WDW Series Computer Control Type Electronic Universal Testing Machine（Single Arm Type）

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Ⅰ、Main functions
WDW series are suitable for tensile, compression, bending cutting,shearing and tearing test of rubber, plastic, electrical wire and cable, composite, plastic profiled bar, waterproof roll, etc. They may add test metheds or rules according to customers’requirement .They are essential testing instrument for quality testing section, university and college, research institution and industrial and mining enterprise.
Ⅱ、Product features
This machine equips alternating servo motor for driving crosshead and imported photoelectric encoder for displacement measure. This machine is accompany with the digital multi-channel closed loop control system which applicates the latest moitoring and control systems with lots of advanced profassional and technical development. Control software can automatically finger out routine data, such as tensile modulus of elasticity, extend rate after rupture, non-proportional extend strength RP0.2, etc. It can realize three close loops control and real time display many testing curves of force-displacement, force-time, and stress-strain. These curves automatically switch. Testing process control and data processing conform to the requirements of GB. This machine has the following performances: Auto zero, auto gear shifting or no subsection, auto indication, auto save, unicontrol or multistep programmed control, auto stop, auto analysis or assistant manual analysis, batch test, testing result statistic, curve select and over load protection. And the machine is beautiful, multifunctional, and oprates easily and reliably.
Ⅲ、Technical Specification:

Type parameters	WDW-1A	WDW-2A	WDW-5A	WDW-1	WDW-2	WDW-5
Measuring range of force (kN)	0.01～1	0.02～2	0.05～5	0.01～1	0.02～2	0.05～5
Accuracy of testing force	±1%
Resolusion of testing force	1/20000 of maximum testing force
Relative error of displacement	±0.5%
Resolusion of crosshead displacement measurement	0.01 mm
Speed range of crossbeam	0.01 mm/min～500 mm/min，step less speed regulation and arbitrary setting
Valid testing space (mm)	800
Power supply	220V±10%，50Hz			380V±10%，50Hz
Working environment	10℃～30℃, relative humidity≦80%
Main configuration	Alternating servo motor and speed adjustment system, precision photoelectric encoder.			Imported servo motor and speed adjustment system, precision photoelectric encoder.
Overall dimension of host machine (mm)	600×420×1700
Weight(kg)	300

Q: Where is the pressure gauge checked?: The pressure gauge is checked by the quality and Technical Supervision Bureau's measurement test.

Q: For example, a 1.6 mpa. How do you measure it?!: Multimeter hit 2K (digital table), measuring remote table above three terminals in any two terminals: if it is 400 Ou mother, these two is high-end, low-end, and the rest that is the sliding end (middle end). Next, the access line, if the clock indicating pressure increases, while the display is declining, the high-end, low-end swap line.In general, three terminals, the bottom is the middle end, the middle is high-end, and the top is the low-end. Consistent with the electric contact pressure gauge.Have a try.In general, three terminals, the lower end of the remote meter to measure the above three terminals in any of the two terminals, the top is the low-endIn order to measure the current, the voltage of the standard resistance is measured, and the current is calculated according to the voltage. The output between 4 and 20mA depends on the type of the remote meter. Analog remote meter is generally 4 to 20mA output, to determine whether the pressure gauge is normal, if it is digital remote meter, that is, high-end 24V voltage, multimeter is not measuredA high, medium, and low end pressure gauge shall be a three position contact type control pressure meter. If no signs are available, you can use either the ohmmeter or the buzzer test of the meter. Use the pencil first low limit hands to contact with the actual pressure gauge contact is closed, with a multimeter measuring three end exchange both ends of the middle and low end, the rest is high, then closed contact separately, the high pressure closed with the actual pointer to pointer, and then test interoperability both ends of the middle and high, so you can points out.

Q: Function of electric contact pressure gauge: The instrument comprises a measuring system, an indicating system, an outer shell, a magnetic auxiliary electric contact device, an upper and lower adjusting device and a junction box. When the measured medium pressure through the guide part into the measuring element, in which the pressure produces the corresponding displacement measuring element free end through the connecting rod drives the gear transmission mechanism, resulting in the dial on indication of the measured medium pressure value. At the same time, the instrument pointer drives the upper and lower limit movable arm and the set pointer (upper and lower limit) contacts to be disconnected or closed, so that the control circuit can be switched off so as to achieve the purpose of automatic control or sending letters to alarm.In general, the instrument can be used for automatic control or transmitting alarm by measuring and controlling the pressure system of the medium (or relay), which is used in conjunction with the corresponding electrical appliances (such as relays, contactors, etc.).

Q: Ytn10 and yn10 have these two types of pressure gauges? What do these two models stand for?: Yes, YTN10 said that YN10 stainless steel vibration proof pressure gauge, ordinary proof pressure gauge but you give these or not complete.

Q: How do you use this? How about two pointers? Don't use that kind of book. It's just as the saying goes, "take it step by step, how to use it. Thank you."!!!: Blue red yellow high, connected with a low voltage, connected with vacuum pump, blue red switch full open, vacuum pump work for 10 minutes, then the blue red switch closed, wait 10 minutes, see the table pointer has no change, no change can add refrigerant, the refrigerant pipe connecting the first yellow bottle. Che Zifa, the cold medium, yellow head spin open air open blue switch, will be added, such as pointer does not move, turn off the blue switch, air conditioning, open blue switch, with a good bottle, then turn off the blue switch, change the refrigerant, then how much should be.! The red tube switch is always closed! Remember!

