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Liquidew EExd User’s Manual

97097 Issue 14.1, November 2019

APPENDIX D

D.3

Calibration Procedure

Caution: A valid correction of the calibration can only

be done by a recognized humidity calibration laboratory

accredited by a standards institution such as UKAS or NIST.

Any calibration performed by an unrecognized body will

invalidate the calibration of the instrument.

1. Press the

Get Table

button to download the correction table for either

Channel 1 or 2 and check to see if the values are equal and exact. If

not, then the instrument has had its calibration adjusted previously. To

simplify the correction procedure, reset the adjusted values back to their

‘equal & exact’ default values.

2. Connect the Liquidew EExd to a suitable dew-point generator with a

reference hygrometer (preferably chilled-mirror type with traceable

calibration). Purge the Liquidew for a minimum of 5 days with air that is

drier than -100°Cdp (-148°Fdp) before commencing the calibration.

3. Increase the generator set-point in steps of 10°Cdp (18°Fdp), moving

sequentially up the Liquidew’s measurement range from –100 to +20°Cdp

(-148 to +68°Fdp) and record the dew point measured by the reference

and the Liquidew.
Suitable stabilization periods should be allowed between changing the

generator setting and taking the final sensor count and reference hygrometer

values. Actual stabilization times will depend to a degree on the type of

generator used, the gas flow rate and the integrity of the pipe work and

sensor manifold. As a rule of thumb, it is strongly suggested that the following

stabilization times are taken as a minimum requirement:

Dew-point Temperature

°Cdp

Minimum Stabilization Time

-100

5 days

-90

12 hours

-80

10 hours

-70

8 hours

-60

4 hours

-50

2 hours

-40

1 hour

-30

1 hour

-20

1 hour

-10

1 hour

+10

1 hour

+20

1 hour

If calibration is not being done to -100°Cdp (-148°Fdp) then the purge times

can be reduced:
Drier than -70°Cdp (-94°Fdp)

5 days

-41 to -69°Cdp (-41.8 to -92°Fdp)

64 hours

+20 to -40°Cdp (+68 to -40°Fdp)

16 hours

Содержание Liquidew EExd

Страница 1: ...Liquidew EExd Process Moisture Analyzer User s Manual 97097 Issue 14 1 November 2019...

Страница 2: ...rmation when contacting Michell Instruments for service purposes Analyzer Code Serial Number Invoice Date Location of Instrument Tag Number Analyzer Code Serial Number Invoice Date Location of Instrum...

Страница 3: ...and may not be copied or otherwise reproduced communicated in any way to third parties nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd Liq...

Страница 4: ...r Status Alarms 13 2 6 Liquidew EExd Start up Purge Procedure 14 2 7 Sample Flows 15 3 OPERATION 16 3 1 System Operation 16 3 2 User Interface 16 3 2 1 Interface Controls 16 3 2 2 Up Down Arrow Button...

Страница 5: ...imum Requirements for Start up Purging 15 Figure 8 MAIN Page in Single Channel top and Dual Channel Modes 16 Figure 9 User Interface 16 Figure 10 Up Down Arrow Buttons 17 Figure 11 SELECT Button 17 Fi...

Страница 6: ...Modbus RTU Communications 53 E 1 Introduction 53 E 2 Modbus RTU Basics 53 E 3 Physical Layer 53 E 4 Termination Resistor 54 E 5 Register Map 54 Appendix F Modbus RTU Details 63 F 1 Message Framing 63...

Страница 7: ...dix A Toxic Materials The use of hazardous materials in the construction of this instrument has been minimized During normal operation it is not possible for the user to come into contact with any haz...

Страница 8: ...iampere max maximum min minute s mV millivolt s N C normally closed N O normally open No number ppmW parts per million by weight psig pound s per square inch gauge RH relative humidity RTU Remote Term...

Страница 9: ...ling panel providing filtration flow control Sufficient differential pressure will be required typically greater than 0 5 barg 7 2 psig between the process sample source and return points This should...

Страница 10: ...n of the instrument the cover must remain fully secured 1 5 Advanced Sensor Technology Liquidew EExd utilizes the Michell Ceramic Moisture Sensor an advanced impedance sensor technology with integrate...

Страница 11: ...adsorption and desorption effects of the flowing sample and result in erroneous measurements In addition the Liquidew EExd features an advanced temperature compensation algorithm that automatically ma...

