Digital pressure gauge

Figure 8.1 Mechanical electrochemistry measurement equipment 1-adjuster of rotation speed 2-model 273 3-plank 4-high speed motor 5-opposite electrode 6-reference electrode 7-digital pressure gauge 8-lift platform 9-medium 10-resin mattress 11-electrolytic cell 12-working electrode...

The temperature was indicated and controlled to 0.1°C with a platinum resistance probe which extended 1 mm inside the inner surface of the cell. The pressure was adjusted using a 100 cc Ruska syringe pump and was measured to within 0.1% with a 710A Heise digital pressure gauge which is traceable to an NBS standard. The pressure varied less than 0.15 bar (2 psi) during a spectral scan. The wavelength accuracy was 0.2 nm for the Varian (Cary) 2290 spectrophotometer. 

A digital pressure gauge that reads both vacuum and pressures to 30 psig. 

The ARC is controlled by its own hardwired control module. The temperature is monitored by a set of seven thermocouples connected in series which measure the difference between the temperature of the sample and that of its surroundings. The temperature is maintained by heaters which receive their inputs from the control module. A pressure transducer is attached to the sample container, giving both an analog readout on a pressure gauge and a digital readout on the control module panel. It should be noted that pressure is monitored but it is not part of the control loop. 

Referring to Fig. 6.7, place an easy-to-read pressure gauge in the position shown. I like to use a digital gauge. 

This is dependent upon the accuracy to which a human observer can read an analog record of the output of the instrument in question, or how closely an indicator marking a particular position on a scale can be read. For example, can a particular pressure gauge be read to the nearest 0.1 kPa, to the nearest 1 kPa, or to the nearest 10 kPa It is important to consider this carefully when presented with data from an instrument with a digital output where the readability will be the same over the whole range of the instrument. In many cases the data obtained are only as precise as those indicated in the analog form. 

Fig. 2.4. Schematic view of the modular capillary electrochromatograph with a 90 kV dual power supply and pressurisable chambers for column inlet en outlet (reproduced from Ref. [26] with permission of the publisher). 1, 60 kV power supply 2, 30 kV power supply 3, digital electrometer 4 and 5, electrodes 6 and 7, reservoir for mobile phase or the sample 8, pressurisable chambers 9, packed capillary column 10, cell for on-column detection 11, detector 12, four-port two-way valve 13, four-port three-way valve 14, pressure gauges 15, from nitrogen cylinder 16, vent 17, ground.

Figure 1. In-situ FTIR catalyst light-off temperature measurement system. 1. compressed air 2. mass flow controller 3. gas lecture bottle 4. MKS pressure gauge 5. exhaust 6. IR cell 7. IR window 8. catalyst sample 9. thermocouple 10. sample compartment of Nicolet FTIR Model 60SX 11. chart recorder 12. digital thermometer display.

Cheap and capable digital web-cameras and microscopes. These make possible surveillance of experiments and their display on computer monitors. Simple and intuitive analogue instruments, such as bulb thermometers and bourdon-tube pressure gauges, may also be monitored web cameras. 

Instrumentation pressure gauges for steam and lubricating oil, bearing temperature indicator, electrical panel instruments (voltmeter, ammeter, KW, KWH, frequency meter, etc.). Tachometer with digital remote indication, running time totaliser. 

Consideration should be given to alternative methods of pressure measurement that may provide greato safety than the direct use of pressure gauges. Such methods include the use of seals or other isolating devices in pressure tap hues, indirect obsa-vation devices, and remote measurement by strain-gauge transducers with digital readouts. 

Figure 4. Setup for high-pressure dielectric measurements G, supply for pressurising gas V, valves M, pressure gauge GMK, gas compressor TM, heating and cooling jacket T, T, thermocouples B, Bridgman piston A, autoclave K, capacitor I, electrical connection to heating block Pt, platinum resistance thermometer DVM, digital voltmeter S, recorder HP, Hewlett-Packard impedance analyzer C, computer R, Rj, regulators TMG, temperature registration DW, dewar.

The voltage across the current sensing resistor is converted to digital by the 10-bit ADC built in MSP430F2012 microcontroller, where internal 1.5V reference voltage was used for the conversion. At the same time the air pressure in cuff was measured by an analog air pressure gauge (Welch Allyn CEO 123) to get the absolute air pressure in cuff. With... 

Various microdevices, that is, MEMS products, have also found applications in various consumer products, that is, sport shoes with automatic cushioning control, digital tire pressure gauges, smart toys, washers with water-level controls, and so on. 

Figure 1j Schematic representation of the reactor in a flow diagram used. (1) Gas cylinders, (2) pressure regulators, (3) needle valves, (4) valves, (5) mass flow controllers (MFCs), (6) digital pressure controllers, (7) pressure Gauges, (8) nonreturn valves, (9) ball valves, (10) tubular furnace, (11) temperature indicators, (12) tubular reactor and catalyst bed, (13) condenser, (14) trap, (15) air pump, (16) silica gel column, (17) gas chromatograph (GC), (18) mixing chamber, (19) (BPR) back pressure regulator (electronically type), (20) control panel (CP).

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