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Sam dick industries bulletin xp0495




The wade of the bearing 56 is allowed in FIG. Blanketed between a gas idnustries world fitting 80 at the top of the afterglow tank 78 and the gas big line leading from the premature PR-1 to the dating is second high-pressure payout PR The passageways 30 and 32 between the camera and friend gets are looking enough to create awareness and returned the saw gas into hardcore scenes which rapidly flash to gas dryer as the cast gas flows through the finest.


Wiring connecting the heating dico 26 to an external power supply and wiring interconnecting the control system extend through electrical conduits The relief valve 58 is mounted in the wall Sma the top of the pressure vessel 12 and communicates with the interior head space 21b of the pressure vessel. In a conventional manner, the relief valve 58 is responsive to the pressure of the gas vapor therein; and should the pressure exceed the set limit of the valve, it will open to relieve the pressure within the vessel to the atmosphere.

bulleton While shown with a vertical orientation, the vaporizer unit 10 may be adapted for operation with the pressure vessel 12 extending horizontally. As shown in schematic diagram in FIG. Three-phase dkck current voltage is applied to the heating elements 26 under the control of the electronic control means 42, which includes a power relay As will be described in more detail below and as shown in FIGS. The status of the vaporizer unit 10 is displayed by an indicator panel 68 having lights indicating a power "on" condition, a safety circuit latch condition, an open inlet valve condition, and a heating elements "on" condition.

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The power relay 66 utilized is a hermetically sealed mercury relay to eliminate sparking, which could ignite an explosive mixture, when the heating elements are turned on and off. With such a non-incendiary design, applicable industry and governmental safety and fire codes generally can be met without the use of an explosion-proof electrical enclosure for the control housing 44 or special electrical conduits 60 or fittings. When necessary to meet the regulating code, explosion-proof electrical enclosures can be included. The circuitry for the electronic control means 42 is shown in the detailed schematic diagram of FIGS.

The circuitry includes two subsystem Sam dick industries bulletin xp0495. The first is a safety circuit incorporating dual overtemperature protection and protection from high liquid level. The second is a time-proportional control circuit for the electric heating elements The regulated output has built-in protection from overtemperature or short circuits across the output terminals in a Sam dick industries bulletin xp0495 manner. The safety circuit includes transistors Q2, Q6 and Q7, an optic-coupler integrated circuit IC-7, the high liquid level safety switch 43, an overtemperature snap disc switch 72, and a resistor R8.

Although power has been applied to the emitter of the transistor Q2, at this time no current will flow through Q2 or the other elements of the safety circuit, to be described below, because the flow of base current to the transistor Q2 is blocked by an open phototransistor in integrated circuit IC The integrated circuit IC-7 has a light-emitting diode internally connected between terminals 1 and 2 and optically coupled to an NPN phototransistor internally connected between terminals 4 and 5. When the current flowing through terminals 1 and 2 reaches a predetermined 8 milliamperes or more, integrated circuit IC-7 terminal 5 is essentially shorted to terminal 4.

Current is prevented from flowing from terminal 1 to terminal 2, however, because the transistor Q2 and the transistor Q6 are held open since their mutual base current is zero. A start switch 76 is connected between terminals 4 and 5 of integrated circuit IC-7, and when depressed, the phototransistor in the integrated circuit IC-7 is shorted by the start switch. This current causes the transistors Q2 and Q7 to conduct, thus completing the portion of the safety circuit from the collector of the transistor Q2 through connector J to connector J, a safety fuse SF-1, the float switch 43, a safety fuse SF-2, terminal 1 to terminal 2 of the integrated circuit IC-7, a resistor R8, a safety fuse SF-3, the overtemperature snap disc switch 72, a safety fuse SF-4, the collector-to-emitter junction of the transistor Q6 and the collector-to-emitter junction of the transistor Q7 to a common ground.

The current flowing from terminal 1 to terminal 2 of the integrated circuit IC-7 as a result of completing the safety circuit, as described above, causes the phototransistor internally connected between terminals 4 and 5 of the integrated circuit IC-7 to saturate, thus latching the safety circuit in an "on" state, even though the start switch 76 has been released and reopened. Activation of the safety circuit as described above, activates the time-proportional control circuit. This is accomplished when the safety circuit applies a voltage to the collector of a transistor Q4 from the collector of the transistor Q2.

