LMS water

The 520c Chemistry and Water Quality Monitor
is an easy to use and calibrate hand held battery operated multifunction water quality instrument with a clear digital display. The 520c can be fitted with individual electrodes suitable for field and laboratory use and supplied with manuals and an AC adaptor.

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Use the 520c to make simple, accurate measurements in the laboratory or in the field. This lightweight, portable unit is capable of accepting a wide selection of individual electrodes and gives an instantaneous display of values. The instrument includes a basic datalogging function and a continuous output facility to drive a printer. Automatic adjustment in calibration mode allows quick servicing and one touch operation of the keypad ensures that the 520c is a simple, cost-effective alternative which gives multifunctional capabilities in the palm of your hand.

With a choice of measuring pH, dissolved oxygen, conductivity/salinity/TDS, turbidity/TSS, temperature, flow or ion concentration in one versatile unit, you reduce the number of instruments needed for general laboratory applications. This means less bench and storage space is required, and a single instrument also reduces your training and maintenance needs.

Easy to operate
The 520c is quick and easy to use with the minimum of keystrokes needed to perform each function. At switch on, the instrument performs a self-test to ensure it is operating correctly. Simply connect your chosen electrode, select the parameter and measurements units via the keypad and the instrument is ready for operation.

Clear digital display
The LCD displays measured parameters, in a range of engineering units, simultaneously with temperature, battery status, calibration points; minimum, maximum and average readings are also shown. Dissolved oxygen is displayed as %saturation, mg/l or ppm; conductivity as l S, mS, ppm or ppt; turbidity as NTU or mg/l; temperature as ) C or ) F; flow as m/sec or ft/min and selective ions as ppm, ppt or mV. Units are selected on the keypad. Battery voltage can also be checked and a low battery condition is indicated automatically.

Simple calibration
Single key operation with pre-set calibration points makes calibration easy and reliable.

Rugged and portable
The 520c is lightweight and portable, making it comfortable to use. The tough, moulded ABS case is splashproof to IP54.

Dry cell or rechargeable batteries
Either dry cell or NiCad rechargeable batteries may be used. Alternatively the 520c may be connected to an external battery or ac adapter giving you a choice of power sources. To conserve battery life the 520c will optionally power down after 10 minutes if no action has occurred.

Location coding facility
Up to 50 data points, plus temperature can be stored together with a numeric site code to denote the location at which the measurements was made. The measurements can be recalled later, either on the display or for printout.

Analogue and RS232 outputs
Analogue and RS232 digital outputs mean you can output readings to a chart recorder or serial printer for hard copy records. You can print out readings automatically at pre-set intervals continuously.

Wide choice of compatible electrodes
A wide choice of compatible electrodes means you can tailor the 520c to your specific needs, allowing you to extend the scope of your instrument to meet your new requirements.


Range/ Resolution 0.00 to 14.00 pH ± 800mV (abs)
Accuracy (25°C) 0.01 pH 0.1 mV or 0.05 % rdg
Tempco 0.003 pH/°C 0.05 mV/°C

Conductivity/ Salinity/ TDS
0.1K 1.0K
Electrode 1101US 1103US
Range/ Resolution
Low 0.1 to 200.00 µS/cm 1.0 to 2000.0 µS/cm
5.0 to 10000 KV 0.5 to 1000.0 KV
High 0.050 to 10.000mS/cm 0.50 to 100.00mS/cm
0.100 to 20.000KV 0.010 to 2.000KV
0 to 1000 ppm 0.30 to 60.00 ppt (15°C)
Accuracy (25°C)
Low ±1% rdg ± 0.1 µS ±1% rdg ± 0.5 µS
High ±1% rdg ± 0.005 mS ±1% rdg ± 0.05 mS
±5ppm ±0.3ppt

Range/ Resolution 19 to 1560 ft/min
0.100 to 7.900 m/sec
Accuracy ±3%rdg

Dissolved Oxygen
Range/ Resolution 0.00 to 20.00ppm or mg/l, 0.0% to 200.0% Saturation
Accuracy (at T cal) ±0.2ppm or mg/l, ±2% Saturation
Temperature compensated
Accuracy ±0.3ppm, ±3% saturation (±10°C from T cal)
Temperature Range -8°C to 45°C
Compensation Keypad entry of salinity and barometric pressure

Ion Selective Electrodes (ISE)
Range/ Resolution 0.01 to 200.00ppm, 0.1 to 2000.0ppm
0.01 to 200.00ppt (keypad selectable)
Conformity ±2% of reading (maximum)
Accuracy Depends on ISE type

Turbidity/ TSS
Probe 1110TU
Range/ Resolution 0.2 to 100.0 NTU, 0.5 to 250 mg/l (silica)
50 to 4000 NTU, 125 to 10000 mg/l (silica)
Accuracy ±3%rdg, ±0.2 NTU (low range)
±3%rdg, ±20 NTU (high range)
Temperature range 0°C to 40°C

Sensor Platinum RTD (Pt100) DIN 43760, BS1904
Range/ Resolution -190°C to +600.0°C, -310.0°F to +1100.0°F
Accuracy ±0.15°C or ± 0.05%rdg (plus Pt100 error)
Conformity ±0.05°C, 0.1°F

Power Source Dry cell alkaline (3 x C cell, L14) or NiCad rechargeable batteries

Battery Life
Alkaline 200 hours at 20°C, NiCad (2Ah version): 50 hours at 20°C, depending on type of electrode

External Power AC adaptor via 2.1mm DC socket (centre ground). 7 - 16 V DC @50mA (typical). NiCad batteries charged externally.

Outputs ASCII RS232 digital output (9600 baud) for serial printer via 9-pin D shell socket, ±2V (1mV/digit) DC analogue output via 9-pin D shell socket. 2 channels: measurement plus temperature.

Site Code User-selectable two digit site code

Datalogging Manual: maximum 50 measurements plus temperature. Output to printer with option to review data on LCD. Selectable timed or continuous output to printer.

Operating Conditions -10°C to +50°C; 0 to 90% RH

Storage Conditions -20°C to +60°C; 0 to 95% RH

Case High impact strength moulded ABS case, sealed to IP54

Dimensions 75mm wide x 40mm depth increasing to 112mm wide x 65mm depth, 210mm length

Weight 590g with batteries