Model 8730/8731

Q-C

HECK

™

CO

2

Meter

Operation and Service

Manual

August 2000

P/N 1980199 Rev. D

Model 8730/8731

Q-C

HECK

™

CO

2

Meter

Operation and Service

Manual

August 2000

P/N 1980199 Rev. D

SHIP TO:

TSI Incorporated

500 Cardigan Road

Shoreview, MN 55126-3996

USA

U.S.

Sales and Customer Service:

(800) 777-8356/(651) 490-2711

Fax:

(651) 490-2874

MAIL TO:

TSI Incorporated

P.O. Box 64394

St. Paul, MN 55164-0394

USA

INTERNATIONAL

Sales and Customer Service:

+1 651-490-2711

Fax:

+1 651-490-2874

Copyright



TSI Incorporated/August 2000/All rights reserved.

Address

TSI Incorporated/P.O. Box 64394/St. Paul, MN 55164/USA

Fax No.

(651) 490-2874

LIMITATION OF WARRANTY AND LIABILITY . Seller warrants the goods sold hereunder, under normal use and service as described in the operator's manual, shall be free from defects in workmanship and material for (24) months, or the length of time specified in the operator's manual, from the date of shipment to the customer. This warranty period is inclusive of any statutory warranty. This limited warranty is subject to the following exclusions: a.

Parts repaired or replaced as a result of repair services are warranted to be free from defects in workmanship and material, under normal use, for 90 days from the date of shipment.

b.

Seller does not provide any warranty on finished goods manufactured by others or on any fuses, batteries or other consumable materials. Only the original manufacturer's warranty applies.

c.

Unless specifically authorized in a separate writing by Seller, Seller makes no warranty with respect to, and shall have no liability in connection with, goods which are incorporated into other products or equipment, or which are modified by any person other than Seller.

d.

The CO sensor and certain other components when indicated in specifications are warranted for a period of (180) days from the date of shipment to the customer.

The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein. NO

OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR

MERCHANTABILITY IS MADE.

TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER,

AND THE LIMIT OF SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR

DAMAGES CONCERNING THE GOODS (INCLUDING CLAIMS BASED ON CONTRACT,

NEGLIGENCE, TORT, STRICT LIABILITY OR OTHERWISE) SHALL BE THE RETURN OF

GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE, OR, AT THE OPTION OF

SELLER, THE REPAIR OR REPLACEMENT OF THE GOODS. IN NO EVENT SHALL SELLER BE

LIABLE FOR ANY SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL

NOT BE RESPONSIBLE FOR INSTALLATION, DISMANTLING OR REINSTALLATION COSTS

OR CHARGES. No Action, regardless of form, may be brought against Seller more than 12 months after a cause of action has accrued. The goods returned under warranty to Seller's factory shall be at Buyer's risk of loss, and will be returned, if at all, at Seller's risk of loss.

Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY, which contains the complete and exclusive limited warranty of Seller. This LIMITATION OF

WARRANTY

AND

LIABILITY may not be amended, modified or its terms waived, except by writing signed by an Officer of Seller.

Service Policy

Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers, our service policy is designed to give prompt attention to any problems. If any malfunction is discovered, please contact your nearest sales office or representative, or call TSI's Customer Service department at

(800) 777-8356 (USA) and +1 651-490-2711 :(International).

CONTENTS

Chapters

1.

2.

3.

4.

UNPACKING AND PARTS IDENTIFICATION .....................1

Unpacking the Q-C HECK .....................................................1

Parts Identification for the Q- C HECK ....................................2

SETTING-UP ....................................................................3

Supplying Power to the Q-C HECK ........................................3

Installing the Batteries ..................................................3

Using the AC Adapter ..................................................3

Connecting the Optional Model 8925 Portable Printer ...........3

OPERATION ....................................................................5

Overview...........................................................................5

Keypad Functions .............................................................5

ON/OFF Key .....................................................................5

CO

2

Key ...........................................................................5

CO Key (Model 8731 Only) ................................................6

SAMPLE Key....................................................................6

TIME CONSTANT Key .......................................................6

STATISTICS Key ..............................................................6

PRINT Key........................................................................7

é and ê Keys..................................................................7

CALIBRATION AND MAINTENANCE .................................9

Calibrating the CO

2

Concentration Measurement..................9

Calibrating the CO Concentration Measurement

(Model 8731 only)............................................................11

Replacing the CO Sensor.................................................13

Storage Precautions ........................................................14

TROUBLESHOOTING ....................................................15

5.

