manualshive.com logo in svg

Phymetrix PLMa, Руководство пользователя, Страница: 13 / 29

Поделиться
Скачать
Phymetrix PLMa Скачать руководство пользователя страница 13

Measuring with the PLMaEx, Near Atmospheric Pressure 

It is recommended for most applications to perform the measurement at near atmospheric 
pressure. Placing the flow control orifice at the inlet and allowing the outlet to be unrestricted 
(other than the exhaust pigtail and flow meter), assures that the analyzer has sufficient but not 
excessive flow and the pressure inside the sampling chamber is near atmospheric. This approach 
guarantees safe conditions and eliminates the need for the optional pressure sensor. If there is no 
pressure sensor the analyzer can be set with atmospheric pressure 14.7psia for the Measuring 
setting of the pressure correction (refer to section factory default setting, the orifice and 
unrestricted outlet will guarantee repeatable conditions for all pressures within the rating of the 
orifice. 

Measuring with the PLMaEx, at Pressure of Sample 

If it is desired to perform the measurement at the same pressure as the sample, up to the rating of 
the analyzer (1000 psia standard), then place the orifice at the outlet.  
When the analyzer is setup with the orifice at the outlet, the measuring chamber will be 
pressurized to the same pressure as your sample. To perform accurate measurements, you must 
know the pressure and enter it into the analyzer. 

6

 

Installation 

6.1

 

Mechanical Installation 

6.1.1

 

PLMa Mechanical Installation 

The PLMa can be mounted directly on a sample cell or any vessel equipped with 3/4"-16 parallel 
threads port or 1/4 NPT pipe threads. Refer to Appendix A PLMa Installation Drawing. 

6.1.2

 

PLMaEx Mechanical Installation 

The PLMaEx can be mounted directly on the pipe or can be mounted on a panel surface and 
connected with tubing. Refer to Appendix B PLMaEx Installation Drawing. 
Connections for inlet and outlet of the gas being measured are made through a variety of 
available options e.g. 

⅛

” or ¼” Swagelok® tubing compression fittings. 

Refer to Mechanical Installation Drawing Appendix B. 

6.1.3

 

PLMa-Probe-Ex Mechanical Installation 

The PLMa-Probe-Ex is intended to be installed directly on the pipeline through a 1/2" or larger 
ball valve. Refer to Mechanical Installation Drawing and pictorial Installation Instructions in 
Appendix C. 

6.2

 

Electrical Connections: Power, 4/20mA Analog Output, Serial I/O  

6.2.1

 

Powering the PLMa , PLMaEx or PLMa-Probe-Ex 

The PLMa, PLMaEx and PLMa-Probe-Ex are 4/20mA loop powered analyzers with a HART 
digital interface. The analyzer will operate from 5 VDC to 28VDC power and will draw 4mA to 

8

Содержание PLMa

Страница 1: ...PhyMetrix Loop powered Moisture analyzer User s Manual for Models PLMa and PLMaEx ...

Страница 2: ...t has been made to ensure accuracy in the contents of this manual Should there be any doubts to the accuracy of the content please contact the manufacturer The contents of this manual are subject to change without notice The instructions procedures drawings specifications and concepts contained in this manual are the property of Phymetrix Inc and shall not be used as the basis for the manufacture ...

Страница 3: ...xtend beyond the description of the face hereof that no oral warranties representations or guarantees of any kind have been made by Phymetrix its distributors or the agents of either of them that in any way alter the terms of this warranty that Phymetrix and its distributors shall in no event be liable for any consequential or incidental damages including but not limited to injury to the person or...

Страница 4: ...tion 8 6 1 Mechanical Installation 8 6 1 1 PLMa Mechanical Installation 8 6 1 2 PLMaEx Mechanical Installation 8 6 1 3 PLMa Probe Ex Mechanical Installation 8 6 2 Electrical Connections Power 4 20mA Analog Output Serial I O 8 6 2 1 Powering the PLMa PLMaEx or PLMa Probe Ex 8 6 2 2 Serial I O RS 232 9 7 Digital Interface HART 9 8 Troubleshooting and Maintenance 11 8 1 Cleaning 11 8 2 Self Diagnosti...

Страница 5: ...Revision 2 1 August 2013 This page intentionally left blank ...

