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Product Overview
Acid value and peroxide value are routine indicators of how far an oil or fat has oxidised, and both are measured here on a single automatic potentiometric titrator. HM-DAP is designed for the precise determination of acid value and peroxide value in food: acid value is measured by cold-solvent automatic potentiometric titration and peroxide value by potentiometric titration, with national-standard programs for both already installed. Automatic endpoint recognition supports one-click testing, and a general titration mode remains available for other potentiometric titrations.
Typical users are food producers monitoring frying oil and finished goods, quality inspection agencies, and research institutes studying the oxidative stability of oils and fats. The instrument is operated from an Android 10 interface with a 7-inch colour touch screen and stores results locally with an audit trail.
Key Features
- Two national-standard determinations in one instrument: acid value and peroxide value, each with a pre-installed program.
- One-click testing with automatic endpoint determination (multiple jump recognition), automatic curve plotting, and automatic calculation and reporting.
- High-precision titration system with a closed-loop stepper motor, resolution ≥ 1/1,500,000 (reliable resolution ≥ 1/300,000) and a minimum dispensing volume of 0.1 µL.
- Standard non-aqueous composite pH electrode for acid value and redox electrode for peroxide value, with multiple professional electrodes available optionally for other determinations.
- Creation, editing, storage and quick recall of detection methods, so routine procedures can be repeated consistently.
- Three-level user permission management and a complete audit trail, consistent with laboratory quality management standards such as GLP/GMP.
- Large-capacity local storage for detection data and titration curves, plus a built-in thermal printer for immediate results.
- Cloud connection for remote software upgrades and Wi-Fi upload of data with client login management.
Applications
The instrument is used to monitor acid value or peroxide value across the following sample groups.
Edible oils and fats
- Animal and vegetable oils, hydrogenated oils, shortening, margarine, vegetable fat cream and powdered oils.
Oil-containing foods
- Fried, puffed and baked processed foods, nuts and seasoning sauces.
Other oil and fat products
- Oil-containing raw materials and finished products that require acid value or peroxide value monitoring.
Method conditions for the two determinations are as follows. Acid value (cold-solvent automatic potentiometric titration): the oil is dissolved in isopropanol and anhydrous ether (1:1), free fatty acids are neutralised with potassium hydroxide standard solution, and the endpoint is determined from the pH jump measured by a non-aqueous phase pH electrode. Peroxide value (potentiometric titration): the oil is dissolved in isooctane and glacial acetic acid (2:3), peroxides react with potassium iodide to form iodine, and the solution is titrated with sodium thiosulfate standard solution, with the endpoint determined from the potential jump.
Technical Specifications
Method and Compliance
| Parameter | Specification |
|---|---|
| Measurement method | Automatic potentiometric titration (compliant with GB 5009.229-2025 and GB 5009.227-2023) |
| Acid value repeatability | Complies with the national standard requirement: acid value ≤ 1 mg/g, absolute difference between two independent determinations ≤ 15%; acid value > 1 mg/g, ≤ 12% |
| Peroxide value repeatability | Complies with the national standard requirement: absolute difference between two independent determinations ≤ 10% |
| Instrument titration repeatability | ≤ 0.2% (RSD) |
Titration and Measurement Performance
| Parameter | Specification |
|---|---|
| Burette driver | High-precision closed-loop stepper motor; resolution ≥ 1/1,500,000 (theoretical conversion), reliable resolution ≥ 1/300,000 |
| Minimum dispensing volume | Software-configurable, down to 0.0001 mL (0.1 µL) |
| Burette capacity tolerance | 10 mL burette: ± 25 µL; 20 mL burette: ± 35 µL |
| Potential measurement | −2,000 to +2,000 mV; resolution 0.1 mV; meter indication error ± 0.03% FS |
| pH measurement | −20.000 to +20.000 pH; resolution 0.001 pH; basic error ± 0.003 pH (electronic unit display range, converted from ± 2,000 mV by the Nernst equation) |
