Trip amplifiers

Trip amplifiers with facilities to wire back alarms to the control room. Terminals for cables from thermocouples,... 

Aeration was controlled at one of three rates by connecting either a dissolved oxygen (DO) or redox electrode, as appropriate (Section 2.4), to a meter containing a trip amplifier. The trip amplifier operated at two set points and switched two solenoid valves to allow the entry of air at a high or low flow rate through a pipe that emerged under the... 

Externally, the only difference between this Ex i-isolator (Fig. 6.207) with galvanic isolation and a safety barrier is its increased size. The complex electronics and, of course, the components limiting current and voltage are hidden inside. In this example, a trip amplifier for DIN rail mounting is shown, which is suitable for operating temperature sensors in intrinsically safe circuits. The marking is ... 

CONTROLS INSTRUMENTATION IV ELECTRONIC AND RELAY SCRAMS TRIP AMPLIFIER... 

An altouative solution might involve two sets of relays (300 in each) and analogue trip amplifiers (40), performing the same tasks as the PLCs above, having some limited ctq)ability for fault detection. 

Principle of the trip amplifier as an input converter to the relay logic... 

EMI and RFI immune. Needs trip amplifiers for analog signals Prone to failures and RFI. 

Panel mounted trip amplifiers or field mounted current/voltage alarm trip devices have been used for many years in safety systems to convert analog signals from transmitters to... 

Panel based trip amplifiers are designed to have a good safe failure fraction and are well accepted for use with relay based trip systems. Trip amplifiers are normally specially designed to have a high level of immunity to RFI disturbances and have programmable responses to sensor failures and to some internal failures. 

Trip amplifier for interfacing an analog transmitter into the logic solver... 

This diagram shows a typical trip amplifier arrangement. Note how retransmission facilities are provided for the analog signal. This allows the signal to be copied to a control room interface or to a DCS without adding complexity (and hence failure potential) to the input signal loop. 

Panel based trip amplifiers As above. Responses to sensor failure modes are configurable High or low. Also affected by power siq ly failures. Beware of RFI problems causing spurious trips. 

Three temperature transmitters are provided, each of which transmits to a trip amplifier device that acts as a high temperature trip device. 

The wave is amplified if the gain overcomes the losses per round trip that is,... 

The electronic instrumentation necessary for the operation of the proportional counter is shown in Figure 18.6. Pulses from the detector pass through a preamplifier and amplifier, where they are shaped and amplified. Emerging from the amplifier, the pulses go to a discriminator. The discriminator is set so as not to trip on noise pulses but rather to trip on radiation pulses of any larger size. The number of discriminator pulses produced is recorded by the scaler. 

Figure 6.10 Frequency response of a SAW delay line, showing both the magnitude (solid curve, left ordinate) and phase (dotted curve, right ordinate) of the transmitted signal as a function of excitation frequency. The upper horizontal line represents a gain of 2S dB from a hypothetical amplifier used in constructing an oscillator loop the lower horizontal line represents zero phase shift (or any integral multiple of 2ir). The three points indicated on the frequency curve by filled circles indicate the frequencies at which the two conditions necessary for loop oscillation are satisfied less insertion loss than the gain of the amplifier, and a round-trip phase shift of zero.

We should view an oral presentation as amplified conversation. Suppose that you walk up to two friends who are talking. One of them asks the other, Jan, to tell about her recent trip to the Amazon rain forest. You both become engrossed in Jan s account and start doing more listening than talking. Another person joins the discussion, then another, then two more. A few more people see the group and join. Eventually someone asks Jan whether she has pictures from her trip. Jan steps into her office, brings out some pictures, and refers to them as she talks. 

A relay tripping circuit has been proposed by Manufacturing to eliminate the use of the electronic amplifier Ich exhibits non-fail—safe characteristics. This relay circuit is stxggested... 

A Monitron is an iohiiation chamber and amplifier device which trips a relay when the ionizing radiation failing upon it exceeds a predetermined level. 

The optimum gain for the dye-laser pulses is achieved if they arrive in the active medium (dye jet) at the time of maximum inversion AN(t) (Fig. 6.15). If the optical cavity length d2 of the dye laser is properly matched to the length d of the pump laser resonator, the round-trip times of the pulses in both lasers become equal and the arrival times of the two pulses in the amplifying dye jet are synchro-... 

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