INTRODUCTION Thank you for purchasing our PC 700 series benchtop meter. This microprocessor-based meter is economical and simple to use. The design incorporates a large LCD for clear viewing, yet offers a small footprint to conserve space. The PC 700 measures pH, mV (ORP), conductivity, or TDS simultaneously with temperature (ºC or ºF).
GETTING STARTED 2.1 Keypad Functions Powers the meter on and off. Upon power on, the meter automatically begins in the mode that was last used. Calibration and memory values are retained even if meter is unplugged. Toggle between available measurement modes— pH/Temp, mV/Temp, Conductivity/Temp, or TDS/Temp.
CONDUCTIVITY ELECTRODE The PC 700 includes an electrode with a nominal cell constant of k = 1.0, built-in temperature sensor, and 1 meter cable. The Ultem body housing has good chemical resistant properties. The electrode design offers fast temperature response and reduces air entrapment, ensuring accurate, repeatable, and stable readings.
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USA buffer group 1.68, 4.01, 7.00, 10.01, 12.45 ST buffer group 1.68, 4.01, 6.86, 9.18, 12.4 See Section 9.6 to change th e buffer group 1) Press as needed to select pH. Dip the pH and ATC electrodes into pH buffer and press .
Note: When an offset has been stored successfully, R.mV replac CONDUCTIVITY AND TDS CALIBRATION 5.1 Automatic or Manual Calibration The PC 700 is capable of automatic or manual calibration for conductivity, and manual calibration for TDS. In the automatic calibration mode, the meter will automatically se...
If you only use calibration standards that are listed in TABLE 1, automatic calibration is recommended. If you intend to calibrate with one or more standards that are not l isted in TABLE 1, the PC 700 must be set for manual calibration i nstead.
Rinse or immerse the probe before calibration and between samples with clean water (deionized water is ideal). The PC 700 has non-volatile memor y which will retain all calibration values, as well as meter settings and memory values upon meter shut down or unexpected power loss.
When the READY indicator appears, press to accept. The primary reading will flash briefly before returning to measuremen mode upon successful calibration. 5.5 Manual Conductivity & TDS Calibration Procedure Press as needed to select conductivity (μS or mS) or TDS (ppm or ppt) calibration.
Erroneous results will occur while the probe guard is removed. 6.2 Automatic and Manual Ranging The PC 700 automatically selects the optimum range in which your readings appear. Refer to TABLE 1 for a list of the available ranges. To turn-off automatic ranging, press .
STORING AND RECALLING DATA The PC 700 can retain up to 100 data points into memory for later retrieval. 1) In the measurement mode, press to insert the measured value into memory.
SETUP FUNCTIONS Use the setup feature to customize your instrument operation. First, select the appropriate measurement mode you wish to adjust by pressing until the desired units are displayed (i.e. pH, mV, Conductivity, or TDS). During measurement, press and hold for 5 seconds to enter SETUP mode of the parameter being measured.
The tem erature oefficient is th e amount of change in conductivity per degree temperature (% per ºC). The PC 700 is factory set to a temperature coefficient of 2.1 % per ºC. For most applications t his will provide good results. The meter allows adjustment from 0.0 to 10.0.
Press to confirm. 9.13 3.8 CELL ( Cell Constant)—Con & TDS only The PC 700 includes a probe with a nominal cell constant (k) of 1.0. Use prob es with = 0.1 and 10 (sold se parately) for improved performa ce in extreme sample ranges. Use this setup function to change the cell constant if necessary.
9.14 4.0 rSt (Reset) Press Press to select “Yes” (Reset) or “No” (Cancel). If “Yes”, pres to select “Cal” (calibration reset only) or “FCt” (compl ete reset to factory default settings). Press to confirm. 9.15 5.0 CLr (Clear Mem ry) Press Press to select “Yes”...
CALCULATING TDS CONVERSION FACTOR You can calibrate TDS using the value of the calibration standard solution at a standard temperature such as 25 ºC. To determine the conductivity- to-TDS conversion factor use the following formula: Factor = Actual TDS ÷ Actual Conductivity @ 25 ºC ...
CALCULATING TEMPERATURE COEFFICIENTS To determine the temperature coefficient of your sample solution use this formula: Where: tc = Temperature coefficient 25 = 25 ºC = Conductivity at Temp 1 = Conductivity at Temp 2 T1 = Temp 1 T2 = Temp 2 NOTE: A controlled temperature water bath is ideal for this procedure.
REPLACEMENTS AND ACCESSORIES Part number Ordering Code Item Description Eutech Oakton Instruments Instruments PC 700 with pH electrode (ECFC7252101B / 59001- ECPC70043S 70), conductivity/temp electrode (CONSEN9501D / 35413-00 01X543601 35608-74), integral stand,100/240 VAC PC 700 with integral stand, 100/240 VAC...
TROUBLESHOOTING GUIDE PROBLEM CAUSE SOLUTION No display Main power not switched Switch on the power supply. on. AC Adapter socket not Re-insert AC Adapter. inserted properly. “Ur” (Under Measured value is out Check electrode is connected. range) of range. Clean or replace electrode. Electrode not connected.
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Calibration error. Use fresh buffer solutions. Buffer value does not Check electrode connection. match displayed value or Clean & recondition electrode. electrode is disconnected Replace electrode. or failing. Unstable pH Broken or worn electrode Replace electrode reading External ‘noises’ or Remove or switch off interfering induction (electrical ‘noise’...
SPECIFICATIONS pH Range 0.00 to 14.00 pH Resolution 0.01 pH 0.01 pH + 1 count Accuracy Calibration Points Up to 5 points with Auto-buffer recognition USA : pH 1.68, 4.01, 7.00, 10.01,12.45 Buffer Options NIST: pH 1.68, 4.01, 6.86, 9.18 ,12.45 Slope Display Yes (with offset) ...
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Cell Constant 0.1, 1.0, 10.0 (selectable) TDS Factor 0.40 to 1.00 (adjustable) Automatic (4 points); Maximum 1 per range Calibration points Manual (5 points); Maximum 1 per range Auto-ranging Hold Function Memory 100 data sets Input BNC, 8-pin DIN Power AC/DC 9V, 6W Adapter (100/240 VAC, 50-60Hz) Dimensions (mm) meter only = 175 (L) x 155 (W) x 69 (H)
If repair or adjustment is necessary and has not been the result of abuse or misuse within the designated period, please return – freight prepaid – and correction will be made without charge. Eutech Instruments/Oakton Instruments will determine if the product problem is due to deviations or customer misuse.
Eutech Instruments will not be responsible for damage resulting from careless or insufficient packing. A restocking charge will be made on all unauthorized returns. NOTE: Eutech Instruments Pte Ltd /Oakton Instruments reserve the right to make improvements in design, construction, and appearance of products without notice.