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OdaLog

®

 Gas Logger User Manual 

P/N: 10-1000 

 Revision: F, Issued: October 2019 

 Page: 17

 

 

 

7  SENSOR OPERATION 

The OdaLog

®

 uses an electrochemical sensor to detect levels of a specific gas in ppm (parts per million). 

The sensor consists of electrolyte and electrodes packaged in a small container with a diffusion barrier which the 
gas passes through. 

A subsequent chemical reaction causes current flow within the sensor to change in relation to the level of gas 
passing through the diffusion barrier.

 

This current output is then interpreted within the OdaLog

®

, displayed on the LCD (in ppm) and recorded in the 

OdaLog

®

’s data-logging chip.

 

Whilst the sensors are designed to react to their specific gas type, there are other gases that will also cause 
chemical reactions within the sensor and some of these are listed in (See Section 7.1). 

7.1  Sensor Cross-Sensitivity 

The presence of other gases can affect the readings of the electrochemical OdaLog

®

 sensors. The chart below 

shows how sensors listed are likely to respond to 100 ppm of various interfering gases. There may be gases not 
on this chart, which also interfere with OdaLog

®

 sensors.

 

Table 4 Sensor Cross-Sensitivity 

 

Approximate response to Interfering Gas at 100 ppm unless noted. 

 

H

2

CO 

SO

2

 

NO  NO

2

  HCN  HCL  NH

3

 

O

3

 

CL

2

 

H

2

 

C

2

H

4

O  C

2

H

4

  CH

4

  CO

2

 

O

d

aL

og

®

 S

en

so

rs

 

H

2

100 

< 2  < 20  < 6  - 20 

N/D 

- 20 

<1 

N/D 

CO 

100 

< 30  - 20  < 20 

N/D 

< 60 

N/D 

< 100 

SO

2

 

130 

< 2 

100 

- 120  < 50 

N/D 

- 50 

N/D 

NO 

30 

100  < 30 

< 20 

N/D 

N/D 

NO

2

 

- 10 

- 1 

100 

N/D 

100 

N/D 

HCN 

350 

< 1 

160  - 10  - 10  100  N/D 

N/D 

- 50 

N/D 

< 1 

NH

3

 

100 

60 

20 

N/D 

100  N/D 

- 50 

N/D 

CL

2

 

- 25 

- 1 

100 

N/D 

100 

N/D 

 

 N/D:  No Data 

 

 

7.2  Effects of Environmental Changes on OdaLog

®

 Sensors 

7.2.1  Temperature 

The operating temperature range of OdaLog

®

 sensors is -10°C to +40°C (14

o

F to 104

o

F) and within this range 

the sensors are temperature compensated, although extreme temperature swings may cause sensor drift until the 
temperature sensor stabilises.  

Due to the temperature sensor being located within the OdaLog

®

 body, there is a stabilisation time of up to an 

hour when significant temperature changes occur. 

 

Summary of Contents for OdaLog LL

Page 1: ...se other than in the operation or maintenance of the OdaLog portable gas logger OdaStat OdaStat G Software Copyright 2008 Thermo Fisher Scientific Australia Pty Ltd GENERAL DISCLAIMER This Manual summ...

Page 2: ...CTION MANUAL LOGGING MODE ONLY DEFAULT ENABLED 10 6 6 STOP LOGGING FUNCTION MANUAL LOGGING MODE ONLY DEFAULT ENABLED 10 6 7 AUTO LOG START FUNCTION DEFAULT DISABLED 11 6 8 IRDA INFRA RED DATA COMMUNIC...

Page 3: ...PARTS 30 10 3 GAS TEST KITS 31 10 4 REPLACEMENT TEST GAS CYLINDERS 31 11 WARRANTY 32 11 1 WARRANTY 32 11 2 WHAT THE WARRANTY DOES NOT COVER 32 11 3 WHAT THERMO FISHER SCIENTIFIC WILL DO 32 11 4 LIMIT...

Page 4: ...GROUP IIC THIS CONDITION DOES NOT APPLY FOR GROUPS IIA AND IIB Table 1 Approved Battery Types Manufactures Part Number Code Type Size Saft LS26500 Lithium C Tadiran TL 5920 S Lithium C 1 3 Electromagn...

Page 5: ...SIGNED TO OPERATE AS A SAFETY DEVICE WHEN ENTERING CONFINED SPACES AND TOXIC HAZARD ENVIRONMENTS ALL APPROPRIATE REGULATIONS AND OCCUPATIONAL HEALTH AND SAFETY PRECAUTIONS SHOULD BE STRICTLY ADHERED T...

Page 6: ...ogged data without the need for any disassembly The extra large easy to read LCD makes the OdaLog simple to use and interpret instrument data and settings on site The instrument main features can be v...

Page 7: ...OdaLog Gas Logger User Manual P N 10 1000 Revision F Issued October 2019 Page 4...

Page 8: ...of the OdaLog instrument with sensors fitted should be limited to the temperature range of 0 C 32 F to 25 C 75 F and between 20 to 80 RH The following is a list of gas types available for the OdaLog...

Page 9: ...lphabetic characters some numerical values displayed on some screens 3 Battery Level Indicator Displays the battery levels 4 stage depletion see Section 6 12 4 Communications Symbol Indicates if the i...

Page 10: ...using supplied calibration fitting Part No 11 0001 at the flow rate and for the flow time as detailed in Table 5 or until reading stabilises and record End Level result when reading stabilises See Sec...

Page 11: ...OdaLog Gas Logger User Manual P N 10 1000 Revision F Issued October 2019 Page 8 6 OPERATION 6 1 Operation Overview...