Страница 12: ...he field of moisture measurement As the moisture sensor has to be exposed directly to the process liquid stream in order to detect the dissolved moisture present key sampling issues such as the avoida...

Страница 13: ...connecting any cables 2 1 1 Equipment Ratings and Installation Details The mandatory statements contained within refer to the Ex certified Liquidew EExd Analyzer only not including the sampling system...

Страница 14: ...enclosure is supplied with an external earth stud at the lower right hand side At installation connect this earth stud to plant earth by a minimum 4mm2 earthing bonding M6 stud and 2 off M6 nuts and w...

Страница 15: ...o a maximum of 10 A This equipment and all power isolation devices must be installed in a location and position that allows safe and easy access to their operation and is able to rigidly support the e...

Страница 16: ...nd Maintenance Information Sheet is supplied separately to the manual WARNING This product is certified safe for use in a Zone 1 and Zone 2 area only This product must not be installed or used within...

Страница 17: ...t observe suitable lifting and handling precautions This product is not designed as portable or transportable equipment It should be rigidly fixed in position as per the full installation instructions...

Страница 18: ...es environmental ingress protection IP66 and should be mounted vertically in a location free of any appreciable vibration It should be placed in a shaded position to prevent heating effects through su...

Страница 19: ...ear any debris present prior to connection to the instrument A sample handling system must prepare the liquid in terms of filtration and temperature reduction if greater than 40 C 104 F before enterin...

Страница 20: ...ystem should be as low as possible sample lines should be kept as short as possible to minimize response lag time to changing process conditions Piping should be lagged and or trace heated if ambient...

Страница 21: ...NOTE The maximum output resistance for the 4 20 mA outputs is 500 See Section 3 7 on the setting of the 4 20 mA outputs via the user interface and Appendix F on setting the outputs via the Modbus inte...

Страница 22: ...t necessary to carry out this procedure if power or signal connections only have been disconnected 1 Before start up ensure that all power and signal connections to the Liquidew EExd are fully isolate...

Страница 23: ...INIMUM REQUIREMENTS FOR START UP PURGING INLET NEEDLE VALVE FLOW CONTROL NEEDLE VALVE Figure 7 Minimum Requirements for Start up Purging 2 7 Sample Flows The flow meter provides the user with an indic...

Страница 24: ...h 1 and 2 sensor configurations TIME TO NEXT DATA LOG 7m 45s DEWPOINT 3 9 0 Cdp TEMPERATURE 25 4 0 C TIME TO NEXT DATA LOG 6m 45s DEWPOINT CH1 4 6 0 Cdp 25 5 0 C DEWPOINT CH2 3 9 0 Cdp 24 5 0 C Figure...

Страница 25: ...rough lists and adjust values 3 2 3 SELECT Button SELECT Figure 11 SELECT Button The SELECT button is used to select or de select a highlighted item in a menu list 3 2 4 MENU MAIN Button MENU MAIN Fig...

Страница 26: ...nsor 1 Sensor 2 Sensor 1 Info Sensor 2 Info SELECT Press MENU MAIN button to get back to Main Page from any location MENU MAIN Use Up Down arrow buttons to scroll through menu items and pages Variable...

Страница 27: ...ING MENU VIEW ADJ VARIABLES SENSOR INFO CONTACT INFO Figure 14 MAIN MENU Page 3 5 STATUS Page This page shows the status of the process alarm and flow for one or both channels depending upon the confi...

Страница 28: ...logged the oldest measurement will be deleted and replaced as each new measurement is logged Caution Changing the moisture value e g from dew point to moisture will reset all the logged data and star...

Страница 29: ...e the Up and Down buttons to scroll through the statistics Press the MAIN MENU button to return to the MAIN Page 3 6 3 VIEW SYSTEM FAULTS Page This page displays a record of the last six system faults...

Страница 30: ...cess to the Variables Pages as detailed in the following sections 3 7 2 VARIABLES Pages Three pages four pages in the dual channel configuration are used to display the system variables They can be ad...

Страница 31: ...select the sample solute type or user defined solute alarm Moisture content or dew point value that trips the process alarm OP1min Moisture content or dew point value that gives 4 mA on mA1 output OP1...

Страница 32: ...annel 2 Variables Page 2 Variable Brief Description OP1min Moisture content or dew point value that gives 4 mA on mA1 output OP1max Moisture content or dew point value that gives 20 mA on mA1 output O...

