CMS-01 High-frequency reciprocating rig (HFRR) for assessment of diesel fuel lubricity
Automatic Air Condition Control System
1. Significance of environment temperature and humidity control of test oil
The assessment test of diesel fuel lubricity is a quantitative test with high precision requirement, and has the strict requirements on the temperature and humidity in the test cabinet. The standards ISO 12156-1:2006stipulate a dynamic allowable environment temperature and humidity range via chart. The accurate control on the temperature and humidity in the test cabinet affects the test result obviously. Meanwhile, for the calculation of mean value of corrected abrasion spot WS1.4, the different temperature and humidity changes affect the repeatability and reproducibility of test result directly due to the existence of temperature and humidity correction factor HCF.
The revised standard ISO 12156-1:2016 has updated evaluation method of diesel fuel lubricity, and reduced the allowable temperature and humidity range of test environment obviously compared with the standard before revision. Meanwhile, the mean diameter of abrasion spot, not the mean diameter of abrasion spot corrected as per temperature and humidity, is used as the final test result. Therefore, in order to meet the revised standard, the test method has the stricter requirement on the temperature and humidity of test environment so it is necessary to use the Automatic Air Condition Control System to control the test environment.
2. Full conformity with standard method requirements
In the standard ISO 12156-1:2006 Evaluation Method for Diesel fuel Lubricity (High Frequency Reciprocating Rig Method), it is stipulated that the test result has a repeatability not more than 63μm and a reproducibility not more than 102 μm. The repeatability and reproducibility values stipulated in the standard are a little higher, which affect the judgment and comparison of test result, and bring certain difficulty to the work of test technician. However, based on the calculation equation of corrected abrasion spot diameter WS1.4: WS1.4 = MWSD + HCF(1.4 - AVP), the calculated value of HCF(1.4 - AVP) is 0 when AVP = 1.4 kPa; at this moment, the mean abrasion spot diameter is equal to the corrected abrasion spot diameter. Through the accurate control on temperature and humidity in the test cabinet, the mean vapor pressure is closer to 1.4kPa and the corrected value is reduced obviously so that the corrected value of test is much closer to the measured value, and the uncertainty of test result caused by the change of test environment is prohibited.
The Automatic Air Condition Control System matching the CMS-01 tester controls the temperature and humidity in the test cabinet by the optimized combined control method so that the calculated value of HCF correction item is minimized as much as possible, and the repeatability and reproducibility indicators are improved obviously when the accuracy and efficiency of test result are guaranteed. Even if according to the revised international standard ISO 12156-1:2016, the Automatic Air Condition Control System matching the CMS-01 tester can still maintain the temperature and humidity of test environment in a narrowed allowable environment temperature and humidity range, and ensure that the test device meets the stricter test method requirements of revised standard.
3. Perfect basic configuration
The Automatic Air Condition Control System, as one of basic configurations of CMS-01 High-frequency reciprocating rig (HFRR) for assessment of diesel fuel lubricity manufactured by Beijing Gaoke, consists of CMS-01 temperature and humidity controller and constant temperature and humidity test cabinet. The basic temperature and humidity control system has the perfect environment control functions including but not limited to heating, cooling, humidifying and drying. During test, the computer can adjust the temperature and humidity control system automatically in accordance with the user’s setting to meet the routine test requirements of the user having the good laboratory environment.
In need of outstanding environment temperature and humidity control capacity, the user is recommended to select the enhanced Automatic Air Condition Control System designed by the Company for the ordinary worksite; this system uses the compressor as the independent air regulator, and has the stronger and more effective control ability on the environment in the test cabinet; Even if on the work site that cannot meet the perfect laboratory environment control requirements, this device can maintain the stable and reliable temperature and humidity in the test cabinet.
4. Proprietary innovative technology
The Automatic Air Condition Control System was first proposed and applied in the High-frequency reciprocating rig (HFRR) for assessment of diesel fuel lubricity by the Company, and has obtained the Chinese patents at No. ZL2012 20533766.2 (basic type: semiconductor refrigeration) and No. ZL2013 20497422.5 (enhanced type: compressor refrigeration).
5. Flexible update service
The enhanced Automatic Air Condition Control System, whose software and hardware can operate separately, can provide the perfect test environment control capacity for the High-frequency reciprocating rig (HFRR) for assessment of diesel fuel lubricity without similar function; the user can bring forward the specific configuration requirements, and the Company can upgrade this system directly based on the user’s existing equipment. This system is also applicable to other test equipment needing the similar environment control capacity.