11 General ��������������������������������������������������������������������������������������������������������������4
1�1 Information about the manual ���������������������������������������������������������������������4
1�2 Explanation of the symbols �������������������������������������������������������������������������4
1�3 Liability and Warranty ����������������������������������������������������������������������������������4
1�4 Copyright �����������������������������������������������������������������������������������������������������5
13 Shipping, packaging and disposal ���������������������������������������������������������������������7
3�1 Inspection after shipping �����������������������������������������������������������������������������7
3�2 Packging �����������������������������������������������������������������������������������������������������7
3�3 Disposal oft he old devices �������������������������������������������������������������������������7
14 Theory of Non-Contact Temperature Measurements�����������������������������������������8
4�1 Advantages of Non-Contact Temperature Mesasurement ��������������������������8
4�2 Measurements at Black Bodies (Cavity Radiators) �������������������������������������8
4�3 Measurements of Real Radiators ���������������������������������������������������������������9
4�4 Measurements errors ����������������������������������������������������������������������������������9
15 Ways to determine emissivity ��������������������������������������������������������������������������10
16 Function �����������������������������������������������������������������������������������������������������������10
17 Installation ��������������������������������������������������������������������������������������������������������11
10 Shielding and Grounding ���������������������������������������������������������������������������������16
11 Operating control and display ��������������������������������������������������������������������������17
11�1 Processing of measuring signals�������������������������������������������������������������18
11�2 Analogue output ��������������������������������������������������������������������������������������18
11�3 Switching threshold OUT 1 ����������������������������������������������������������������������19
11�4 Output signal �������������������������������������������������������������������������������������������19
11�5 Switch on delay ���������������������������������������������������������������������������������������19
11�6 Switch off delay ���������������������������������������������������������������������������������������19
Operating instructions CellaTemp PX 21 / 31 / 36
11�7 Hysteresis function ����������������������������������������������������������������������������������20
11�8 Window function ������������������������������������������������������������������������������������21
11�9 Switching output OUT 2 ������������������������������������������������������������������������22
11�10 Damping function ����������������������������������������������������������������������������������22
11�11 Peak hold function ���������������������������������������������������������������������������������23
11�12 ATD function ������������������������������������������������������������������������������������������23
11�13 IO-Link ���������������������������������������������������������������������������������������������������27
12 Menu ����������������������������������������������������������������������������������������������������������������27
12�1 Analogouge output Ao �����������������������������������������������������������������������������27
12�2 Switching output OUT 1 ��������������������������������������������������������������������������28
12�3 Switching output OUT 2 ��������������������������������������������������������������������������29
12�4 Spectral channel �������������������������������������������������������������������������������������30
12�5 Advanced Features ���������������������������������������������������������������������������������31
13 Menu explanation ��������������������������������������������������������������������������������������������32
13�1 Analogue output ��������������������������������������������������������������������������������������32
13�2 OUT 1 (dI) ������������������������������������������������������������������������������������������32
13�3 OUT 2 (d2) �������������������������������������������������������������������������������������������33
13�4 Spectral channel (S) �������������������������������������������������������������������������������33
13�5 Advanced Features (EF) �������������������������������������������������������������������������36
14 Parameterizing �������������������������������������������������������������������������������������������������36
14�1 Setting parameters – general information �����������������������������������������������36
15 Error indications �����������������������������������������������������������������������������������������������38
16 Service functions ���������������������������������������������������������������������������������������������38
16�1 Reset all parameters to factory settings ��������������������������������������������������38
16�2 Simulate a desired temperature ��������������������������������������������������������������39
17 Maintenace ������������������������������������������������������������������������������������������������������39
17�1 Cleaning the pyrometer lens �������������������������������������������������������������������39
17�2 Replacing the protective screen ��������������������������������������������������������������40
18 Models �������������������������������������������������������������������������������������������������������������40
19 Field of view �����������������������������������������������������������������������������������������������������41
20 General technical data �������������������������������������������������������������������������������������42
21 Device-specific technical data �������������������������������������������������������������������������44
23 Accessories �����������������������������������������������������������������������������������������������������47
24 Default settings ������������������������������������������������������������������������������������������������47
25 Copyright ���������������������������������������������������������������������������������������������������������47
EN
Operating instructions CellaTemp PX 21 / 31 / 36
1 General
1.1 Information about the manual
The Operating Manual shall enable the user to properly install the pyrometer
and the required accessories� Before starting installation, be sure to read and
understand this entire manual, in particular the chapter on safety! The instruc
tions contained in this manual, especially those concerning safety, as well as site
specific regulations governing UV radiation must be complied with at all times� It
is imperative to comply with the safety instructions and the accident protection
regulations valid for the area of application!
