Instruction Manual
This HM Digital, Inc. ("the Company") product ("PH-200") is warranted to the purchaser against
defective materials and workmanship for one (1) year from the date of purchase.
What is covered: Repair parts and labor, or replacement at the Company's option. Transporta-
tion charges for repaired or new product to be returned to the purchaser.
What is not covered: Transportation charges for the defective product to be sent to the
Company. Any consequential damages, incidental damages, or incidental expenses, including
damages to property. This includes damages from abuse or improper maintenance such as
tampering, wear and tear, water damage, or any other physical damage. The PH=200 is
watertight and completely submersible, However, please ensure that the battery compartment
and probe gasket "ng are firmly pantened b before Comer in water. The waranty does not
How to obtain warranty performance: Include with the product your name, address, phone
number, description of the problem, and proof of date of purchase (receipt, invoice, etc.) and
return to:
HM Digital, Inc.
ATTN: Returns
5819 Uplander Way
Culver City, CA 90230
* If a returned product does not include the abovementioned items, the
Company reserves the right to refuse warranty service.
Implied Warranties: Any implied warranties, including implied warranties of merchantability and
fitness for a particular purpose, are limited in duration to five years from date of purchase. Some
states do not allow limitations on how long an implied warranty lasts, so the above limitation may
not apply to you. To the extent any provision of this warranty is prohibited by federal and state
law and cannot be preempted, it shall not be applicable. This warranty gives you specific legal
rights, and you may also have other rights, which vary from state to state.
NOTE: Warranties are product-specific. Third-party products and products deemed by HM Digital
as "accessories" are not covered under warranty. Third-party products include, but are not limited
to, batteries and fittings. Accessories include, but are not limited to, lanyards and product boxes.
This manual and all information contained herein copyright HM Digital, Inc. The contents of this
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7 PH-200 08/10
Changing the Batteries = ) pH
CONTENTS When the meter displays a flashing battery symbol, your batteries co
are getting weak and should be replaced soon. To change the batteries: | H H |
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Contact Information...…........…......…rssssenrsseerencan sacre nas 000 eue 1 1. Twist open the battery compartment on the top of the meter. .
Specifications.............-.....e—er=—..e=esríreccrrirnerer ree AA 1 2. Remove the three batteries.
Housing and Screen Description..............—..—.—..e.—r._.e.e_.rree.. 2 3. Insert new batteries in the direction as depicted inside the
Taking Measurements.................e—e———e.—ee_eeevereronereeceore en. 3 compartment. The meter uses battery size 357A. mire
Calibration.............—e.—.......e.reeccrerecreerere reee 4 4, Close and tighten the battery compartment to maintain waterproofness. = +
Care, Maintenance 4 Techniques.......................... mm... 5 co
VE senc eenss een sa na nee nan een 7 NOTE: Do not reverse the polarity of the batteries. This may short circuit the meter.
OVERVIEW Cleaning and Sensor Care
Thank you for purchasing HM Digital's PH-200 Meter. The PH-200 is an advanced, micro
processor based handheld, watertight pH meter with superior accuracy. It can be used for testing
the acidity or alkalinity of almost any liquid, in a wide variety of applications, provided the liquid
contains less than 50% alcohol and a conductivity of at least 10 uS (5 ppm in TDS). (It may not
be stable in pure, distilled or de-ionized water.) The PH-200 also measures temperature in both
Celsius and Fahrenheit. The meter incorporates automatic temperature compensation (ATC) to
accommodate for discrepancies in temperature that would naturally occur. The meter also
features digital calibration for easy and precise calibration that will yield better results.
If you have any problems or questions regarding your meter, please contact HM Digital, Inc.
[email protected]
HM Digital, Inc.
5819 Uplander Way
Culver City, CA 90230
pH Range: 0.00 — 14.0 pH
Temperature Range: 0-80 °C; 32-176 °F
pH: 0.01 pH
Temperature: 0.1 °C/F
Accuracy: +/- 0.02 pH
Temperature Compensation: Automatic (ATC) to 25°C (ATC range: 1-50°C)
Calibration: Auto-calibration to 4, 7 or 10 pH with fine tune digital calibration by push button.
Auto Shut-Off: After 5 minutes
Probe: Glass sensor and glass reference tube (single junction)
Safe Operating Temperature: 0-80 °C; 32-176 °F (measuring in extreme temperatures is not
Minimum Conductivity: For accurate and stable readings, the liquid to be tested must have a
conductivity of at least 10 uS (approx, 5 ppm in TDS).
