EIT LiQlyzer pH Meter

LQPH-T30AC	LQPH-T40AC	LQPH-T60AC
Range: 0-14pH
Communication: 4-20mA RS485 ModbusRTU
Working Condition: 0-60°C
Power Supply: 240VAC
Installation: Panel/ Wall mounted/ Pipeline
Model	LQPH-T30AC/T40AC	LQPH-T60AC
Accuracy	±3%FS	±1%FS
Relay control contacts	3A 250VAC, 3A 30VDC	5A 240VAC, 5A 28VDC, 120VAC
Protection	IP54	IP65
Dimension	96*96*135(mm)	144*144*107(mm)
Hole Size	92.5*92.5(mm)	138*138(mm)
Other Functions	-	Data record &Curve display

EIT LiQlyzer pH Sensor

How to choose a SUITABLE pH Sensor

The ideal probe must first be chosen for accurate pH measurements. The following sample criteria should be taken into account:

1. Medium
2. Homogeneity
3. Process temperature and pressure
4. Container size range for pH

The decision becomes especially important for non-aqueous, poor conductivity, protein-rich, and viscous materials since these samples are prone to numerous causes of inaccuracy for general purpose pH sensor. A pH sensor accuracy and reaction time depend on a variety of variables. Aqueous solutions at normal temperature with a neutral pH and high conductivity may take longer to measure than those at extreme pH and temperature levels or in samples with low conductivity. The significance of the various sample types is outlined below using the various probe properties as a point of departure.

Different electrode junctions with a focus on particular applications

SPH1701 Ceramic pore parameter electrode
Using PTFE diaphragm, adopts low noise cable
Suitable for General Industrial Process

SPH1728 Measure material antimony
not easy to hydrolyze in the case of hydrofluoric acid environment media
Suitable for <1000ppm HF concentration

SPH1729 Solid liquid junction
The reference electrode system is a non-porous, solid, non-exchange
Suitable for seawater pH measurement

SPH1737 Measure material antimony
not easy to hydrolyze in the case of hydrofluoric acid environment media
Suitable for >1000ppm HF concentration

SPH1755 long-distance reference diffusion path
Flat Ultra-bottom impedance-sensitive glass film serves as the electrode
Suitable for strong acid/alkaline high sludge density measurement

SPH1768 electrode material PP
high impact resistance, mechanical strength and toughness, resistance to a variety of organic solvents and acid and alkali corrosion
Suitable for viscous fluids, protein environment, silicate, chromate, cyanide, NaOH, seawater, brine, petrochemical, natural gas liquids, high-pressure environment

SPH1778 gel electrode
flat desulfurization electrode more thicker, not easy to adhere to impurities
Suitable for desulfurization industry

SPH1788 low-resistance sensitive film bulb ≤30MΩ
gel electrolyte and solid electrolyte salt bridge
Suitable for pure water, low Ion concentration environment

SPH1797 gel and solid dielectric double liquid interface
Used with 316L stainless steel sheath or PPS sheath
Suitable for organic solvent and non-aqueous environment

Model No	SPH1701	SPH1728	SPH1729	SPH1737	SPH1755	SPH1768	SPH1778	SPH1788	SPH1797
Measure material	PP+GF	Antimony	Titanium alloy	Antimony	PP+GF (Flat)	PP+GF
Reference system	Ag/AgCl/KCl	SNEX Ag/AgCl/KCl	SNEX(Blue) Ag/AgCl/KCl	SNEX Ag/AgCl/KCl	Ag/AgCl/KCl	SNEX Ag/AgCl/KCl			SNEX (yellow) Ag/AgCl/KCl
Electrolyte solution	3.3M KCl								Saturated LiCl solution
Membrane resistance	<500MΩ				<600MΩ	<600MΩ	<600MΩ	≤30MΩ (at 25℃)	<500MΩ
Liquid junction	Ceramic cores	SNEX
Measurement range	2-12pH	0-14pH		2-12pH	0-14pH			2-12pH
Pressure resistance	≤0.3Mpa	≤0.6Mpa				-1MPa-2.0MPa	≤0.6Mpa
Application	Treated Water	Hydrofluoric acid environment, HF<1000PPM	Sea water	Hydrofluoric acid environment, HF>1000PPM	Strong acid, strong base, waste water and chemical process	Viscous fluids, protein environment, silicate, chromate, cyanide, NaOH, seawater, brine, petrochemical, natural gas liquids, high-pressure environment	Flue gas desulfurization environment	Pure water, low Ion concentration environment	Organic Solvent and Non-aqueous Environment
Accuracy	±0.05pH
Housing material	PP
Temperature compensation	Standard PT1000 (Optional) PT100, NTC10K
Temperature range	0-80℃
Cable length	Standard 10m cable, can be extended to 100m
Connection	Top & Bottom ¾NPT ; Rotary locking & ¾NPT thread/S8/PGI3.5/AS9/AK9/VP/S7