UEi C75 User manual

C50/C75
INSTRUCTION MANUAL
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

Introduction
The C50/C75 enables HVAC professionals to accurately test andservice all
residential combustion appliances. The extra large backlit LCD displays tw o
parameters at one time.Easily choose the desired combustion param eter
with the rotary selector. The optional printer allows you to print your
readings to document your test results.
Features include
• Choose combustion parameter with a rotary selector
•Measure flue temperature and oxygen (C75: also carbon monoxide)
• Calculates carbon dioxide, gross & net efficiency, and excess air
(C75: also carbon monoxide air free)
• Large backlit LCD, 2 line display
• Protected boot with an integral magnet
• 1 ppm accuracy
• Infrared printer port
• User programmable header
• 16 position memory
Safety Notes
Before using this meter, read all safety information carefully. In
this manual the word "WARNING" is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION" is used to indicate conditions or actions that may
damage this instrument.
WARNING!
This analyzer extracts combustion gases that may be toxic in relatively
low concentrations. These gases are exhausted from the back of the
instrument. This instrument must only be used in well-ventilated
locations. It must only be used by trained and competent persons
after due consideration of all the potential hazards.
C o n t r ols and Indicators
1. Display
2. Infrared Printer Port
3. ON/OFF: Turns analyzer ON and OFF.
4. Print/Back-Light: Print data (Press andhold until
“PRINTING”appears) / Hold to toggle back-light ON or OFF.
5. Pump/Top Line: Turns pump ON and OFF / Hold to scroll
through top line display (also selectable through menu).
6. | | Hold/Store: Freezes reading on display. Entire display flashes.
Press and hold for 2 seconds to store data in memory.
7. Rotary Selector
8. Particle Filter
9. Water Trap
10. Analyzer Connections
Main Display Parameters
O2 : Oxygen reading in percentage (%).
Tf : Te m p e rature ismeasured by the flue gas probe inCentigrade
or Fahrenheit. Will show ambient temperature after fresh air
cal i b ration and “----” if the flue probe is disconnected.
CO : Carbon Monoxide reading displayed in ppm (parts per
million). “- - - -” is displayed if there isa fault with the CO
sensor or the instrument has not set to zero correctly,
switch off instrument and try again.
CO a: Carbon Monoxide air-free reading referenced to an oxygen
levelof 0%. Do not confuse this reading with the actual CO
reading as detailed above.
CO 2:Carbon Dioxide calculation determined by the type of fuel.
This only shows a reading when a combination test is being
carried out. “--- - ” is displayed while infresh air.
∆T : Net temperature calculated by deducting the A MBIENT
(or INL ET) temperature from the measured FL UE
temp erature. Displays in either Centigrade (˚C) or Fahrenheit
(˚F) and will display “-- --” if the flue probe is not connected.
EFF (G): Combustion efficiency calculation displayed in percentage.
Gross (G) or Net (N) can be set (see MENU). The calculation
is determined by the fuel type anduses the calculation in
British Standard BS845. The efficiency is displayed during a
combustion test, “--- -” is displayed while in fresh air.
XA IR % : Excess air calculated from the measured oxygen and type of
fuel used. Displays reading during a combustion test. “--- - ” is
displayed while in fresh air.
AM B : Boiler air INL E Ttem perature used to calculate the
NET temp eratur e
C50/C75-MAN P. 1
2
1
3
4
5
6
7
8
9
10

Probe Configuration
Operating Instructions
Before Use Each 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 flue gas probe is sampling ambient FRESH air
•The water trap is fitted correctly to the instrument
•The flue temperature plug is connected
•The inlet temperature probe is connected if required
Switch ON the instrument by pressing “ “.
After switch-on, the analyzer will scroll through the following
information while performing a zero countdown:
•Currently Set Date
•Currently Set Time
•Remaining Battery Level
• Fuel Selected
•Model and Analyzer Firmware Level
NOTE: The count begins at 59 seconds, and will display the
parameter selected with the rotary knob when the sensors are
detected as stable. If the analyzer will not auto-zero, the sensors are
in need of replacement and the unit should be returned to the
authorized service center.
