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Product Details
Product Overview
HM-DAP is an automatic potentiometric titrator built for the precise determination of acid value and peroxide value in food. It applies cold-solvent automatic potentiometric titration to acid value and potentiometric titration to peroxide value, and ships with national-standard programs for both determinations already installed. A high-precision burette and automatic endpoint recognition make one-click testing possible, while a general titration mode remains available for other potentiometric titrations. The instrument is intended for food enterprises, quality inspection agencies and research institutes that evaluate the oxidative stability of oils and fats.
The instrument follows the second methods of the applicable national food safety standards: GB 5009.229-2025 for acid value (cold-solvent automatic potentiometric titration) and GB 5009.227-2023 for peroxide value (potentiometric titration). The automatic potentiometric titrator is also covered by the verification regulation JJG 814-2015.
Key Features
- Android 10 operating system with a 7-inch color capacitive touch screen for integrated, intuitive operation.
- High-precision titration system driven by a closed-loop stepper motor, with resolution ≥ 1/1,500,000 (reliable resolution ≥ 1/300,000) and a minimum dispensing volume of 0.1 µL.
- Built-in national-standard acid value and peroxide value programs with automatic endpoint determination (multiple jump recognition), automatic curve plotting, and automatic calculation and reporting.
- Creation, editing, storage and quick recall of detection methods.
- Standard non-aqueous composite pH electrode (for acid value) and redox electrode (for peroxide value); multiple professional electrodes can be optionally equipped for other determinations.
- Three-level user permission management and a complete audit trail, consistent with laboratory quality management standards such as GLP/GMP.
- Large-capacity local storage that retains detection data and titration curves, with a built-in thermal printer for immediate printing of results.
- Cloud connection for remote software upgrades; detection data can also be uploaded wirelessly over Wi-Fi and managed through client login.
Applications
The instrument is used to monitor acid value or peroxide value in 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.
Acid value is determined by 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 instrument monitors the pH jump through a non-aqueous phase pH electrode to determine the endpoint and calculate the acid value. Peroxide value is determined by 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
The same catalogue includes colorimetric (photometric) acid value and peroxide value analysers for laboratories that prefer a reagent-based colorimetric approach. These are separate models built on a different measurement principle. Confirm the required method and the expected sample range when choosing between potentiometric titration and colorimetric testing.
Operation and Support
Which samples can this instrument test?
Edible oils and fats, oil-containing foods, and other oil and fat products that require acid value or peroxide value monitoring.
Which methods are used?
Acid value is measured by cold-solvent automatic potentiometric titration (GB 5009.229-2025, second method); peroxide value is measured by potentiometric titration (GB 5009.227-2023, second method).
Can it run titrations other than acid value and peroxide value?
Yes. A general titration mode is available alongside the built-in national-standard programs, and optional electrodes extend the range of determinations.
How is the burette maintained?
The burette supports rapid replacement, and detection methods can be stored and recalled to keep routine testing consistent.
Product Enquiries
Contact our sales representative for product enquiries, configuration information and coordination of service requests.
Sales Contact: Arthur
Email: Arthur@hmdzkj.cn
Tel / WhatsApp / WeChat: +86 18353666151
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