OHAUS ST Series Pen Meter Instruction Manual
- June 14, 2024
- Ohaus
Table of Contents
OHAUS ST Series Pen Meter
Thank you for choosing OHAUS waterproof pen meters. Please read the manual completely before use. This manual serves the following models:
- ST10R (pen ORP meter)
- ST20R (pen ORP meter)
Product Information
The ST Series Pen Meter is a portable electrochemistry product that provides accurate measurement of pH, ORP, conductivity, TDS, and salinity. It is an economical option for users who are looking for meters that are easy to use and provide accurate measurements. The pen meters should not be used by children aged 12 or younger.
Specifications
Model| Description| Replaceable Electrodes| Cond. Range| Resolution| Accuracy|
Battery| Dimension| Weight| Auto-off| Ambient Temperature| Materials
---|---|---|---|---|---|---|---|---|---|---|---
ST10R| Waterproof pen ORP meter| Electrode R10 ST| -1000~+1000 mV| 1 mV| NA| 4
x 1.5V| 185x42x37mm| 105g| Yes| ABS
ST20R| Waterproof pen ORP meter| Electrode R20 ST| -1000~+1000 mV| 1 mV| NA|
N/A| ABS
Product Usage Instructions
Preparation
Before using the ST Series Pen Meter, make sure to:
- Insert the required batteries into the meter.
- Ensure that the electrode is properly connected and securely attached to the meter.
- Check if the electrode needs to be replaced or cleaned before use.
Powering On
To power on the ST Series Pen Meter, press the power button located on the
device. The meter will display the current measurement mode.
Selecting Measurement Mode
The ST Series Pen Meter allows you to select different measurement modes
such as pH, ORP, conductivity, TDS, and salinity. To select a specific mode,
use the mode selection button on the device. The selected mode will be
displayed on the screen.
Taking Measurements
To take measurements using the ST Series Pen Meter, follow these steps:
- Dip the electrode into the liquid sample you want to measure.
- Wait for a stable reading to appear on the screen.
- Record the measurement displayed on the screen.
- Rinse the electrode with clean water after each measurement to ensure accurate results.
Powering Off
To power off the ST Series Pen Meter, press and hold the power button until the device turns off.
FAQ
- Q: Can the electrode be replaced?
A: Yes, the electrode on the ST Series Pen Meter is replaceable.
After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in a line of portable electrochemistry products that providesaccurate measurement of pH, ORP, conductivity, TDS and salinity. ST series pen meters are an economical option when you are simply looking for meters that are easy to use and provide accurate measurements. The pen meters should not be used by Children of age 12 or younger.
First Usage
Condition the ORP electrodes by immersing it in ORP electrode protection solution for 1 hour before using. If the ORP electrode protection cap is dry (may cause white crystals), add storage solution in the cap and soak the ORP electrode for 1 hour.
ORP Measurement
Remove the protection cap, rinse the ORP electrode glass bulb with pure water
(distilled water), and wipe clean. (Glass bulb is fragile, be careful, do not
scratch it.)
- Press button On/Off turn on the meter.
- Dip the electrode about 2 to 3cm into the test solution(at least 20ml). Stir and wait until the reading stabilized.
- Clean the electrode with pure water after measurement.
- When measurement, you can press the button-Hold to freeze the reading, press the button-Hold again to release the measurement again.
- Press and hold button On/Off to turn off the meter.
Check
You can check if the ORP electrode (ST10R/ST20R) is good, you can use the standard potential solution to check it.
- Test Pen Standard Potential (25℃)
- 86mV±15mV (add excess Quinhydrone Chinhydron in pH 7.00 buffer to have saturated solution.)
- 265mV±15mV（add excess Quinhydrone Chinhydron in pH 4.00 buffer to have saturated solution.)
- The difference between 7.00 and 4.01 should be ≥ 165mV
- If the check result is not good, should clean the ORP electrode then check again; or purchase a new one.
Maintenance
Clean the electrode after test and cover the protection cap, be sure storage
solution is not dry in the cap. Harsh samples may short the pen meter life
time, such as sticky, dirty or oily liquids. The meter use button battery 1.5V
(AA)*4 , replace all the batteries when the display fade or not turn on
.
The electrode is replaceable.
Order Information
| Model | Description |
|---|---|
| ST10R | waterproof pen ORP meter |
| ST20R | waterproof pen ORP meter |
Replaceable electrodes:
- Electrode R10 ST
- Electrode R20 ST
Specification
| Water Proof Pen Meters | ST10R | ST20R |
|---|---|---|
| Cond. range | -1000~ +1000 mV | -1000~ +1000 mV |
| Resolution | 1 mV | 1 mV |
| Accuracy | NA | 0.0~99.9 °C |
| Battery | 4 x 1.5V | 4 x 1.5V |
| Dimension | 185x42x37mm | 185x42x37mm |
| Weight | 105g | 105g |
| Auto-off | After 6 min no operation | After 6 min no operation |
| Ambient temperature | 0~50 °C(32-122°F) | 0~50 °C(32-122°F) |
| Materials | ABS | ABS |
In conformance with the European Directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE) this device may not be disposed of in domestic waste. This also applies to countries outside the EU, per their specic requirements. Please dispose of this product in accordance with local regulations at the collecting point specified for electrical and electronic equipment. If you have any questions, please contact the responsible authority or the distributor from which you purchased this device. Should this device be passed on to other parties (for private or professional use), the content of this regulation must also be related. Disposal instructions in Europe are available online at europe.ohaus.com/europe/en/home/support/weee.aspx. Thank you for your contribution to environmental protection. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna, increase the separation between the equipment and receiver or consult the dealer or an experienced radio/TV technician for help.
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