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EGM-4 Environmental Gas
Monitor For CO
2
Operator's Manual
Version 1.00
© 2002 PP Systems. All Rights Reserved
29th October 2002
Europe
North America
PP Systems
PP Systems Inc.
Unit 2, Glovers Court, Bury Mead Road.
241 Winter Street
Hitchin, Hertfordshire, SG5 1RT, U.K.
Haverhill, MA 01830 U.S.A.
Tel: +44 1 462 453 411
Tel: +1 978 374-1064
Fax: +44 1 462 431 090
Fax: +1 978 374-0972
Email:
support@ppsystems.com
Web Site:
http://www.ppsystems.com
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Table of Contents
Summary of Contents for PP EGM-4
- Page 1 EGM-4 Environmental Gas Monitor For CO Operator’s Manual Version 1.00 © 2002 PP Systems. All Rights Reserved 29th October 2002 Europe North America PP Systems PP Systems Inc. Unit 2, Glovers Court, Bury Mead Road. 241 Winter Street Hitchin, Hertfordshire, SG5 1RT, U.K.
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Page 3: Table Of Contents
Condensation Risk ..................6 PP Systems’ Contact Information..............7 Technical Specification .................8 Introduction ....................9 Measurement Principle..................9 Getting Familiar With The EGM-4 ...............10 Front Panel........................10 Top Of EGM-4....................... 10 Back Of EGM-4 ......................11 Environmental Sensor Inputs (I/O Ports).............11 Analog Output .....................12 Current Output ....................12... - Page 4 Table of Contents 7VOUT ..........................28 3CAL ......................29 Connecting Calibration Gas To The EGM-4..............29 4DMP ......................30 Screen Display........................30 Data Dump........................32 Record Structure....................... 32 Data Structure Based On Probe/Sensors................. 33 Error Codes ........................34 EGM Serial Outputs For Use With WINDOWS Data Transfer Program..35 5CLR ......................35...
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Page 5: Preface
User Registration It is very important that ALL new customers register with us to ensure that our user’s list is kept up to date. If you are a PP Systems’ user, please register yourself electronically on our web site at http://www.ppsystems.com/Register.html... -
Page 6: Warning Notice
This manual, and the information contained in it, is copyright to PP Systems. No part of the manual may be copied, stored, transmitted or reproduced in any way or by any means including, but not limited to, photocopying, photography, magnetic or other mechanical or electrical means, without the prior written consent of PP Systems. -
Page 7: Pp Systems' Contact Information
If condensation appears to be a problem, we suggest increasing the flow rate. condensation persists, it is then recommended that a PP Systems’ water vapour equilibrator (Part No. CRS090) is used. This is constructed from a material that is very permeable to water vapour but impervious to CO . -
Page 8: Technical Specification
Two gas ports (inlet and exhaust) for 1/8” (.125) ID tubing. Housing High Impact, Aluminium Enclosure. Dimensions 158 W mm x 210 D mm x 62 H mm Weight 1.5 kg. EGM-4 Operator's Manual – Version 1.00 - 8 -... -
Page 9: Introduction
Ah lead acid rechargeable battery providing up to 6 hours continuous use. For extended operation in the field (> 6 hours), PP Systems can also provide an external power supply cable that will allow you to connect up to an external 12 V battery. If interested, please contact PP Systems (See PP Systems’... -
Page 10: Getting Familiar With The Egm-4
Getting Familiar With The EGM-4 Getting Familiar With The EGM-4 Display Keypad Character Front Panel Sensor Connectors Gas In Port RS232 Gas Out Port Connector Top Of EGM-4 EGM-4 Operator's Manual – Version 1.00 - 10 -... -
Page 11: Back Of Egm-4
4.3 KΩ Chamber or CPY-3 Canopy Chamber. Note. If the sensor is not connected to the EGM-4 when first turned on, it will not be detected and the subsequent displays will not be available. EGM-4 Operator's Manual – Version 1.00... -
Page 12: Analog Output
Getting Familiar With The EGM-4 Analog Output The EGM-4 has a 0-5V analog output. The default output is set at 0-5V. However, this can be changed by the user (if required) to any value in between (i.e. 0-2V, 0-3V, 0-4V). (See 7VOUT). -
Page 13: Lcd Display
The EGM-4 features a 2x16 character, backlit LCD display. Gas Ports There are two gas ports located on the top of the EGM-4. Each port is designed for use with 1/8” (.125) ID tubing. One gas port is labelled “Gas In” and the other “Gas Out”. The sampling line should be fitted to the “Gas In”... -
Page 14: Operation
The EGM-4 is a menu driven instrument. Note. If any external sensors/probes are to be used with the EGM-4, they MUST be electrically connected to one (or both) of the I/O ports prior to turning the instrument on. When the instrument is first powered up, it will go through its normal warm-up period that takes approximately 5 minutes. - Page 15 Refers to the probe/sensor connected to the EGM-4. For a list of probe types, see Environmental Sensor Inputs (I/O Ports). R150 Number of records stored in memory. If the EGM-4 is being used as a porometer (i.e. PMR-4), the following will be displayed: C2000 1V=2000 POROMETER R150 Where: C2000 Corresponds to the last calibration gas concentration.
