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Bailey 820 Replacements
NUSI 2300 Series Bailey 820 Replacement ModulesScientech's NUSI 2300 Series Modules

Scientech’s NUSI modules are form-fit-function replacements for the original Bailey modules.





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SBI2300-3695 Summer + Bias + Inverter
Replace Bailey 6623695

The SBI2300-3695 Summer + Bias + Inverter replaces the obsolete Bailey 6623695 summer + bias + inverter while retaining the identical functions of the Bailey module.

The SBI2300-3695 provides an output that is the algebraic sum of up to five input signals. An adjustable internal bias voltage is also connected as an input and can be used to add or subtract from the total input. This Module has an inverting circuit that may be used to invert the polarity of the Summer output or one of the inputs.

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TSR2300-3817 Tri-Stable Relay
Replace Bailey 6623817

The TSR2300-3817 Tri-Stable Relay replaces the obsolete Bailey 6623817 tri-stable relay while retaining the identical functions of the Bailey module.

The TSR2300-3817 is used to determine whether the difference between two input signals (±10 Vdc each) exceeds preset positive or negative relay switch points. If the difference voltage exceeds this error band setting, then an appropriate module relay actuates. A switched relay can provide contacts for control of a manipulated variable, alarms (visible or audible) or corrective system action to bring the difference signal back within the desired range. A difference signal falling between the two switch point settings causes no relay action. This Module accepts either normal (minus to plus) or reverse (plus to minus) polarity of the input (difference) signal and can operate with the relays either normally energized or normally de-energized.

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MON2300-3819 Signal Monitor
Replace Bailey 6623819

The MON2300-3819 Signal Monitor replaces the obsolete Bailey 6623819 signal monitor while retaining the identical functions of the Bailey module.

The MON2300-3819 monitors control system signal levels by comparing the input signals to internal set point levels determined by the positive and negative switch-point adjustments on the front plate. Input signals exceeding the set points cause the Signal Monitor relays to switch, providing contacts for alarm circuits or other subsystem circuits.

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SGM2300-3835 Signal Generator
Replace Bailey 6623835

The SGM2300-3835 Signal Generator replaces the obsolete Bailey 6623835 signal monitor while retaining the identical functions of the Bailey module.

The SGM2300-3835 can be configured via jumpers to produce one, two, or three outputs that previously required three different Bailey modules (Bailey 6623835-1, 6623835-2, and 6623835-3).The SGM2300-3835 produces one, two or three adjustable voltage outputs (±10 Vdc signal sources) for system control purposes, such as set point, bias, reference, etc., requiring 5 mA or less of load current.

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MUL2300-4080 Multiplier
Replace Bailey 6624080

The MUL2300-4080 Multiplier Module replaces the obsolete Bailey 6624080 multiplier module while retaining the identical functions of the Bailey module.

The MUL2300-4080 produces an output signal that is the product of two input signals. One input signal is labeled the primary input and the other is labeled the gain input. This Module is considered to be a variable gain amplifier because the primary input is essentially multiplied by the gain input.

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LAG2300-4120 Signal Lag
Replace Bailey 6624120

The LAG2300-4120 Signal Lag replaces the obsolete Bailey 6624120 signal lag while retaining the identical functions of the Bailey module.

The LAG2300-4120 provides a calibrated delay time between an input signal change and the output signal change. A rotary switch (time lag) and a pair of toggle switches (multiplier) on the front plate provide selection of signal lag time from 0 to 360 seconds.

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DER2300-4125 Derivative
Replace Bailey 6624125

TheDER2300-4125 Derivative replaces the obsolete Bailey 6624125 derivative while retaining the identical functions of the Bailey module.

The DER2300-4125 provides an output signal that is directly proportional to the time rate of change (derivative) of the input signal. The derivative of a constant is zero and thus the Module also provides for the output signal of the derivative to drop to zero volts at an exponential (RC) decay rate whenever the input signal stabilizes. A rotary switch (derivative) and toggle switches (multiplier) on the front plate are used to determine the proportional factor and the decay rate.

