The Model 3540 Combination
Conductivity / pH Meter
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The Model 3540 is ideal for use in water testing applications and in all laboratories where pH and conductivity analysis is required. It offers a space saving and flexible approach to the measurement of these two parameters. The bright back lit LCD has five separate tabbed screens, each accessed with the simple navigation keys. The set-up menu gives quick and easy access to the wide range of instrument, pH and conductivity measurement options.

The conductivity channel has a special ultra-pure water function which enables the temperature compensation algorithm for this exacting application. Other modes of operation enable Resistivity, Salinity and TDS measurement. The pH channel can also display mV values to 0.1mV resolution, enabling ORP/Redox measurements to be made.

The built in data logger can store up to 250 pH and conductivity readings based on manual or automatically timed triggers, as well as from stability and alarm status. Logged results can either be sent to the internal memory or via the RS232 serial port to the optional printer. A newly launched DataWay PC software program is useful for data acquisition. Data can be automatically or manually logged and displayed in both tabular and graphical form.

The comprehensive GLP functions include calibration reminders and status tracking, operator and sample ID management and a supervisor security code for all set-up options.

Calibration of both the pH and conductivity channels is automatic, with the option to select 1, 2 or 3 calibration points for each. Automatically recognized pH buffers conforming to the NIST, DIN and JIS standards can be overridden by manually entered values, as can the 4 automatically recognized conductivity standards. An option to calibrate the conductivity channel to a cell constant is also included for quick and simple conductivity measurements.

Model 3540 Specifications

pH Range	-2.000 to 20.000pH
Resolution	0.001 / 0.01 / 0.1pH selectable
Accuracy	±0.003pH
mV Range (Abs & Rel)	0 to ±1999.9mV
Resolution	0.1mV
Accuracy	±0.2mV
Input impedance	>10¹²ohms
Calibration	1, 2 or 3 point
Auto buffer recognition	Jenway, NIST, DIN, JIS
Manual buffer recognition	Any value entered within the range
Conductivity Range	Auto ranging from 0.01µS to 1.999S (19.99S with x10 probe)
Resolution	0.01µS to 1mS (0.01S with x10 probe)
Accuracy	±0.5%; ± 2 digits
Calibration	1, 2 or 3 points
Auto standard recognition	10µS, 84µS, 1413µS, 12.88mS
Manual standard recognition	Any value entered within the range or by cell constant value (K factor)
Reference temperature	18, 20 or 25°C
Temperature coefficient	0 (off) to 4%/°C
Temperature ranges	-10 to +105°C / 14 to 221°F
Resolution	0.1°C / 1°F
Accuracy	±0.5°C / ±1°F
MTC/ATC ranges	0 to 100°C / 32 to 212°F
Outputs	RS232 serial, analogue and alarms
Clock	Time (24 hour) and date
Memory	250 readings (pH with conductivity)
Data logging	Timed, stability and alarm level triggers with output to internal memory or printer/computer
GLP	Calibration reminder (1 to 999 hours) / Operator and Sample ID / Security code protection for set-up
Display	Back lit 1/8 VGA LCD
Power	9Vac from 230/110V mains adapter
Size	210x250x55mm
Weight	850g
Warranty	2 Years parts and labor

Model 3540 Order Codes

354 001	Model 3540 pH/conductivity meter supplied with glass combination pH electrode (924 005), glass conductivity probe with ATC K=1 (027 013)electrode holder, ATC probe (027 500), pH 4, 7 and 10 buffer sachets, UK power supply, BNC shorting plug (009 146), and operating instructions
354 101	Model 3540 pH/conductivity meter supplied with glass combination pH electrode (924 005), glass conductivity probe with ATC K=1 (027 013)electrode holder, ATC probe (027 500), pH 4, 7 and 10 buffer sachets, US power supply, BNC shorting plug (009 146), and operating instructions
354 201	Model 3540 pH/conductivity meter supplied with glass combination pH electrode (924 005), glass conductivity probe with ATC K=1 (027 013)electrode holder, ATC probe (027 500), pH 4, 7 and 10 buffer sachets, European power supply, BNC shorting plug (009 146), and operating instructions
354 301	Model 3540 pH/conductivity meter supplied with glass combination pH electrode (924 005), glass conductivity probe with ATC K=1 (027 013)electrode holder, ATC probe (027 500), pH 4, 7 and 10 buffer sachets, 230V leaded power supply, BNC shorting plug (009 146), and operating instructions
Combination pH electrode has a built in reference electrode. combination pH electrode = (Reference Electrode + Measuring electrode) in one body

Accessories

924 005	Glass bodied combination electrode
027 113	Conductivity cell with ATC, glass K=0.1
027 177	Conductivity cell with ATC, glass K=1, flow-through
027 211	Conductivity cell with ATC, epoxy K=0.1
027 212	Conductivity cell with ATC, epoxy K=1
027 213	Conductivity cell with ATC, epoxy K=10
027 013	Conductivity cell with ATC, glass K=1
027 500	ATC/temperature probe
025 179	pH 4 buffer sachets (ready to use( (pack 10)
025 180	pH 7 buffer sachets (ready to use) (pack 10)
025 181	pH 10 buffer sachets (ready to use) (pack 10)
025 037	pH 4 colored buffer solution (red) (500ml)
025 038	pH 7 colored buffer solution (yellow) (500ml)
025 039	pH 10 colored buffer solution (blue) (500ml)
025 162	pH 9.22 buffer solution (500ml)
025 163	pH 2 buffer solution (500ml)
025 160	3M KCl electrode fill solution
025 161	pH electrode cleaning solution (pH)
025 192	pH electrode storage solution
025 157	Redox standard (200mV) (500ml)
025 158	Redox standard (300mV) (500ml)
025 159	Redox standard (465mV) (500ml)
025 139	Conductivity calibration standard 10µS (500ml)
025 164	Conductivity calibration standard 84µS (500ml)
025 138	Conductivity calibration standard 1413µS (500ml)
025 156	Conductivity calibration standard 12.88mS (500ml)
025 265	TDS calibration standard 1382ppm (500ml)
037 701	Thermal printer supplied with roll of paper and universal power adapter
037 702	Paper roll for thermal printer
037 801	9 way serial cable
037 901	Bench stirrer (battery operated)
903 300	Electrode stand and holder
903 311	Extended length electrode rod for 903 300 (recommended for use with the battery stirrer)
060 406	Dust cover
021 030	UK 230V power supply
021 031	European 230V power supply
021 032	US 115V power supply
021 033	230V leaded power supply
050 501	DataWay Software on CD-ROM includes electrochemistry interface cable (013 203) & spectrophotometer interface cable (013 210)