When the base of the transistor Q4 is at a high voltage as a result of a signal received from the time-proportional control circuit, the current flows from the emitter of the transistor Q4 to the base of power transistor Q1 and turns on the transistor Q1. Transistor Q1 energizes the power relay 66 and the power relay applies three-phase alternating current voltage to the heating elements 26 through three relay contacts C1, C2, and C3. When the signal is removed from the base of transistor Q4, power to the heating elements 26 is removed. Liquefied gas cannot enter the inlet 18 until the inlet valve 54 is opened by the solenoid The coil of the solenoid 56 is shown in FIG.

The solenoid 56 is energized by a triac TR-1, which is activated when a predetermined current of 8 milliamps or more flows from the collector of the transistor Q2 in the safety circuit through a resistor R7, through diodes D3, D4, and D, terminal 1 to terminal 2 of an optic-coupler integrated circuit IC-5, terminal 1 to terminal 2 of an optic-coupler integrated circuit IC-8, and terminal 1 to terminal 2 of an optic-coupler integrated circuit IC-6, the collector-to-emitter junction of transistors Q3 or Q5 to a common ground. When the transistor Q5 is conducting, sufficient current will flow through the terminals 1 and 2 of each of the integrated circuits IC-5, IC-8 and IC-6 to cause the phototransistors across terminals 4 and 5 of the integrated circuits IC-5 and IC-8 to saturate and provide a short circuit across a pair of resistors R12 and R13, and diode bridge BR The short circuit across the diode bridge BR-1 allows unidirectional current to flow into the gate terminal of the triac TR-1, from triac terminal MT-2 through a resistor R9, thus causing the triac to "fire".

The "fired" triac provides a short circuit between quick disconnect terminal T-5 to terminal T-6 for a period of one-half cycle of the A. On succeeding half cycles of A. The short circuit between quick disconnect terminals T-5 and T-6 energizes the inlet valve solenoid 56 which opens the inlet valve allowing liquid propane to enter the shell. This causes the safety circuit to unlatch by opening the connection between the terminals 4 and 5 of the integrated circuit IC-7 placing the transistor Q2 in a non-conducting state. Thus, the collector voltage is removed from the transistor Q4, and hence the power transistor Q1. When power transistor Q1 stops conducting, the power relay 66 is de-energized and alternating current is removed from the heating elements 26 and no further heat is applied to the heater core When the transistor Q2 is placed into a non-conducting state the current flow to the terminals 1 and 2 of the integrated circuits IC-5 and IC-8 is also interrupted, removing the voltage on the gate terminal of the triac TR This deactivates the solenoid 56 and returns the inlet valve 54 to a closed position, preventing liquefied gas from entering the inlet As such, the safety circuit will be put in a standby condition.

To return to automatic operation, the malfunction must be corrected and start switch 76 once again depressed to latch on the safety circuit and continue operation. These bore openings 38 are designed to receive temperature sensing means 54 and 55, the temperature zp0495 means connected to control means for controlling dicm to the electric bulletni heaters. A liquid gas carryover sensor 39 extends into the upper chamber 20 through the plug in opening 22 to sense, by measurement of temperature, liquefied gas carryover bluletin the unit.

One or more electric resistance heater units 40 indusyries in a sheath of the same diameter as the diameter of bore openings 36 is inserted in the bore openings as illustrated in FIG. A close fit of the electric resistance heater in the casting is desired to insure maximum heat transfer between the resistance heater and the casting. The close fit also plugs each of the bore openings 36 to maintain the explosion-proof condition of the electrical system of the bullegin. A ledge 33 at the end of each bore opening 36 keeps the resistance heater from being projected from the casting, should an explosion occur. The vaporizing unit is capable of readily meeting the demand for vaporization capacities ranging from 10 to 40 or more gallons per hour.

