1.It is composed of PHG-7685A-1 measuring unit and electronic unit with microprocessor. It adopts microcontroller and Chinese operation for easy use.
2.The instrument is plate-type structure and divided into dry and wet parts for easy installation, operation and maintenance.
3.It can simultaneously display pH value (25℃)and temperature of measured water.
4.It can conduct compensation for temperature coefficient in pure water, ammonia containing water by selecting the isopotential point.
5.It has function of automatic positioning, slope calculation and automatic temperature compensation.
6.It has (4～20)mA photoelectric isolation output current. The upper limit and lower limit of corresponding pH value can be chosen within the two pH interval.
7.It has function of automatic alarming of upper limit and lower limit and power failure protection.
8.It has RS-232or RS-485 digital output port to realize digital output.
9.The unit case has the protection level of IP65 to prevent water spraying and dust pollution.
1.The measuring range:
pH：(0.00～14.00)pH
Temp: (-10.0～120.0)℃
2.The error range:
pH：±0.05pH±1 digit
Temp: ±0.5℃ [ (0～60.0)℃]；
±1.0℃ [ (-10.0～0.0)℃，(60.0～120.0)℃]
3.Stability of electronic unit: ±0.02pH/24h
4.Automatic temperature compensation of electronic unit：±0.01pH±1 digit
5.Output current error range of electronic unit：±1%FS
6.Repeatability：0.02pH
7.Measured water sample:
Temp: (0～60)℃
Flow rate：（80～100）ml/min
Pressure: （7～140）kPa
8.Consumption level of buffer: 50ml/min; capacity of buffer bottle: 400ml
9.Inlet connector of water sample: outer diameterΦ6×1, stainless steel or PVC hose.
10.Outlet connector of water sample: outer diameterΦ10×1, stainless steel or PVC hose.
11.Normal instrument working conditions
a)Ambient temperature：(-5～50)℃；
b)Relative humidity<=90％
c)Power supply: AC voltage(220±22)V，Frequency(50±0.5)Hz
d)There is no corrosive gas in surrounding air.
e)There is no other electromagnetic field apart from geomagnetic field.
f)There is no performance-affected oscillation in surrounding environment.
12.Dimension (length x width x height ) ：
a)Measuring unit：224mm×288mm×628mm hole size:262mm×602mm
b)Electronic unit:144mm×144 mm×150 mm hole size:138mm×138mm
13. Weight
a) Measuring unit: 10kg
b) Electronic unit:2kg