Display: LCD panel
Housing: Waterproof (submersible); floats
Power source: 3 x 1.5V button cell batteries (included), model 357A
Battery Life: Approx. 100 hours of usage
Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)
Weight: 95 grams (3.35 ounces)
1. Never touch the glass electrode or reference tube!
2. To clean the body, use a soft rag or towel. Wipe with water and a mild soap or rubbing alcohol.
3. To clean the electrode (glass bulb) rinse in distilled water or a pH 7 buffer solution. If cleaning
with a pH 7 buffer, lightly dab (touch) the sensor on a soft tissue after. Never rub the electrode
with any type of material, as this may scratch the glass.
4. If the glass electrode is scratched or broken, it must be replaced.
5. There is a gel encased in the electrode. If this is dried, you can attempt to re-moisten it by
keeping it in a pH 7 solution for at least two hours. If the meter still does not function properly or
accuracy is not at optimum performance, the sensor may be irreparably damaged.
6. For best results, clean the sensor after each use, |
liquids, or liquids other than water. If testing liquid that is not clear, clean in distilled water.
7. SENSOR STORAGE: HM Digital's electrode storage solution is preferred. The meter is shipped
with this solution in the cap, and a small extra bottle. Additional solution (OP-STOR) can be
purchased. It is okay to rinse the sensor in distilled water, but never store it in distilled water.
Sensor Replacement
If your sensor has been damaged, you can purchase a new one without having to purchase a new
meter. The part number is SP-P2, To replace the sensor.
1. Remove the sensor gasket ring by twisting counter-clockwise.
2. Gently pull the sensor off the unit.
3. Gently insert the new sensor into the unit. Be sure to align the grooves properly. Never force
the sensor into the unit!.
4, Make sure the rubber gasket o-ring is properly positioned on the sensor.
5. Screw the orange gasket ring back onto the unit by twisting it clockwise. Hand tighten.
6. Reset to the factory default and calibrate to pH 7.0 (see pages 4 and 5).
Sponge Care
1. Never add distilled or tap water to the sponge/cotton ball, as mildew or mold may form.
2. Rewet with HM Digital's storage solution (OP-STOR).
Message Symbols and Troubleshooting
You will see the corresponding message symbol(s) with the issues listed below:
The sensor has been disconnected Á -.- Err
The electrode is broken, damaged or old À
The TDS level of the water is less than 3 ppm
The pH level is below 0 or greater than 14 -
There is intemal damage Err
The meter cannot calibrate --— Err
The temperature is out of range Err
6 PH-200 08/10
The PH-200 can take measurements of pH levels and temperature.
pH Measurements
. Remove the cap.
. Click the ON/OFF button. The display will activate.
. Dip the meter into the water sample, liquid or solution to be tested,
Lightly swirl the meter to ensure the removal of trapped air bubbles or electric charges.
Do not tap it against the glass.
. The meter will display a reading almost immediately. Keep the meter in the
an Bum
liquid until the reading stabilizes (approx. 5-30 seconds) for an accurate
reading. NOTE - Minor fluctuations are a normal function of pH in
certain environmental situations.
6. To view the reading out of the liquid, click the HOLD button while the meter (Es)
is in the liquid. This will freeze the reading on the screen. Clicking the
HOLD button again will release it.
, Click the ON/OFF button to turn the meter off, Yo.)
. Shake any excess water off the meter. For best results, rinse with distilled
or deionized water after each usage and wipe with a tissue. Put the cap
back on. Store the meter standing upright to ensure complete saturation of the sensor.
NOTE - The PH-200 is extremely sensitive in low conductivity water (below 50 uS). It is not
recommended to use this meter in water below 10 yS. If you do use the meter in such water,
it is better to test in flowing water, or by swirling the meter continuously while obtaining the
reading. The reading should stabilize in 30-45 seconds.
Temperature Measurements
The temperature reading is always displayed on the LCD panel during measurement mode,
and is shown simultaneously for pH readings. It is not shown when the meter is in calibration
mode. The default reading for the meter is in Celsius.
. Remove the cap.
. Click the ON/OFF button. The display will activate.
. The temperature reading is always displayed on the LCD screen (except in calibration and
reset mode), and can be used to take air or liquid temperature measurements.
