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HFRR (High Frequency Reciprocating Rig)
/ Operation
Setting-up a test
After cleaning the specimens the operations necessary to prepare the instrument for a test are mounting the test specimens in the specimen holders, attaching the specimen holders to the mechanical test unit and attaching the test load to the load pin.
Items required for setup:
- Upper and Lower specimen holders
- The test specimens - lower (plate/disc) and upper (ball)
- Two stainless steel button head screws that secure the lower specimen and grub screw that secures the upper specimen
- Three black cap head screws that secure the upper (x1) and lower specimen holder (x2)
- Hex keys used to secure the lower and upper specimens and tweezers to hold the upper (ball) and lower (disc) specimens and the two stainless steal button heads screws.
- Hex driver to tighten the three black cap heads screws
- Main RTD temperature probe
- Test fuel
- Weight hanger cord
- Weight set (200g standard diesel test)
Below is a video describing how to setup an HFRR test. Alternatively follow the steps below the video to setup an HFRR test.
1. Specimen Holder Assembly
Using the tweezers place the upper (ball) specimen in the 6.0 mm recess in the upper specimen holder and tighten the retaining screw using the appropriate hex key. The retaining screw need only be tight enough to prevent the upper specimen from rotating during the test. Finger tight is enough.
Using the tweezers place the lower specimen in the circular recess in the lower specimen holder with the polished side uppermost. Again using the tweezers pick up one of the button head screws, place over the entry to one of the tapped holes by the side of the specimen and screw down using the appropriate hex key as shown below. Repeat for the other button head screw in the other tapped hole. Once again finger tight is enough.
Securing lower specimen with hex key
2. Attaching the specimen holder to the instrument
The lower specimen holder has a small (1.6mm diameter) hole in one side. This is the locating hole for the RTD temperature probe which measures the specimen temperature during the test. Place the lower specimen holder on the heater block with the small hole on the left side (when viewing from the front of the mechanical unit). Insert two of the black cap head screws and tighten to finger tight using the correct hex key (Do not over tighten these screws, as this will damage the heater block).
Locate the upper specimen holder on the two alignment pins on the end of the mechanical unit pushrod, insert the third black cap head screw and tighten to finger tight as shown below.
Secure upper specimen holder
3. Inserting the RTD temperature probe
Insert the RTD temperature probe into the small hole in the left side of the lower specimen holder as shown below. The probe inserts into the hole to a depth of about 25mm. Make sure the probe is fully inserted.
NOTE: The probe contains a ceramic sensor in the tip. This will be permanently damaged if the probe is bent even by a small amount. Take care not to bend the probe when fitting and removing it from the lower specimen holder
Insert RTD Probe into Lower Specimen Holder
4. Adding test fuel
Using a pipette, place 2.0 ml of the test fluid in the lower specimen holder as shown below.
Place test fluid into lower specimen holder
5. Attaching the load weight
Locate the rings at each end of the weight hanger support cord into the grooves on each end of the load pin passing through the upper specimen holder as shown below. Gently suspend the weight hanger with the selected weights from the support cord. Note that the weight hanger weighs 100g, so for a test load of 200g, the weight hanger and one additional weight should be used.
Apply test load using weight hanger cord and weight set
This completes the preparation of the mechanical test unit, the instrument is now ready to start the test.
Starting the test
Depending on the preferred method the temperature and/or humidity must be checked before starting a test. For CEC F-06-A-96, ISO 12156-1 and IP 450/2000 users, the ambient temperature and relative humidity must be in the range specified by the relevant test method before the test can be started. The ambient temperature and relative humidity can either be manually entered into the HFRR system or if the unit is fitted with an automatic temperature and humidity probe then the HFRR will automatically enter the data before the test starts and finishes. The WS1.4 will be determined by these factors. For ASTM D6079-02 users, the relative humidity must be above 30% before the test can conform to the method.
From this section there are two ways of controlling the HFRR. This is either by software where the control unit is connected to a PC by a serial cable (remote mode) or starting a test from the control panel of the HFRR control unit (standalone mode). Software operation is the preferred way as it has a easier to use interface and better graphical readout of the test in operation.
Please select the preferred way of starting a test
