration solution temperature.

4.3 pH Meter Calibration (with an example of 3-point calibration)

4.3.1. First point calibration

(a) Press key to enter the calibration mode, “CAL 1”

flashes at the top right of LCD and “7.00 pH” flashes at the bottom right of

LCD, indicating using pH 7.00 buffer solution to make the 1st point calibration.

(b) Rinse pH electrode in distilled or deionized water, allow it to dry, and

submerge it in pH7.00 buffer solution. Stir the solution briefly and allow it to

stay in the buffer solution until a stable reading is reached. When stable icon

stays on LCD, press key to calibrate, then 1st point calibration is

finished, the meter enters in measurement mode of one-point calibration.

Calibration guide icon will display at the bottom left of LCD.

4.3.2. Second point calibration

Press key to enter the calibration mode, “CAL 2” flashes at the top right

of LCD indicating to make the 2nd point calibration. Rinse pH electrode in

distilled or deionized water, allow it to dry, and submerge it in pH4.00 buffer

solution. Stir the solution briefly and allow it to stay in the buffer solution until

a stable reading is reached. The meter’s display will show scanning and

locking process of calibration buffer solution at the bottom right of LCD. When

the meter locks 4.00 pH, stable icon stays on LCD, press key to

calibrate the meter. LCD will display electrode slope of acidity range, then 2nd

point calibration is finished, the meter enters measurement mode of two-point calibration. Calibration guide

icons will display at the bottom left of LCD.

4.3.3. Third point calibration

Press key to enter the calibration mode, “CAL 3” flashes at the top right of LCD indicating to make the

3rd point calibration. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in

pH10.01 buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable

reading is reached. The meter’s display will show scanning and locking process of calibration buffer solution

at the bottom right of LCD. When the meter locks 10.01pH, stable icon stays on LCD, press the

key to calibrate the meter. LCD will display electrode slope of alkalinity range, then 3rd point calibration is

finished, the meter enters in measurement mode of three-point calibration.

Calibration guide icons will display at the bottom left of LCD.

Notes:

(a) The meter can perform 1-3 points calibration. When the 1st point calibration is done, the meter will enter

measurement mode of one-point calibration. Two-point and three-point calibration are in the same manner.

(b) During the calibration process, if measuring value is not stable yet (when does not stay on and the

key is pressed, then Er 2 will display. (See chart – 5). To s o l v e t h e problem, s i m p l y wait for to

Diagram- 6

stay on the screen before pressing

4.4 Sample Test

4.4.1. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in tested solution.

Stir the solution briefly and allow it to stay in the tested solution until icon stays on LCD and a stable

reading is reached, which is the pH value of test solution.

Diagram – 7 Calibration and measurement process of pH meter

4.4.2. Self-diagnosis information

During the process of calibration and measurement, the meter has self-diagnosis functions, indicating the

relative information as below, please refer to chart – 5.

Chart – 5 Self-diagnosis information of pH measurement mode

Display

Icons

Meaning

Check and Fix

Wrong pH buffer solution or the

recognition of calibration solution out of

range

1. Check whether pH buffer solution is correct.

2. Check whether the meter connects the

electrode well.

3. Check whether the electrode is damaged.

Pressing key too soon

Press key after icon appears and stays

During calibration, the measuring value

is not stable for ≥3min.

1. Check whether there are bubbles in glass bulb.

2. Replace with new pH electrode.

pH electrode performance error

zero potential <-60mV or >60mV,

slope <75%

1. Check whether there are bubbles in glass bulb.

2. Check whether pH buffer solution is correct.

3. Replace with new pH electrode.

Press to turn on

the meter

Press key to

enter the calibration

mode.

Submerge the electrode

in pH7.00 solution, press

key when

icon

appears.

1-point calibration is

done, the meter

enters measurement

mode

2-point calibration is

done, the meter

enters measurement

mode

Submerge the electrode

in pH4.00 solution, press

key when

icon appears.

Submerge the electrode

in pH10.01solution,press

key when

icon appears.

3-point calibration is

done, the meter

enters measurement

mode

Sample

Test

st point calibration

3rd point calibration

Press key to

enter the calibration

mode.

Press key to

enter the calibration

mode.

2nd point

calibration

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