ELMETRON CX-461 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The ELMETRON CX-461 is a waterproof multifunction meter designed for precise and easy-to-use measurements across various parameters in diverse environments. This device is suitable for both field and laboratory work, offering high accuracy and repeatability of readings.

Function Description:

The CX-461 measures:

Hydrogen ion concentration (pH): In pH units.
Redox potential (mV): In mV.
Conductivity: In µS/cm or mS/cm.
Dissolved oxygen in water: In % of saturation or mg/l.
Oxygen content in air: In %.
Atmospheric pressure: In hPa.
Temperature: In °C, °F, or K.

The meter can also display conductivity measurement results in concentration units (g/l or %) converted to NaCl, KCl, or TDS (total dissolved solids).

Important Technical Specifications:

pH Measurement:
- Range: -2.000 to 16.000 pH
- Resolution: 0.001 / 0.01 pH
- Accuracy: ±0.002 pH (±1 digit)
- Input Impedance: >10^12 Ω
- Temperature Compensation: Manual/Automatic
- Compensation Range: -5.0 to 110.0 °C
- pH Electrode Calibration: Automatic, 1 to 5 points
- pH Buffer Recognition Range:
  - Point 1: 0.800 ÷ 2.100
  - Point 2: 3.900 ÷ 4.100
  - Point 3: 6.800 ÷ 7.100
  - Point 4: 8.900 ÷ 10.200
  - Point 5: 11.800 ÷ 14.000
- Automatic pH buffer value change with temperature (NIST norm) in range 0 ÷ 60 °C.
- Thermal Stability of Zero: 0.001 pH/°C
mV Measurement:
- Range: -2000.0 to 2000.0 mV
- Resolution: 0.1 mV
- Accuracy: ±0.1 mV (±1 digit)
- Input Impedance: >10^12 Ω
Conductivity Measurement:
- Ranges and Resolutions:
  - 0.000 ÷ 19.999 µS/cm: 0.001 / 0.01 µS/cm (Accuracy: ±0.1 %, Frequency: 100 Hz)
  - 20.00 ÷ 199.99 µS/cm: 0.01 / 0.1 µS/cm (Accuracy: ±0.1 %, Frequency: 1 kHz)
  - 200.0 ÷ 1999.9 µS/cm: 0.1 / 1 µS/cm (Accuracy: ±0.1 %, Frequency: 2 kHz)
  - 2.000 ÷ 19.999 mS/cm: 0.001 / 0.01 mS/cm (Accuracy: ±0.1 %, Frequency: 5 kHz)
  - 20.00 ÷ 199.99 mS/cm: 0.01 / 0.1 mS/cm (Accuracy: ±0.25 %, Frequency: 10 kHz)
  - 200.0 ÷ 2000.0 mS/cm: 0.1 / 1 mS/cm (Accuracy: ±0.25 %, Frequency: 10 kHz)
- Temperature Compensation: Manual/Automatic
- Compensation Range: -5.0 ÷ 70.0 °C
- K Constant Range: 0.010 ÷ 20.000 cm⁻¹
- α Coefficient Range: 0.00 ÷ 10.00 %/°C
- TDS Coefficient Range: 0.20 ÷ 1.00
- Measurement with conversion to KCl: 0 ÷ 200 g/l
- Measurement with conversion to NaCl: 0 ÷ 250 g/l
- Cell Calibration: 1-point, by introducing K constant or using standard solution.
Dissolved Oxygen Measurement:
- Ranges and Resolutions:
  - 0 ÷ 600.0 %: 0.1 % (Accuracy: of the cell* ±1 digit)
  - 0 ÷ 60.00 mg/l: 0.01 mg/l (Accuracy: of the cell* ±1 digit)
- Temperature Compensation Range: 0.0 ÷ 40.0 °C
- Salinity Compensation Range: 0.0 ÷ 50.0 g/l
- Atmospheric Pressure Measurement: 800 ÷ 1100 hPa
- Sensor Calibration: 2 points (0% and 100% O₂) or 1 point (100% O₂)
- Dissolved Oxygen Sensor: Membrane, galvanic
Atmospheric Pressure Measurement:
- Range: 800 ÷ 1100 hPa
- Resolution: 1 hPa
- Accuracy: ±2 hPa (±1 digit)
- Pressure Sensor: HP03S
Temperature Measurement:
- Range: -50.0 ÷ 200.0 °C
- Resolution: 0.1 °C
- Accuracy: ±0.1 °C (±1 digit) for the meter.
- Temperature Probe: Pt-1000 platinum resistor
- Probe Accuracy (0 ÷ 100 °C):
  - Pt1000B resistor: ±0.8 °C
  - Pt1000 1/3B resistor: ±0.27 °C
Other:
- Memory Capacity: 2000 results, divided into 1 ÷ 10 banks.
- Operating Temperature: -5 ÷ 45 °C
- Power Supply: AA NiMH rechargeable battery x 2, 6V/500mA stabilized power adapter.
- Power Consumption: 70 mW (0% brightness), 180 mW (100% brightness), max. 2.4 W (recharging batteries).
- Display: LCD 55 x 45 mm
- Dimensions: 149 x 82 x 22 mm
- Weight: 260 g (with rechargeable battery)