APPENDIX A

Specifications .................................................................17

APPENDIX B

Internal Dip Switch Settings..............................................19

i

Chapter 1

Unpacking and Parts Identification

Carefully unpack the Q-C

HECK

CO

2

Meter from the shipping container. Use the tables and illustrations below to make certain that there are no missing components. Contact TSI immediately if anything is missing or damaged.

Unpacking the Q-C HECK

Figure 1 - 1

Model 8730/8731 Q-C HECK CO

2

Meter

Quantity Item Description

1

1

Q-C

HECK

CO

2

Carrying Case

Meter

4

1

1

1

AA Alkaline Batteries

AC Adapter (optional)

115 V, NEMA-5

230 V, Eur., CEE 7/16

230 V, Great Britain

240 V, Australian

CO

2

Calibration Collar

1

1

1

CO Calibration Adapter (Model 8731 only)

CO Sensor (installed in instrument,

Model 8731 only)

Q-C

HECK

CO

2

Meter Operation and

Service Manual

Certificate of Calibration

Part/Model

8730/8731

1319114

1206013

2613033

2613078

800169

2613105

801058

801076

801075

1980199

-

1

Parts Identification for the Q-C

HECK

Figures 1 - 2 and 1 - 3 identify the parts of the Q-C HECK CO

2

Meter. Please become familiar with these components before proceeding.

1 7

8

2

3

9

6

5

4

Figure 1 - 2: Q-C

HECK

1. Display

2. Keypad

3. External Power Socket

4. RS-232 Printer Port

5. Location of CO

2

Sensor

6.

7.

8.

9.

Probe Handle

Battery Access Cover

Wrist Strap

Location of CO Sensor

(Model 8731 only)

1

2

3

Figure 1 - 3: Q-C

HECK

Accessories

1. AC Adapter (optional)

2. CO

2

Calibration Collar

3. CO Calibration adapter

(Model 8731 only)

2 Chapter 1

Chapter 2

Setting-Up

Supplying Power to the Q-C HECK

The Q-C

HECK

CO

2

Meter must be powered in one of two ways: four size

AA batteries or the optional AC Adapter.

Installing the Batteries

Insert four size AA batteries as indicated by the diagram located on the inside of the battery compartment. TSI ships the Q-C

HECK

with alkaline batteries. NiCd rechargeable batteries may also be used.

Using the AC Adapter

The AC Adapter allows you to power the Q-C

HECK

from an AC wall outlet. When using the AC adapter, the batteries (if installed) will be bypassed. The AC adapter is not a battery charger and will not charge NiCd batteries.

Connecting the Optional Model 8925 Portable Printer

To connect the Model 8925 printer to the Q-C

HECK

, locate the Printer

Interface cable (supplied with optional printer) and connect the 9-pin end labeled “PRINTER” to the printer and the other end to the data port on the

Q-C

HECK

. Always turn the Q-C

HECK

on BEFORE the printer. If the printer prints question marks (??????), asterisks (******), or random characters, reset it by turning it off and then on again. If necessary, refer to the Model

8925 Portable Printer Operation and Service Manual .

3

Chapter 3

Operation

Overview

The Model 8730 Q-C

HECK

CO

2

Meter measures CO

2 concentration. The

Model 8731 Q-C

HECK

measures CO

2

and CO concentration. Both parameters are measured simultaneously in a single probe.

Keypad Functions

When pressing the keys on the front panel, the Q-C

HECK

will beep to confirm the function. If you press a key and the Q-C

HECK

does not beep, then the Q-C

HECK does not allow that function during the selected mode.

To disable the beep, please refer to Appendix B: Internal DIP Switch

Settings.

ON/OFF Key

Use the ON/OFF key to turn the Q-C

HECK

on and off. When the instrument is first turned on it goes through a preprogrammed power-up sequence that includes an internal self-check. First, all displayable items will appear for a few seconds. If a problem is detected, the display will show the message

“SERVICE” along with a number to indicate that the Q-C

HECK

requires servicing. Refer to Chapter 5: Troubleshooting for information regarding service numbers. If the “SERVICE” message appears, the Q-C

HECK

will pause until any key is pressed.

