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Apera ION400-NH portable ammonium/TAN meter with IndSen electrode
Apera ION400-NH kit in carrying case with NH4+-N standards and TISAB-D
Apera IndSen 2071M-NH-TS ammonium ion-selective electrode
Apera TISAB-D ionic strength adjustment buffer
Apera ION400-NH portable ammonium/TAN meter with IndSen electrode
Apera ION400-NH kit in carrying case with NH4+-N standards and TISAB-D
Apera IndSen 2071M-NH-TS ammonium ion-selective electrode
Apera TISAB-D ionic strength adjustment buffer

Apera Instruments ION400-NH Portable Ammonium Ion/TAN Meter Kit

$860.00

    Ammonium/TAN by ion-selective electrode in an IP57 handheld kit.

    • IndSen 2071M-NH-TS ISE: 0.18–9,000 mg/L (ppm)
    • Reads pX, mol/L, ppm or mg/L, plus mV and temperature
    • Four NH₄⁺-N standards plus TISAB-D
    • Automatic electrode recognition; four AA batteries

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APERA INSTRUMENTS / ION400-NH / AI4325

Ammonium and TAN by electrode.
Lab or field.

The ION400-NH measures ammonium (NH₄⁺) and total ammonia nitrogen (TAN) directly in aqueous samples with Apera’s IndSen 2071M-NH-TS combination electrode, which has a built-in temperature sensor. The electrode covers 0.18 to 9,000 mg/L, and the meter reads in pX, mol/L, ppm or mg/L, with mV and temperature. Apera lists wastewater treatment, environmental monitoring, fertilizer management and research among its uses.

The kit includes four NH₄⁺-N calibration standards and TISAB-D ionic strength adjuster. The meter recognizes the electrode automatically, is IP57 rated and runs on four AA batteries.

Apera ION400 portable ion meter with ion-selective electrode
ION400 meter with the IndSen electrode. The displayed reading is illustrative, not a sample result.
Choose your ion meter kitClick or tap to compare 4 kitsChoose an item below - click or tap here to close

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.

Know what arrives
in the carrying case.

Included item Order contents
ION400 ion meter Handheld IP57 meter, four AA batteries.
IndSen 2071M-NH-TS electrode Combination ammonium ion-selective electrode with built-in temperature sensor, 1 m cable.
1000 ppm NH₄⁺-N standard 100 mL; Apera notes it is the stock for preparing fresh 1, 10 and 100 ppm standards.
NH₄⁺-N calibration standards 1, 10 and 100 ppm, 50 mL each.
TISAB-D Total ionic strength adjustment buffer, 50 mL.
Carrying case Apera lists it at 360 × 275 × 80 mm.
User manual ION400-NH operation and calibration.

Kit list follows Apera’s ION400-NH product page.

Apera ION400-NH kit in its carrying case with meter, electrode, standards and TISAB-D
ION400 kit as shipped: meter, electrode, calibration standards and TISAB-D in the foam-lined case.
Apera IndSen 2071M-NH-TS combination ammonium ion-selective electrode
IndSen 2071M combination ion-selective electrode with built-in temperature sensor and 8-pin connector.

Store it dry.
Condition it before use.

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 2.0–8.5.

Calibrate, then read in the unit you need.

Calibrate with the kit standards

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 NH₄⁺-N standards cover three points; choose the points that bracket your samples.

Self-diagnosis

The meter flags calibration solution errors and aging electrodes, and displays the slope so you can judge electrode condition before measuring.

Fifteen ions preset

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.

Report NH₄⁺-N or NH₄⁺.
Control the sample pH.

The electrode senses only the ammonium ion. In basic water ammonium converts to free ammonia (NH₃), which an ammonium ISE cannot detect: Apera notes about 15% is NH₃ at pH 8.5, and above pH 9 readings come out falsely low. Below pH 6, about 99.9% is NH₄⁺.

When sample pH is above 6.0, Apera’s procedure adds TISAB-D at 10 mL per 100 mL of sample, which usually brings it to pH 4–5; add it to the standards at the same 10% ratio. The kit standards are labeled as NH₄⁺-N, the unit most permits use for TAN. Report NH₄⁺-N/TAN with a molecular weight of 14, or NH₄⁺ with 18, without recalibrating; 1 mg/L NH₄⁺-N equals 1.29 mg/L NH₄⁺. See Apera’s ammonia and TAN guide.

Apera TISAB-D total ionic strength adjustment buffer for potassium and ammonium electrodes
TISAB-D, shown in Apera’s 250 mL retail bottle. The kit includes 50 mL.

Check the specifications.

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-NH-TS covers 0.18–9,000 mg/L (ppm); 1 × 10⁻⁵ to 0.5 mol/L; 5.0–0.3 pNH₄, with a 1 m cable and 8-pin connector.

Compare the other 400 Series ion kits.

The same meter platform comes as ION400-K (AI4356), 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.

ION400-NH buyer questions

What does the ION400-NH measure?