CO /C O 2: The CO /CO2 ratio is the ratio of measured CO divided
by calculated CO2 .
It gives an indication of:
•How good a gas sample the instrument is reading
•How clean the boiler is running
For example: A new or clean domestic boiler will display a ratio of less
than 0.004, a unit in need of cleaning 0.004 - 0.008 and a unit in need
of major overhaul will show greater than 0.008.
This only shows a reading when a combustion test is being carried out.
“--- - ” is displayed while in fresh air.
:Displays the approximate battery levelas follow s :
•Full battery level
•B a t t e rya t 75 %
•B a t t e rya t 50%
•B a t t e rya t 25%
When the display flashes this, it indicates the batteries are at less than
10% of charge and should be replaced, readings may be affected if the
analyzer is used with low power batteries.
DATE: Date shown as day, month and year.The order can be
changed using the menu function. Date is stored with a
combustion test.
TIME: The time is shown in hours and minutes, these details are
stored with each combustion test.
NOT E : When changing the batteries on the instrument the
memory will store the date and time for up to one minute,
if outside thistime it may be necessary to re-enter the details.
C50/C75-MAN P. 2

Analyzer Connections
NOTE: Take care when inserting the temperature probes as the pins are
polarized. Insert with the smaller pin (+) to the right. A view of the
sockets is shown below.
Automatic Calibration
During this sequence the analyzer pumps fresh air into the Oxygen and
CO (C75 only) sensors to allow them to be set to 20.9% and zero
respectively. See “Setting Inlet Temperature) for information on options.
Changing the Display
The parameters on the first line display are selected from the following
using the pump key (press and hold for display item to change). Certain
items are available on the lower display by selecting with the rotary dial.
*Available on the second line of the display.
C50/C75-MAN P. 3
Setting Inlet Temperature
During the automatic calibration sequence the burner INLET (Ti)
temperature used in the NET temperature calculation is stored in the
analyzer. There are two methods of storing the INLET temperature.
A. Without the flue probe connected temperature inside the analyzer
is used (ambient temperature).
B. If the flue probe is connected the temperature of the probe tip is
used. This can be useful when the temperature of the air entering
the burner is different than the ambient temperature of the room.
NOTE: On ducted inlets, insert the probe tip into the inlet air during the
zero countdown. The analyzer will then store this temperature as the
ambient (inlet) for use in efficiency calculations. Do not sample flue gas
during the zero countdown.
WARNING!
If the INLET temperature is set incorrectly, then errors will be made in
the calculation of net temperature and efficiently.
Sampling the Flue Gas
Once the automatic calibration procedure has been completed and the
specific fuel has been selected (see menu options) the probe can be
inserted into the desired sampling point.
It is recommended that the sampling point be located at least two flue
diameters downstream of any bend, as close to the source as possible,
and that the probe tip is in the center of the flue. With balanced flues
and other domestic units the probe should be positioned far enough
into the flue so that no air can “back flush” into the probe.
The probe depth stop cone provided with the instrument allows the
probe to be used in holes whose diameters range from 1/4 to 4/5 inch
(6 mm to 21 mm).
The standard probe is rated at 1112˚F (600˚C).
TIP: To conserve battery power, switch off the pump when you are not
taking a measurement. To turn pump ON or OFF press “ “.
View data and rotate the dial to see flue changes as you make
adjustments. Press “HOLD” first to freeze or store the readings
before printing.
Display Item Note
NAT GAS* Fuel selected Fuel indicator
•NAT Gas Natural Gas
• Propane
• Butane
• L Oil Light Oil
• LPG Liquid Petroleum Gas
R 0.0000 CO/CO2 ratio Measured CO divided by calculated CO2
P 0.00 Poison index CO/CO2 ratio x 100
AMB xx Ambient temperature Either instrument internal temperature or
(used as inlet stored inlet temperature set during zero
temperature for ∆T) countdown
COa CO air free reading CO reading adjusted to 0% O2 (C75 only)
O2 O2 Ref O2% reference value to calculate readings
normalized to a set O2 level.
hh:mm:ss* Time Currently set time
MM/DD/YY* Date Currently set date
CO2* Carbon Dioxide Calculated CO2 value
O2* Oxygen Measured O2 value
∆T* T Nett Difference between Flue Temp and Ambient
(or inlet temperature)
TF* T Flue Measured Flue Temperature
η(G, N or C)* Efficiency Displays calculated efficiency when O2
values are less than 18%. Displayed as
ηN, ηG or ηC as selected by the user.
