The 121pH is an online panel-mounted pH indicator by Countronics with a large 0.8″ red LED display, auto temperature compensation via PT100, and front-panel digital calibration. It is a display-only instrument with no relay or control output.
The 121pH displays pH only — no relay or control output. A pH controller like the 112pH includes relay outputs for dosing pump automation. Choose 121pH for monitoring only; choose 112pH when automatic dosing control is required.
Yes. The 121pH includes automatic temperature compensation using an external PT100 sensor, ensuring accurate pH readings regardless of liquid temperature — essential for reliable industrial pH monitoring.
No. The 121pH has no 4-20mA output. For pH indication with isolated 4-20mA transmitter output for SCADA or PLC integration, choose the 122pH model.
Calibrated digitally from the front panel using pH 7 and pH 4 buffer solutions. Two-point calibration requires no tools or software — just the buffer solutions and a PT100 temperature sensor.
Used in water treatment, ETP, pharmaceutical manufacturing, food and beverage, swimming pools, and chemical plants — any application requiring continuous online pH monitoring without automatic control.
Manufactured by Countronics, ISO 9001:2015 certified, established 1978, Ghaziabad, India. Direct factory pricing, pan-India delivery. Contact: +91-9810536887.
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| Display | 3½ Digit Red, 0.8” character height LED display |
|---|---|
| Range | 0.00 to 14.00 pH |
| Auto Temp | 0-100˚C using PT100 ext. sensor compensation |
| Calibration | Standard pH-7 : 7.00 ± 1 |
| Accuracy | 0.5% ± 1 Digit |
| Input Impedance | >1012 Ω |
| Supply | 220V AC ±10% @ 50/60Hz |
| Size | Front facia – 96mm x 96mm x 40mm |
| Enclosure | Plastic ABS |
| Weight | 700gms |
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