The KH102 four limit alarm instrument is suitable for precise measurement and alarm of physical quantities such as temperature, humidity, pressure, liquid level, gravity, instantaneous flow rate, vibration, vacuum degree, pH value, etc Input:K、T、J、PT100、4~20mA、0~5V (other) accuracy :  ±（0.2%FS+1） sampling period  :  ≤0.5S supply voltage:  AC85-240V Communication protocol: MODBUS