Dwyer 1205A-5 User Manual

Bulletin C-1205A-5

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DISPLAY

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46.04)

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Model 1205A-5 Handheld CO Analyzer

Specifications - Installation and Operating Instructions

Model 1205A-5 Handheld CO Analyzer provides a simple, cost effective

answer to detecting and monitoring colorless, odorless, toxic carbon monox­ide. The portable, battery operated unit measures CO from 0 to 2000 ppm
and can record maximum CO values. Use a Type K thermocouple (sold
separately) to measure temperatures. Simultaneously display two differ­ent functions on the large two-line alpha-numeric LCD. Quickly program
time, date, engineering units, language and other display functions. The
rotary dial allows easy function selections. The analyzer features auto
zeroing, battery indication, infrared printer link, and a backlight display for
low light areas. The Model 1205A-5 is ideal for ambient air monitoring in
residential and commercial markets, flue testing in small boilers, and source
investigation in areas where CO monitors have alarmed. The unit includes
a stainless steel flue probe with filter and flexible tubing, batteries and
instruction manual.

INTRODUCTION

The 1205A-5 meter tests CO levels in heating appliances, ambient air,
around fossil fuel appliances like cookers and grills. It also helps you test
residential and commercial CO alarms and also shows CO MAX - the max­imum level of CO recorded.
The 1205A-5 can also be used as a digital thermometer, ideal for testing
hot water or refrigeration.
A large backlit display shows 2 readings, and all data can be printed via
an optional printer. The printout shows complete data and includes the
date and time.
The 1205A-5’s protective rubber boot has a magnet for “hands-free” oper­ation when using probe to test combustion appliances and ambient air.
The 1205A-5 is controlled using 4 buttons and a rotary dial.

The four buttons (from left to right):

1. Power Switch to turn the meter on and off.

2. Print actual or frozen data and switch on and off the backlight.

3. Switch on and off the pump.

4. “Freeze” or hold data.

SPECIFICATIONS
Range: CO: 0 to 2000 ppm; Temperature: 32 to 1112°F (0 to 600°C).
Accuracy: CO: ±5% of reading; Temperature: ±5°F (2°C).
Display: Alpha-numeric LCD, dual digits.
Ambient Operating Temperature: 32 to 104°F (0 to 40°C).
Operating RH: 10 to 90% non-condensing.
Response Time: 20 to 30 seconds.
Sensor Type: Electrochemical cell.
Calibration: Auto zero function.
Flexible Tubing: 9 ft (3 m) polyurethane tubing with quick fit connec-

tor. Max. temperature: 180°F (82°C).
Flue Probe: 11.8˝ (30 cm) length, stainless steel with quick fit connec­tor to aluminum handle. Max. temperature: 1100°F (600°C).
Temperature Probe: Type K thermocouple with mini-connector (sold
separately).
Power Requirements: (4) AA alkaline batteries, installed functional,
user replaceable.
Battery Life: 8 hours with alkaline batteries (continuous use without
backlight).

Weight: 1.5 lb (0.7 kg).
Agency Approval: CE.

BEFORE USING FOR THE FIRST TIME

Turn over the meter, remove the protective rubber sleeve and fit four
alkaline “AA” batteries in the battery compartment. Replace the battery
cover and protective rubber sleeve.

The buttons with UP, DOWN and ENTER arrows also change settings
such as date, time and the display’s top line.
The rotary dial changes the display’s second line and also accesses the
menu to allow changing the date, time, etc.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

Figure 1 - Installing Batteries

P.O. Box 373 • Michigan City, IN 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

Set the meter’s correct time, date, etc., after it is switched on and cali­brated. See USING THE ROTARY DIAL to the right. The settings will
remain stored after the meter is turned off.

CHECK BEFORE USING EVERY TIME

• The particle filter is not dirty.

• The water trap and probe line are empty of water.

• All hose and thermocouple connections are properly made.

• The probe is sampling ambient FRESH air.

• The water trap and drain plug are fitted correctly to the instrument

• The temperature probe is connected, if required.

Switch ON the instrument by pressing .

SAFETY WARNING

This meter extracts combustion gases that may be toxic in relatively low
concentrations. These gases are exhausted from the back of the instru­ment. This meter must only be used in well-ventilated locations by

trained and competent persons after due consideration of all the
potential hazards.