Usage Features:

Simultaneous Multi-Parameter Display: The large backlit custom LCD can display readouts of four different measurement functions simultaneously.
Touchscreen Keyboard: Facilitates comfortable operation.
Waterproof Housing: Enables working in difficult conditions.
Automatic and Manual Temperature Compensation: The meter automatically switches to automatic compensation when a temperature probe is connected, displaying a specific symbol. When disconnected, it enters manual compensation mode, indicated by a different symbol, and uses a user-set temperature value.
pH Electrode Calibration: Supports 1 to 5 points with automatic recognition of pH buffers and standards. User-defined buffer values can be entered. The meter provides information about pH electrode condition (white for efficient, yellow for efficiency loss/expired calibration, red for erased characteristic).
Conductivity Measurement: Features seven automatically switched subranges (autorange). It can convert conductivity to salinity (NaCl or KCl) and TDS, with the option to introduce a TDS coefficient. Calibration can be done by introducing the K constant or using standard solutions.
Dissolved Oxygen Measurement: Automatically compensates for salinity influence (using measured salinity values) and atmospheric pressure influence (via a built-in sensor) for mg/l readings.
Data Storage: Stores measurement results with time, date, and temperature, either as single readings or series with a set time interval. Memory is non-volatile.
PC Cooperation: Equipped with an RS-232 output (USB with an additional adapter) for sending recorded data or current results to a PC. Special software is provided for data transmission and collecting measurement series.
Real-Time Clock with Date: Ensures accurate time and date stamping of measurements.
Automatic Switch-Off: User-settable time for automatic power-off during non-use, extending battery life. Deactivated during calibration, series collection, or when connected to a power adapter.
Electrode/Sensor Management: Stores characteristics for up to three electrodes/sensors for each function, allowing quick replacement without recalibration. The color of the electrode number indicates its condition (white: efficient, valid calibration; yellow: efficiency loss or expired calibration; red: characteristic erased, calibration needed).
Calibration Validity: Allows setting a calibration validity expiry date, with a yellow electrode number signaling expiry.
Error Signaling: Triple warning sound for wrong value entry, unrecognized standards during calibration, or attempts to turn off the meter during series collection.

Maintenance Features:

pH Electrode Preparation: Requires conditioning in saturated KCl solution, removal of protective rings before measurement, washing in distilled water after each use, and storage in saturated KCl solution. Specific instructions are provided for refilling electrolyte and handling electrodes with protective bottles.
Conductivity Cell Maintenance: Advises soaking the cell in distilled water before use, especially for distilled water measurements. Emphasizes washing the cell with distilled water and avoiding mechanical cleaning of platinum electrodes to prevent damage. Provides cleaning solutions for oil and heavy sediment contamination. Proper immersion to avoid air bubbles is crucial for accurate results.
Dissolved Oxygen Sensor Maintenance: Requires regular conservation, including replacing membranes and electrolyte, and cleaning electrodes. Neglecting these activities will make measurements impossible. Stable measurements require natural or simulated water flow. Long-term storage (over 2 months) necessitates removing the electrolyte and re-conditioning.
Battery Replacement: The meter uses 2 x R6 rechargeable batteries (AA). Instructions for replacing batteries include undoing screws, pulling out the container, inserting new batteries with correct polarity, and ensuring the sealing ring is properly seated to maintain waterproof integrity. Using non-rechargeable batteries with the power adapter can damage the meter.
Software Updates: Information about software version and manufacturer contact details are available in the INFO tab.