When the Q-C

HECK

completes its internal self-check, it will display the approximate percentage of battery life remaining. The Q-C

HECK

will display the battery symbol

+ -

when the battery voltage becomes very low.

After the battery symbol appears, the Q-C

HECK

will run for approximately

60 minutes before displaying the message “LO” (for a few seconds) and then automatically turning off. This feature is accurate for alkaline batteries only.

The percentage of battery life remaining will not be accurate for NiCd batteries. The battery symbol will appear when battery voltage becomes low, but the Q-C

HECK

will run considerably less than 60 minutes before displaying the message “LO” and turning off.

CO

2

Key

Press the CO

2

key to display CO

2

readings. The Model 8730 Q-C

HECK always displays CO

2

readings. Carbon dioxide concentration readings will be displayed in units of parts per million (ppm). Place the sensor in the

5

location where you want to take the measurement. The probe must be fully exposed because the CO

2

sensor is located between the probe tip and the handle, not at the tip.

CAUTION: Do not hold the probe close to your breathing zone.

Humans exhale CO

2

and this will influence the readings.

CO Key (Model 8731 Only)

Press the CO key to display CO readings. Carbon monoxide concentration readings will be displayed in units of parts per million (ppm). The CO sensor is located at the tip of the probe.

SAMPLE Key

Press the SAMPLE key to start/stop data sampling. The word “SAMPLE” will appear in the upper right corner of the display while the Q-C HECK is taking a sample. The instrument will keep track of statistics including average, minimum, maximum, and elapsed time. When sampling is stopped, the Q-C HECK will automatically scroll through statistics for the sample that just ended.

TIME CONSTANT Key

Momentarily press and release the TIME CONSTANT key to view the current time constant. To change the time constant, press and hold the key down. The available time constant choices will sequence on the display.

When the desired value is displayed, immediately release the key

The time constant is actually an averaging period. The Q-C HECK display is always updated every second; however, the reading displayed is the average reading over the last time constant period. For example, if the current time constant is set to 10 seconds, the display will show readings averaged over the previous 10 seconds, updated every second. This is also called a 10second “moving average.”

As configured at the factory, the available time constant values are 2, 5, 10,

30, and 60 seconds.

STATISTICS Key

Use the STATISTICS key to sequentially view the average, minimum and maximum readings as well as the elapsed time of the most recently sampled data. You may view sample statistics while the sample is in-progress; however, one time constant must have elapsed first. Press the

STATISTICS key once to display the average reading, again to display the minimum reading, again to display the maximum reading, and again to display the elapsed time for that sample. If you press the STATISTICS key a fifth time, the Q-C HECK will switch back into the currently selected

6 Chapter 3

measuring mode. You must sequence through all four statistic displays (i.e.

press the STATISTICS key five times) before the Q-C HECK will go back into the currently selected measuring mode. The Model 8731 measures CO and CO

2

simultaneously. The display shows only the data for the current measurement mode. The measurement mode may be changed at any time to view statistics for the other measurement.

PRINT Key

Use the PRINT key to print information on the optional Model 8925

Portable Printer. The information printed will be different depending on what the Q-C HECK is currently doing.

When the Q-C

HECK is displaying real-time readings, the PRINT key will cause all parameters being measured to be printed. Each time the PRINT key is pressed, one set of values will print. The values printed reflect the current time constant, therefore, they are the same as would be displayed.

When the Q-C HECK is displaying any statistic, pressing the PRINT key will cause the current statistic to print. All statistics are printed as a set regardless of which one is currently displayed.

If you press and hold the PRINT key during the power-up sequence, and you have the optional Model 8925 printer connected, a printout showing certain system information will occur.

é and ê Keys

The two arrow keys are used to adjust readings when calibrating the

Q-C

HECK

Operation 7

Chapter 4

Calibration and Maintenance

The Q-C

HECK

requires very little maintenance to keep it performing well.

The Q-C

HECK

may be calibrated in the field using the instructions below.

Even so, we recommend that you return your Q-C

HECK

to TSI for annual recalibration. For a reasonable fee, we will quickly recalibrate the unit and return it to you in “as new” working condition along with a Certificate of

Calibration and NIST Traceability. The factory calibration is more precise than can be accomplished with the procedures below. This “annual checkup” helps ensure that the Q-C

HECK

is always in good operating condition.

