HM Digital HydroMaster HM-500 User manual
USER’S GUIDE
HydroMaster
HM-500
TABLE OF CONTENTS
1. INTRODUCTION ..................................................................................... 2
A. Overview ................................................................................................. 2
B. What’s Included ....................................................................................... 2
C. Housing Description ................................................................................. 2
D. Specification ............................................................................................ 3
E. LCD Display ............................................................................................ 4
F. Switch and Keypad Controls ...................................................................... 4
G. Icon Description ...................................................................................... 5
2. pH CALIBRATION, CARE & MAINTENANCE .................................... 6
A. pH Information & Maintenace .................................................................... 6
B. pH Operation ........................................................................................... 6
C. pH Calibration .......................................................................................... 7
3. EC/TDS CALIBRATION & MAINTENANCE ........................................ 8
A. EC/TDS Basic Information .......................................................................... 8
B. EC/TDS Maintenance ................................................................................. 9
C. EC/TDS Operation .................................................................................... 9
D. EC/TDS Calibration ................................................................................. 10
E. EC/TDS Temperature Reading Calibration ................................................... 12
4. DATA STORAGE ................................................................................... 13
A. Saving Your Readings ............................................................................. 13
B. Recalling Saved Readings ........................................................................ 13
A. Delete All Saved Data ............................................................................ 13
5. ALARM SETTINGS ............................................................................... 14
6. ALARM SOUND & DELAYING YOUR ALARM ............................... 15
7. ALARM SETTING DEFAULT VALUE DATA ....................................... 15
8. CLEARING SAVED DATA .................................................................... 16
9. BATTERY CHARGING INSTRUCTIONS ............................................ 16
10. WARRANTY ........................................................................................ 17
11. CONTACT INFORMATION ............................................................... 18
1
1. INTRDUCTION
A. Overview
Thank you for purchasing the HM-500 (HydroMaster), by HM Digital.
The HM-500 monitors pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS)
and temperature with very high accuracy. This instrument can be calibrated with
various buffer solutions, and is equipped with automatic buffer recognition for user
convenience. The touch-screen LCD makes it user-friendly, and features automatic
light detection making it easy to view in dark environments.
B. What’s Included
ㆍ1 HydroMaster Monitor
ㆍ1 Wall mount bracket
ㆍ1 EC/TDS/Temp Sensor
ㆍ1 PH Probe
ㆍ1 USB Power adapter & cable
ㆍ2 Sensor holding clips
ㆍ1 PH-STOR, PH-4, PH-7, C-1000ppm liquid packet
ㆍ1 User’s guide
C. Housing Description
Power Button
1.LCD
Alarm
Upper Stand
Lower Stand
EC/TDS Cable Insert
pH Cable Insert
USB Power Insert
Auto Backlit Sensor
2
D. Specifications
1. Measurement Range
• pH: 0.00 - 1pH 4.00
• Temperature: 0 - 55 °C / 32 - 130 °F
• TDS: 0 - 9999 ppm / 0 - 10.00 ppt
• EC: 0 - 9999 µS / 0 - 20.00 mS
2. Automatic Temperature Compensation Range (ATC)
• ATC: 0.0 - 60.0 °C
3. Accuracy
• pH: ± 0.1 pH
• Temp: ± 1 °C / ˚F
• EC/TDS: ± 2 %
4. Measurement Scales
• pH: pH
• Temp: °C / °F
• TDS: ppm & ppt (NaCl) 0.5 scale / ppm & ppt (442™) 0.7 scale
• EC: µS / mS
5. Resolution
• pH: 0.1 pH
• Temp: 0.1°C / 0.1 °F
• TDS: ppm: 0.1ppm (0 - 99.9ppm) / 1 ppm (100-999ppm) / 10ppm (1000-9990 ppm)
ppt: 0.01 ppt (0.01 - 10.00 ppt)
• EC: µS: 0.1 µS (0 - 99.9 µS) / 1 uS (100 - 999 µS) / 10µS (1000-9990 µS)
mS: 0.01 mS (0.01 - 20.00 mS)
6. Data Storage: Up to 20 readings
7. Auto Shut-Off: After 5 minutes (While in Battery mode)
8. Alarm: Adjustable Set Point (See section 5)
9. Power Source: AC 110 V - 240V / Rechargeable Lithium Ion Battery
10. Service Environment: 0 - 50 °C / RH 80 %
11. Display: LCD Touch Screen controls with Auto Backlit lighting
12. Probe: ABS with Electrodes Conductivity Sensor / Single Junction Ag/AgCl pH Sensor
13. Sensor Cable: 2m (80 inch) shielded and Coaxial Cable
14. Dimensions: Approx. 8 x 4 x 1.4 inches / 20 x 11 x 3.6 cm
15. Weight: 15.2 oz (0.43 Kg) for body / 5 oz (140 g) for two probes (without case)
3
E. LCD Screen Display
F. Switch and Keypad Controls
pH Readings
Temp Readings
EC/TDS Readings
Saved Data Numbers
Touch Screen Buttons
Touch 3 seconds to change from the home screen mode to menu.