Страница 6: ...thods and handling precautions There are also some sections that review general knowledge and concepts of water vapor science Read this manual thoroughly before using the analyzer There is a Quick Setup Manual describing the main functions and basic procedures for performing measuring operations Check our website www phymetrix com for latest versions of documentation regarding these analyzers Afte...

Страница 7: ... a sample cell The PLMa is provided with 3 4 16 parallel treads with O ring seal and with 1 4 Male NPT threads See Appendix A The PLMaEx is equipped with a built in sampling system which has the required tight seals to measure low moisture content it consists of a stainless steel 100 micron filter and a flow control orifice which may be placed at either the inlet or outlet of the sampling cell or ...

Страница 8: ...ized before connecting or disconnecting the sample tubing Corrosives such as Ammonia HCl and Chlorine should be avoided H2S and SO2 can be present if the moisture content is below 10 PPMv Avoid extreme temperatures pressures and mechanical vibration refer to specifications Do not disassemble the analyzer Do not use with contaminants and liquids refer to section 5 2 for sample conditioning Avoid ex...

Страница 9: ...pe Thus even though the total pressure in the pipe is much greater that the pressure outside the reverse is true for the water vapor pressure and as we discussed earlier the water vapor seeks to equilibrate its pressure thus it wants to flow from the outside to the inside and will do so through the cracks in the joints such as poorly tightened fittings or NPT threads even if they are properly tape...

Страница 10: ...ure on the efficiency of gas dryers etc It is possible to minimize this effect using sun shields and tubing insulators Alternatively one may study the response of the particular system to ambient temperature by logging data over several days during different seasons and compensating the measurements for this effect The temperature effect will vary greatly depending on the size and materials of the...

Страница 11: ... if they have a plastic flow tube ensure flow meters are connected at the analyzer exhaust not at inlet However metering valves should be at the inlet in order to maintain constant atmospheric pressure in the sampling chamber 5 4 Sample Pressure Pressure variations will effect the measurement Higher pressure is more likely to produce condensation and thus erroneous readings or even damage the sens...

Страница 12: ...orifices can be provided to accommodate different pressures and flows Consult PhyMetrix support for its proper sizing source pressure psia Bar flow SLPM 0 016 orifice flow SLPM 0 012 orifice flow SLPM 0 008 orifice flow SLPM 0 006 orifice flow SLPM 0 004 orifice 15 1 03 0 7 0 4 0 17 0 08 0 04 25 1 72 2 1 3 0 6 0 3 0 1 35 2 4 3 1 9 0 8 0 5 0 2 55 3 8 4 8 3 0 1 4 0 7 0 3 75 5 2 6 6 4 1 1 9 1 0 0 4 1...

Страница 13: ... pressurized to the same pressure as your sample To perform accurate measurements you must know the pressure and enter it into the analyzer 6 Installation 6 1 Mechanical Installation 6 1 1 PLMa Mechanical Installation The PLMa can be mounted directly on a sample cell or any vessel equipped with 3 4 16 parallel threads port or 1 4 NPT pipe threads Refer to Appendix A PLMa Installation Drawing 6 1 2...

Страница 14: ...obe Ex have a explosion proof junction box with pluggable screw terminal connector Conduit can be connected to the junction boxes 3 4 NPT port 6 2 2 Serial I O RS 232 The PLMa can provide a RS 232 interface Refer to the PLMa Electrical Connection diagram in Appendix A for connections 7 Digital Interface HART The PLMa is equipped with a HART interface which overlays digital signals on the 4 20mA lo...

Страница 15: ...nd Date For use by owner operator to identify the device and its use Can search for the Tag with command 11 on multidrop connections 19 Write Final Assembly Number For use by owner operator to identify the device and its use 35 Write Primary Variable Range Values Setup the measurement units and values that correspond to 4mA and 20mA output of the loop 40 Analog Out Fixed Forces the Analog Output D...

Страница 16: ...e of the most common suspected erroneous conditions are listed in the following table included are common reasons and suggested remedies If the measurement is suspected to be erroneous before calling for support it may be helpful to have the following information Type of gas being measured Expected dewpoint Nominal pressure consider back pressure Nominal temperature Nominal flow rate though the an...

Страница 17: ... be yearly or in 5 years Consult with factory Equilibrium The rate at which the system will reach equilibrium depends on the system particulars such at ambient temperature internal pressure flow rates system materials of construction surface area of system internals Previous experience may be indicative of the system response time It is common for systems to take hours to equilibrate Sampling poin...