Calibrating the CO

2

Concentration Measurement

TSI recommends calibrating the Q-C

HECK

CO

2

measurement monthly to help ensure accurate readings. The CO

2

concentration measurement is affected by changes in atmospheric pressure. Normal day-to-day variations due to local weather conditions have little effect; however, changes in altitude can cause more significant errors. For best accuracy, calibrate the

Q-C

HECK

CO

2

measurement for your local conditions or if conditions change.

To calibrate the CO

2

sensor, please follow the procedure below. Brief instructions can also be found on the calibration collar itself. You will need a cylinder of gas with 0 ppm CO

2 for the zero calibration and a cylinder of gas with a known concentration of CO

2

for the span calibration. Contact your local TSI distributor for available CO

2

calibration kits.

If necessary, you can select between the factory CO

2

calibration and a user calibration. Please refer to Appendix B: Internal DIP Switch Settings.

The calibration procedure can be aborted at any time by pressing the CO

2 key.

If an error occurs during the CO

2

calibration procedure, the

Q-C HECK will display the message “ERR” . Press the CO

2

k ey to abort the calibration.

Switching the zero gas with the span gas is an example of a condition that will cause the “ERR” message to come on.

9

1.

Locate the calibration collar and slide it over the sensing probe. Make sure that the collar completely covers the CO

2

diffusion holes. Refer to Figure 4 - 1.

Figure 4 - 1: CO

2

Calibration

2.

Install the regulator onto the zero calibration gas cylinder and connect tubing from the cylinder to the fitting marked “GAS IN” and turn the gas on. Make sure the cylinder is not empty.

3.

To put the Q-C HECK into CO

2

calibration mode, press and hold the CO

2 key. The display will then begin to count down from five to zero.

When the count reaches zero, release the CO

2

key immediately. The words “CALIBRATE ZERO” should appear on the display. If not, try again.

Note: DIP switch 2 must be set to the “User Calibration” (ON) position or the Q-C HECK will not go into CO

2

calibration mode. Please refer to Appendix B: Internal DIP Switch Settings.

4.

Press the SAMPLE key to take a zero measurement. The Q-C HECK will display a 60-second count-down. When the count-down is completed, the display will show the word “CALIBRATE 1” and the arrow symbols

(

éê

) will be blinking. Turn off the regulator and disconnect the zero calibration gas.

5.

Install the regulator onto the span calibration gas cylinder and attach a tube from cylinder to the fitting marked “GAS IN.” Make sure the

10 Chapter 4

cylinder is not empty, then turn the gas on. A CO

2

concentration of between 900 and 5000 ppm should be used.

6.

Use the arrow ( éê ) keys on the Q-C HECK keypad to adjust the display to match the known span gas concentration. Press quickly and release the arrow key to change the display 1 ppm at a time. Hold the arrow key down to move more quickly. The span gas concentration value

(ppm) is marked on the gas container.

7.

Press the SAMPLE key to take a span reading. The Q-C HECK will display a 60-second count-down. When the count-down reaches zero the Q-C HECK will go into Survey mode.

8.

Observe the reading displayed on the Q-C HECK . It should be very close to the span gas concentration (within specifications: See Appendix A).

If not, repeat the calibration.

9.

If the displayed reading is accurate, turn the gas off and remove the calibration collar and regulator. The calibration is now completed.

Calibrating the CO Concentration Measurement (Model 8731 only)

TSI recommends calibrating the Q-C HECK CO measurement monthly to help ensure accurate readings. The CO concentration measurement is affected by changes in temperature and atmospheric pressure. Normal day-to-day variations due to local weather conditions have little effect; however, changes in altitude can cause more significant errors. For best accuracy, calibrate the Q-C HECK CO measurement for your local conditions or if conditions change.

To calibrate the CO sensor, follow the procedure below. You will need a cylinder of pure air for the zero calibration and a cylinder of gas with a known concentration of CO for the span calibration. A CO concentration between 30 ppm and 200 ppm is recommended. Contact your local TSI distributor for available CO calibration kits.

Note: Calibration with CO gas should always be done in a well ventilated area.

If necessary, you can select between the factory CO calibration and a user calibration. Please refer to Appendix B: Internal DIP Switch Settings.

The calibration procedure can be aborted at any time by pressing the CO or

CO

2

key.