‚ To measure the temperature of a water sample or solution, dip the meter into it. The
temperature reading will change immediately (unless the liquid is at room temperature). For
very hot or cold liquids, the reading may take slightly longer to stablize.
. Click the ON/OFF button to turn the meter off.
. Shake any excess water off the meter and rinse with distilled or deionized water. Wipe the
outside of the sensor dry with a soft tissue and put the cap back on.
+= Lo hy =
ay Cn
NOTE - Because of the sensitivity of the pH sensor and reference tube, it is not recommended
to use your meter as a thermometer in very hot or very cold liquids. Do not keep the meter in
very hot or cold liquids for extended periods of time.
Switching Temperature Modes
The default temperature reading is in Celsius. To change the temperature mode, click the
TEMP/CAL button to switch from Celsius to Fahrenheit or from Fahrenheit to Celsius.
Automatic Calibration
1. Turn the meter on by clicking the ON/OFF button. Note that
2. Insert the meter into a pH buffer solution of 4.0, 7.0 or 10.0.
3. The temperature reading will change to a flashing ‘CAL’
5. Change the reading so that it matches the value of the
Your PH-200 has been factory calibrated to pH 7.0. While this is suitable for many applications, it
is recommended to recalibrate the meter as close as possible to the pH level that will be tested,
and recalibrating prior to every test will provide superior results (though this is not required). The
PH-200 should be recalibrated at least once per month. If tests are conducted between wide
ranges, calibration should be done more frequently. Additionally, it should be noted that liquid pH
buffer accuracy may vary. For best results, use HM Digital's pH buffers (model PH-BUF).
The PH=200 features digital auto-calibration to pH 4.0, 7.0 or 10.0 and digital manual calibration to
any value within the meter's range. Manual calibration can also be used as “fine tuning.” For
example, if calibrating to 10,01, it is recommended to use auto-calibration to 10.00, and then
manual calibration to 10.01. NOTE - If calibrating to 10 after the meter was calibrated to 4 (or
vice-versa), it is recommended to calibrate to 7 first, prior to calibrating to the next value. Also, if
you are having trouble calibrating to 4 or 10, calibrate fo 7 first, then 4 or 10.
the reading will fluctuate if the meter is not submersed in a AM |
liquid (it will stabilize in liquid). LIL (| Meshine
Press and hold the CAL button for 5 seconds.
image for 10 seconds. Do not press any buttons. Г a Г indicates
4, The meter will automatically recognize the solution it is in (or L L T progress
the closest to it). This number will flash and the letters of
‘CAL will flash as 'C...CA...CAL indicating progress. Allow 5 indicates
= 60 seconds during this stage. Do not press any buttons E x d — completion
and do not move the meter.
5. When the meter is calibrated, ‘End’ will flash briefly and the screen will revert to measure-
ment mode. Your meter is now recalibrated.
Manual Calibration (Fine Tuning)
1. Turn the meter on by clicking the ON/OFF button,
2. Insert the meter into a known pH buffer solution,
3. Press and hold the CAL button for 5 seconds.
4, The temperature will change to a flashing ‘CAL image for 10
seconds before entering automatic calibration. During this H ! С
time, click either the UP button (TEMP/CAL) or DOWN . {
button (HOLD) to remain in manual calibration mode.
calibration solution. To increase the reading, click the UP rm
button and to decrease the reading click the DOWN button. L L —— flashing
Press and hold either button for rapid advancement.
- If the calibration reading reaches the minimum or ; a
maximum offset from the buffer value (approx. +/~- 3.3 - = <= min. cal bration
pH), the screen will display the ‘minimum calibration В
reached’ icon or ‘maximum calibration reached’ icon, - - + max, calibration
respectively. (e.g., if the meter is in a 7.0 solution, the reached
highest it can be calibrated to is 10.3.)
6. To set the calibration, click the ON/OFF button once. ‘C...CA...CAL will flash briefly,
followed by ‘End’ and the temperature will return to the screen. Your meter is now
NOTE - the sensor is very sensitive. It is normal for the reading to shift by .01 or .02.
4 PH-200 08/10
As with all pH meters, the PH-200 requires proper maintenance to ensure a healthy lifespan.
