How to choose the right PH electrode? [Selection Guide]

Lightning magnetic pH electrodes are divided into different models and parameters according to different applications, reference systems, materials, etc. The following is the parameter table of the pH electrode series:

Electrode model name	Measuring range	reference system	reference solution	Junction	Electrode rod	describe
6201 high precision pH composite electrode	0-14pH	Silver ion trap + long life reference	Rechargeable	Ceramic sand core	Glass	Suitable for routine water samples, precision 0.01pH
6103 open H composite electrode	0-14pH	Ag/Agci	Not rechargeable	open	PEEK	Applicable to routine water samples and general pollution samples
6221 ultrapure water H compound electrode	0-11pH	Long-lived reference (two-stage salt bridge)	Rechargeable	Non-removable glass grinding mouth	Glass	Suitable for ultra-low conductivity water samples such as pure water and deionized water
6121 Low Conductivity pH Combination Electrode	0-11pH	Ag/Agci	Not rechargeable	Porous PTFE	epoxy resin	Suitable for low conductivity water samples above 100μS/cm
6241 conical pH combination electrode	0-14pH	long life reference	Rechargeable	Ceramic sand core	food grade stainless steel	Suitable for solid-state semi-solid penetrating measurement
6242 planar pH composite electrode	0-12pH	Silver ion trap + long life reference	Rechargeable	Non-removable glass grinding mouth	Glass	Applicable to surface or droplet samples
6244 Slim pH Combination Electrode	0-14pH	Silver ion trap + long life reference	Rechargeable	Ceramic sand core	Glass	φ6x100mm; suitable for trace samples above 0.2mL, or thin-mouthed containers
6243 ultra-long pH composite electrode	0-14pH	Silver ion trap + long life reference	Rechargeable	Ceramic sand core	Glass	φ12x260mm; suitable for general measurement, large-volume container samples
6102 Cleanable H Composite Electrode	0-14pH	long life reference	Rechargeable	Removable plastic grinding mouth	epoxy resin	Suitable for highly polluting samples such as emulsions, suspensions, and viscous
6223 ROHS PH composite electrode	0-14pH	long life reference	Rechargeable	Ceramic sand core	lead-free glass	Comply with ROHS standard
6224 high temperature resistant pH composite electrode	0-14pH	long life reference	Rechargeable	Ceramic sand core	Glass	Suitable for 0~100℃ high temperature samples

PH electrode selection guide

sample type	Applications	Recommended electrode
chemical solution	Diluted acid and alkali solutions; chemical fertilizers	6201 high-precision pH composite electrode; 6103 open pH composite electrode
chemical solution	High-purity ketones, alcohols, ethers, etc.	6221 Ultrapure Water pH Composite Electrode
food and drink	ice cream; milk; cheese, etc.	6103 open pH combination electrode; 6102 washable pH combination electrode
	jam; peanut butter	6103 open pH combination electrode; 6102 washable pH combination electrode
	cooking oil	8211 non-aqueous pH titration electrode; 6102 washable pH composite electrode
	Alcohol; juice; milk tea; coffee; cola; iced tea, etc.	6201 high-precision pH composite electrode; 6103 open pH composite electrode
	soy sauce; vinegar	6201 high-precision pH composite electrode; 6103 open pH composite electrode
	mineral water; bottled water; pure water	6221 ultrapure water pH composite electrode; 6121 low conductivity pH composite electrode
	Meat; Fruit; Fish; Cheese; Pasta; Cheese; Vegetables; Preserves	6241 conical pH composite electrode; 6242 planar pH composite electrode
Biopharmaceutical	Plasma and gastric juice; drug formulations; protein samples; urine; enzyme solutions; gels	6201 High Precision pH Composite Electrode; 6244 Slender pH Composite Electrode; 6242 Plane pH Composite Electrode
	Salt water; Purified water; Deionized water; Distilled water	6221 Ultrapure Water pH Composite Electrode
	micro sample; centrifuge tube; test tube	6244 Slim pH Combination Electrode
Industrial samples	Waste water; sewage; printing and dyeing water; dye; ink; varnish; paint; latex; slurry	6103 open pH combination electrode; 6102 washable pH combination electrode
	bleaching solution; washing solution; plating solution	6103 open pH combination electrode; 6102 washable pH combination electrode
	boiler water	6221 ultrapure water pH composite electrode; 6121 low conductivity pH composite electrode
	Leather; Paper; Textiles	6242 planar pH composite electrode
daily care	Shampoos; hair dyes; cosmetics; detergents	6103 open pH combination electrode; 6102 washable pH combination electrode
daily care	skin	6242 planar pH composite electrode
Environmental monitoring	tap water; surface water; rainwater	6221 ultrapure water pH composite electrode; 6121 low conductivity pH composite electrode
Environmental monitoring	soil	6241 conical pH combination electrode
bulky container	Canned and barreled samples	6243 ultra-long pH composite electrode
high temperature sample	80~100℃	6224 high temperature resistant pH composite electrode

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