Calibration and Maintenance 11

If an error occurs during the CO calibration procedure, the Q-C HECK will display the message “ERR” . Press the CO or CO

2

key to abort the calibration. Switching the zero gas with the span gas is an example of a condition that will cause the “ERR” message to come on.

Figure 4 - 2: CO Calibration

1.

Locate the calibration adapter and slide it over the sensing probe.

Make sure that the adapter completely covers the CO diffusion holes at the tip of the probe.

2.

Install the regulator onto the zero calibration gas cylinder and connect tubing from the cylinder to the inlet of the calibration adapter and turn the gas on. Make sure the cylinder is not empty.

3.

To put the Q-C HECK into CO calibration mode, first put the instrument into Survey mode, and then press and hold the CO key. The display will then begin to count down from five to zero. When the count reaches zero, release the CO key immediately. The words “CALIBRATE

ZERO” should appear on the display. If not, try again.

Note: DIP switch 7 must be set to the “User Calibration” (ON) position or the Q-C HECK will not go into CO calibration mode. Please refer to Appendix B: Internal DIP Switch Settings.

12 Chapter 4

4.

Press the SAMPLE key to take a zero measurement. The Q-C HECK will display a 90-second count-down. When the count-down is completed, the display will show the word “CALIBRATE 1” and the arrow symbols

( éê ) will be blinking. Turn off the regulator and disconnect the zero calibration gas.

5.

Install the regulator onto the span calibration gas cylinder and attach a tube from cylinder to the inlet fitting of the calibration adapter .

Make sure the cylinder is not empty, then turn the gas on.

6.

Use the arrow ( éê ) keys on the Q-C HECK keypad to adjust the display to match the known span gas concentration. Press quickly and release the arrow key to change the display 1 ppm at a time. Hold the arrow key down to move more quickly. The span gas concentration value

(ppm) should be marked on the gas container.

7.

Press the SAMPLE key to take a span reading. The Q-C HECK will display a 90-second count-down. When the count-down reaches zero the Q-C HECK will go into Survey mode.

8.

Observe the reading displayed on the Q-C HECK . It should be very close to the span gas concentration (within specifications: See Appendix A).

If not, repeat the calibration.

9.

If the displayed reading is accurate, turn the gas off and remove the calibration adapter. The calibration is now completed.

Replacing the CO Sensor

The Electro-chemical CO sensor will need to be replace approximately once a year. Conditions that may indicate a sensor needs to be replaced are:

1) the sensor will not hold calibration. 2) the response is very unstable.

Caution must be taken when operating at very low or high temperatures.

Exposing the sensor to sub-freezing temperatures can cause permanent damage to the sensor. Exposing the sensor to high temperature for long periods of time can cause the sensor to dry out which will shorten the sensor life. The sensor has a built in filter to eliminate interfering gasses.

This filter will last the life of the sensor under normal background gas levels. To replace the sensor follow the procedure below.

Warning: The CO sensor contains a corrosive material. Avoid contact with eyes and skin.

1.

Unscrew cap from end of probe.

Calibration and Maintenance 13

2.

Remove the old sensor by gently pulling it straight off the end of the probe. Do NOT twist the sensor as this will damage the connector.

3.

Tear open foil pouch and remove new sensor. Inspect new sensor for visible sings of damage or leakage.

4.

Line up notch on sensor with connector and gently push sensor onto the connector.

5.

Replace sensor cap.

6.

Turn the Q-C HECK on and leave on for approximately 30 minutes to allow the sensor to stabilize. After the stabilization period calibrate the sensor by following the procedure above .

Storage Precautions

When storing the Q-C HECK for more than 30 days, you should remove the batteries. This prevents damage due to battery leakage.

This instrument must be stored in a location where the temperature remains between -20 and 60 °C (-4 and 140 °F) and the relative humidity between

15% and 90%.

14 Chapter 4

Chapter 5

Troubleshooting

The table below list the symptoms, possible causes and recommended solutions for common problems encountered with the Q-C

HECK

.

Symptom

No Display.

Possible Cause

Unit not switched on.

Low or dead batteries.

Corrective Action

Switch unit on.

Replace the batteries or plug in the AC adapter.

Battery symbol is displayed

(constant or blinking).

Dirty battery contacts.

Low battery charge.

Incorrect AC adapter.

Low AC line Voltage.

Clean the battery contacts.

Replace batteries or use AC adapter.

Replace with the correct AC adapter.

Correct the AC line voltage or use batteries.

