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OPERATING MANUAL

FOR DUAL-VALVE PRESSURE

CONTROLLERS

Models PCD · PCDS · PCD3 · IVCD

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Summary of Contents for Alicat Scientific IVCD

Page 1: ...OPERATING MANUAL FOR DUAL VALVE PRESSURE CONTROLLERS Models PCD PCDS PCD3 IVCD...

Page 2: ...ler every year Annual calibration is necessary to ensure the continued accuracy of readings and to extend the Limited Lifetime Warranty Fill out the Service Request Form at alicat com service or conta...

Page 3: ...sure controllers for closed volumes PCDS Series anti corrosive absolute gauge and differential pressure controllers for closed volumes PCD3 Series remote sensing pressure controllers for closed volume...

Page 4: ...PD I Control Algorithms 13 Tuning the PD PDF Control Algorithm 13 Tuning the PD I Control Algorithm 13 Troubleshooting Valve Performance with PID Tuning 14 Using a Control Deadband for Pressure Contr...

Page 5: ...ndard dual valve pressure controller Your pressure controller s appearance and connections may differ See page 2 for more examples Backlight The monochrome display comes equipped with a backlight To t...

Page 6: ...ode active HLD Valve hold active LCK Front display is locked POV Pressure over range of device Mounting Pressure controllers do not require straight runs of pipe upstream or downstream Most pressure c...

Page 7: ...need Teflon tape applied to the threads Warning It is not recommended to use pipe dopes or sealants on the process connections as these compounds can cause permanent damage to the controller should th...

Page 8: ...tween two points in the system These devices have two ports located on the front face of the unit for connection to two points in the system where the differential pressure is measured from The upstre...

Page 9: ...nstruments with Liquids Many pressure devices may be used with chemically compatible liquids but a few warnings must be taken into account Water is about 50 times more viscous than air This is importa...

Page 10: ...ndard 0 5 Vdc analog output signal Pin 2 is normally a constant 5 12 Vdc More pinout configuration options begin on page 24 Analog Signals Primary Analog Output Signal Most devices include a primary a...

Page 11: ...to Tare Before every new pressure measurement cycle After significant changes in temperature or pressure After dropping or bumping the pressure controller After installing the controller in a differen...

Page 12: ...set to Serial Front Panel the controller will accept input from either the front panel or an RS 232 RS 485 connection Neither source is a slave of the other so the controller will accept the most rec...

Page 13: ...ow to actuate its valve s in order to achieve the commanded setpoint These settings are tuned for your specific operating conditions but changes to your process sometimes require on site adjustments t...

Page 14: ...nd of 0 25 PSIA allows absolute pressure to vary between 29 75 and 30 25 PSIA The device will increase pressure until it reaches the setpoint of 30 PSIA With a setting of Close valve it will close bot...

Page 15: ...Only in the serial data frame Screen and Digital Both the main display and serial data frame Device Information The ABOUT menu MENU ABOUT contains useful information for setup configuration and troub...

Page 16: ...g and logging of all data Before connecting the pressure controller to a computer ensure that it is ready to communicate with your computer by checking the options in this menu For more on how to issu...

Page 17: ...isplay Screen Lighting The options and wording in the screen lighting menu will vary for monochrome versus color displays On monochrome displays press LESS CONTRAST or MORE CONTRAST to adjust the cont...

Page 18: ...others can be used if the computer its software and the controller are all set to the same rate Data bits 8 Parity none Stop bits 1 Flow control none Alicat s Serial Terminal Application Alicat s Ser...

Page 19: ...eads zero Taring an absolute pressure sensor requires a barometer and aligns the absolute pressure sensor with the external barometric pressure For an accurate tare a gauge or absolute pressure sensor...

Page 20: ...us sign New setpoint unit ID s floating point number setpoint Example as 15 00 setpoint of 15 00 PSIG Quick Command Guide Note Serial commands are not case sensitive In these examples the unit ID of t...

Page 21: ...sure standard you know is accurate If it checks out keep using it but tell us about the drop at your next annual recalibration so we can check it out for you Issue How can I see pressure in different...

Page 22: ...Unit ID to make sure you are addressing it properly with your serial commands 3 Check the pinout common pinouts are listed starting on page 24 4 Make sure the COM number matches the one your software...

Page 23: ...rrD Torr mmHgA mmHgG mmHgD Millimeter of mercury at 0 C inHgA inHgG inHgD Inch of mercury at 0 C mmH OA mmH OG mmH OD Millimeter of water at 4 C NIST conventional mmH OA mmH OG mmH OD Millimeter of wa...

Page 24: ...ptional 1 5 Vdc or 0 10 Vdc output signal 7 Power In 8 Ground common for power digital communications analog signals and alarms Caution Do not connect power to pins 1 through 6 as permanent damage can...

Page 25: ...og Out Analog Out Analog Out RX or A Analog Out NC Analog Out 3 Ground Analog In NC NC NC NC NC 4 NC Ground NC NC NC Analog Out NC 5 Power In Ground Power In Ground Ground Power In Ground 6 NC Ground...

Page 26: ...nalog Setpoint Input Analog Setpoint Input 5 Serial RS 232 TX signal Optional RS 485 B Serial RS 232 TX Signal Optional RS 485 B 6 Static 5 12 Vdc Optional Secondary analog output 4 20 mA 0 5 Vdc 1 5...

Page 27: ...2021 05 26 REV 1 DUAL VALVE PRESSURE CONTROLLER OPERATING MANUAL 27...

Page 28: ...d Plot No A 147 Road No 24 Next to Spraytech Circle opp Metropolitan Company Wagle Industrial Estate Thane West Mah r shtra 400 604 91 022 41248010 China SE Asia info cn alicat com alicat com cn 2nd F...

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