Answer Posted / jahid
Every application requires selection of the right type of
component and shaft/bushing configuration.
Whether the component is a precision potentiometer, panel
control or rotary encoder, selection of the
right shaft/bushing configuration will yield the optimum
performance of the component in its
intended application.
There are two general categories of applications that should
be considered when selecting a component. These categories
are Human-to-Machine Interface (HMI) and Machine-to-Machine
Interface (MMI).
HMI applications commonly appear on the front panel of an
application as manual adjustments. These
devices are typically mounted to a panel (as shown in Figure
1) with a sleeve bushing and have a knob
mounted on the end of the shaft. In these applications, high
speed of rotation and shaft side load are
normally not encountered. On some models, a sleeve bushing
is available with front ball bearings
should the designer wish to have a very low shaft torque, or
front and rear ball bearings for
applications where the shaft will likely encounter up to 0.5
oz of side load due to an oversized knob or
other similar design factors.
Many MMI applications are position sensors where adjustments
will be made by mechanical interface.
Position sensor designs include hospital beds, dental
chairs, fluid control valves, elevators, automatic
doors and lift trucks. These sensors can also be used to
count rotations of a motor via a mechanical
coupling device. In MMI applications, a high speed of
rotation may be encountered along with a shaft
side load exerted by either a pulley or gear system. For
these applications, the front ball bearing option
or front and rear ball bearing option and servo mount
configuration (as shown in Figure 2) is highly
recommended.
Configurations made for MMI applications may be used in HMI
applications where the designer
would like the additional robustness and extended rotational
life. However, configurations made for
HMI applications are not recommended for use in MMI applications
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling
What are different type of instrument cable
what is piezoelectric transducer?give an example in power plant n state its principle?
What is the difference between modbus,fieldbus & profibus
we are using centum vp as monitoring with Dell precision work station T3600 but some times PC(s) are restarted automatically . how we can solve this problem? thanks
ORP sensor working principle?
What are the error values can accepted in flow transmitter calibration?could u give any formula for this?
Instrumentation Safe Guarding test. How to determine the interval time of the test. eg:Halfyearly,Every year,Every three years etc.
What is difference of fanuc alpha series 16i and 18i controller.also what is differnce betn TC and MC controller
How we calculate orifice plat size???
Give an example where you had aproblem on the job, and tell me how you solved the problem. and the finalvoutcome.
how to calibrate steam control valve in steam turbine
How is automatic reference junction compensation carried out in temperature recorders?
How RAL(Rotary air lock)works in cement industry?
There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?