Losses (C50 only) Losses calculated from Oxygen and type of
fuel. Displays reading during a combustion
test. “----” is displayed while in fresh air.
CO* Carbon Monoxide Displays Carbon monoxide values in PPM as
(C75 only) CO. Display value in mg/m3as COm.
*Battery level
λ*Excess Air
Flue (Tf) temperature
socket
Mains adapter socket Flue gas inlet
Water trap drain plug

Regular Checks During Sampling
Care must be taken at all times not to exceed the analyzer’s operating
specifications. In particular ensure the following:
•Do not exceed the maximum temperature of the flue probe
•The analyzer internal temperature does not exceed normal
operating range
• DO NOT PLACE THE INSTRUMENT ON A HOT SURFACE
•The water trap is correctly attached at all times - Water condenses
in the probe line and can quickly fill the water trap when the
probe is moved - Take care and watch the water trap closely
•The particle filter is clean and does not become blocked
Normal Shutdown Sequence
WARNING!
Turning the pump off while the probe is in the flue will leave toxic
gases inside the analyzer. Once data has been printed or copied it is
advisable to purge the unit with fresh air as soon as possible. To do
this, with the probe removed from the flue, turn ON the pump. Always
allow the readings to return to zero (20.9 for O2) prior to shutting
the unit off. (C75 only: The meter will not switch off until the CO
reading is below 20 ppm)
WARNING!
The probe will be hot from flue gases.
Remove the probe from the flue and allow it to cool naturally. Do not
immerse the probe in water, as this will be drawn into the analyzer
and damage the pump and sensors. Once the probe is removed from
the flue and the readings have returned to ambient levels hold down
“ “ and switch off the analyzer.
The instrument will count down from 30 to switch off.
If you pressed “ “ by mistake, pressing “ | | “ will return you to
normal operation.
Moving Through the Menu
The options in the menu system are in the following sequence by
pressing the down arrow:
Note: The menu choices are selected using the text printed on the case
above the function keys. The three keys are “ “ increases,
“ “ decrease and “ “ enter.
Set Time
1. Press “ENTER”.
2. Use the up and down keys to select the correct time.
3. Press “ENTER” to move to the next digit.
Note: Time is displayed in military format, example 7:00 pm
is 19:00.
Date
1. Press “ENTER”.
2. Select desired format for the date display.
• MM-DD-YY for month-day-year
• YY-MM-DD for year-month-day
• DD-MM-YY for day-month-year
3. Press “ENTER”.
4. Use the up or down arrows to select the correct data.
5. Press “ENTER” to move to the next digit and then exit.
TOP LINE
1. Press “ENTER”.
2. Use the up or down arrows to display desired data.
3. Press “ENTER” to save and exit.
Note: This can also be changed by pressing the “ “ key
when in normal mode more than 4 seconds.
C F
1. Press “ENTER”.
2. Select degrees displayed in Fahrenheit or Centigrade using the
up or down keys.
3. Press “ENTER” to save and exit.
CONTRAST
1. Press “ENTER”.
2. Select a value between 02 and 254 for desired contrast using
the up or down keys.
Note: Lower values result in a darker display.
SET FUEL
1. Press “ENTER”.
2. Select desired fuel using the up or down keys.
• Choices are Natural Gas, Light Oil, Propane, Butane and
Liquefied Petroleum Gas
3. Press “ENTER” to save and exit.
LANGUAGE
1. Press “ENTER”.
2. Select the desired language using the up or down keys.
3. Press “ENTER” to save and exit.
Header
1. Press up or down and “ENTER” to select desired header.
2. 2 lines of up to 16 characters will appear on the printout.
