... PHG-200 transmitter is for online continuous detection of the solution's acid, alkalinity. It's applicable for chemical , ... anti interference, fast response. Patented pH probe, inner reference solution is promote by 250KPa pressure, extremely slow exudation. So ... resistance4-20mA, 0-600ΩRs485(Modbus/RTU)Power supplyDC24V (12.5-48V)Resistance of reference electrode≤ 10KΩTemperature compensationAuto, 0 ...