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Further Information
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Combined pH and Conductivity Meters
430 Enterprise Conductivity/pH Meter
• Simultaneous display of pH, conductivity and temperature
• Automatic or manual calibration
• Combined pH, conductivity and temperature probe
• Power on self check routine
• Auto-selecting ranges for both TDS and conductivity modes
The easy to use 430 is designed to readily withstand the rigours of field work, while reliably measuring pH and conductivity. The unit allows the simultaneous readout of pH, conductivity or TDS and temperature with switched ranges for both conductivity and TDS measurements.
3540 Bench Combined Conductivity/pH Meter
• Simultaneous display of pH and conductivity
• 2 independent channels to prevent interference between probes
• Additional modes for resistivity, salinity, TDS and mV
• Data logger with auto save/print options
• Storage of up to 500 readings (250 for each mode)
The 3540 is ideal for use in all laboratories where pH and conductivity analyses are required. The setup menu gives quick and easy access to the whole range of instrument, pH and conductivity measurement options. Calibration of both channels is automatic, with the option to select 1, 2 or 3 calibration points. The pH channel can also display mV values if required.
Technical Specification
| Parameter | 430 | 3540 |
| pH range | 0.00 to 14.00 (1 or 2 point calibration) | –2.000 to 20.000 |
| pH resolution | 0.01 | 0.001/0.01/0.1 |
| pH accuracy | ±0.02 | ±0.003 |
| Auto. buffer recognition | 4.00, 7.00, 9.22, 10.00 | Jenway, NIST, DIN and JIS |
| mV range | – | ±1999.9mV |
| mV resolution | – | 0.1mV |
| mV accuracy | – | ±0.2mV |
| Conductivity ranges | 5 auto–selected from 0 to 199.9mS | Auto–selected from 0.01µS to 1.999S |
| Conductivity resolution | 0.01µS to 0.1mS | 0.01µS to 1mS |
| Conductivity accuracy | ±0.5% ±2 digits | ±0.5% ±2 digits |
| Cell constant | 0.01 to 19.99 | 0.010 to 19.999 |
| Automatic standard recognition | 10µS, 84µS, 1413µS, 12.88mS (with manual override) | 10µS, 84µS, 1413µS, 12.88mS (with manual override) |
| TDS range | 5 auto–selected from 0 to 199.9g/l | 6 auto–selected from 0 to 1999g/l |
| TDS resolution | 0.01mg/l to 0.1g/l | 0.01mg/l to 1g/l |
| TDS accuracy | ±0.5% ±2 digits | ±0.5% ±2 digits |
| EC ratio (TDS) | 0.50 to 0.80 | 0.50 to 0.80 |
| Temperature range | –9.9 to 99.9°C | –10 to 105°C |
| Temperature resolution | 0.1°C | 0.1°C |
| Temperature accuracy | ±0.5°C | ±0.5°C |
| ATC and manual | 0 to 99.9°C | 0 to 100°C |
| Temperature coefficient | 0.00 to 4.00%/°C | 0.00 to 4.00%/°C |
| Reference temperature | 18, 20 or 25°C | 18, 20, 25°C |
| Additional modes | – | Salinity and resistivity |
| GLP | – | Calibration reminder interval, operator and sample ID and security coded setup |
| Outputs | – | Analogue, RS232 and IrDA interface |
| Connector | mini–DIN | BNC (pH) and 7–pin DIN (conductivity) |
| Power | 2 AA batteries | 9V AC ±10% @ 50/60Hz |
| Size (l x w x d) | 175 x 75 x 35mm | 210 x 250 x 55mm |
| Weight | 250g | 850g |
Ordering Information
| Part Code | Description |
| 430 271 | 430 conductivitypH meter supplied with combined pHconductivity probe (430 231), buffer sachets, batteries (fitted) and free carry case |
| 354 001 | 3540 conductivitypH meter supplied with glass combination pH electrode (924 005), glass conductivity probe (K1, 027 013), electrode stand and holder, ATC probe (027 500), BNC shorting plug, pH buffers and UK power supply |
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