Alpha TDS 190 Total Dissolved Solids Controller / Transmitter

  • Warranty This device is covered by a 1 year warranty
  • Selelctable Temperature coeffcient Ensures higher TDS accuracy
Product Options


RS Hydro are UK distributors of the Eutech produced Alpha TDS 190 controller/transmitter, if you require a reliable and straightforward controller/transmitter that measures from pure water to electroplating rinse tank water this is the ideal device for you. This device measures up to ±1% full scale accuracy across eight TDS ranges with selectable temperature coefficient for higher TDS accuracy at temperatures ranging from -10 to 110°C. Temperature compensation can be selected in either automatic or manual depending on the application and user preference. The addition to this a three wire sysetm compensates errors due to cable resistance to ensure the most accurate results.

Two SPDT relays allow high/low set-points limit control , each one of theses relays come with their independent hystersis to prevent relay chattering.

User friendly features of the Alpha TDS 190 are direct access to set point adjustment and calibration menu, while the controller freezes data transmission and relay activites during calibration and maintenance. One of the best features of this meter is the varied input from 85 to 250 VAC. 50/60 Hz or DC which enables a wide range of supply voltages for use in any environment.

This meter is covered by a 1 year meter warranty.

Manufactured by: Eutech Instruments
Model: Alpha TDS 190 Total Dissolved Solids Controller / Transmitter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


TDS 190
Ideal for drinking water, monitoring and control, hydroponics and aquaponic solution balance and control, pools and spa hardness and salinity control


Range ... to 10.00 ppm ; ... to 100.0 ppm ;
... to 1000 ppm ; ... to 5.00 ppt ;
... to 10.00 ppt ; ... to 100.0 ppt
Resolution 0.01 ppm ; 0.1 ppm ;
1 ppm ; 0.01 ppt ;
0.1 ppt
Cell Constant 0.1 ; 1 ; 10
Relative Accuracy ±1 % of full scale
Range -10 to 110 °C
Resolution 0.1 °C
Accuracy ±0.5 °C
Sensor Pt100; 2 or 3 wire
Compensation Auto/manual (0 to 50 °C)
Coefficient 0.0 to 5.0 %
Normalisation 10.0 °C to 30.0 °C
Factor 0.40 to 1.0
Set Point And Controller Functions
Set Point 1 (SP1)/
set Point 2 (SP2)
... to 10.00 ppm or ... to 100.0 ppm or
... to 1000 ppm or ... to 5.00 ppt or
... to 10.00 ppt or ... to 100.0 ppt
Switching Conductivity Hysteresis 0 to 10 % of full scale
Switching TDS Hysteresis 0 to 10 % of full scale
Function Limit control
Contact Outputs 2 SPDT relays
Switching Voltage/
Max. 250 VAC / max. 3 A / max. 600 VA
Electrical Data and Connections
Transmitter Function 4 to 20 mA scalable outputs for Conductivity, galvanically isolated
Load 200 Ohm
Conductivity/TDS Input 2-pin terminal
Connection Terminal 3-pin, 7-pin & 9-pin terminal, detachable blocks, 1 fixed connector
LED 7 segments display
Power Supply
Input 85 to 250 VAC, 50/60 Hz
Main Fuse 250 mA, anti-surge, S504 Bussman
Rated Input Current (Max.) 100 mA
Insulation Category II
EMC Specifications
Emitted Interference According to EN 61326
Immunity To Interference According to EN 61326
Environmental Conditions
Operating Temperature Range -10 to 50 °C
Max. Relative Humidity 10 to 95 % (non-condensing)
Mechanical Specifications
Dimensions (WxHxD) 96 x 48 x 150 mm
Weight 300 g (unit) / 350 g (packed)
Ingress Protection IP50



TDS is only relevant in freshwater systems as salinity will dramatically increase the conductivity and therefore apparent TDS.