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Фрагмент инструкции
An optional 0-5VDC Input / Output Power Adapter Package is available for use with the FMA 3200/3400 Series. This consists of a power source (115VAC or 230VAC), a connection hub and two cable assemblies with pigtail (soldered wire) ends. This should be assembled as shown in the following diagram. Assembling a FMA 3215PWPower Adapter Package (the FMA 3223PW Power Adapter Package is similar) The RED connector should be inserted in the RED socket on the connection hub. The WHITE connector should be inserted in the WHITE socket on the connection hub. The cable with a RED connector provides the input signal. The RED wire of this cable 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 bare wire of this cable assembly is the input signal negative (ground) and should be connected to the negative (Ground) terminal of the voltage source. The cable with a WHITE connector provides the signal output. The WHITE wire should be connected to the positive terminal of the display, data acquisition system or voltmeter with an impedance of greater than 2.5 k. (kilo ohms). The bare wire of this cable assembly is the signal negative (ground) and should be connected to the negative (Ground) terminal of the display, data acquisition system or voltmeter. Caution: Avoid high voltage static discharges to the input signal connection. Do not short the output signal wires or allow them to contact the power wires at any time. DAMAGE WILL RESULT! M-4271/0707, pg. 13 of 26 C. Operation 1. Warm Up Before applying power to the unit check all tubing and electrical connections. Once correct installation is verified switch on the power. The unit should then be allowed to warm up for 5 minutes before gas pressure is applied. 2. Verification of Zero Flow through the unit should be stopped by sealing or capping the inlet of the controller. It is not adequate to only stop flow by turning off the gas supply or closing a valve as there may be a leak in the system. This would give a false reading. After 5 minutes, the zero should be stable when there is no flow through the unit. If after 10-15 minutes the output is still not zero volts (within ±0.05 volts) the unit should be adjusted as detailed in section C part 6. It should be noted that power supply voltage variations and changes in ambient temperature can have an effect on zero readings. 3. Flow Readings Each controller is factory calibrated for a specific flow range and gas (or gas mixture). The calibration gas and flow range are shown on the unit’s label and calibration certificate. By monitoring the voltage output signal it is possible to determine the flow rate of the gas. Units are configured so that an output signal of 5.0VDC is provided when the maximum flow (i.e. Full Scale flow) is passing through the unit. The output signal is linear and scaleable enabling calculation of flow rates with in the sensor’s range. For example: For a flow range of 0-500sccm: At 500sccm the output signal would be 5VDC If the output signal were 3.5VDC then the flow rate would be: 500 . 5 . 3.5 = 350sccm If the maximum flow rate is exceeded non-linear and inaccurate readings will result. Units may be used for gases other than the calibration gas. In this case a “K Factor” would need to be applied and a corrected value calculated using the following formula: M-4271/0707, pg. 14 of 26 Q1 / Q2 = K1 / K2 Q1 is the flow rate of the new gas Q2 is the flow rate of the original calibration gas K1 is the K factor of the new gas K2 is the K factor of the original calibration gas Q1 = (K1 / K2) Q2 If K2 is larger than K1 then linear results will only be achieved if the unit does not exceed 5(K1/ K2)VDC for the full scale output. Example 1 For a 0-200sccm unit calibrated for air the flow at 5.0VDC would be 200sccm. The K factor for air is 1. If the unit is used with Helium (K factor 1.454 relative to air) then the flow at 5VDC (i.e. the maximum flow) would be (1.454/1)200 = 290.8 sccm Example 2 For a 0-10.0 l/min unit calibrated for Argon the flow at 5.0VDC would be 10.0l/min. The K factor for Argon is 1.45. If the unit is used with Carbon Dioxide (K factor 0.74) then the flow rate 5.0VDC would be (0.74/1.45)10.0 = 5.10l/min The accuracy of readings using K factors is not as good as that achieved for the calibration gas. The accuracy obtained (typically ±3% for K factors similar to the calibration gas) depends on the gas being used and the flow rate. For a list of common K Factors see Section J. 4. Changing The Flow Rate Set-Point (Using An External Voltage Source) The required flow rate is selected by adjusting the set-point voltage. The normal control signal voltage is 0-5VDC with 0VDC corresponding to zero flow and 5VDC being equivalent to the maximum rated flow of the unit. This input is linear and scaleable allowing different flow rates within the range of the unit to be selected. For example: For a flow range of 0-50...
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