| Temperature measurement | −5 to 105 °C; resolution 0.1 °C; basic error ± 0.2 °C |
System and Operation
| Parameter | Specification |
|---|---|
| Operating system | Android 10 |
| Display | 7-inch capacitive touch screen |
| Data storage | ≥ 100,000 records |
| Data interfaces | USB, Wi-Fi, Ethernet |
| Printer | Built-in thermal printer |
Power, Environment and Physical Specifications
| Parameter | Specification |
|---|---|
| Power supply | AC 110–240 V, 50–60 Hz |
| Operating environment | Temperature 0–40 °C, humidity 10%–75% RH |
| Storage environment | Temperature 0–40 °C, humidity 10%–90% RH |
| Dimensions | 310 mm × 226 mm × 233 mm |
| Main unit weight | Approx. 3.7 kg |
Configuration / Accessories
Standard configuration (supplied with the instrument):
| Item | Qty | Specification |
|---|---|---|
| Instrument mainframe | 1 | — |
| Non-aqueous titration composite electrode | 1 | 6510 glass pH non-aqueous titration composite electrode |
| Redox electrode | 1 | 5004 redox electrode |
| Temperature electrode | 1 | T-2 ATC temperature electrode |
| Burette | 1 | 10 mL |
| Burette | 1 | 20 mL |
| Support rod | 1 | Length 220 mm, diameter 10 mm, M8 thread |
| Five-hole electrode holder | 1 set | — |
| Burette sleeve | 1 | — |
| Teflon tube | 1 | 1.5 m, inner diameter 2 mm, outer diameter 3 mm |
| Hose protective sleeve | 1 | PVC, 1.5 m, inner diameter 3.5 mm |
| Quick-twist connector | 6 sets | PEEK, presser 07B-28 thread + presser ring 030 |
| Anti-diffusion head | 1 | — |
| Titration cup | 5 | 100 mL |
| Stirring bar | 1 | 30 mm |
| Stirring bar | 1 | 40 mm |
| Reagent bottle | 2 sets | With bottle cap, 500 mL |
| Visual filter | 2 sets | — |
| CO2 absorbent | 1 bottle | 500 g |
| Power cord | 1 | Three-pin, 1.5 m |
| Printing paper | 1 roll | φ 57 mm × 30 mm |
| Instruction manual | 1 | — |
| Certificate of conformity | 1 | — |
| Warranty card | 1 | — |
Optional electrodes (available separately):
| Electrode | Measuring range |
|---|---|
| 7102 composite fluoride electrode | 10⁻¹–10⁻⁶ mol/L |
| 7101 composite sodium electrode | 10⁻¹–10⁻⁶ mol/L |
| 7103 composite calcium electrode | 10⁻¹–10⁻⁵ mol/L |
| 7105 composite fluoroborate electrode | 10⁻¹–3×10⁻⁶ mol/L |
| 7106 composite nitrate electrode | 10⁻¹–10⁻⁵ mol/L |
| 7107 composite chloride electrode | 10⁻¹–5×10⁻⁵ mol/L |
| 7108 composite silver-sulfur electrode | 10⁻¹–3×10⁻⁷ mol/L |
| 7110 composite iodine electrode | 10⁻¹–5×10⁻⁷ mol/L |
| 7111 composite copper electrode | 10⁻¹–10⁻⁶ mol/L |
| 7112 composite bromine electrode | 10⁻¹–10⁻⁶ mol/L |
| 7115 composite cyanide electrode | 10⁻¹–8×10⁻⁶ mol/L |
| 7116 composite ammonia gas sensing electrode | 10⁻¹–5×10⁻⁶ mol/L |
| 7117 composite ammonium electrode | 10⁻¹–5×10⁻⁶ mol/L |
| 7118 composite potassium electrode | 10⁻¹–10⁻⁵ mol/L |
| 7119 composite carbon dioxide electrode | 10⁻²–10⁻⁴ mol/L |
| 6501 glass composite electrode | — |
Related Models
For laboratories that prefer a reagent-based colorimetric approach, the same catalogue includes colorimetric (photometric) acid value and peroxide value analysers. These are separate models with a different measurement principle, so the choice depends on the required method and the expected sample range. Confirm the intended method before selecting a model.
Operation and Support
Which samples are supported?
Edible oils and fats, oil-containing foods, and other oil and fat products that require acid value or peroxide value monitoring.
Which standards are followed?
GB 5009.229-2025 for acid value (second method, cold-solvent automatic potentiometric titration) and GB 5009.227-2023 for peroxide value (second method, potentiometric titration).
Can other titrations be run as well?
Yes. Besides the built-in national-standard programs, a general titration mode is available, and optional electrodes extend the range of determinations.
How are results recorded?
Detection data and titration curves are stored locally with an audit trail, and results can be printed directly from the built-in thermal printer.
Product Enquiries
Contact our sales representative for product enquiries, configuration information and coordination of service requests.
Sales Contact: Grace
Email: graceliu@hmdzkj.cn
Tel / WhatsApp / WeChat: +86 17853698681
Article address:https://www.hmfoodtesting.com/syyz4/acid-peroxide-value-titrator.html