1.2 Explanation of the symbols
Important safety-related references in this manual are marked with a symbol�
ATTENTION
This symbol points out guidelines� If you do not observe them, the device might
be damaged, malfunctioning or even fail to operate�
CAUTION
This symbol points out hints and information which should be heeded for
efficient and trouble-free operation�
►
Action
This symbol instructs the operator to take action�
>
Reaction, result
This symbol indicates the result of the action taken�
1.3 Liability and Warranty
All information compiled in this manual is in accordance with applicable regula
tions� The statements made are based on state-of-the-art technology and reflect
our extensive knowledge and many years of experience�
Always carefully read this Operating Manual before beginning any work
on or with the instrument, especially prior to installation and initial setup!
The Manufacturer shall not be held liable for any damages or malfunctions
arising from a disregard of the warnings and instructions contained herein�
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Operating instructions CellaTemp PX 21 / 31 / 36
1.4 Copyright
This Operating Manual should be treated as confidential� It is solely intended for
the use by persons involved with the instrument� This manual may not be made
available to a third party without prior Manufacturer’s consent� Please contact the
Manufacturer if the need should arise�
2 Safety
This chapter outlines all important safety aspects to be considered for optimum
employee protection and to ensure safe and reliable operations�
2.1 Intended use
The pyrometer is solely intended for use as described in this manual� Operational
safety can only be ensured when the instrument is used for its intended purpose�
The use of the pyrometer for any other purpose beyond what is specified
in this manual is prohibited� Using the instrument in any other manner will
be considered as improper� The Manufacturer/Authorised Agent shall not
be held liable for any damages or loss resulting from such unintended or
improper use; in this case the risk is solely borne by the user�
2.2 User´s responsibility
The pyrometer may only be used when it is in perfect working condition�
2.3 Safety requirements
The instrument operates at low voltage (18 – 34 V DC)� The power supply unit
must conform to directiv EN 50178, SELV, PELV entsprechen�
EN
5
Operating instructions CellaTemp PX 21 / 31 / 36
2.4 Laser Radiation Hazard
Laser radiation can be harmful to eyey!
The CellaTemp PX with laser operates with a class 2 red light laser� Direct prolonged viewing of a laser beam can injure the retina� Therefore, the following safety precautions must be strictly observed, otherwise the laser may not be operated!
• Only use the laser to align and focus the pyrometer� Deactivate the laser
immediatley afterwardsAlternatively, the laser will automatically switch off after
2 minutes�
• Never look directly into the laser beam path
• Do not leave the instrument unattended when the laser is activated�
• Do not point th elaser beam at any person
• During pyrometer installation and aligment, make sure to avoid the possibility of
laser reflections caused by reflective surfaces�
• All currently valid laser safety standards must be observed�
Laser power
The laser operates at a wavelength of 630 - 680 nm (visible red light)� The emitted
power of the laser beam at the lens opening is max� 1�0 mW� Under normal operat
ing conditions, the emitted radiation does not present a danger to human skin� This
laser product is classified according to laser class 2, EN60825-1, IEC60825-1�
Laser Warning Label
The black and yellow laser warning label is affixed next to nameplate of the instru
ment� An arrow indicates the laser emission path (lens opening)�
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6
Operating instructions CellaTemp PX 21 / 31 / 36
If the pyrometer is installed within, a machine or equipment in such a
way that the instrument’s warning label is visibly blocked, additional laser
warning labels (not included in scope of delivery) must be affixed to the
equipment or accessory in immediate vicinity to the laser beam emission
path opening�
3 Shipping, packaging and disposal
3.1 Inspection after shipping
Unpack and inspect the entire shipment immediately upon receipt to make sure
it is complete and undamaged� If the container/package shows visible signs of
damage, please refuse the shipment� If this is not possible, accept the shipment on
the condition that the freight carrier’s delivery record is noted with the extent of the
damage in order to file a claim� Should you discover a concealed loss or damage,
report it to the shipper or freight carrier immediately� If the period for filing claims
has expired, you will no longer be able to make any claims for compensation of
damage or loss�
3.2 Packging
The packages used are made of carefully selected, environmentally compatible
materials and are thus recyclable� Please ensure that they are disposed of in an
ecologically sound manner�
3.3 Disposal oft he old devices
Old electrical and electronic devices frequently still contain
valuable materials� These devices can be returned for disposal to
the manufacturer or they must be disposed properly by the user�
For the improper disposal of the device by the user, the company
KELLER HCW is not responsible�
EN
7
Operating instructions CellaTemp PX 21 / 31 / 36