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Page 16: Main Menu
Each option is discussed in further detail below. 1REC To begin recording, press key 1. Please note, the EGM-4 display is dependent upon which probe type is connected to it. The following table illustrates the Probe Types: If the EGM-4 is used as a:... -
Page 17: Pp Systems Environmental Sensor Conversions
The record number resets each time the instrument starts or when the memory is cleared. It counts up to 9999 and then resets automatically to 1. The internal EGM-4 memory allows data storage of up to 1,000 records. Please note, when the memory is full, it overwrites the oldest records. -
Page 18: Environmental Monitor (Probe Types 1-6 And 10)
The record number resets each time the instrument starts or when the memory is cleared. It counts up to 9999 and then resets automatically to 1. The internal EGM-4 memory allows data storage of up to 1,000 records. Please note, when the memory is full, it overwrites the oldest records. -
Page 19: Pp Systems Environmental Sensor Conversions
Inputs. PP Systems Environmental Sensor Conversions: The following conversions need to be made to determine actual measurements of PAR, %RH and temperature when using PP Systems’ environmental sensors. PAR Sensor mV x 3 = PAR Level (µmol m %RH Sensor... -
Page 20: Closed System Soil Respiration (Probe Type 8)
The system always starts up with the SRC default values. Press key 1 to change the volume, key 2 to change the area, etc. (Display 3): 1V: 1171 2A: 78 3V/A*100 1491 EGM-4 Operator's Manual – Version 1.00 - 20 -... - Page 21 The number in the bottom right (03 in this case) is a count from 0-15 in 1.6 second increments. When completed, the following is displayed (Display 7): PLACE ON SOIL PRESS Y TO START EGM-4 Operator's Manual – Version 1.00 - 21 -...
- Page 22 After approximately 5 seconds, the measurement will commence. Before final calculation of soil respiration rate (g (CO Hour) can be achieved, the EGM-4 must have accumulated 4 data sets. The measurement display is as follows (Display 9): C00395 H14.7 T22 A02.11 Q0000 110...
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Page 23: Oxygen (Probe Type 9)
. If 9999 is entered when the true area is smaller, the calculated flux will be the chamber flux. After performing a Zero, the next display will be as follows (Display 2): REC 0001 PLOT 00 03-04 12:40 EGM-4 Operator's Manual – Version 1.00 - 23 -... - Page 24 Temperature of the CFX-1 or CPY-3 Chamber (˚C) exchange (Assimilation rate) (µmol m Flow Rate (ml/min) If you press the 8/X key, the standard EGM-4 data is displayed (i.e. CO O, etc.). With the CPY-3 chambers, the atmospheric pressure Annnn is replaced by the PAR reading (Qnnnn).
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Page 25: Calculation Of Fluxes For Cfx And Cpy Chambers
If the instrument is being used on its own, press key 1. If an external sensor/probe is used simultaneously, press key 2. If the EGM-4 is being used as a porometer, press key 3. After making your selection, an asterisk (*) will be placed next to your selection. The EGM-4 will... -
Page 26: Changing The Zero Type
Press 2ZERO to change the zero type and the time interval for performing zeros. Changing the Zero Type Press key 2 (2ZERO) and then key 1 to change the zero type used by the EGM-4. At present, there are 3 types of zeros that can be performed: Auto This is the recommended ZERO type. -
Page 27: 4Av
The EGM-4 is set to MANUAL recording by default. 6ALM There are both high and low alarm facilities built into the EGM-4. A 2 pin header type connector (CN6) is located on the internal EGM-4 circuit board for controlling the alarm. All EGM-4’s are currently supplied with the alarm disabled as the jumper is fitted to just one pin... -
Page 28: Setting The Low Co Alarm Setpoint
The display will show ?????. Enter the required value. Note, leading zeros are required for values less than 1000 (i.e. 00900 for 900). The default EGM-4 high alarm setpoint setting is 2000. As long as the high alarm is set to the maximum CO ppm range of the instrument, the alarm is inactive. -
Page 29: 3Cal
2 if you want to change the CO concentration corresponding to the analog output value. As in the display above, the EGM-4 would be set up with an analog output of 0-1V corresponding to a measurement range of 0-2,000 ppm. -
Page 30: 4Dmp
Stored data can be viewed on the instrument LCD display or transmitted to your PC computer using our data transfer software. The EGM-4 will store up to 1,000 records in memory. Note, when the memory is full, the oldest record will be overwritten each time additional records are taken. - Page 31 1. Press key 4 (4DMP). 2. Press key 1 (Screen Display). 3. Press the 8 key to display the CO concentration for the last stored record. 4. Press the Y key to view previous records. EGM-4 Operator's Manual – Version 1.00 - 31 -...
