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2. Product description
2.3 Readings and Area versions
Reading
Display
Flue gas temperature (FT)
T1
Ambient air temperature (AT)
T2
O
Oxygen
2
CO
Carbon dioxide
2
1
CO
Carbon monoxide
1
u CO
Carbon monoxide, undiluted
1
Rat.
Ratio
1
Rat.
Poison index (GI)
qR
Flue gas loss ref. to H
o
2
qR*
Flue gas loss ref. to H
u
qA
Flue gas loss
qA*
Flue gas loss referred to
AT = 25 °C
Efficiency referred to H
EFF GROSS
o
Efficiency referred to H
EFF NET
u
Efficiency
EFF
η η
Efficiency
λ λ
Lambda
Excess Air (EXA)
EA
1
Only in testo 305-1
2
Only with GAS fuel
Area version
Specific readings
I
Rat., EFF GROSS, EFF NET, EA
II
EFF, EA
η η
λ λ
III
qA, qA*,
,
η η
λ λ
IV
Rat. (GI), qR, qR*,
,
24
Unit
Area version
I
II
III
°C or °F
x
x
x
°C or °F
x
x
x
%
x
x
x
%
x
x
x
3
ppm or mg/m
x
x
x
ppm
x
x
x
-
x
-
-
-
-
-
-
%
-
-
-
%
-
-
-
%
-
-
x
%
-
-
x
%
x
-
-
%
x
-
-
%
-
x
-
%
-
-
x
-
-
-
x
%
x
x
-
for example
GB
USA
D, F, E, I, J, B, A, CH, TR, S, GUS, RO, SLO, CZ, H, DK
NL
3.1 Adjusting
IV
x
x
x
x
x
x
-
x
x
x
-
-
-
-
-
x
x
-
If you have input incorrectly by mistake: Please switch off the
instrument and enter your settings again
Place the batteries/rechargeable batteries in the battery
compartment (See 4.1 Changing batteries/rechargeable
batteries, P. 28)
When first switching on the instrument
1 Switch on instrument using the On/Off switch on the left side
of the instrument
.
- The instrument runs a display test. All segments light up for
approx. 5 s. The version number of the instrument is then
displayed for approx. 3 s.
- CALC and the preset area version (III) flash
2 Using
or
, select the required area version
(I, II, III or IV, See 2.2 Readings and Area versions,
S. 24) and confirm your choice with
.
3 Using
select the required temperature unit (°C or °F)
Only in testo 305-1:
, select the required CO unit (ppm or mg/m
Using
conversion formula: O
reference fixed at 3%).
2
4 Confirm your selection with
.
- The instrument starts a zeroing phase (pump starts,
flashes and the required time is indicated
5 Switch off instrument using the On/Off switch on the left side
of the instrument
. It is not required to wait on the zeroing
phase to finish!
Changing the settings
1 Switch on the instrument using the On/Off switch on the left
side of the instrument
and press
during the segment test.
- CALC and the set area version (I, II, III or IV) flash
Carry out steps 2 to 5 as described above.
3. Operation
.
3
,
.
and
simultaneously
.
25
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