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SUI2300-4150 Summer + Integral
Replace Bailey 6624150

The SUI2300-4150 Summer + Integral replaces the obsolete Bailey 6624150 summer + integral while retaining the identical functions of the Bailey module.

The SUI2300-4150 combines in one module the two independent control actions of summing and integrating, and provides an output signal that initially assumes a value determined by the algebraic sum of the inputs, plus or minus bias if used. The output signal of the integral then changes at a time rate determined by the REP/MIN integral setting (repeats per minute of the input).This Module contains a Signal Limiter that imposes positive and negative voltage limits on the integral output.

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RLF2300-4200 Rate-Limited Signal Follower
Replace Bailey 6624200

The RLF2300-4200 Rate-Limited Signal Follower replaces the obsolete Bailey 6624200 rate-limited signal follower while retaining the identical functions of the Bailey module.

The RLF2300-4200 provides an output signal with a limited rate of change. It limits the maximum rate of change of the output signal when the rate of change of the input signal exceeds a preset limit. (This Module acts as a non-inverting signal follower when the rate of change of the input signal is within the preset limit.)

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LIM2300-4261 Signal Limiter
Replace Bailey 6624261

The LIM2300-4261 Signal Limiter replaces the obsolete Bailey 6624261 signal limiter while retaining the identical functions of the Bailey module.

The LIM2300-4261 receives a ±10 Vdc input signal and transmits it unchanged as an output, as long as the input remains within the voltage range bounded by the adjustable positive and negative limit settings. The output voltage range is determined by the positive and negative voltage-limiting adjustments on the front plate (both ±10 Vdc). When the input exceeds either limiting voltage, the output signal remains at the limiting voltage until the input returns within the voltage range.

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AMM2300-4520 Analog Memory
Replace Bailey 6624520

The AMM2300-4520 Analog Memory replaces the obsolete Bailey 6624520 analog memory while retaining the identical functions of the Bailey module.

The AMM2300-4520 is normally used with an Operator Interface Transfer Station. In automatic mode, the AMM2300-4520 functions as a signal follower. In manual mode, the AMM2300-4520 "remembers" the automatic signal value and maintains this value at the output.

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AUC2300-4543 2-Input Auctioneer
Replace Bailey 6624543

The AUC2300-4543 2-Input Auctioneer replaces the obsolete Bailey 6624543 auctioneer while retaining the identical functions of the Bailey module.

The AUC2300-4543 selects the more positive or more negative of two input signals depending on an internal jumper setting, and repeats that signal as an output. Combinations of Auctioneers can be used to select from any number of signal inputs; for example, the output of one Auctioneer can be used as an input to another Auctioneer to select the most positive or most negative of three signals, depending on internal switch settings.

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QBM2300-4610 Quad Buffer
Replace Bailey 6624610

The QBM2300-4610 Quad Buffer replaces the obsolete Bailey 6624610 quad buffer while retaining the identical functions of the Bailey module. The QBM2300-4610 consists of four identical channels that each may be configured through input and output jumpers to perform one of the following three functions:

Voltage buffer – this is used to filter a voltage input signal and transfer it with a unity gain as an output signal to another device in the system, and also to provide impedance type isolation for signals transmitted to other systems such as computers.

Current buffer – this accepts an input signal span of 4 Vdc (within a -1 Vdc to +8 Vdc limit) that can be developed from a current signal by using a range resistor mounted external to the Quad Buffer. This signal is filtered and converted to an output of ±10 Vdc. The input to the current buffer does not have to be referenced to system common, therefore requiring common mode rejection. Both buffer types also provide circuit isolation.

Voltage output converter – this accepts a ±10 or 10 V dc signal and converts it to a +1 to +5 V dc range.

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GEN2300-4665 Function Generator
Replace Bailey 6624665

The GEN2300-4665 Function Generator replaces the obsolete Bailey 6624665 function generator while retaining the identical functions of the Bailey module.

