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On the job...
Humidity calibration
The humidity sensors in the testostor 171 series (Type
171-2/1722/171-3 with integrated Testo humidity sensor
or Type 171-1/171-6 with humidity/temperature probe
which can be connected separately) must be checked in
accordance with application conditions and recalibrated
if there are large deviations.
The recommended control cycles range from yearly
intervals when the loggers are used for room climate
measurements to monthly controls under extreme
conditions when harmful gases or dusty air are present.
Find out which protective cage is suitable for your
sensor, in accordance with your application.
To control and calibrate the humidity sensors, a control
and adjustment set (Item no. 0554.0660) is available as
an accessory. The set consists of two small containers
with saturated salt solutions which permanently produce
humidity values of 11.3 and 75.3 %RH.
Remove the protective or the sintered cap and ensure
that the temperature and humidity sensor look to be in
order.
In the case of Type 171-2/1722/171-3 (with integrated
sensor) the humidity containers are screwed on directly.
An adapter for the separate humidity probe is included
with the calibration set which you can attach to the 12
mm probe. Screw the probe together with the adapter
into the container (the standard protective cap should
remain on the probe, the sintered cap should be
removed).
Screw on the 11.3 %RH container and wait until the
required thermal and humidity balance is reached
(recommendation: 30 min, 60 min is preferable). A stable
temperature b20 to +25 °C is important in this
case.
On the job...
Error messages
Error message
• The last command was
not processed
• Incorrect date/time
received
• Starting time in the
past
• Error in the data memory
• Error in EEPROM
• Error in EPROM
• Your probe configuration
is not set up for a
calibration.
• Instrument type and
programming data
do not correspond.
Cause
Communication fault
Technical problem
The starting time which is to
be transmitted is behind the
current time in the logger.
Technical problem-
Contact Service Dept.
An external humidity probe is
not configured on channel 1.
A program file not suitable
for the connected type was
opened.
Remedy
Check connection cable and
try again.
Please contact our Service
Department.
Reset the clock in the logger
(
→
O
PTIONS
,
Page 28).
Please contact our Service
Department.
Change the configuration
and program the logger.
Open a program file
corresponding to the logger
or connect the correct logger
type.