Q: The working principle of the Bourdon tube pressure gauge: Bourdon tube pressure gauge is spring tube pressure gauge.Its working principle is that:The working principle of the spring tube type pressure gauge is spring tube; under the action of pressure, the free end displacement, the displacement of the rod drives the transmission amplification mechanism, the pointer deflection, and indicate the pressure value on the scale.Bourdon tube pressure gauge is mainly composed of a threaded joint holder, spring tube, rod, screw, gear sector, small gear, hairspring, pointer, upper and lower clamping plate, dial, case, shell etc..The function of each component in the drive amplifier mechanism:(L) pull rod - transfer the displacement of the free end of the spring tube to the sector gear;(2) the sector gear converts the line displacement to angular displacement and then passes it to the pinion and has an amplification effect;(3) the pinion drives the coaxial pointer to rotate, indicating the measured pressure on the dial;(4) - the gossamer fan gear and small gear tooth profile keep one-way contact clearance contact two gear, in order to reduce the return difference;(5) adjusting the screw - changing the position of the adjusting screw can change the length of the short arm of the sector gear, so as to change the drive ratio;(6) the upper and lower clamping plates fix the components together to form a set of transmission mechanisms.The drive mechanism, also known as the movement, is the heart of the pressure gauge. Its function is to enlarge the displacement of the free end of the spring tube so as to achieve the purpose of easy reading.

Q: What is the principle of setting the root valve of the pressure gauge? Which gauges need to set the root valve? Which pressure gauges do not need to set the root valve?: First, local pressure gauges (in the PID diagram of a component named PG) installation interface are flange, flange with general HG/T20615-2009 DN20, the minimum pressure rating to Class300, Class300 is higher than that of no special requirements and process piping class agreement. Flange pressure rating less than or equal to Class600 when using the RF process, the pressure level with RJ CLASS600. In the process of vertical pipe on the diaphragm type pressure gauge will require the use of a 90 degree bend flange pressure gauge of the nozzle surface into the vertical flange, and pipe insulation shall not collide, and the vertical direction for bolt and nut construction space. 3. outside the flange surface, within the flange 150mm, set aside the space required for the long 700mm instrument installation. Two, the general pressure transmitter pressure transmitter (in the PID diagram of a component named PT) installation interface are flange, flange with HG/T20615-2009 DN20, the minimum pressure rating to Class300, Class300 is higher than that of no special requirements and process piping class agreement. Flange pressure rating less than or equal to Class600 when using RF process, pressure rating >Class600 with RJ. Single flange pressure transmitter, flange nozzle adopts HG/T20615-2009 DN50, minimum pressure level is Class300, higher than Class300, no special requirements, and process piping level. Threaded interface flange pressure rating less than or equal to CLASS600 with RF when suddenly face we installed on the pressure gauge with the cut-off valve with DN15;

Q: 250MPa calendar force, 150MPa verification point when the step-up is 148MPa, when the buck is 149MPa, please tell me how to calculate the value of error, return error is how to count? Thank you: The pressure gauge common breakdown has following four points:1, the needle does not move. That is, when the pressure is raised, the indicator of the pressure gauge does not move.Cause analysis: Cock cock, not open; pressure gauge connection pipe or water pipe blockage; the pointer and the central shaft is loose or pointer stuck.2, pointer jitter.Cause analysis: hairspring damage; plug or trap local channel is blocked; both ends of a center shaft bending, two ends of the shaft rotation is not concentric.3, the pointer can not return to zero when there is no pressure.Analysis of reasons: spring tube permanent deformation, loss of flexibility; pointer and center axis loose or pointer stuck; plug, pressure gauge connecting pipe or water retaining pipe channel blocked.4 、 the instructions are incorrect and exceed the allowable error.Cause analysis: mainly due to the spring tube due to high temperature and overload or excessive deformation; gear wear loose; balance disorder; plug leakage.

Q: Does the pressure meter belong to the field of mechanics?: The pressure gauge shall be attached to the measuring instruments. The question itself is not clear. Maybe you can answer that:1) the result of the pressure gauge test is pressure, which of course belongs to the basic quantity of mechanical research;2) no matter what type of pressure gauge, its working principle requires the knowledge of mechanics to explain clearly;3) the principles of the common pressure gauges (including vacuum meters) are usually described in the course of fluid mechanics or related mechanics.

Q: What's the difference between diaphragm pressure gauge and diaphragm type pressure gauge?: Simply speaking, the most obvious difference is that the measuring element (elastic sensitive element). As the measuring element diaphragm with diaphragm, and the diaphragm meter with a spring in the header pipe as the measuring element, the diaphragm is only isolated transfer and not sensitive to.Therefore, the diaphragm table can achieve a relatively small range, usually the lowest to 1kPa, the maximum is usually 2.5MPa; and the diaphragm can achieve the range is the spring tube range, usually can be selected between the 0.1-40MPa

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