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Page 32: Data Dump
Note, some of the displays will vary according the probe type connected. Data Dump To transmit stored data from the EGM-4 to a PC, you must use the data transfer cable and software supplied with the system. Step by step instructions on transferring data from the EGM-4 to the PC are contained in the software Help file. -
Page 33: Data Structure Based On Probe/Sensors
Operation Data Structure Based On Probe/Sensors Please note. The data structure, particularly columns A-J described above, is dependent upon the probe/sensor that is connected to the EGM-4. Probe Description of Sensor Each Column is described as follows Type Connected Sensor Connected. -
Page 34: Error Codes
If an RH sensor is fitted, a Contact PP Systems. (see reading above 90% could mean condensation. Systems’ Contact Information • • Battery voltage to Battery voltage < 10.5v Re-charge battery EGM-4 Operator's Manual – Version 1.00 - 34 -... -
Page 35: Egm Serial Outputs For Use With Windows Data Transfer Program
Cleared” is displayed before returning you to the main menu. If you do not want to clear the database, simply press the N key. 6CLK To view/set the EGM-4 real time clock, press the 6 key. The following message should be displayed: RESET TIME (Y-N)? - Page 36 (i.e. if the time is 8:00 AM, enter 08 for the hour). ! Note ! Do not forget to enter the date as day/month/year and the time based on the 24 hour format. EGM-4 Operator's Manual – Version 1.00 - 36 -...
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Page 37: Diagnostics And Initialisation
400 ppm. 2:ZERO Press key 2 to put the EGM-4 into “Zero” mode. In “Zero” mode, the A/D value for CR should read approximately 40000-50000 if fresh soda lime is present in the absorber column. The CR value in “Zero” mode should always be greater than the CR value in “Measure”... -
Page 38: Maintenance
Maintenance Maintenance The EGM-4 is virtually maintenance free. However, there are a few items that should be watched and cared for periodically. Soda Lime Absorber Column The soda lime absorber column is built into the EGM-4 and safely protected within the enclosure. -
Page 39: Material Safety Data For Soda Lime
Obtain medical attention if skin becomes inflamed. Eye Contact Irrigate thoroughly with clean water. Obtain medical attention. Ingestion Wash out mouth thoroughly. Drink water. Obtain medical attention. HAZARD LABELLING Transport Codes None required. Hazard Classification None. EGM-4 Operator's Manual – Version 1.00 - 39 -... -
Page 40: Servicing The Egm-4
If it reads 0, you have a good fuse. Anything else, the fuse is bad and should be replaced. The EGM-4 enclosure must be removed in order to service the following items: •... -
Page 41: Inside The Egm-4
The EPROM that is used in the EGM-4 must be protected from static electricity. As a result, there are several precautions that the customer should take before removing EPROMS. The risk of damage can be minimized by earthing both the operator and the lab bench surface. -
Page 42: Zero Valve
ZERO Valve If it is suspected that the ZERO valve is not functioning properly, we recommend returning the EGM-4 to our factory for repair as this item is soldered directly to the PC075 circuit board. Contact PP Systems (see PP Systems’ Contact Information). -
Page 43: Removing The 12V Battery
The front panel may need to be removed to slide the battery out of its compartment if it is stuck. When removing the battery, first ensure that the power to the EGM-4 is turned off. Next, remove the red (positive) and blue (negative) charger leads from the battery. -
Page 44: Replacing The Air Sampling Pump
Connect the pump to a 6-12V source and fit a 30mm tube to the pump inlet. (i.e. the EGM-4 can be used to supply power via the pump electrical connector. It is, however, essential that the flushing is performed outside of the instrument to avoid spillage into it). -
Page 45: In-Line Hydrophobic Filter
Maintenance In-Line Hydrophobic Filter If the In-Line Hydrophobic Filter is used with the EGM-4, it is very important to periodically inspect the internal filter and “O” Ring. To check the internal filter: 1. Open the filter holder. 2. Remove internal “O” Ring using a fine screwdriver or similar tool.
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