Ammonium ion concentration, mV and temperature. Ion results display in pX, mol/L, ppm or mg/L.

What is the ammonium measuring range?

The IndSen 2071M-NH-TS electrode covers 0.18–9,000 mg/L (ppm); 1 × 10⁻⁵ to 0.5 mol/L; 5.0–0.3 pNH₄.

Does the electrode need to be stored wet?

No. Apera states it can be stored dry. Soak it 5 to 10 minutes to pre-condition before measuring.

Which standards come in the kit?

1, 10 and 100 ppm NH₄⁺-N standards (50 mL each), a 1000 ppm NH₄⁺-N standard (100 mL) and 50 mL of TISAB-D.

Does it read TAN or ammonium?

Both. The electrode senses NH₄⁺; the meter reports NH₄⁺-N/TAN with a molecular weight of 14 or NH₄⁺ with 18, with no recalibration needed to switch. 1 mg/L NH₄⁺-N equals 1.29 mg/L NH₄⁺.

Why do high-pH samples read low?

Ammonium converts to free ammonia (NH₃) as pH rises, and the electrode cannot detect NH₃. Apera adds TISAB-D at 10 mL per 100 mL when sample pH is above 6.0, bringing it to about pH 4–5.

Can the meter run other ion electrodes?

Yes. It is preconfigured for 15 ions and accepts user-defined “Ion X” settings, with automatic electrode recognition.

Is there a manual online?

Apera ships the instruction manual in the kit but does not publish it online. Contact us and we will request a copy.

What warranty applies?

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.

Confirm the exact configuration before ordering.

Review ION400-NH AI4325 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.

Back to price and ordering ↑
    SpecificationDetail
    Model / manufacturer catalogION400-NH / AI4325
    Parametersammonium ion, mV, temperature
    Ion range / resolution / accuracy0.00–10.00 pX / 0.01 pX / ±1.0% F.S ±1 digit
    Ion unitspX, mol/L, ppm, mg/L
    mV range / resolution / accuracy−1000 to 1000 mV / 1 mV / ±0.2% F.S ±1 digit
    Temperature range / resolution / accuracy0–100°C (32–212°F) / 0.1°C / ±0.5°C ±1 digit
    Preset ions15 (Ca²⁺, NH₄⁺, NO₃⁻, Cu²⁺, F⁻, K⁺, Na⁺, Cl⁻, Br⁻, I⁻, Ag⁺, S²⁻, Pb²⁺, Cd²⁺, Hg²⁺) plus user-defined Ion X
    ElectrodeIndSen 2071M-NH-TS combination ammonium ISE with 30 kΩ NTC temperature sensor
    Electrode measuring range0.18–9,000 mg/L (ppm); 1 × 10⁻⁵ to 0.5 mol/L; 5.0–0.3 pNH₄
    Electrode slope / response54 ± 5 mV at 25°C / 90% in 10 s; stable about 2 min after immersion
    Electrode operating temperature / sample pH5–50°C / 2.0–8.5
    Electrode resistance / stability2–10 MΩ / < 8 mV per 24 h (< 1000 ppm)
    Electrode referenceDouble junction; Ref. I 0.1 mol/L CH₃COOLi gel, Ref. II 3.5 mol/L KCl gel
    Electrode selectivity coefficientsK⁺ 1 × 10⁻¹; Na⁺ 1.6 × 10⁻³; Ca²⁺ 6 × 10⁻⁵; Li⁺ 3 × 10⁻⁵
    Electrode body / cable / connectorTip Ø16 × 120 mm, cap Ø20 × 65 mm, IP67 / 1 m / 8-pin
    Power4 × AA (1.5 V)
    Meter protectionIP57
    Meter dimensions / weight86 × 196 × 33 mm / 331 g
    Carrying case360 × 275 × 80 mm
    Manufacturer limited warrantyThree years for the meter, six months for probes, from delivery; exclusions apply

    Ordering Information

    Ordering detailConfiguration
    Manufacturer catalogAI4325
    Blue Tiger SKUBTS-AI4325
    Order unit1 ION400-NH meter kit
    Order contentsION400 ion meter; IndSen 2071M-NH-TS electrode; 1000 ppm NH₄⁺-N standard (100 mL); 1, 10 and 100 ppm NH₄⁺-N standards (50 mL each); TISAB-D (50 mL); carrying case; user manual
    Replacement electrode and bufferIndSen 2071M-NH-TS electrode; TISAB-D (250 mL)

    Warranty Information

    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:

    • Accidental damage
    • Improper use
    • Normal wear and tear
    • Transportation
    • Storage
    • Failure to follow the product instructions
    • Unauthorized maintenance, modifications, combination or use with any products, materials, processes, systems or other matter
    • Unauthorized repair
    • External causes such as accidents, abuse, or other actions or events beyond our reasonable control.

    ION400-NH documents

    The ION400-NH 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.

    Apera’s guide to ammonia, ammonium and TAN reporting: Confused by ammonia, ammonium and nitrogen?

Questions about a product? Ask us here.

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