Pressure

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<strong>Pressure</strong> transmitters 77 Type series SN 3 Setting the operating range, testing Preliminary remark: The transmitters are carefully set in the factory to the nominal range. If the operating range is changed to different values, the guaranteed accuracy no longer applies. The attainable accuracy depends, among other things, on the care taken during adjustment. Warm up the device before making adjustments. Accurate settings are only possible with the device at operating temperature; therefore connect the power supply approximately 10 minutes before starting to make adjustments. Setting operations must be carried out in the correct sequence 1. Apply minimum pressure PA to the sensor and set the output signal to 0 V or 4 mA with potentiometer 1. 2. Apply maximum pressure PE to the sensor. Set output signals to 10 V / 20 mA with potentiometer 2. 3. Check the settings. Important: Always set the zero point with potentiometer 1 first, then set the amplification (end of range) with potentiometer 2. For inversion of the output signal, operate slide switch INV and repeat the setting procedure in the same way. Inversion is only possible on 3-conductor systems. The plug-in digital display AZ facilitates accurate setting Digital display AZ 331 (additional module) can be very useful for setting operating ranges which differ from the nominal range. The digital display (factory setting 0–10 V) plugs into the connector 6 and shows the output signal continuously during the setting process. Device arrangement for calibration and testing from outside the system To check functioning or change the settings from outside the system, a test set-up is required which meets the following requirements: 1. It must be possible to apply pressure to the pressure transmitter up to the desired final value. The pressure must be displayed by a sufficiently accurate pressure gauge. 2. To display the output signal a voltmeter with a measuring range of 0–10 (preferably 0–15 V) or an ammeter with a display range of 0–20 mA (preferably 0–25 or 0–30 mA) are required. 3. To supply power to the transmitter, a 24 VAC or 24 VDC voltage source is needed.
78 <strong>Pressure</strong> transmitters Dimensioned drawings Type series SN Dimensioned drawings SN…311 SN…-395/-280 Type series DPT (D) Dimensioned drawings 65.05 50 ¯ 6 57.5 22 7.5 18 59 M1:1 8.5 ¯ 4.5
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Product information Pressure Pressu
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Pressure

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