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HM Digital Controllers
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HM Digital PS-203 Dual Display TDS Controller
The HM Digital PS-203 dual display TDS controller continuously monitors and controls total dissolved solids (TDS) on two water lines simultaneously. Designed for high-output commercial water systems, it lets you monitor feed water and product water with separate displays, independent relay controls and user-adjustable alarms.
Two-line TDS monitoring and control
Monitor and control two water lines simultaneously, such as feed water and product water.
Read each line on a large, bright, four-digit LED/FND display.
Set control levels using the on-screen up/down buttons.
Use independent dry-contact relays to control a pump, solenoid valve or other device.
Configure an optional steady-beep alarm for each set point when TDS rises above the user-set level.
Includes two 1/2-inch NPTF sensor probes with shielded cable.
Technical specifications
Model
PS-203
Measurement range
0–9999 ppm
Accuracy
±2%
Conversion factor
NaCl, average 0.5
Resolution
0.1 ppm from 0–99.9 ppm; 1 ppm from 100–9999 ppm
Automatic temperature compensation (ATC)
Yes, 1–60°C
Calibration
Digital calibration using up/down push buttons
Control settings
On-screen up/down buttons
Relay operation
Each independent relay opens or closes a circuit via dry contacts when its sensor's ppm reading reaches or exceeds the control setting.
Relay switching rating
5 A, 250 VAC
Alarm
Optional user-set steady beep, one for each set point
Probes
Two 1/2-inch NPTF sensor probes
Cable length
3 m (9.8 ft), shielded cable
Display
Dual bright four-digit FND displays
Power source
AC 110 V/230 V, +10% VAC; 50/60 Hz
Monitor dimensions
9.6 × 9.6 × 12.6 cm (3.78 × 3.78 × 4.96 in.)
Monitor weight
476 g (1 lb 0.8 oz)
Frequently asked questions
What does the PS-203 monitor?
The PS-203 monitors total dissolved solids on two water lines at the same time, such as the feed water and product water lines of a high-output commercial system.
Can it control a pump or solenoid valve?
Yes. Each sensor has an independent dry-contact relay that opens or closes a circuit when the reading reaches or exceeds its control setting. The listed relay switching rating is 5 A at 250 VAC.
Are sensor probes included?
Yes. Two 1/2-inch NPTF sensor probes are included. The listed shielded cable length is 3 m (9.8 ft).
Does it have an alarm for each water line?
Yes. Each set point has an optional user-configured steady-beep alarm.