Store
1. Log - saves a set of test results when “ENTER” is pressed.
2. DEL ALL - clears all the memory when “YES” and “ENTER”
are pressed. Note: “ENTER” must be pressed to exit
this mode.
3. View
• The test number appears on the top line
• Rotate the dial position to displays the stored values
• Press up or down to display different tests
• Use “ENTER” to exit this mode
O2 Reference
1. This can be set between 0 and 20% to reference your readings
to a specific oxygen value.
C50/C75-MAN P. 4

C50/C75-MAN P. 5
N G Cond
1. Press “ENTER”.
2. Select “N” for Net, or “G” for Gross or “COND” to
calculate efficiency.
• Gross Efficiency uses the gross calorific value of the fuel and
deems that the latent heat of vaporization is lost up the flue
of the appliance and is taken as a loss. Gross is used in the
UK and USA
• Net Efficiency uses the net calorific value and assumes the
latent heat is not lost up the flue - For Natural gas this
efficiency can be 11% higher than the Gross Figure - Net is
used in France and Germany
• COND is for efficiency of condensing appliances
3. Press “ENTER” to save and exit.
PPM MG
1. Press “ENTER”.
2. Select “PPM” for parts per million or “MG” for mF/M3
(milligrams per cubic meter) using the up or down keys.
3. Press “ENTER” to save and exit.
SERVICE
1. The service mode is used for repair and calibration, and
should only be entered by authorized service facilities.
2. The firmware can be displayed by entering “2222” for
the code.
You may exit the menu at any time by rotating the selector to a
different position unless the final logical “ENTER” is pressed, no
changes are made.
The exception is: STOREDELETE where the “ENTER” key must be
pressed to confirm the change and exit. If you rotate the dial before
pressing “ENTER” the instrument will be continuously. You must rotate
the dial back to “MENU” and press “ENTER” before you can continue.
In STOREview mode the rotary dial is used to select the saved
parameter to be displayed. Use the “UP/DOWN” keys to change the
test number. To exit the view mode press “ENTER”.
Storing Test Results
At any time during a test you may store the readings in one of the 1
memory positions. Press “||” and hold for 2 seconds or more.
Printing Information
Supplied as an accessory for the analyzer is an infrared thermal printer.
Read the manual supplied with the printer prior to operation.
Connection to the analyzer is detailed below:
•Infrared thermal printer - this does not require a cable to
transmit the data but uses an infrared (IR) link similar to a TV
remote control. The IR emitter is positioned on the top of the
analyzer and the bottom of the printer. Ensure they are pointing
at each other and within 3 feet, with no obstructions in the way.
Data may be lost if transmission is interrupted. Keep the analyzer
pointing at the printer until the printout has finished.
Printing A Test
During combustion tests the analyzer can print data on request. With
the analyzer showing the data, press and hold the “ “ push-button
until “PRINTING” is displayed.
The standard printout is:
*C75 only
**C50 only
NOTE: Printouts of stored
readings will also include
the TEST NO. below the
header.
EFF% (G) = gross
EFF% (N) = nett
EFF% (C) = condensing
SMOKE area on printout
is for adding data from
manual test.
UEI C75
16 character header
16 character header
503 644 8723
Date: 06-26-02
Time: 14:27
Fuel NATU
GAS
O2 % 20.9
CO2 % 0.0
CO* PPM 00
COa* PPM 00
NETT. F ----
AMB F ----
EFF% (G) ----
XAIR % ----
LOSSES** % ----
CO/CO2 ----
PE %
O2 ref %
SMOKE................................................................

C50/C75-MAN P. 6
Combustion Efficiency Calculation
The efficiency calculation is based upon British Standards BS845.
This identifies three sources of loss associated with fuel burning:
Losses due to flue gasses: Dry Flue gas loss, moisture and
hydrogen, sensible heat of water
vapor, unburned gas
Losses due to refuse: Combustible in ash, riddlings
and dust
Other losses: Radiation, convection, conduction
other unmeasured losses
Net efficiency calculations assume that the energy contained in the
water vapor (formed as a product of combustion and from wet fuel) is
recovered and the wet loss term is zero. Gross efficiency calculations
assume that the energy contained in the water vapor is not recovered.