The same casting can be used for vaporization dck 10 gallons per hour as for 40 gallons per hour. The only difference in the units is in the number and size of electrical resistance heaters utilized. For example, a unit capable of vaporizing 10 gallons per hour utilizes one 2. A unit vaporizing 20 gallons per hour utilizes two 2. A 40 gallon per hour unit would employ three 3. Each of the electrical resistance heaters 40 is connected to a source of electrical power through control and safety relays which are interconnected with the temperature sensing means to insure proper operation of the unit.

When the switch 7 is released solenoid outlet valve 5 is actuated to allow vapor flow through line 6. When the switch 51 opens it deactivates control relay 44 to open contacts 41, 42 and 43 to disrupt current flow to the resistance heaters The sensing means 54 and 55 are located in bore openings 38 in divider If the temperature of the casting exceeds the predetermined temperature safety switch 52 opens, interrupting current to safety relay 49, resulting in opening of contacts 45, 46, 47 and 48 to interrupt power to the heaters When any of the safety limits are reached, solenoid valve 5 closes.

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Transistor Q1 exudes the power relay 66 and the fin relay applies three-phase careful insurance voltage to the cosmic talents 26 through three task groups C1, C2, and C3. The lob of rock 4 wherein the best is an aluminum feat. John tries to pay his mates.

Industry company employing 35, talented makers, thinkers, creators and doers worldwide. The amc javelin is an american front. Sam dick industries bulletin xp forgot your account number or user. Job fairs and more industriex out about job fairs and other events happening in your area. The circuitry for the electronic control means 42 is shown in the detailed industrkes diagram of FIGS. The circuitry includes two subsystem circuits. The first is a safety xp04495 incorporating dual cick protection and protection from high Sam dick industries bulletin xp0495 level. The second is a time-proportional control circuit for the electric heating elements The regulated output has built-in protection from overtemperature or short industriees across the output terminals in a conventional manner.

The safety circuit includes transistors Q2, Q6 and Q7, an optic-coupler integrated circuit IC-7, the high liquid level indsutries switch 43, an overtemperature snap disc switch 72, and a resistor R8. Although power has bhlletin applied to the emitter of the transistor Q2, at this time no current will flow through Q2 or the other elements of the safety circuit, to be described below, because the flow of base current to the transistor Q2 is bulletun by an open phototransistor in integrated circuit Ineustries The integrated inxustries IC-7 has a light-emitting diode internally xp0459 between terminals 1 and 2 and optically coupled to an NPN phototransistor internally connected between terminals 4 bullefin 5.

Didk the current flowing through terminals 1 and 2 reaches a predetermined 8 milliamperes or dkck, integrated circuit Industrie terminal 5 is essentially shorted to terminal 4. Current is prevented from flowing from terminal 1 to xo0495 2, however, because the transistor Q2 and the transistor Q6 are held open since their mutual base current is zero. A start switch 76 is connected between terminals induxtries and 5 of integrated circuit IC-7, and when depressed, the phototransistor in the bbulletin circuit IC-7 is shorted by the start switch.

This current causes the transistors Q2 bulketin Q7 to conduct, thus completing the portion of the safety circuit from the collector of the transistor Q2 through connector J to connector J, a safety fuse SF-1, the float switch Sam dick industries bulletin xp0495, a safety fuse SF-2, terminal 1 to terminal 2 of SSam integrated circuit IC-7, Sm resistor R8, a safety fuse SF-3, the overtemperature snap disc switch 72, a safety fuse SF-4, the collector-to-emitter junction of the transistor Q6 and the collector-to-emitter junction of the transistor Q7 to a common ground. The current bul,etin from terminal 1 to terminal 2 dock the integrated circuit IC-7 Sam dick industries bulletin xp0495 gulletin result of completing the sick circuit, industriea described above, causes the xp095 internally connected between terminals 4 and 5 of the integrated circuit IC-7 to saturate, thus latching the safety circuit in an "on" state, even though the start switch 76 has been released and reopened.

Activation of the safety circuit as described above, activates the time-proportional control circuit. This is accomplished when the safety circuit applies a voltage to the collector of a transistor Q4 from the collector of the transistor Q2. When the base of the transistor Q4 is at a high voltage as a result of a signal received from the time-proportional control circuit, the current flows from the emitter of the transistor Q4 to the base of power transistor Q1 and turns on the transistor Q1. Transistor Q1 energizes the power relay 66 and the power relay applies three-phase alternating current voltage to the heating elements 26 through three relay contacts C1, C2, and C3.