Страница 18: ... 40 C to 85 C Moisture Sensor 20 C to 60 C Moisture Sensor Range 110 C to 20 C Accuracy 2 C temperature corrected Repeatability 0 8 C Response time 95 of step change in 3 min Sample flow 1 LPM Temperature Sensor 40 C to 70 C 2 C Electrical 4 20mA Loop Powered 5 28VDC with HART additional TTL level outputs for either HART or Alarm indications PLMaEx 3 4 OD tube and 1 4 NPTF Inlet 1 8 NPTF Outlet Fl...

Страница 19: ...ess than 5V the power supply should be no less than 11V One should also consider the total resistance of the cable when computing the voltage drops for the power supply requirement thus should use a minimum 1 4 Watt rated resistor Limitations Measurement Calculations The PLMa communicates the measured dewpoint to the user by drawing using between 4 and 20 mA of power The user measures this current...

Страница 20: ...mounted in Swagelok Tees Can use the sample Cell 3 4 16 parallel threads with O ring seal 1 4 Female NPT Tee Swagelok SS 4 T other Male Female combinations can be used Or For NPT connection Tighten with 1 5 wrench across flats 2 3 turns after hand tight engagement Hand tighten until metal to metal contact Welded fittings available optionally 75 Unless otherwise specified dimensions are in inches x...

Страница 21: ...4 25 8 25 0 1 3 4 NPT Electrical connection port 3 4 NPT Electrical connection port port not open for use Outlet 1 8 NPT Inlet 1 4 NPT 100 micron sintered stainless steel filter Sensor Removable Flow Control Orifice Grounding Screw 2 800 0 750 dia can be used to swage a Swagelok tube fitting 4 0 5 shield Loop Loop Moisture Analyzer SN 000 PhyMetrix Inc PLMaEx 20mA 20 Cdp 4mA 100 Cdp HARTfi enabled ...

Страница 22: ...Appendix C PLMa Probe Ex Installation Drawing 17 ...

Страница 23: ...18 ...

Страница 24: ...50 0 Alarm Relay 2 Hysteresis 0 0 to 50 0 Alarm Relay 2 Setting Offset Value Subtracted from measurement before displaying Normally set to 0 See Zeroing Display Input Signal Selection Select mA as shown in the example on the left for 4 20mA input See Input selection Lower Set Point Value to compute for Display when input is 4mA Upper Set Point Value to compute for Display when input is 20mA Units ...

Страница 25: ... for molded cable 1 brown LOOP 2 white Tx out TTL 3 blue LOOP 4 black Rx in TTL 5 green yellow ground to housing isolated from other 4 pins PLMa Top View with Molded Cable Connector Installed PLMa Top View PLMa Side View Dewpoint Display 4 Rear View 0 195 dia 3 meter long cable Molded connector can be installed only in this direction Screw terminal Field connectors can be oriented in 4 directions ...

Страница 26: ...age of 5 samples Upper Set Point Value to compute for Display when input is 20mA Decimal Point setting Lock Changes Set to 000 to allow changes Set to 010 for read only mode Transmit Analog Output Low Value Display Value that will generate a 4mA output Transmit Analog Output High Value Display Value that will generate a 20mA output When in any of the 15 Menu Screens to K Press SET to store the sel...

Страница 27: ...ector Installed 0 195 dia 3 meter long cable Molded connector can be installed only in this direction Screw terminal Field connectors can be oriented in 4 directions from pin 1 BROWN or RED LOOP from pin 3 BLUE or BLACK LOOP Gnd pin 15 and Common pin 7 are electrically isolated from each other 90 265V AC DC Power A L 1 A L 2 4 2 0 m A 2 4 V D C G n d C o m m o n m V m A V o l t s Inputs Relays Out...

Страница 28: ...23 Log Appendix E Analyzer Calibration Analyzer Serial Number Sensor Serial Number Date Performed by Comments Notes ...

Страница 29: ...631 627 3950 Fax 1 631 627 3949 www phymetrix com sales phymetrix com service phymetrix com countries with local representation 2 Y ear Warra n t y PhyMetrix MADE IN USA Moisture Measurement Innovation at Work Integrating nanotechnology into moisture measurement ...

Отзывы:

Нет отзывов