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M-4271/0707, pg. 6 of 26 2. Mounting the Flow Controller. The FMA 3200/3400 Series controllers have no particular orientation or installation requirements so may be mounted in any convenient position. It is recommended that units be fixed to a suitable substrate using the two 4-40 mounting holes provided. Mounting View from Bottom (mounting hardware not includedwith sensor) 3. Tubing Connections All tubing must be clean, dry and purged with clean dry air before installation of the FLO-CONTROLLER®. If the gas to be used may contain particles then a filter (20 microns or less) should be installed upstream of (before) the unit. When connecting the sensor to the tubing, take care not to over-tighten the fittings or leaking may occur. Caution: Only use the fittings factory installed on the unit. If the fittings are removed the calibration of the unit may be effected and leaking may occur. If different fittings are required please contact the Omega Engineering Customer Service Department for assistance. M-4271/0707, pg. 7 of 26 4. Electrical Connections Caution: Incorrect wiring may cause severe damage to the unit. Applying an AC voltage (115VAC or 230VAC) directly to the unit will cause damage. Read the following instructions carefully before making any connections. a) Overview The FMA 3200/3400 Series provides a 0-5VDC analog output proportional to the flow rate. This output may be connected to a display, data acquisition system or voltmeter with an impedance of greater than 2.5 k. (kilo ohms). The flow controller needs to be supplied with a 0-5 VDC set point signal to enable control. On the FMA 3400/3400ST Series this may be generated internally by altering the set-point potentiometer on the front panel of the unit. A stable D.C. power supply is required to operate the unit. The voltage and current requirements depend on the configuration of the unit. Full details may be found in the Specification section of this manual. Connecting wires should be as short as possible to avoid voltage drops. Twisted conductor cable should be used if the length of the wiring is to be longer than 2 meters. Units are supplied with either a 6 pin mini DIN type connector (requires mating cable assembly), a 9 Pin D Sub connector or 15 Pin D Sub connector. Caution: Cutting off the integrated connectors on the unit IS NOT RECOMMENDED and will void the product warranty. Mating cables should be ordered along with each unit. Electrical connections to the units are made as detailed in the following sections. M-4271/0707, pg. 8 of 26 b) Connecting The 6 Pin Mini Din Connector Using a suitable mating connector the pins of the integrated connector should be wired as follows: Connecting To The Integrated 6 Pin Connector Pin Out of Integrated Connector Pin 2 should be connected to the Positive of the power source. Pin 6 should be connected to the Negative (Ground) of the power source. Pin 3 provides the signal output and should be connected to the positive terminal of the display, data acquisition system or voltmeter. Pin 1 is the signal negative (ground) and should be connected to the negative (Ground) terminal of the display, data acquisition system or voltmeter. Pin 4 provides the input signal and should be connected to the positive terminal of the voltage source. The (0-5VDC) voltage control signal should be supplied from a low impedance source. Pin 5 is the input signal negative (ground) and should be connected to the negative (Ground) terminal of the voltage source. Caution: Avoid high voltage static discharges to the input signal connection. Do not short the input/output signal wires or allow them to contact the power wires at any time. DAMAGE WILL RESULT! M-4271/0707, pg. 9 of 26 c) Connecting The 6 Pin Mini Din Connector & FMA 3000C Cable The two mating connectors should be pushed together and the pigtail leads wired as follows: Connecting To The Integrated 6 Pin Connector UsingAFMA 3000C Cable The RED wire should be connected to the Positive of the power source. The BLACK wire should be connected to the Negative (Ground) of the power source. The ORANGE wire provides the signal output and should be connected to the positive terminal of the display, data acquisition system or voltmeter. The BROWN wire is the signal negative (ground) and should be connected to the negative (Ground) terminal of the display, data acquisition system or voltmeter. The YELLOW wire provides the input signal and should be connected to the positive terminal of the voltage source. The (0-5VDC) voltage control signal should be supplied from a low impedance source. The GREEN wire is the input signal negative (ground) and should be connected to the negative (Ground) terminal of the voltage source. The wire colors above describe the pigtail leads of the FMA 3000C cable assembly and may not correspond with the internal wiring of your flow sensor. Caution: Avoid high voltage static discharges to the input signal connection. Do not short the input/output signal wires o...
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