The GEN2300-4665 normally receives one input signal and produces an output signal that approximates a desired function curve by means of four straight line segments that each begin with a breakpoint. In some applications, a second input signal may be applied to the module as the input to one line segment. This module can approximate a wide variety of function curves, and variations are adjustable from the front plate and through jumpers on the circuit board. Two Function Generators may be connected to more accurately approximate a function curve.

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PSM2300-5070 Power Supply Monitor
Replace Bailey 6625070

The PSM2300-5070 Power Supply Monitor replaces the obsolete Bailey 6625070 power supply monitor while retaining the identical functions of the Bailey module.

The PSM2300-5070 monitors the output voltage levels of the 24 Vdc power supplies and the level of the system power busses. When used in an auctioneered redundant power supply system, the Module provides relay contact outputs indicating a normal (relay energized) or fault (relay de-energized) condition for: (1) the positive power supplies; (2) the negative power supplies; (3) the positive power bus; and (4) the negative power bus. Indicator lights associated with each relay are on during normal conditions or off during fault conditions. Each relay switch point is independently adjustable.

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PUL2300-5160 Pulser
Replace Bailey 6625160

The PUL2300-5160 Pulser replaces the obsolete Bailey 6625160 pulser while retaining the identical functions of the Bailey module.

The PUL2300-5160 receives a ±10 Vdc input error signal and converts it to modulated pulses that produce relay contact closures. The contacts provide continuity of circuits wired through the connector. The pulses driving the relays are also available as a module output. The percentage of pulse modulation is a function of the input error signal.

The PUL2300-5160 is used as an interface with electro-hydraulic governor motor controls. In this application, there is an appreciable time lag (five seconds in typical systems) before the effect of a valve position change can be fed back for further control action. As the controlled variable approaches the desired value, overshooting will occur if the positioning control is kept running during the delay period. The Pulser minimizes overshoot problems by applying a modulated actuation signal to the output device.

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VCC2300-5621 Voltage-to-Current Converter
Replace Bailey 6625621

The VCC2300-5621 Voltage-to-Current Converter replaces the obsolete Bailey 6625621 voltage-to-current converter while retaining the identical functions of the Bailey module.

The VCC2300-5621 receives a ±10 Vdc input signal and converts it to one of three dc output signals: +1 to +5 mA; +4 to +20 mA; or +10 to +50 mA. The current range is selected by jumpering pins at the module connector. The input signal can be normal polarity (-10 to +10 Vdc) or reverse polarity (+10 to -10 Vdc). A NOR/REV jumper (S1) on the printed circuit board (PCB) selects the desired sense of the output.

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SPI2300-9530 Summer + Proportional + Integral
Replace Bailey 6629530

The SPI2300-9530 Summer + Proportional + Integral replaces the obsolete Bailey 6629530 summer + proportional + integral while retaining the identical functions of the Bailey module.

The SPI2300-9530 performs the two independent functions of summing and integrating, which are usually used together. The Summer section consists of a four-input summing amplifier that provides a system output directly proportional to the algebraic sum of the inputs. An internal bias voltage is also connected as an input to the Summer. The bias may be used to add to or subtract from the total input sum, and can also be an internal set point.

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SBI2300-9536 Summer + Integral
Replace Bailey 6629536

The SBI2300-9536 Summer + Integral replaces the obsolete Bailey 6629536 summer + integral while retaining the identical functions of the Bailey module.

The SBI2300-9536 combines two independent control actions, summing and integrating, in one module and provides an output signal that initially assumes a value determined by the algebraic sum of the inputs, plus or minus bias if used. The output signal of the integral then changes at a time rate determined by the REP/MIN integral setting (repeats per minute of the input).The SBI2300-9536 contains a Signal Limiter that can impose positive and negative voltage limits on the integral output. The limit levels are controlled by external signal inputs to the Limiter section.

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