Technical Specifications

Setpoint Repeatability：≤0.5% F.S.

Hysteresis Adjustment Range：0.5% ~ 100% F.S., independently adjustable per relay channel

Switch Response Delay：0.1s ~ 10s software adjustable; suppresses false triggers from liquid turbulence and pump start-stop surges

Control Modes：Upper/lower limit hysteresis mode; independently configurable for both relay channels

Relay Output Configuration：2 sets of independent SPDT relays (NO / NC / COM per channel)

Maximum Switching Capacity per Relay：5A @ 250VAC / 5A @ 30VDC, resistive load; drives contactors and solenoid valves directly

Contact Arc Suppression：Built-in RC absorption circuit; reduces contact arcing and extends service life

Analog Output Type：4-20mA, 2-wire loop compatible

Analog Output Linearity Error：≤0.2% F.S.

Zero Temperature Drift：±0.05% F.S./℃ (within full compensated temperature range)

Sensitivity Temperature Drift：±0.05% F.S./℃ (within full compensated temperature range)

Long-term Stability：≤0.2% F.S./year; maintains consistent control thresholds year-round

Relay Mechanical Lifespan：≥100,000 operations at full load; ≥1,000,000 operations at light load

On-site Calibration：Zero reset and span fine-tuning via head keypad; no need to retrieve the probe for routine adjustment

Parameter Protection：Password lock function prevents unauthorized or accidental parameter modification

Output Short-circuit Protection：Full protection for both analog output and relay coil circuit

Reverse Polarity Protection：Full power supply reverse tolerance; no internal circuit damage with reversed wiring