Quick touch to save readings while in the home screen mode.
Touch for 3 seconds to recall saved data.
Touch for 3 seconds to turn off back light or touch to turn light on.
Also used to save device settings and both measurement calibrations.
Raises numeric values when adjusting settings or calibration.
Also moves selection cursor up when in menu mode.
Lowers numeric values when adjusting settings or calibration.
Also moves selection cursor down when in menu mode.
Exits to the main menu when in menu mode.
Also cancels settings or calibration.
Turns the power on/off. Also changes the EC/TDS scale being used.
4
G. Icon Description
5
Changes to menu mode from the home screen
Calibration Mode Indicator
Alarm setting indicator and for making corrections
Alarm Delay Indicator
pH meter sensor is unstable
Device needs maintenance
Out of range alarm indicator
Recalls saved data and measurement readings
Saving data
Device is in charging mode
Battery life indicator
NaCl and 442 Conversion factor indicators
High and low alarm indicator
Alarm out of range
Arrow cursors in Menu Mode
pH readings indicator
Temperature scale Indicators
EC scale indicators.
TDS scale indicators.
2. pH CALIBRATION, CARE & MAINTENANCE
A. pH Information & Maintenance
[The pH electrode included with the HydroMaster (HM-500) has been carefully
handcrafted. For optimal performance and probe longevity, carefully follow the
instructions below.]
• The life of a pH electrode will depend on how it is used and maintained.
(It is backed by a 6 month factory warranty)
• Inside the glass bulb of the pH sensor is a Potassium Chloride (KCl) solution.
It is also in the cap of the pH sensor.
After usage, always store the probe in the sensor cap. For long-term use,
purchase a KCl solution and use it for storage.
• Always keep the electrode wet. If the electrode dries it may shorten its life
and the pH reading may not be as accurate. If this is the case, immerse the
electrode in KCl storing solution for a minimum of 2 hours to re-saturate.
• Rinse the electrode with clean water or distilled water (if available) between
or after measurements to eliminate cross contamination of solutions.
[Warning]
• Avoid direct sunlight or heat.
• Do not touch the glass part of the electrode with your hands or hard
materials.
• Exposure to highly basic or acidic solutions, extremely high and/or low
temp water may cause damage to the electrode, thereby shorten its life.
• If the measuring time of the pH meter slows down or if the pH reading is
unstable, it’s most likely time to change the electrode.
• When wiping the electrode with a dry cloth, be careful of static electricity,
as it may delay pH readings.
B. pH Operation
1. The HM-500 is factory calibrated. However, we recommend initially
re-caibrating the instrument before 1st usage and then once a month
thereafter.
2. Remove the sensor cap. Be careful not to spill KCl storage solution from
the cap.
3. Immerse the electrode in the solution you would like to measure and stir
gently to remove air bubbles surrounding electrode. (Air bubbles can
affect accuracy of pH readings).
4. Measurements take between 10-60 seconds to stabilize.
6
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1. From HOME SCREEN, press and hold the [MENU] button
for 3 seconds to select [MENU] mode.
2. Once in [MENU] mode use the [DOWN] key, and select
“CAL”, then press [ENTER] key.
3. The CAL screen will appear “PH”, “C F” , and “EC”.
Select “PH” by pressing the [ENTER] key to enter pH
calibration mode.
4. The values“7.00”, “4.00”, “10.00”will appear on the screen.
Immerse the pH electrode in pH 7.00 buffer solution and
wait.
5. Move the cursor to “7.00” by using the [UP/DOWN] keys,
and touch [ENTER] to start pH 7.00 calibration.