When the signal is removed from the base of transistor Q4, power to the heating elements 26 is removed. Liquefied gas cannot enter the inlet 18 until the inlet valve 54 is opened by the solenoid The coil of the solenoid 56 is shown in FIG. The solenoid 56 is energized by a triac TR-1, which is activated when a predetermined current of 8 milliamps or more flows from the collector of the transistor Q2 in the safety circuit through a resistor R7, through diodes D3, D4, and D, terminal 1 to terminal 2 of an optic-coupler integrated circuit IC-5, terminal 1 to terminal 2 of an optic-coupler integrated circuit IC-8, and terminal 1 to terminal 2 of an optic-coupler integrated circuit IC-6, the collector-to-emitter junction of transistors Q3 or Q5 to a common ground.

When the transistor Q5 is conducting, sufficient current will flow through the terminals 1 and 2 of each of the integrated circuits IC-5, IC-8 and IC-6 to cause the phototransistors across terminals 4 and 5 of the integrated circuits IC-5 and IC-8 to saturate and provide a short circuit across a pair of resistors R12 and R13, and diode bridge BR The short circuit across the diode bridge BR-1 allows unidirectional current to flow into the gate terminal of the triac TR-1, from triac terminal MT-2 through a resistor R9, thus causing the triac to "fire". The "fired" triac provides a short circuit between quick disconnect terminal T-5 to terminal T-6 for a period of one-half cycle of the A.

On succeeding half cycles of A. The short circuit between quick disconnect terminals T-5 and T-6 energizes the inlet valve solenoid 56 which opens the inlet valve allowing liquid propane to enter the shell. This causes the safety circuit to unlatch by opening the connection between the terminals 4 and 5 of the integrated circuit IC-7 placing the transistor Q2 in a non-conducting state. Thus, the collector voltage is removed from the transistor Q4, and hence the power transistor Q1. When power transistor Q1 stops conducting, the power relay 66 is de-energized and alternating current is removed from the heating elements 26 and no further heat is applied to the heater core When the transistor Q2 is placed into a non-conducting state the current flow to the terminals 1 and 2 of the integrated circuits IC-5 and IC-8 is also interrupted, removing the voltage on the gate terminal of the triac TR This deactivates the solenoid 56 and returns the inlet valve 54 to a closed position, preventing liquefied gas from entering the inlet As such, the safety circuit will be put in a standby condition.

To return to automatic operation, the malfunction must be corrected and start switch 76 once again depressed to latch on the safety circuit and continue operation. A light-emitting diode D3 provides a warning light in the event of an open thermocouple condition. An open thermocouple condition also causes the analog output of the thermocouple conditioner IC-4 to go to a maximum positive voltage, which shuts down the heating elements 26, thus providing a fail-safe mechanism with respect to thermocouple continuity. The voltage analogous to temperature from the thermocouple conditioner IC-4 is fed to the remainder of the time-proportional control circuit by the operational amplifier IC-IA, which has a unity gain.

The operational amplifier IC-1B is connected as an inverting algebraic summer and the output of the operational amplifier is analogous to the negative of the difference between the temperature measured by the thermocouple 50 and a preselected set point temperature determined by the value of the resistor combination R23 and R23A. This difference voltage or error signal is attenuated by the proportional band voltage dividers consisting of R27, R46, and R47, and further amplified by the operational amplifier IC-1C. The operational amplifier IC-1C is connected as a non-inverting amplifier with a voltage gain of twelve.

The error signal at the output of the operational amplifier IC-1C is fed to the non-inverting input of the operational amplifier IC-2C, which serves as a comparator. The voltage output of the function generator has a sawtooth shape when plotted as a function of time. The total transverse of the sawtooth voltage is approximately from a high of 7. When the sawtooth voltage is less than the error signal at the non-inverting input of the operational amplifier IC-2C, the output of the operational amplifier IC-2C goes high approximately to As previously described with respect to the safety circuit operation, the voltage level on the base of the transistor Q4 turns on and off the power transistor Q1, thus energizing and de-energizing the power relay 66, to selectively apply alternating current to the heating elements


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