Страница 33: ...at temp of 50 C To view the table of Cs values scroll to the desired user defined solute using the Up and Down buttons press the SELECT button and the relevant table will appear To edit any of the val...

Страница 34: ...12 SENSOR S N FD79 0430 Figure 21 SENSOR INFO Page Hours Used Duration that the sensor has been in active use Next Cal Next recommended calibration date of sensor Sensor S N Serial number of sensor 3...

Страница 35: ...Michell Instruments www michell com or your local representative 4 1 Enclosure Cover and User Interface The enclosure cover is part of the flameproof protection for the enclosure and has an IP66 ratin...

Страница 36: ...DANGER Electric Shock Risk The power to the enclosure must be turned off before any work is carried out in the measurement system enclosure Observe de energize durations 1 Isolate the incoming sample...

Страница 37: ...from the enclosure 8 Reconnect the sensor connections to the replacement moisture sensor assembly Reposition the assembly on the stay bracket and secure with the M3 cap head screw 9 Refit and fully ti...

Страница 38: ...ions of Safe Use 2 Remove the enclosure window and mount the user interface see Section 4 1 3 Restrain the flow meter assembly 1 and use a 14mm wrench to loosen and remove the 2 off 6mm sample pipe co...

Страница 39: ...has failed disconnected HIGH FLOW Flow through sensor measurement cell is 2 6 l min 0 69 GPM SATURATION Dew point is greater than or equal to temperature CAL TABLE ERROR Fault with sensor calibration...

Страница 40: ...tion Modbus Register 35 Also see Appendix G Register Configuration C for more details Error Code Error Relay Activated Error Condition 0000 NO All previous errors now cleared 0001 YES Channel 1 dew po...

Страница 41: ...Code 0800 Channel 2 high flow plus Error Code 0040 Channel 1 cal table error 0800 0400 0C00 Note In hexadecimal A 10 B 11 C 12 D 13 E 14 F 15 4 4 4 Analyzer Fault Alarm Relay The process alarm contact...

Страница 42: ...Liquidew EExd User s Manual 34 97097 Issue 14 1 November 2019 APPENDIX A Appendix A Technical Specifications...

Страница 43: ...12 Fdp 1 C between 80 100 Cdp 2 F between 112 148 Fdp Temperature Coefficient Algorithm compensation Operating Pressure Max 80 barg 1160 psig Sample Flow Up to 1 Nl min 0 1 to 0 2 Nl min recommended U...

Страница 44: ...PPENDIX A General Sample Connections 1 8 NPT F Weight 21kg 46lbs Operating Supply Voltage 90 to 260 V AC 47 63 Hz 180 W Main Unit Operating Environment Indoor Outdoor 20 to 60 C 4 to 140 F Max 95 RH H...

Страница 45: ...restor Do NOT obscure Sample in Channel 2 Optional Flame Arrestor 1 8 NPT Female ATEX IECEx CSA Sample out Channel 2 Optional Flame Arrestor 1 8 NPT Female ATEX IECEx CSA Sample in Channel 1 Flame Arr...

Страница 46: ...tions FLOW METER CHANNEL 1 FLAME ARRESTOR SAMPLING BLOCK MICHELL MOISTURE SENSOR SAMPLE IN SAMPLE OUT SAMPLE IN SAMPLE OUT MICHELL MOISTURE SENSOR FLAME ARRESTOR FLAME ARRESTOR BREATHER FLAME ARRESTOR...

Страница 47: ...0 21 22 23 NC C NO NC C NO AL3 AL2 AL1 AL4 COMMS Channel 1 Channel 2 Optional PL16 PL20 PL15 PL14 PL19 B A GND mA1 mA1 mA2 mA2 mA3 mA3 mA4 mA4 L E N Gland Cable screen Enclosure wall Figure 30 System...

Страница 48: ...Liquidew EExd User s Manual 40 97097 Issue 14 1 November 2019 APPENDIX B Appendix B Variable Definitions...

Страница 49: ...y option below is enabled to allow the selection of the sample Solute ii mA1 and mA3 outputs represent the setting of Channels 1 2 respectively NOTE Changing the units clears the data logging memory a...