4 Theory of Non-Contact Temperature Measurements
All materials radiate thermal energy in all states of aggregation above absolute
zero� This radiation is mainly caused by atomic or molecular oscillations�
This temperature radiation is only a limited sector within the total electromagnetic
radiation spectrum� It extends from the visible range starting at wavelengths of ap
prox. 0.5 μm to the infrared range with wavelenghs of more than 40 μm. Radiation
pyrometers detect infrared radiation for non-contact temperature measurement�
4.1 Advantages of Non-Contact Temperature Mesasurement
• Non-contact temperature detection means cost-effective temperature
measurement because this technique only requires a single in-vestment in an
instrument without any follow-up costs for consumables such as thermocou
ples
• This method enables temperature detection of moving objects - quick temper
ature measurements within milliseconds - for example at automatic welding
processes
• Small objects with medium and high temperatures can also be easily and
accurately measured
• When measuring materials with low specific heat, a non-contact method does
not induce heat loss which would distort the temperature reading (as is the
case with contact temperature probes)� Non-contact temperature detection
is ideal with corrosive molten materials for which the use of thermocouples is
hardly feasible
• Last but not least it is also possible to measure the temperature of volt
age-carrying objects�
4.2 Measurements at Black Bodies (Cavity Radiators)
A black body or a black radiator is used to calibrate radiation pyrometers� This
black body is designed in a way that its radiation does not depend on material
characteristics, but only on its temperature� A black body emits at any wavelength
the maximum energy possible for the specific temperature� Real bodies do not
have this ability� In other words, a black body completely absorbs the radiation
without reflection or transmission losses. The spectral emissivity coefficient ε(λ) of
a black body is equal to 1 or 100 %�
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Operating instructions CellaTemp PX 21 / 31 / 36
The emissivity coefficient indicates the ratio of radiation of a real body (target) to
the radiation of an ideal black body (target) to the radiation of an ideal black body�
ε(λ): Emissivity coefficient of the object’s surface (targeted spot) at wavelengh λ
M: Emissivity coefficient of the object’s surface (targeted spot) at wavelength
MS: radiant energy emitted by a black body (perfect radiator)
Most burning, annealing and hardening furnaces emit a radiation of nearly ‚1‘
which corresponds to the conditions of a black body if the aperture through which
the measurement is made is relatively small�
4.3 Measurements of Real Radiators
Real radiation sources are characterized by the relation of the emitted radiation to
the radiation of a black body with the same temperature� Measurements outside a
furnace - which applies to all other self-contained targets - always show a reading
which is too low� Considerable errors can occur at targets with reflecting, polished
or bright surfaces, e�g� molten steel and metal without oxide layer and ceramic
materials� Exact results can only be obtained when the emissivity coefficient is
correctly adjusted on the pyrometer� The spectral emissivity coefficient of a body
does not represent an exact material constant, but is also largely dependent on the
surface properties (→ Ways to determine emissivity).
4.4 Measurements errors
The cause of measurement errors in the use of pyrometers is often an incorrectly
determined or wrong emissivity� Another source of error is the reflected „back
ground radiation“� If the measurement object has a low emissivity and there are
hotter objects in the surrounding area, measurement results can be affected�
These objects then have to be shaded� This effect is particularly to be observed in
the measurement of a colder object within a hot oven�
EN
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9
Operating instructions CellaTemp PX 21 / 31 / 36
5 Ways to determine emissivity
Technical literature or operating manuals often contain data on the emissivity of
various materials� This information should be used with caution, however� It is
important to know for which temperature and which wavelength the emissivity
value is applicable� Furthermore, the stated emissivity values were obtained under
ideal conditions� In actual practice, the total emissivity of the target object will vary,
depending on the amount of extraneous radiation transmitted through the object
from the background or reflected onto the object from the foreground� The emissiv
ity can be determined using one of the following methods:
Contact measurements
Measure the temperature with a contact thermocouple and measure the surface
temperature with a pyrometer� Adjust the emissivity coefficient on the pyrometer
until both devices show the same temperature� When measuring with the thermo
couple, make sure to have good thermal contact and low heat dissipation�
Using a reference emissivity coefficient
Apply matte black colour to a part of the surface to be measured� This part has an
emissivity of 94 %� At first, measure the temperature of the coloured part� Then
make a comparative measurement right next to the coloured part and adjust the
emissivity on the pyrometer until it displays the previous measurement reading
