
testo 925 is a simple to clean, rugged and easy-
to-use temperature measuring instrument with a
measuring range of
-60 °C to +1000 ° C (-75 °F to +1830 °F).
The different probes enable the instrument to be
used for a variety of different
applications.
Insert probe
Observe ppolarization!
Switch on the instrument.
A short display and seg-
ment test follows.
The measuring instrument
is now operational.
Measured values can be held in display by
pressing the HOLD key.
Should the ambient temperature change (e.g.
place of measurement is altered - indoor/out-
door measurements), the measuring instrument
requires several minutes to adapt.
testo 9925 enables the user to measure in °C or
in °F. A small switch is situated on the left next to
the battery contacts.
Move the
switch as required.
Should
"Bat"
flash in the display, the
battery has a remaining life of approx.
10 hours. Should
"Bat"
be displayed
permanently, the battery should be replaced wit-
hin 1-2 hours. The instrument switches off auto-
matically when the battery voltage is too
low.Remove the old battery and replace with the
new type 9V (IEC 6 F 22) battery (observe pola-
Please rread bbefore
using iinstrument!
Do not measure on live parts!
Observe the measuring range of the
sensor! Overheating will destroy the probe!
Observe permissible storage, transport and
operating temperatures (e.g. protect measuring
instrument from direct sunlight).
Avoid applications in aggressive acids or
solutions.
If the instrument is opened, improperly handled
or if force is applied, no
warranty will be granted!
rization).
testo 925-2
Thermometer
Instruction mmanual
testo
¡C - ¡F
testo
®
925
HOLD
I
0
¡C
¡F
Probe
Display
HOLD
key Probe handle with
guide rail
ON/OFF key
Guide rail for probe
Battery
compartment
Probe input
Safety iinstructions
Description
Typ
+-
When removing the plug, never
pull on the lead!
Instructions oofuuse
I
0
¡C
¡F
HoldBat
¡C
¡F
HoldBat
The instrument switches off
automatically after 14 mins (except
when HOLD is activated).
Auto OOff ffunction
°C//°°Fcconversion
FC
Bat
Technical ddata - iinstrument
Sensor: ......................NiCr-NiAl (plug-in thermo-
couple connection type K)
Measuring rrange: .....-60 to +1000 °C
(-75 to +1830 °F)
Accuracy:..................±1 °C/±1.8 °F ± 0.5 % of mv.
(-40 to +900 °C/
-40 to +1650 °F)
± 2 °C/±3.6 °F, ± 1 % of m.v.
(remaining range)
Resolution: ...............0.1 °C / 1 °C (0.1 °F/1 °F)
automatic conversion of
resolution from 0.1 °C/°F
to 1 °C(1 °F) from +200°C
(+390 °F)
Battery llife: ...............> 100 h (alcali-mang.)
Low battery display
Switches off automatically
(Auto OFF) after 14 min.
Operating ttemp.:........0 to +40 °C
(+32 to +100 °F)
Storage/transport
temp..........................-20 to +70 °C
(-4 to +155 °F)
Housing mmaterial ......ABS
Ordering ddata - iinstrument
Description.........................................Part no.
Temperature mmeasuring iinstrument
testo 9925 TÜV approved..................0560.9252
battery, intruction manual
9VVrrechargeable bbattery..................0515.0025
Charger .............................................0554.0025
for the external charge of rech. batteries
testo 9925 iinstrument ........................24 months
Probes ..............................................12 months
If tthe iinstrument iisoopened, iimproperly
handled ooriiffforce iisaapplied, nnowwarranty wwill bbe
granted!
Warranty
TTeessttooGGmmbbHH&&CCoo..
Postfach 1140, D-79849 Lenzkirch
Telefon (0 76 53) 6 81 - 0, Ttx (7)76 53 10=ELRO,
Telex 7 72 23 34 elro d, Telefax (0 76 53) 68 11 00
Description.........................................Part no.
Measuring range, t99
Flue ggas pprobe TÜV approved ........0602.9492
-60 to +500 °C (t98),(-75 to +930 °F),60 sec.
Flue ggas pprobe TÜV approved........0601.0092
-60 to +500 °C (t98),(-75 to +930 °F), 60 sec.
Thermocouple
for flue gas probe...............................0430.0060
For mmore iinformation gget yyour ffree ttesto 9925
brochure.
Probes
The thermocouple (T) should be positioned in such a way that it is visible the probe tube
windows (F).
The thermocouple must always be located directly in the flue gas flow. It should not be
covered by one of the 3 bars in the probe tube.
Handling iinstructions
Attention!
Avoid contact with the metal pipe during
measurements.