Страница 50: ...Options 0 to 70 C for temperature Description OP2min and OP4min are the moisture values that 4 mA represents for the respective output OP2max and OP4max are the moisture values that 20 mA represents f...

Страница 51: ...instrument address for networking This address is used by the Modbus protocol to specify the location of the Liquidew EExd instrument in the network Variable SET DEFAULT Adjustable Range Options NONE...

Страница 52: ...ed Solute CUSTOM LABEL CHAR Adjustable Range Options A to Z hyphen space 0 to 9 Description Characters that make up the user defined solute custom label The default values are CHN 1 2 Dew point Apply...

Страница 53: ...Liquidew EExd User s Manual Michell Instruments 45 APPENDIX C Appendix C Software...

Страница 54: ...ith this application software it is possible to View all main parameters of interest Modify parameters Record parameters to a virtual chart recorder Record parameters to a file Acquire data from up to...

Страница 55: ...Liquidew EExd User s Manual Michell Instruments 47 APPENDIX D Appendix D Calibration Correction...

Страница 56: ...normally arranged as shown in the following extracts Extract from a UKAS Calibration Certificate Generated Dew point C Test Hygrometer Dew point Temperature C Correction Required C Expanded Uncertaint...

Страница 57: ...ction window two sets of data may be entered Ref DP Dew point data for the reference hygrometer sometimes called the actual dew point or the standard Liquidew DP Measured dew point value of the Liquid...

Страница 58: ...s drier than 100 Cdp 148 Fdp before commencing the calibration 3 Increase the generator set point in steps of 10 Cdp 18 Fdp moving sequentially up the Liquidew s measurement range from 100 to 20 Cdp 1...

Страница 59: ...lues for the reference and the Liquidew that were recorded in item 1 above and leave the values equal and exact for used calibration points 5 To modify a data point double click on the relevant cell a...

Страница 60: ...Liquidew EExd User s Manual 52 97097 Issue 14 1 November 2019 APPENDIX E Appendix E Modbus RTU Communications...

Страница 61: ...tions to perform using the information contained in the data bytes The error check field provides a method for the slave to validate the integrity of the message contents If the slave makes a normal r...

Страница 62: ...11 000B Sensor 1 Humidity Setting dp or moisture R W B 12 000C mA1 output maximum value sensor 1 humidity R W K 13 000D mA1 output minimum value sensor 1 humidity R W K 14 000E mA2 output maximum val...

Страница 63: ...036 Humidity average Lo Word Sensor 1 R L 55 0037 Not Used 56 0038 Not Used 57 0039 Instrument Type R I 58 003A Firmware Version Number R I 59 003B Not Used 60 003C Not Used 61 003D Humidity max Hi Wo...

Страница 64: ...0 23 mA R W A 101 0065 Force mA1 to a value in of 100 23 mA W A 102 0066 Force mA2 to a value in of 100 23 mA W A 103 0067 CALZ WDP 0 calibration value Sensor 1 R F 104 0068 CALS WDP 2nF calibration v...

Страница 65: ...p Ref R W H 192 Sn1 40 Cdp Ref R W H 193 Sn1 50 Cdp Ref R W H 194 Sn1 60 Cdp Ref R W H 195 Sn1 70 Cdp Ref R W H 196 Sn1 80 Cdp Ref R W H 197 Sn1 90 Cdp Ref R W H 198 Sn1 100 Cdp Ref R W H 199 Sn1 20 C...

Страница 66: ...W H 218 Sn2 40 Cdp Ref R W H 219 Sn2 50 Cdp Ref R W H 220 Sn2 60 Cdp Ref R W H 221 Sn2 70 Cdp Ref R W H 222 Sn2 80 Cdp Ref R W H 223 Sn2 90 Cdp Ref R W H 224 Sn2 100 Cdp Ref R W H 225 Sn2 20 Cdp Cal...

Страница 67: ...0 R H 264 0108 Date Day Month t 1 R J 265 0109 Time Hours Mins t 1 R J 266 010A Humidity 1 Hi Word t 1 R L 267 010B Humidity 1 Lo Word Pressure t 1 R L 268 010C Temperature 1 t 1 R H 269 010D Humidit...

Страница 68: ...F 1478 05C6 User Cs Table 4 Cs Value at 0 C R W F 1479 05C7 User Cs Table 4 Cs Value at 10 C R W F 1480 05C8 User Cs Table 4 Cs Value at 20 C R W F 1481 05C9 User Cs Table 4 Cs Value at 30 C R W F 14...