Cannot enter calibration mode.

Dirty battery contacts.

DIP switch(s) set to factory calibration.

Clean the battery contacts.

Change DIP switch setting.

See Appendix B.

Incorrect function displayed.

“ERR”

Displayed during calibration procedure.

“ SERVICE and “2” displayed.

”

“ SERVICE ” and “4” displayed.

Sample is in progress.

Two keys have been pressed at the same time.

A mistake has been made such as switching the zero and span gases.

Calibration memory error. Internal calibration data corrupted.

CO

2

sensor malfunction.

“ SERVICE ” IR source malfunction.

Stop sample in progress.

Press only one key at a time.

Press CO

2

or CO key to abort calibration. Review instructions and try again.

Factory service required.

Factory service required. Press any key to bypass.

Factory service required. Press

15

Symptom Possible Cause and “6” displayed.

“ SERVICE ” and “8” displayed.

CO signal out of range or

CO sensor malfunction.

Corrective Action any key to bypass.

1. Recalibrate CO sensor.

2. Replace and recalibrate CO sensor.

3. Factory service required.

Press any key to bypass.

16 Chapter 5

Appendix A

Specifications

Specifications are subject to change without notice.

Specifications in parentheses () indicates English equivalents.

CO

2

:

Sensor type:

Range:

Accuracy:

Resolution:

Response time:

Non-Dispersive Infrared (NDIR)

0-5000 ppm

±

3% of reading

±

50 ppm at 25

°

C

(add

±

0.36% of reading per

°

C away from calibration temperature (

±

0.2% of reading per

°

F))

1 ppm

20 seconds (for 63% of final value for 500 ppm step change in still air)

CO (Model 8731 only):

Sensor type:

Range:

Accuracy:

Resolution:

Repeatability:

Response time:

Electro-chemical

0 - 500 ppm

±

3% of reading or 4 ppm whichever is greater (add

±

0.5% of reading per

°C away from calibration temp

(

±

0.28% of reading per °F))

1 ppm

±

2% of reading

< 60 seconds to 90% of final value

INSTRUMENT TEMPERATURE RANGE:

Operating range: 5 to 45

°

C (41 to 113

°

F)

Storage range: -20 to 60

°

C (-4 to 140

°

F)

TIME CONSTANT:

Values 2, 5, 10, 30, or 60 seconds

POWER REQUIREMENTS:

Batteries:

AC adapter:

Approx. battery life:

Four AA-size Alkaline or NiCd

7 VDC nominal, 300 ma, (Q-C HECK mates with 5.5 mm OD x 2.1 mm ID plug, center pin positive(+))

13.5 hours (Alkaline), 4.75 hours

(NiCd)

17

PHYSICAL:

External dimensions:

Probe length:

Probe diameter:

Weight:

Display:

76 mm x 168 mm x 38 mm

(3.0 in x 6.6 in x 1.5 in)

Model 8731: 16.1 cm (6.34 in.)

Model 8730: 11.7 cm (4.60 in.)

1.9 cm (0.75 in)

0.59 kg (1.3 pounds) (with batteries)

4-digit LCD, 15 mm (0.6 in) digit height

MAINTENANCE SCHEDULE:

Factory calibration:

User calibration:

Annually

As needed

PRINTER INTERFACE:

Type:

BAUD rate:

RS-232

1200

18 Appendix A

Appendix B

Internal Dip Switch Settings

To access the DIP switches, remove the batteries from the battery compartment. On the inside of the battery compartment, there is a window with eight DIP switches The table below shows the functions for each switch. Please refer to Figure B - 1 for switch locations.

CAUTION: Make certain that power is turned off before changing DIP switch settings.

Switch OFF

1 Reserved

2

3

Factory CO

2

Cal.

Reserved

6

7

4

5

8

Reserved

Beep Disabled

Reserved

Factory CO Cal.

Reserved

ON

Reserved

User CO

2

Reserved

Reserved

Cal.*

Beep Enabled

Reserved

User CO Cal.*

Reserved

* As shipped the user calibration is identical to the factory calibration

- Factory default settings are indicated with BOLD type.

- The ON position is away from the batteries and OFF is towards the batteries.

- Switch 1 is towards the display and switch 8 is nearest to the data port.

ON

OFF

1

8

DIP SWITCH

Figure B - 1: DIP Switch Location

19