Since the fuel air mixture is never consistent there is the possibility of
unburned/partially unburned fuel passing through the flue. This is
represented by the unburned carbon loss.
Losses due to combustible matter in ashes, riddlings, dust and grit,
radiation, convection and conduction are not included.
Efficiency Calculation:
Known Data - Fuel: Qgr = Gross Calorific Value (kJ/kg)
Qnet = Net Calorific Value (kJ/kg)
K1 = Constant based on Gross or net Calorific Value
K1g = (255 x % Carbon in fuel)/Qgr
K1n = (255 x % Carbon in fuel)/Qnet
K2 = % max theoretical CO2(dry basis)
K3 = % Wet loss
H2= % Hydrogen
H2O = % Water
Measured Data: Tf = Flue Temperature
Ti = Inlet Temperature
O2m = % Oxygen in flue gas
O2r = Oxygen reference %
Calculated Data: Tnet = Net Temperature
% CO2content in flue gas
% Dry flue gas losses
% Wet losses
% Unburned carbon loss
% Efficiency
Tnet = Flue Temperature - Inlet Temperature
(or ambient)
D ryflue gas loss % = 20.9 x K1 x (Tnet)/K2 x (20.9 - O2m)
Wet loss % = 9 x H2+ H2O/Qgr x [2488 + 2.1 Tf - 4.2 Ti]
Simplified = [(9 x H2+ H2O)/Qgr] x 2425 x [1 + 0.001 Tnet]
Wet loss % = K3 (1 + 0.001 x Tnet)
Where K3 = [(9 x H2+ H2O)/Qgr] x 2425
C o m b u s t i o n
Combustion Theory
In its simplest form, combustion is the combining of oxygen (O2) from
the air with hydrogen (H) and carbon (C) from the fuel to form carbon
dioxide (CO2), water (H2O) and energy (light and heat).
Perfect combustion occurs when all of the carbon and hydrogen in the
fuel unite with all of the oxygen supplied by the air. This is also referred
to as “STOICHIOMETRIC Combustion”.
In the real world perfect combustion is nearly impossible to achieve.
When tuning a combustion appliance, the goal is to come close to this
target to minimize losses and excess emissions. One method is to
adjust the amount of air supplied to the combustion area. Too little
combustion air, and there will not be enough oxygen to unite with the
hydrogen and carbon. This will result in partially burnt fuel, and the
creation of carbon monoxide (CO), smoke, and lower efficiency. Too
much air will also lower efficiency because the high amount of excess
air draws heat away from the combustion area up the flue (increase
in _T, difference between flue temperature and ambient or inlet). If
the amount of excess air is too high, it will also move past the heat
exchanger too quickly, resulting in a lower amount of heat transferring
to the target.
Below is a graph of typical combustion, showing the point of perfect
combustion and an approximate location for ideal combustion. You
will notice that by moving farther to the right on the air rich side (high
amounts of excess air), the pollutants (CO) don’t drop any further.
This is where you only lower efficiency. On the left side (fuel rich or
starved for air) you see a dramatic increase in carbon monoxide (CO),
indicating that a portion of the fuel is not being converted to heat.

C50/C75-MAN P. 7
Net efficiency % = 100 - dry flue gas losses
= 100 - 20.9 x K1n x (Tnet)/K2 x (20.9 - O2m)
Gross efficiency % = 100 - {dry flue gas losses + wet losses}
= 100 - {[20.9 x K1g x (Tnet)/K2 x (20.9 - O2m)]
+ [K3 x (1 + 0.001 x Tnett)]}
Excess Air = [20.9/(20.9 - O2m) - 1] x 100
CO2% = [(20.9 - O2m) x K2/20.9]
Unburned = K4 x CO/(CO + CO2)Note: CO scaled in %
fuel loss %
Where K4 = 70 for coke
= 65 for anthracite
= 63 for Bituminous coal
= 62 for coal tar fuel
= 48 for liquid petroleum fuel
= 32 for natural gas
The formula for K4 is based on the gross calorific value Qgr. To obtain
the loss based on net calorific value multiply by Qgr/Qnet. Since this
loss is usually small, this conversion has been ignored. This loss is
subtracted from the efficiency.
