Hanna HI97700 Ammonia Low Range Photometer 0-3 mg/L

Hanna HI97700 Ammonia low range portable photometer

The Hanna HI97700 is a pocket-sized, single-parameter photometer built for trace ammonia checks on process water, boiler feed and effluent samples. It covers 0.00 to 3.00 mg/L ammonia nitrogen with 0.01 mg/L resolution, which suits polishing-stage and receiving-water checks where values stay low. The display can switch between ammonia nitrogen and the NH₃ or NH₄⁺ forms. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer; we quote the HI97700 to industrial and laboratory buyers across Oman and the GCC.

The model number follows Hanna’s HI977xx pattern for dedicated photometers: the last digits identify the chemistry, so HI97700 always means ammonia low range and cannot be reconfigured for another analyte. Reagents carry their own HI93xxx codes, listed below, and must be ordered separately from the meter.

HI97700 technical specifications

How the HI97700 measurement works

Ammonia reacts with the Nessler reagent to form a yellow-brown compound. The depth of colour is proportional to ammonia concentration, and the meter reads absorbance at 420 nm against an unreacted blank of the same sample, then converts it to mg/L using the Lambert-Beer relationship.

Inside the case a reference detector tracks the LED output, so battery sag or a warm ambient does not move the blank. A lens gathers the light leaving the cuvette, which is why scratches and small glass imperfections matter less than with a simple colorimeter, and the cap notch locks the cuvette in the same orientation every time. A built-in tutorial mode walks the operator through sampling, reagent quantity and timers on screen, so the instrument can be handed to a technician who is not a chemist.

Reagents, procedure and interferences for HI97700

The test uses a 10 mL sample, two liquid reagents added drop-wise, and a 3 minute 30 second countdown that the operator can skip by pressing Read twice if the sample was already prepared.

Reagent sets are supplied as HI93700-01 (100 tests) and HI93700-03 (300 tests). Follow the zeroing order given in the manual for this method, and read within the time the manual allows after the countdown ends.

Known interferences listed for this method:

• Hardness above 1 g/L
• Iron
• Sulfide, which can cause turbidity
• Organics such as acetone above 0.1 %, alcohols, aldehydes, aliphatic and aromatic amines, chloramines, glycine and urea above 10 mg/L; distillation is needed to remove them

Where the HI97700 sits among Hanna photometers

Choose the low-range model when typical readings are below about 3 mg/L. The medium-range HI97715 reaches 10.00 mg/L and the high-range HI97733 reaches 100.0 mg/L as NH₄⁺; all three use the same Nessler chemistry family and 420 nm LED, so one technician can run any of them with the same handling habits.

Selection and ordering checklist for HI97700

• Confirm expected ammonia concentration stays inside 0.00 to 3.00 mg/L; otherwise dilute or use HI97715 or HI97733
• Decide whether results should be reported as NH₃-N, NH₃ or NH₄⁺
• Order HI93700-01 or HI93700-03 reagent sets; they are not included with the meter
• Add HI97700-11 CAL Check cuvettes if periodic performance validation is required
• Check the sample for the interferences listed above before relying on a result

Validation, handling and maintenance of HI97700

The CAL Check function lets the operator verify the optical system with NIST-traceable cuvettes (HI97700-11) at any time and apply a user calibration if the reading drifts. GLP information is stored with the meter, and the last 50 readings can be reviewed on screen.

Keep cuvettes clean with the cleaning solution and a lint-free cloth, never touch the lower half of the glass, and store the meter in its carrying case. Replace the three AA cells when the battery icon appears; the meter keeps its logged readings and settings. For long storage between field trips remove the batteries and close the reagent bottles tightly.

Typical applications of HI97700 in Oman and the GCC

In desalination plants the HI97700 is a quick way to confirm ammonia carry-over in permeate or in chlorination-dechlorination steps. Power stations use it on cycle chemistry samples, municipal and industrial wastewater operators in Oman use it to check nitrification performance, and oil and gas sites use it on produced-water treatment and discharge compliance spot checks.

Heat is a practical factor in the Gulf. Reaction times in the manual are given at 25 °C, so samples that sit in a vehicle at much higher temperature should be allowed to equilibrate, and the meter itself is rated for 0 to 50 °C. The sealed optics and IP67 floating case also cope with dust and spray on plant walkdowns.

Information to send with an RFQ for HI97700

• Quantity of meters and whether reagent sets (HI93700-01 or HI93700-03; CAL Check HI97700-11) and CAL Check cuvettes are also required
• Sample matrix and expected concentration, so we can confirm the range suits the application
• Delivery location in Oman or the GCC and required lead time
• Any need for spare cuvettes, carrying case or cleaning solution
• Project or tender reference, if applicable

Documents and quotation

The instruction manual for the HI97700 is attached on this page and covers specifications, the reagent procedure, CAL Check validation and error messages.

Send the part number HI97700, the quantity and your delivery location and we will reply with availability and a quotation.