General Techniques
1. Store the meter upright (standing on the cap, so that you can read the text).
2. Do not store the meter in high temperature or direct sunlight.
3. Never touch the glass sensor! Skin oils may adversely affect the reading. If you do touch the
sensor, rinse immediately in a pH 7 buffer solution and soak in the solution for 2 hours.
4, Always immediately replace the cap when the meter is not in use. The PH-200 cap contains a
small wetted sponge or cotton ball to ensure that the gel within the glass sensor does not dry
up. NOTE - A tightened cap will ensure a longer lifespan for your sensor!
9. It is normal for salt deposits to form on the outside of the cap or rim of the cap. This is from the
storage solution contained within the cap, which is very high in NaCl concentration. If salt
deposits appear, simply wipe off with a soft tissue or rubbing alcohol.
6. Using the PH-200 in high temperature liquid, such as hot coffee or spas, will shorten the
lifespan of the sensor. If testing in hot liquid is essential, be sure to not keep the meter in the
hot liquid for an extended period of time. (Room temperature coffee will not affect the sensor.)
7. After repeated usage in high TDS liquids, it is advised to rinse the sensor in distilled water to
prevent residue build-up.
8. If testing two samples over a wide range (e.g., pH 4 and pH 10), make sure to rinse the sensor
in distilled water or a pH 7 buffer solution between and after tests.
9. For optimum performance, it is best to use the meter at least once per month,
For Best Measurement Results
1. Though it is not necessary , the PH-200 will be more accurate if calibrated before each use.
2. Rinse the sensor in distilled water or a pH 7 buffer solution after each test.
3. If an air bubble is lodged in the sensor, dip the meter in distilled water and stir, Remove the
meter and shake any excess water off. Wipe the outside of the sensor dry with a soft tissue.
4. If the glass sensor is scratched, it must be replaced.
5, If the readings seem to slow down, or the meter has become unresponsive or sluggish, you
may need to change the batteries or replace the snesor. Lifespans of sensors are limited and
vary depending upon usage. It is normal for a sensor to wear out.
FOR ADVANCED USERS ONLY - Resetting to the factory default. Follow these steps only if:
A. You have replaced the sensor.
B. Your meter has been used to continuously check widely varying pH levels,
C. You find your meter is not working at optimum performance.
To reset to the default pH settings:
1. Tum on the meter in the air with the cap off (do not submerge in a liquid for this process).
2, Press and hold the HOLD button for 10 seconds.
3. ‘End’ will briefly appear. Release the HOLD button. Turn the meter off.
4. Recalibrate to pH 7.0 (see page 4).
9. Turn the meter off again. Your meter has been reset to the factory default settings.
Calibrating the temperature (only do this if the temperature is incorrect):
1. You must have a correct thermometer next to the PH-200. Double-check the temperature first.
2. With the PH-200 off and the cap off and the meter in the air, press and hold ON/OFF and
TEMP/CAL for 5 seconds. The meter will enter temperature calibration mode.
3. Adjust to the correct temperature by pressing the UP or DOWN buttons.
4, Once correct, click the ON/OFF button. The temperature will flash and the screen will display a
flashing C...CA...CAL.
5. The screen will briefly display ‘End’ and then revert to measurement mode. The temperature is
now calibrated.
Battery compartment
LCD display
Button panel
Power button
Calibration mode, temperature
mode, calibration-up button GT
Lanyard hook A
Hold, calibration-down button 4
Sensor gasket ring
Detachable sensor (electrode)
ON 9npon-
LCD Display
Low battery indicator 1 — A pH
Warning symbol
pH measurement 3 gm i
Temperature measurement { .
Celsius/Fahrenheit mode
Hold mode (HOLD ff pl
1. The meter is shipped with the cap on tight to ensure proper condition of the electrode, which
must remain wet. You will notice that there is liquid in the translucent cap (an electrode storage
solution). Be careful not to spill it. To remove the cap, hold the meter and twist the cap off,
2. For new meters, for your first few tests, lightly swirl the meter in the water or solution you are
testing 3 times and allow the meter to sit while adjusting to the reading.
3. If you need to test the pH of low conductivity/TDS water (below 50 14S/25 ppm), you should do
so only after using the meter a few times in a pH buffer solution or higher conductivity water.
4. Never touch the glass sensor or reference tube with your fingers. Be sure not to hit the sensor
or reference tube against a glass or beaker, to avoid cracking it.
5, Always make sure that the cap is on tight after usage.
2 PH-200 08/70
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