CO AIR-FREE and Converting to mg/m3
Certain standards (ANSI Z21.1) for Carbon Monoxide are stated in terms
of air-free. Air-free refers to the concentration of CO in combustion
gases undiluted with flue, or other gases containing little CO. This
value is computed using an equation that takes into account the O2
concentration of the flue gas.
If 5% is measured (O2m) in the flue then the CO gas value will be
recalculated as if 0% were measured. The equation for air-free is
as follows:
COa = CO PPM x [(20.9) / (20.9 - O2m)]
In our example if a reading of 325 PPM were measured then the air-free
value would be calculated as follows:
COa = 325 PPM x [(20.9) / (20.9 - 5)]
COa = 325 PPM x [(20.9) / (15.9)]
COa = 427
We may be given a limit on our furnace by the local authority, which
stated that we must not emit more than 400-PPM Carbon Monoxide
air-free. In the example we would be breaking the limit and corrective
action should be taken to reduce the level of CO.
Air-free values prevent false readings being submitted, e.g. allowing
more air into the boiler will increase the oxygen level in the flue and
dilute any toxic gas reading. Air-free referencing gives readings as if
they were undiluted.
What Does Oxygen Reference Mean?
Oxygen referencing is required by some regulations in various areas. if
a reference value is selected then the CO gas measurement will be dis-
played with the symbol (n) attached to the reading i.e. PPMn.
If 3% O2 reference (O2r) is selected and 5% O2 is measured (O2m)
in the flue then the CO gas value will be recalculated as if 3% were
measured. The equation for referencing is as follows:
CO PPMn = CO PPM x (20.9 - O2r) / (20.9 -5)
In our example if a reading of 95 PPM were measured then the refer-
enced value would be calculated as follows:
CO PPMn = 95 PPM x (20.9 - 3) / (20.9 -5)
CO PPMn = 95 PPM x (17.9) / (15.9)
CO PPMn = 107
We may be given a limit on our boiler by the local authority which stat-
ed that we must not emit more than 100 PPM Carbon Monoxide refer-
enced to 3% Oxygen. In the example we would be breaking the limit
and corrective action should be taken to reduce the level of CO.
Oxygen referencing prevents false readings being submitted, e.g. allow-
ing more air into the boiler will increase the oxygen level in the flue and
dilute any toxic gas reading. Oxygen referencing gives readings as if
they were undiluted.
Oxygen referencing is also referred to as:
•Normalizing
•Diluted and Undiluted readings
• “Air Free” measurements when referenced to zero % oxygen
Converting ppm to mg/m3
To convert Carbon Monoxide to mg/m3= CO ppm x 1.25

C50/C75-MAN P. 7
Charging
Ensure that you use the correct charger. This unit uses a 9V DC
regulated charger.
Ensure that the batteries are fitted in the correct manner, and then
charge for at least 16 hours. Subsequent charges should be overnight.
NiMH batteries may be charged at any time, even for short periods to
conduct testing.
WARNING!
Under NO circumstance should you expose batteries to ex t reme heat or
fire as they may explode and cause injury. Always dispose of oldbatteries
promptly in a manner consistent with local disposal regula tion s.
Emptying and Cleaning the In-line Water Trap
The in-line water trap should be checked and emptied on a regular
basis. Water vapor will condense in the probe line, which may cause the
water trap to fill suddenly if the probe is moved. Care should be taken
at all times.
Carefully remove the rubber plug from the bottom of the water-trap
housing. Dispose of the condensate in a suitable drain, care must be
taken as it could be acidic.
If condensate spills onto the skin or clothing, clean off immediately
using fresh water, seek medical advice if problems occur. Ensure plug is
replaced before performing combustion tests.