6. After calibration has begun, “C..CA..CAL” will blink in this
order across the screen.
7. The word “End” will appear on the screen after 2-30 seconds
when calibration is complete. If there’s a problem with the
electrode “Err” will blink three times on the screen and will
automatically return to the pH calibration menu.
8. Once this is completed, repeat calibration for pH 4.00 or pH
10.00 following steps 1-5 (except select pH 4 or pH 10 in step 5).
[Warning]
• Calibration is required when replacing the electrode or after long-term
(inactive) storage to ensure accurate readings.
• Calibrate 1st to pH 7.00 then pH 4.00, or pH 10.00 buffer solutions, based
on your application.
C. pH Calibration
3. EC/TDS CALIBRATION & MAINTENANCE
A. EC/TDS Basic Information.
EC (Electrical Conductivity) and TDS (Total Dissolved Solids) are closely related.
TDS measures the concentration of dissolved solids within water or a nutrient
solution.
TDS is calculated by sending a charge in the water which measures the
electrical conductivity of that solution, and is then converted to TDS using the
following conversion factors:
[Conversion Factors]
• 442™ (or 0.7 Factor): developed by Myron L, to simulate natural water (river, lake,
or drinks). The 442™ is named after the three main ingredients of the solution:
40% sodium bicarbonate, 40% sodium sulfate, and 20% sodium chloride.
• NaCl (or 0.5 Factor): Stands for sodium chloride. This solution is widely used in
the Water Market.
EC (µS, mS) does not require the usage of a conversion factor – the factor is used
only when converting EC data to TDS.
[EC, TDS Available Mode]
The HM-500 includes the following scales and modes:
•Two different EC measuring scales: microsiemens (µS) and millisiemes (mS).
1000 µS equals 1 mS.
• Two different TDS measuring scales and modes: PPM (Parts Per Million) and
PPT (Parts Per Thousand), both available in 0.5 & 0.7 scale 1000 ppm equals
1 ppt.
[EC, TDS and Automatic Temperature Compensation (ATC)]
• Temperature plays an important role when measuring EC or TDS. If the temperature
of the calibration solution you’re using is higher than 25°C (77°F), the device will
read measurements that are higher than normal. In comparison, if the temperature
is lower than 25°C (77°F), the device will read measurements lower than normal.
Thus, the international standard measurement requires an EC or TDS reading at
25°C (77°F).
• Since maintaining temperature of the solution you are measuring at 25°C (77°F) can
be difficult, the HM-500 includes an Automatic Temperature Compensation (ATC)
function that converts the reading to reflect that of 25°C (77°F).
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B. EC/TDS Electrode Maintenance.
• Avoid direct sunlight or heat.
• Do not touch sensor pins of the electrode with your hands or sharp materials.
• Scratching electrodes will cause corrosion.
• To clean contaminated sensor, please use alcohol with a soft cloth to clean
and then rinse with clean water or distilled water (preferably). Gently shake
off excess water or blot-dry with dry cloth, and store probe with cap on.
• When reading the EC/TDS of different solutions, rinse the electrode with
water (preferably distilled) when necessary. REMEMBER: dirty sensors can
affect accuracy of future readings. Using the electrode the recommended
temperature range for use is 1-50°C (33.8-122°F).
[Warning]
• Higher Temps will damage the electrode.
• Do not use probe in rapidly changing temperatures - Will cause damage.
• Physical shock to probe may cause damage.
C. EC/TDS Operation.
1. To select the scale you would like to measure in (EC/TDS), press (single
touch) the [ON/OFF] button key on top of device (µS, mS, ppm .5 or .7, and
ppt .5 or .7. - The default scale setting(unit of measurement) when power
ing on the device is µS (micro siemens).
2. Immerse the sensor of the electrode in the solution you would like to test
and stir gently to remove air bubbles surrounding it.
3. Wait for the temperature to stabilize in order to obtain the most accurate
reading.
4. If would like to change between EC/TDS modes during operation. (see step 1)
5. Rinse electrode with clean (preferably distilled or RO) water between/or after
use for maximized accuracy and elimination of cross contamination solutions.
[Warning]
• When measuring for EC/TDS place the sensor at the center of the solution.
Placing sensor at the edge or bottom of the solution container may cause
inaccurate readings.
• We recommend using glassware (beaker/flask) to avoid electronic static
interference. The electrode is very sensitive to static electricity.
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