CONTROLS

Switching ON
the meter

Press button to switch the unit ON in fresh air outside
the property to be tested. This lets the meter auto cali­brate its sensors properly.
ON switch, on the meter beeps four times and displays
on its top line the time and model number. Its bottom
line counts down from 60 until the sensors are ready
to use - this normally takes 20 to 30 seconds but may
take longer as sensors get older. If the meter will not
auto calibrate, its sensors need to be replaced or
recalibrated by an authorized repair center.
When countdown is finished the display’s top line
shows the last sensor function and the bottom line dis­plays whatever the rotary dial is turned to.

Switching
OFF the
meter

Press button to switch the meter OFF. The display
counts down with the pump on to clean the sensors
with fresh air - if the probe is connected, make sure
meter and probe are in fresh air.

Press HOLD/ENTER if you want to stop the count­down and return measurements.

USING THE ROTARY DIAL (STARTING FROM MENU):

Rotating the dial selects the display’s second line, unless MENU is
selected.

MENU

Rotate the dial to MENU and use the UP or DOWN
buttons to select the following function for change:

1 Time – Uses “Military” time as standard: 7am =

07:00, 7pm = 19:00.

2 Date – Select from MM/DD/YY, YY/MM/DD or

DD/MM/YY.

3 The display’s top line – select from the settings

listed below.
4 Temperature units – °F or °C.
5 The display screen contrast.
6 Language – Select from English, French, Spanish,

Italian & German.
7 Service – Password protected for authorized

service personnel only.

TIME & 

Displays Time and Date.

DATE

TEMP

Displays the measured temperature in °F or °C.

If the temperature sensor is broken or open circuit it
displays 000.

CO

CO MAX

Displays Carbon Monoxide (CO) values in PPM.

Displays the maximum CO value in PPM recorded dur­ing the test.

BAT

Displays estimated battery life.

If battery voltage falls below a preset limit, the display
flashes “LOW BAT.” every 10 seconds. See above to
change the batteries or use the optional main adapter.

TAKING MEASUREMENTS
Appliance Measurements

After the countdown is finished and the meter is correctly set up, put its’
probe into the appliance’s sampling point. The ideal sampling point is at
least two flue diameters downstream of any bend.
Put the probe tip in the flue center. With balanced flues, make sure the
probe is positioned far enough into the flue so no air can “back flush” into
the probe.

Using UP/
DOWN/
ENTER
Buttons

Switching on
and off the
backlight

Printing Data

Switching
PUMP on/off

“Freezing” the
display

Press the DOWN button for more than 1 second to
change the display. The Rotary Dial changes the dis­play’s bottom line.
For example, the meter will display CO on its top line
and Temperature on its bottom line if you turn the
rotary dial to TEMP and push the DOWN button until
CO is displayed on the top line.
Use the UP/DOWN/ENTER keys to change settings
(such as time) when the rotary dial is turned to MENU.

Press and release PRINT/BACKLIGHT quickly to
switch backlight.
Press for more than 1 second before releasing to start
the meter printing. Meter displays “PRINTING” until
this is completed.
Make sure the printer is switched on, ready to accept
data and its receiver is in line with the meter’s emitter
(on top of the meter).

The meter normally operates with the pump on. Press
PUMP quickly to turn the pump off and on.

When the pump is switched off, the meter displays
“PUMP OFF” approximately for 30 seconds.

Press HOLD/ENTER to freeze all readings. The dis­play flashes and is printed by pressing the PRINT key.
Press HOLD/ENTER for “live” measurements.

Figure 2 - Taking an appliance test

Use the probe’s depth stop cone to fix it in flue diameters from 1/4 to 3/4
inch, 6 to 21 mm. Its maximum operating temperature is 1112°F/600°C.

Make sure you do not exceed the meter’s operating specifications.
In particular:

• Do not exceed the probe’s maximum temperature.

• Do not exceed the meter’s internal temperature operating range.

• Do not put the meter on a hot surface.

• Do not exceed the water trap’s levels.

• Do not let the meter’s particle filter become dirty and/or blocked.

View data and rotate the dial to see measurement changes as you make
adjustments.

Press HOLD first to “freeze” the readings before printing, then press PRINT.