Online Conductivity TDS Salinity Controller Water Quality Monitor
4-20mA RS485 Transmitter
>>Overview
The industrial online conductivity meter is a microprocessor-based
water quality online monitoring and control instrument. This device
is widely used across various industries including power plants,
petrochemicals, metallurgy and electronics, mining, paper
manufacturing, semiconductors, pharmaceuticals, food and beverage
production, environmental water treatment, and modern agricultural
cultivation. It is suitable for applications such as softened
water, raw water, steam condensate, distilled seawater, and
deionized water systems. The instrument enables continuous
monitoring and control of key parameters including conductivity,
resistivity, TDS (Total Dissolved Solids), salinity, and
temperature in aqueous solutions.
>>Features
• Dot-matrix LCD display
• Smart menu operation
• Multiple automatic calibration functions
• Versatile signal output options, 4-20mA, RS485
• Data recording & curve display
• Differential signal measurement mode for stable and reliable performance
• Manual/automatic temperature compensation
• Relay control switches
• High/low limits with hysteresis control
• Simultaneous display of main Parameter, temperature, and status on the same interface
• Password protection to prevent unauthorized operation
>>Technical Parameter
Controller Type | 98*98cm black and white version | 98*98cm colorful version | 144*144cm black and white version | 144*144cm colorful version |
Measurement Range (depends on electrode) | Conductivity: 0-500mS/cm; TDS:0～250g/L; Salinity: 0-700PPT; 0～70%; 0～700g/L； Temperature: -10~150.0 °C; |
| Resolution | Conductivity: 0.01 μ S/cm; 0.01mS/cm; TDS:0.01mg/L； 0.01g/L; Salinity: 0.01PPT; 0.1%； 0.01mg/L; Temperature: 0.1 °C; |
| Basic Error | ±1%F.S Temperature: ±0.3°C |
| Stability | ±0.2%F.S/24h |
| Current Output | 0/4-20 mA (load resistance <750 Ω) 20-4 mA (load resistance <750 Ω) (1 channel standard, 2 channels optional) | 0/4-20 mA (load resistance <750 Ω) 20-4 mA (load resistance <750 Ω) |
| Communication Output | RS485 MODBUS RTU |
Dual Relay Control Contacts | 2Sets 3A 250V AC, 3A 30V DC | 3Sets 5A 250V AC, 3A 30V DC |
| Power Supply (optional) | 85-265 VAC ±10%, 50±1 Hz, ≤3W 9-36 VDC, ≤3W |
| Historical Data | NO | NO | Yes | Yes |
| Data Trend Chart | NO | NO | NO | Yes |
| Dimensions | 98 × 98 × 130 mm | 144 × 144 × 118 mm |
| Installation | Panel-mounted or wall-mounted, Panel cutout: 92.5 × 92.5 mm | Panel-mounted or wall-mounted, Panel cutout: 137 × 137 mm |
| Protection Rating | IP65 |
| Weight | 0.6 kg | 0.8 kg |
Operating Environment | Temperature: -10 to 60°C Humidity: ≤90% RH No strong magnetic interference except Earth’s natural field |