Changing the Particle Filter
This is a very important part of the analyzer and should be changed
regularly. It prevents dust and dirt particles from entering the pump
and sensors that will cause damage. The filter MUST be changed when
it appears discolored.
Remove water-trap assembly from the analyzer as shown above.
Remove the filter and plastic holder from the housing. Discard the filter
element but keep the holder to fit to the new filter. Clean the inside of
the filter housing with a suitable soft cloth. Fit the holder onto the new
filter element and then insert into the housing. Refit the housing onto
the analyzer.
Hook slides
out of dock
Slide outward
Pull plug out
to drain
Insert a new filter
M a i n t e n a n c e
Periodic Service
WARNING!
Repair and service of this instrument is to be performed by qualified
personnel only. Improper repair or service could result in physical
degradation of the instrument. This could alter the protection from
personal injury this meter provides to the operator. Perform only those
maintenance tasks that you are qualified to do.
These guidelines will help you attain long and reliable service from
your meter:
•Calibrate your instrument annually to ensure it meets original
performance specifications
• Keep your instrument dry. If it gets wet, wipe dry immediately.
Liquids can degrade electronic circuits
•Whenever practical, keep the instrument away from dust and
dirt that can cause premature wear
•Although your instrument is built to withstand the rigors of daily
use, it can be damaged by severe impacts. Use reasonable
caution when using and storing the meter
Cleaning
Periodically clean your instruments case using a damp cloth. DO NOT
use abrasive, flammable liquids, cleaning solvents, or strong detergents
as they may damage the finish, impair safety, or affect the reliability of
the structural components.
Battery Replacement
This meter has been designed for use with both alkaline and
rechargeable Nickel Metal Hydride (NiMH) batteries. No other types
are recommended. The analyzer is supplied with 4 “AA” size alkaline
batteries. These should be installed into the instrument as shown below
(Fig 1) and indicated on the back of the unit.
CAUTION!
Take great care when installing the batteries to observe correct polarity.
Always check the meter for operation immediately after installing
new batteries.
Using Re-Chargeable Batteries
The battery charger must only be used when NiMH batteries are fitted.
Alkaline batteries are not re-Chargeable. Attempting to recharge alkaline
batteries may result in damage to the product and may create a fire risk.
(Fig 1)
Note: Battery Direction
Battery Compartment
Cover
Back of
Instrument

Since there are many electrical products in use that pre-date this
Directive and may emit electromagnetic radiation in excess of the
standards defined in the Directive there may be occasions where it
would be appropriate to check the analyzer prior to use. The following
procedure should be adopted.
•Go through the normal start up sequence in the location where the
equipment is to be used
•Switch on all localized electrical equipment that might be capable
of causing interference
•Check that all readings are as expected (a level of disturbance in
the readings is acceptable)
•If not, adjust the position of the instrument to minimize
interference or switch off, if possible, the offending equipment for
the duration of the test
At the time of writing this manual (July 200) Kane International Ltd is not
aware of any field based situation where such interference has ever occurred
and this advice is only given to satisfy the requirements of the Directive.
S p e c i f i c a t i o n s
*1Using dry gases at STP
*2Calculated
*C75 only
C50/C75-MAN P. 7
Parameter Resolution Accuracy Range
Temp Measurement
Flue temperature 1.0˚ F/C ±5˚F (2.0˚C) 32 - 1112˚F
±0.3% reading 0 - 600˚C
Inlet temperature 1˚ F/C ±1˚ F/C 32 - 212˚F
±0.3% reading 0 - 100˚C
Temp (Nett)*2 1.0˚ F/C ±5˚F (2˚C) 32 - 1112˚F
±0.3% reading 0 - 600˚C
Gas Measurement
Oxygen 0.1% ±0.2%*1 0 - 21%
*Carbon Monoxide 1 ppm ±10 ppm <100 ppm*1 0 - 1000 ppm
±5% reading
Carbon Dioxide*2 0.1% ±0.3% reading 0 - 30%
Efficiency*2 0.1% ±1.0% reading 0 - 99.9%
Excess Air*2 0.1% ±0.2% 0 - 250%
Pre-programmed fuels Natural gas, Light Oil, Propane, Butane, LPG
Dimensions
Weight 1 kg. / 2.2 lb.