Страница 69: ...Char 4 R W F 1512 05E8 User Solute 4 Label Char 5 R W F 1513 05E9 User Solute 4 Label Char 6 R W F 1514 05EA User Solute 4 Label Char 7 R W F 1515 05EB User Solute 4 Label Char 8 R W F NOTE To downloa...

Страница 70: ...Liquidew EExd User s Manual 62 97097 Issue 14 1 November 2019 APPENDIX F Appendix F Modbus RTU Details...

Страница 71: ...following data bytes The only valid codes are 03 Read Holding Registers or 06 Write To Single Register as these are the only two implemented An exception can occur if the message contains an unsupport...

Страница 72: ...he state diagram of how the message is processed with the exceptions that may be raised ENTRY Address in message Instrument Address Function code supported Exception Code 01 0x0000 Quantity of Registe...

Страница 73: ...tarting Address LSB 07H 5 No of points MSB 00H 6 No of points LSB 02H 7 CRC Lo Byte H 8 CRC Hi Byte H Read Request Message In response to the above message the Liquidew EExd may transmit the following...

Страница 74: ...n Figure 34 shows the state diagram of how the message is processed with the exceptions that may be raised ENTRY Address in message Instrument Address Function code supported Exception Code 01 0x0000...

Страница 75: ...s 0015H to a Liquidew EExd with an address of 01H The CRC is calculated using the data in bytes 1 to 6 Byte No Meaning Value 1 Slave Address 01H 2 MODBUS function code 06H 3 Starting Address MSB 00H 4...

Страница 76: ...n code received in the query is not an allowable action for the slave 02 ILLEGAL DATA ADDRESS The data address received in the query is not allowable More specifically the combination of starting addr...

Страница 77: ...Liquidew EExd User s Manual Michell Instruments 69 APPENDIX G Appendix G Register Number Formats...

Страница 78: ...0 0001 Channel 1 dew point under range 120 C 184 F 1 0002 Channel 1 dew point over range 30 C 86 F 2 0004 Channel 1 temperature out of range 50 or 0 C 122 or 32 F 3 0008 Channel 1 low flow 0 1 l min 4...

Страница 79: ...nd 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 w w w r w r w r w r w Reset Reset C F 0 C 1 Initiate Register Configuration F 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 r w r w r w r w r w r w r w r w r w r w r w...

Страница 80: ...e 17th March 1103H Register Configuration K signed int 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 r r r r r r r r r r r r r r r r Value Sign bit 1 for ve values signed int 7FFF 32767 8000 32768 Register C...

Страница 81: ...and 0100 1100 1100 1100 1101 0x2 1 1x2 2 1x2 20 0 3 Therefore the word value 0100 0001 0010 0100 1100 1100 1100 1101 4124CCCD Consequently for sensor 1 register 0001 4124 and register 0002 CCCD 2 0 00...

Страница 82: ...Liquidew EExd User s Manual 74 97097 Issue 14 1 November 2019 APPENDIX H Appendix H Hazardous Area Certification...

Страница 83: ...N60079 0 2012 A11 2013 IEC60079 0 2011 EN60079 1 2014 IEC60079 1 2007 C22 2 No 142 M1987 UL508 C22 2 No 30 M1986 UL1203 H 2 Product Certification This product is attributed with the product certificat...

Страница 84: ...oated the enclosures could present an electrostatic hazard Clean only with a damp or anti static cloth 7 The enclosure is to be earthed externally using the earth point provided 8 Only suitably ATEX I...

Страница 85: ...Liquidew EExd User s Manual Michell Instruments 77 APPENDIX I Appendix I Quality Recycling Warranty Information...

Страница 86: ...directives Full information can be found on our website at www michell com uk compliance This page contains information on the following directives ATEX Directive Calibration Facilities Conflict Mine...

Страница 87: ...Liquidew EExd User s Manual Michell Instruments 79 APPENDIX J Appendix J Return Document Decontamination Declaration...

Страница 88: ...emicals YES NO Radioactive substances YES NO Other hazards YES NO Please provide details of any hazardous materials used with this equipment as indicated above use continuation sheet if necessary Your...

Страница 89: ...Liquidew EExd User s Manual Michell Instruments 81 NOTES...

Страница 90: ...http www michell com...

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