pH Meter Data Logger ST 404SD
- Real time SD memory card Data logger, it Built-in Clock and Calendar, sampling time set from 1 sec to 8 hour 59 min. 59 sec.
- Manual data logger is available (set the sampling time to 0), during execute the manual data logger function, it can set the different position (location) No. (Position 1 to position 99).
- Innovation and easy operation, computer is not need to setup extra software, after execute data logger, just take away the SD card from the meter and plug in the SD card into the computer, it can down load the all the measured value with the time information (year/month/date/hour /minute /second) to the Excel directly, then user can make the further data or graphic analysis by themselves.
- SD card capacity: 1 GB to 16 GB.
- LCD with green light backlight, easy reading.
- Can default auto power off or manual power off.
- Power by UM3/AA (1.5 V) x 6 batteries or DC 9V adapter.
- Wide applications: water conditioning, aquariums, beverage, fish hatcheries, food processing, photography, laboratory, paper industry, plating industry, quality control, school & college, water conditioning.
Specification :
Real time data recorder, save the data into the SD memory card and can be download to the
Excel, extra software is no need.
pH: 0 to 14.00 pH.
mV (ORP): -1999 mV to 1999 mV.
Manual temperature compensation.
ATC (automatically temperature compensation) via optional Temp.
Auto calibration for pH 7.0, pH 4.0 and pH 10.0.
Operating humidity: Less than 85% R.H.
Operating temperature: 0 to 50 ℃.
Data hold, Record (Max., Min.).
RS232/USB computer interface.
Power Supply:
A Alkaline or heavy duty DC 1.5 V battery ( UM3, AA ) x 6 PCs, or equivalent.
Power Current:
Normal operation ( w/o SD card save data and LCD Backlight is OFF) : Approx. DC 14 mA.
When SD card save the data and LCD Backlight is OFF) : Approx. DC 37 mA.
If LCD backlight on, the power consumption will increase Approx. DC 12 mA.
Dimension: 177 x 68 x 45 mm (7.0 x 2.7x 1.9 inch)
Weight: 489 g/1.08 LB.
Patent: Germany Nr. 20 2008 016 337.4
Continuous, Audit-Ready pH Monitoring with the pH Meter Data Logger ST 404SD
Capture, store, and analyze pH data over time with the pH Meter Data Logger ST 404SD—a high-precision, benchtop instrument engineered for environmental monitoring, pharmaceutical validation, food safety, wastewater treatment, and research applications. Combining ±0.002 pH accuracy, automatic temperature compensation, and built-in SD card data logging, the ST 404SD delivers reliable, time-stamped records without requiring a PC or cloud connection—ideal for compliance, trending, and unattended operation.
Engineered for Traceable, Long-Term pH Recording
The ST 404SD pH Meter Data Logger measures pH from 0.000 to 14.000 with 0.001 pH resolution and supports 1–5 point automatic calibration using standard buffers. Its integrated Pt1000 temperature sensor enables real-time Automatic Temperature Compensation (ATC), ensuring accuracy across 0–100°C. All readings—including pH, temperature, date, time, and calibration status—are automatically saved to a removable microSD card (up to 32 GB) in CSV format, ready for direct import into Excel, LIMS, or reporting software.
- High Accuracy: ±0.002 pH | Resolution: 0.001 pH – Suitable for GLP/GMP and regulatory workflows.
- SD Card Data Logging (Up to 100,000+ Points) – Continuous or interval-based recording (1 sec to 24 hrs).
- CSV File Output – No Proprietary Software Needed – Open data directly in Excel or analysis tools.
- Automatic Calibration & Electrode Diagnostics – Tracks slope, offset, and response time for quality assurance.
- Benchtop Design with Electrode Stand – Stable setup for long-duration monitoring (e.g., fermentation, stability studies).
- Programmable Alarms & Event Markers – Flag out-of-spec conditions or manual annotations during logging.
Trusted for Compliance and Process Validation
From validating buffer stability in cleanrooms to monitoring effluent discharge or tracking pH drift in bioreactors, the ST 404SD ensures full data traceability for FDA 21 CFR Part 11, ISO 17025, HACCP, and EPA requirements. Its standalone operation eliminates reliance on computers, making it perfect for incubators, cold rooms, or remote sampling stations.
Whether you’re conducting a 72-hour corrosion study or ensuring batch consistency in beverage production, the pH Meter Data Logger ST 404SD provides the accuracy, autonomy, and audit-ready documentation your processes demand.
Log with confidence. Prove compliance. Never miss a data point.
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