Handset 200mm/7.9” x 45mm/1.8” x 90mm/3.5”
Probe (L) 300mm/7.9” x (Dia) 6mm/0.25” with 200mm/7.8”
long stainless steel shaft, type K thermocouple and
3m/6ft long neoprene hose
Ambient operating +32˚ - 104˚F (0˚ - 40˚C)
10% to 90% RH non-condensing
Battery life 4 “AA” cells
range >8 hours using Alkaline “AA” cells
AC adapter (optional) Input: 110 V AC / 220 V AC nominal
Output: 10 V AC off load
Annual Re-Calibration
While the sensor has an expected life of more than two years in
normal use it is recommended that the analyzer is re-calibrated at least
annually, This is so that long-term drift on the sensor and electronics
can be eliminated. local regulations may require more frequent
re-calibration and users should check with appropriate authorities to
ensure the comply with relevant guidelines.
Tro u b l e s h o o t i n g
The following is a list of problems that may occur on the instrument
through its operating life. If the cause of the fault is not easy to
identify then we advise you to contact UEi Technical Support line at
[phone].
E l e c t r omagnetic Compatibility (EMC)
This product has been tested for compliance with the following
generic standards:
EN 50081-1,EN 50082-1
and is certified to be compliant.
The European Council Directive 89/336/EEC requires that electronic
equipment does not generate electromagnetic disturbances that exceed
defined levels and has an adequate level of immunity to enable it to be
operated as intended.
Fault Symptom Causes
• Oxygen too high Air leaking into probe, tubing, water trap,
• CO2too lowconnectors or internal to instrument
Oxygen cell needs replacing
• Oxygen error “----” Instrument has been stored in a cold environment
• CO sensor error “----” and is not at normal working temperature
Oxygen cell or CO sensor needs replacing
• Display flashes Display “HOLD” is activated
B a t t e rylevel is low
• CO is displayed as COm Units selected for CO are mg/M3
•Analyzer not runningon AC charger not givingcorrect output
mains adapter
•Analyzer does not Particle filer blocked
respond to flue gas Probe or tubing blocked
Pump not working or damaged with contaminant's
•Net temperature or Inlet (or ambient) temperature set wrong during
e f f i c i e n cyc alcula tion automatic cali bra tion
inc orre c t Incorrect efficiency type selected (net vs. gross)
• Flue temperature readings Te m p e rature plug reversed in socket
errat i c Fau lty connection or break in cable or plug
• X-Air, EFF, COa or CO 2 Oxygen reading is above 18%
display (----)
• Meter just continually Turn dial back to “MENU” and press “ENTER” .
bee ps

Limited Warranty
The C50/C75 is warranted to be free from defects in materials and workmanship for a period
of three years (two years on sensors) from the date of purchase. If within the warra n ty period
your instrument should become inoperative from such defects, the unit will be repaired or
replaced at UEi’s option. This warra n ty covers normal use and does not cover damage which
occurs in shipment or failure which results from alteration, tampering, accident, misuse,
abuse, neglect or improper maintenance. Batteries and consequential damage resulting from
failed batteries are not covered by warra n ty.
Any implied warranties, including but not limited to implied warranties of merchantability
and fitness for a particular purpose, are limited to the express warranty. UEi shall not be
liable for loss of use of the instrument or other incidental or consequential damages,
expenses, or economic loss, or for any claim or claims for such damage, expenses or
economic loss. A purchase receipt or other proof of original purchase date will be required
before warra n ty repairs will be rendered. Instruments out of warra n ty will be repaired (when
re pairable) for a service charge. Return the unit postage paid and insured to:
This warranty gives you specific legal rights. You may also have other rights which vary from
state to state.
C50/C75
Combustion Analyzer
Copyright © 2007 UEi C50/C75-MAN 1/07
PLEASE
RECYCLE
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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