Page 12: ...the button during the countdown routine will cause exit to OFF screen Note 2 Peak is constantly updated when OdaLog is in use The Peak value is reset at switch on and at the start of each logging sess...

Page 13: ...ay and the LED s on either side of the display flashing once every 10 seconds Default Enabled can be changed in the OdaStat G software Note 1 If the Logger memory is full and you have Stop log when fu...

Page 14: ...e they are functioning correctly 6 8 2 Exit IrDA mode Infra Red Data Communication Mode Pressing the button when in IrDA mode or waiting 75 seconds for unit to time out will cause the instrument to ex...

Page 15: ...R device to your PC and install the OdaStat G software package Open the OdaStat G software package on your PC and ensure communication setting are configured correctly to communicate with your OdaLog...

Page 16: ...mmunication mode 6 9 3 Pairing Instrument with PC The Odalog instrument must be paired with the PC before the communication can be established Pairing procedures Enter BTPAIR mode on the instrument LC...

Page 17: ...ss Auto Log Start is active See Section 6 7 Note 2 Releasing the button during the countdown routine will cause exit to instantaneous screen 6 11 Clear Logged Data Switch instrument OFF Press hold but...

Page 18: ...the word FLAT continuously on the display with the Battery Warning symbol flashing Note The instrument cannot be turned back on until the battery has been replaced Refer Section 8 1 1 for battery repl...

Page 19: ...fault Enabled This function is activated via the OdaStat G software package Instrument Parameters section by selecting the Suppress Negative Reading option Once active the instrument suppresses all ne...

Page 20: ...rs listed are likely to respond to 100 ppm of various interfering gases There may be gases not on this chart which also interfere with OdaLog sensors Table 4 Sensor Cross Sensitivity Approximate respo...

Page 21: ...onments See Section 9 8 7 2 3 Pressure Sensors may exhibit effects to changes in pressure For example an increase in pressure may result in an increase in gas reading For this reason we do not recomme...

Page 22: ...a replacement part Only use Thermo Fisher Scientific replacement parts The OdaLog should be switched off when not in use and stored in a clean and dry environment as usually found in a normal office...

Page 23: ...ew battery that the positive terminal insulator is not damaged this insulator may cause the battery to break contact if the insulator tab damaged Figure 3 Removing Battery and Replacing Battery Smear...

Page 24: ...in the OdaStat G software package Note Some sensors will require up to 24hrs to settle after battery replacement Figure 4 Top Cap Alignment 8 1 2 Filter Replacement Figure 5 Filter Replacement Ensure...

Page 25: ...p retaining screws DO NOT OVERTIGHTEN Note 1 Filter orientation is important Ensure that the replacement filter is correctly placed with the shiny side facing outward Note 2 Some sensor filters are fi...

Page 26: ...ixtures than others particularly hydrogen sulphide Advice in relation to suitability of regulators tubing should be sought from the calibration mixture supplier 9 3 Tools and Test Equipment The follow...

Page 27: ...Minimum Flow Rate ml min Gas flow time Hydrogen sulphide 50 ppm H2S 250 500 5 Minutes H2S 250 500 15 Minutes Carbon monoxide 500 ppm CO 250 500 3 Minutes Sulphur dioxide 20 ppm SO2 500 5 Minutes Nitr...

Page 28: ...trument is in Null mode Place magnetic base of Allen Tool Part No 11 0000 provided on the left hand side of the LCD display above the wording NULL DONE will appear briefly and the LCD will return to t...

Page 29: ...After waiting for the time shown in Table 5 the gas reading on screen should have stabilised and calibration can be performed as follows Ensure gas is still flowing over sensor Press hold down button...

Page 30: ...rning off gas regulator and removing calibration fitting Ensure that reading returns to close to zero within 5 minutes in clean air and re zero if necessary Note The instrument will TIMEOUT and return...

Page 31: ...commended flow rate and time or until reading stabilises as detailed in Table 5 Record reading This will be the Start Level note reading in relation to level stated on calibration mixture cylinder 9 8...

Page 32: ...ration gas at the end of a logging period N B The above decay compensation assumes gas exposure to the sensor has occurred in a uniform way rather than in large bursts Accordingly we have used a strai...

Page 33: ...ent seals o rings new filter s grill button cover moisture absorbtion pack s 22 0002 Button Cover Moulded Pk 10 02 0136 Lithium Battery Tadiran TL 5920 S 02 0137 Lithium Battery Saft LS26500 13 0107 2...

Page 34: ...itrogen dioxide 10ppm Hydrogen cyanide 10ppm Hydrogen chloride 10ppm Ammonia 50ppm Chlorine 5ppm Hydrogen 200ppm Ethylene Oxide 5ppm Nitrogen 100 VOL Oxygen in Nitrogen 20 9 VOL 10 4 Replacement Test...

Page 35: ...ed costs including without limitation costs incurred in replacing filters or gaskets This warranty is subject to Thermo Fisher Scientific s terms and conditions of sale 11 4 Limitations The obligation...

Page 36: ...arge FAILED Sensor failure during Span operation INST Instantaneous measurement IrDA Infra Red Data Communication Mode MEMORY Logging memory used Status Menu Start logging Main Menu MEMORY FULL Data l...

Page 37: ...OdaLog Gas Logger User Manual P N 10 1000 Revision F Issued October 2019 Page 34 14 Appendix B CERTIFICATES...

Page 38: ...OdaLog Gas Logger User Manual P N 10 1000 Revision F Issued October 2019 Page 35...

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