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Reed SD-230 pH/ORP Meter/Logger

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The SD-230 ORP and pH meter is a Reed real time datalogger with memory card slot. It features a large, easy-to-read LCD display and simple push-button operation. A powerful custom microprocessor LSI circuit and its last generation electronics allow the unit to provide features such as a pH range which is from 0 to 14.00pH. Reed SD-230 can measures and records the values of measurements for a later analysis with a computer. The gage has a good configurable sampling time, from 1 second to 3600 seconds and is compatible with any pH Electrode with a BNC connector. An easy to read LCD display with backlight shows the humidity and temperature simultaneously

REED SD-230 Features

  • Meter can select between ATC or manual temperature adjustment
  • Three Point Calibration
  • Accepts any pH Electrode with a BNC connector
  • Real time SD memory card datalogger with a built-in clock and
  • Sampling time set from 1 second to 3600 seconds
  • Meter can switch to a Manual Datalogging
  • No extra software needed, just plug the SD card into the computer
    and it downloads directly to EXCEL
  • SD card capacity: 1 GB to 16 GB
  • Easy to read LCD with backlight
  • Auto power off or manual power off
  • Data hold, record max. and min. reading
  • High accuracy microcomputer circuit
  • Power by UM3/AA (1.5 V) x 6 batteries
  • USB/RS232 Computer interface

Authorised Australian Distributor

1 Year Warranty


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SKU: Reed SD-230 Category: Tags: , ,

How to use Reed SD-230 pH and ORP Meter

pH Measurements (Manual Temp. Compensation)
Turn on this data logger by pressing the Power Button and connect the Optional pH Electrode into the pH/BNC SD-230’s socket. Before taking measurements you need to Set the pH Manual Temperature Compensation value. Press and hold the SET Button for 2 seconds to enter the “Advanced Setting” mode. Press the Next Button scroll through eight main functions, shown on the lower display until the “t-Set” icon appear. When the lower display shows “t-SEt “, use the Up or Down Buttons to select the upper value to the desired Temperature Compensation value. The default value is 25°C (77°F). Press the Enter Button to save the setting as the default. Now you can exit “Advanced Settings” by pressing the Esc Button.
Hold the Electrode Handle and let the Sensing head get fully immersed the measured solution. Shake the pH Electrode to let the probe’s internal air bubble drift out from the sensing head. The top display will show the pH value and the bottom display will show the setting for the Manual Temperature Compensation value.

pH Measurements (ATC)
For pH measurements you need to plug in the optional Temperature Probe into the Temperature Socket. Plug in the optional pH Electrode into the pH/BNC Socket. Immerse both the Temperature Probe and the pH Electrode into the measured solution. Shake the pH Electrode to let the probe’s internal air bubble drift out from the sensing head. The top display will show the pH value and the bottom display will show the measured Temperature.

mV Measurements
This instrument comes with an built in mV (millivolt) measurement function. This feature enables you to make ion-selective, ORP (oxidation-reduction potential), and other precise mV measurements. All of these measurements are easy to made and start when you will push down the “function button” so the unit switches from “pH” to “mV”. To return to pH measurements, press the Function Button again. Connect the optional ORP Electrode Plug into the pH/BNC Socket. 3) The Display will show the mV value.

How to use Data hold and Data record functions
You can hold on the measured values any time while taking a measurement by pressing the Hold Button once. Press the Hold Button once again will release the data hold function. To record the maximum and minimum pH or ORP readings, press the REC Button once, and a ”REC. MAX.” symbol along with the maximum value will appear on the display. Press the REC Button again, and a “REC. MIN.” symbol along with the minimum value will appear on the display.


pH Ranges 0.00pH to 14.00pH
Resolution 0.01pH
Accuracy ±(0.02pH of reading + 2 digits)
mV Range -1999mV to +1999mV
Resolution 1mV
Accuracy ±(0.05% of full scale + 2 digits)
Sampling Time Auto, 1, 2, 5, 10, 30, 60, 120, 300, 600, 1800, 3600 seconds
Memory Card SD memory card, 1GB to 16GB

General Specifications

Power Supply Six (6) type ‘AA’ 1.5-Volt Alkaline Batteries
Dimensions 177mm (L) x 68mm (W) x 45mm (D)
Weight 489g
Ordering Information
Reed SD-230 pH – ORP Meter/Data Logger
Reed PE-01 pH Electrode
Reed PE-03 pH Electrode
Reed PE-11 pH Electrode
Reed ORP-14 ORP Electrode
Reed PH-04 4.0 pH Buffer Solution
Reed PH-07 7.0 pH Buffer Solution
Reed TP-07 ATC Temperature Probe
Reed BS-6 Tripod
Reed CA-05A Soft Carrying Case
Reed SD-2GB 2GB SD Memory Card
Reed USB-01 USB Cable
Reed UPCB-01 RS-232 Cable
Reed SW-U801-WIN Data Acquisition Software
Reed CERTIPH1 Accredited Calibration Certificate



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