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Potassium by ion-selective electrode in an IP57 handheld kit.
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APERA INSTRUMENTS / ION400-K / AI4356
The ION400-K measures potassium ion (K⁺) concentration directly in aqueous samples with Apera’s IndSen 2071M-K-TS combination electrode, which has a built-in temperature sensor. The electrode covers 0.039 to 39,000 mg/L (10⁻⁶ to 1 mol/L), and the meter reads in pX, mol/L, ppm or mg/L, with mV and temperature.
The kit includes four K⁺ calibration standards and TISAB-D ionic strength adjuster. The meter recognizes the electrode automatically, is IP57 rated and runs on four AA batteries.
Pick the ion first, then decide whether you also need pH. ION400 kits measure ion, mV and temperature; PION400 kits add pH with a second electrode. Each card opens that product page.
AI4356
Potassium (K⁺)
IndSen 2071M-K-TS electrode with four K⁺ standards and TISAB-D.
AI4364
Potassium (K⁺) + pH
Adds the 201T-S pH electrode and three pH buffers.
AI4325
Ammonium (NH₄⁺) / TAN
IndSen 2071M-NH-TS electrode with four NH₄⁺-N standards and TISAB-D.
AI4333
Ammonium (NH₄⁺) / TAN + pH
Kit list follows Apera’s ION400-K product page.
The IndSen electrode uses an ultra-firm PVC membrane with a solid, non-volatile electrolyte; Apera states this gives two to three times the life of an ordinary PVC electrode. The reference is double-junction with a silver-ion-free gel, the housing is 16 mm and IP67 rated, and a 30 kΩ NTC thermistor in the body feeds automatic temperature compensation.
It can be stored dry. Before measuring, soak it 5 to 10 minutes to pre-condition. Apera rates it at 90% response in 10 seconds and a stable reading about 2 minutes after immersion, with a slope of 54 ± 5 mV at 25°C, an operating range of 5–50°C and sample pH of 1.0–9.
The meter supports one- to three-point calibration with guided prompts and shows the electrode slope afterwards. The kit’s 1, 10 and 100 ppm K⁺ standards cover three points; choose the points that bracket your samples.
The meter flags calibration solution errors and aging electrodes, and displays the slope so you can judge electrode condition before measuring.
Besides K⁺ and NH₄⁺, the meter is preconfigured for Ca²⁺, NO₃⁻, Cu²⁺, F⁻, Na⁺, Cl⁻, Br⁻, I⁻, Ag⁺, S²⁻, Pb²⁺, Cd²⁺ and Hg²⁺, plus user-defined “Ion X” settings, so it can run other Apera ion-selective electrodes.
TISAB-D is Apera’s total ionic strength adjustment buffer for its potassium and ammonium electrodes. Add it in the same proportion to the calibration standards and to every sample so the electrode sees the same ionic background in both.
Keep samples within the electrode’s pH range of 1.0 to 9 and its operating range of 5–50°C. The 1000 ppm K⁺ standard is the highest point in the kit; the electrode itself reads up to 39,000 mg/L.
Ion concentration reads 0.00–10.00 pX at 0.01 pX resolution, ±1.0% F.S ±1 digit; mV reads −1000 to 1000 mV, ±0.2% F.S ±1 digit; temperature reads 0–100°C at 0.1°C, ±0.5°C ±1 digit.
The meter measures 86 × 196 × 33 mm, weighs 331 g, runs on four AA batteries and is IP57 rated against dust and water. The IndSen 2071M-K-TS covers 0.039–39,000 mg/L (ppm); 10⁻⁶ to 1 mol/L, with a 1 m cable and 8-pin connector.
The same meter platform comes as ION400-NH (AI4325), PION400-K (AI4364) and PION400-NH (AI4333). ION400 kits measure ion, mV and temperature; PION400 kits add pH with the 201T-S electrode and buffers. Choose by the ion you report and whether you also need pH from the same handheld.
Potassium ion concentration, mV and temperature. Ion results display in pX, mol/L, ppm or mg/L.
The IndSen 2071M-K-TS electrode covers 0.039–39,000 mg/L (ppm); 10⁻⁶ to 1 mol/L.
No. Apera states it can be stored dry. Soak it 5 to 10 minutes to pre-condition before measuring.
1, 10 and 100 ppm K⁺ standards (50 mL each), a 1000 ppm K⁺ standard (100 mL) and 50 mL of TISAB-D.
Yes. It is preconfigured for 15 ions and accepts user-defined “Ion X” settings, with automatic electrode recognition.
Apera ships the instruction manual in the kit but does not publish it online. Contact us and we will request a copy.
Apera’s limited warranty covers the meter for three years and the probes for six months from delivery, excluding accidental damage, improper use, normal wear and the other causes in Apera’s terms. Warranty service is handled through Apera; returns are coordinated with Blue Tiger Scientific.
Review ION400-K AI4356 against the ion and range you report, whether you need pH from the same meter, and the standards you will keep on hand. Return to the live price and ordering controls when the configuration fits your work.
APERA INSTRUMENTS, LLC warrants this instrument to be free from defects in material and workmanship and agree to repair or replace free of charge, at the option of APERA INSTRUMENTS, LLC, any malfunctioned or damaged product attributable to the responsibility of APERA INSTRUMENTS, LLC for a period of THREE YEARS for the instrument (SIX MONTHS for the probes) from the delivery.
This limited warranty does NOT cover any issues due to:
The ION400-K instruction manual ships printed in the kit; Apera does not publish it online. For a copy before you order, or help with setup and calibration, contact Blue Tiger Scientific and we will request it from Apera.
email us here: info@bluetigerscientific.com or live chat
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