again�
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6 Function
The pyrometer detects the radiated infrared radiation of objects without contact
and converts them into an electrical switching signal and an analogue output
signal�
10
Operating instructions CellaTemp PX 21 / 31 / 36
7 Installation
7.1 Assembly basic unit
The basic unit should be mounted where it is not unnecessarily exposed smoke,
heat or vapour�
ATTENTION
At ambient temperature > 65 °C, the basic unit must be cooled or protected
against radiation by shielding plate�
7.2 Assembly fibre optic cable
One end of the optical fibre has a nameplate showing the serial number of the
corresponding basic pyrometer� This is the end which must be screwed onto the
pyrometer� For proper connection, the arrow on the name plate of the fibre optic
cable and the arrow on the pyrometer should point toward each other�
The serial number of the measuring head should also correspond to the pyrometer�
EN
ATTENTION
The fibre optic cable must not be exposed to tensile load and must not be
twisted� The minimum bending radius is 125 mm�
11
Operating instructions CellaTemp PX 21 / 31 / 36
7.3 Aiming the pyrometer
Point the measuring head at the object to be measured� If possible, the pyrometer
should be installed at an angle of 90° to the object to be measured� The angle
should not be less than 45° from the vertical� The spot must be completely filled by
the measured object�
1Best - Target larger than the spot size
2Good - Target equal to spot size
3Incorrect - Target smaller than spot size
Contamination of lens can lead to measure measurement errors� Therefore, always make sure that the lens is clean� The pyrometer field of view
must remain unobstructed� Any interferences from objects must be avoid�
7.4 Focussing
The pyrometers have a laser that can be activated to align the sensing head to
the target spot� To activate the laser, press the MODE button in the real panel for
2 seconds�
For focal adjustment loosen the shown socket screw (hexagon socket screw DIN
916) with a wrench (DIN 911) and shift the internal body of the tube towards the
lens tube� Due to the O-ring sealing between the internal body of the tube and the
lens tube the focal adjustment must be carried out very slowly so that the air pres
sure in the space between lens and internal body of the tube can be equalised�
Focus the sensing head until the spot light is shown as a sharp round laser spot in
the target area�
123
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Operating instructions CellaTemp PX 21 / 31 / 36
EN
The activated laser pilot light can influence the measured temperature�
This influence will vary, depending on the instrument model and the
temperature�
To protect the laser against overload, an over temperature is provided� At tempera
tures above 60 °C, the laser switches of an can no longer be activated� To check,
whether the laser is activated, the parameter LED lights up�
In normal operation, the laser is switch off� After activation, the laser switch of
again after 2 – 15 minutes� The operator must be familiar with the pyrometer and
above safety guidelines�
Information on the laser output can be found in chapter 2�4 Laser power
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13
Operating instructions CellaTemp PX 21 / 31 / 36
24 V DC
8 Electrical connection
ATTENTION
• The pyrometer may only be installed by a skilled, qualified electrician� Do not
connect the instrument while the voltage supply source is turned on� Please
observe international safety regulations at all times�
• The pyrometer is supplied with low voltage 24V DC� The power supply unit
must conform to directive EN50178, SELV, PELV�
► Switch to neutral and verify absence of voltage
► Connect the instrument according to the following schematic:
1
2
1
5
3
4
4
5
2
3
shielded
Out 2
0/4 - 20 mA
L+
C/Q
L-
Pin 1BN (brown)L+ (Power supply 24V DC)
Pin 4BK (black)
Pin 5GY (grey)
Open Collector switching output; Imax = 150 mA or
IO-Link OUT 1
Open Collector switching output; Imax = 150 mA
OUT2
Pin 2 WH (white)Analogue output; 0/4 - 20mA
Pin 3BU (blue)L- (GND)
The pyrometer must be protected against high voltage and strong electromagnetic fields� Use a shielded cable, connecting it via connector casing
to the device housing�
Use a flyback diode when switching inductive loads�
14
Operating instructions CellaTemp PX 21 / 31 / 36
9 Setup
For non-contact temperature measurement, the pyrometer uses the intensity of the
infrared radiation� In order to obtain accurate measurement results, the respective
emissivity of the measurement object must be set on the pyrometer (→ emissivity
determination)�
An incorrectly set emissivity leads to measurement errors during temperature
measurement� After the supply voltage has been switched on for the first time, the
emissivity must first be set. The emissivity is set as follows:
► Press [˄ or ˅]
> > The value of the selected emissivity is displayed, for example [100.0]
► Press [˄ or ˅] until the desired emissivity will show
► Press [Enter] or wait for 3 seconds
> The current temperature value is displayed and the new emissivity coefficient
is stored�
To compensate for environmental influences, it may be useful to have an
emissivity of > 100 %� A setting of 110 % is possible�
ATTENTION
An incorrectly set emissivity coefficient leads to wrong temperature readings�
EN
15
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