VWR TD 121 User manual

H49.0.01.6C-05_VWR
as of version 1.6 Operating Manual TD 121
Recalibratable high precision thermometer
For Pt100 4-wire temperature probes
European Catalogue Number(s):
Euro Plug: 620-1932
Issued: 01.04.2013
WEEE-Reg.-Nr. DE 93889386

H49.0.01.6C-05_VWR Operating Manual TD 121 page 2 of 10
1IN GENERAL...................................................................................................................................................................... 2
1.1 SAFETY INSTRUCTIONS .................................................................................................................................................. 2
1.2 OPERATING AND MAINTENANCE ................................................................................................................................... 3
1.3 CONNECTIONS................................................................................................................................................................ 3
1.4 DISPLAY ELEMENTS....................................................................................................................................................... 3
1.5 PUSHBUTTONS ............................................................................................................................................................... 3
2DEVICE CONFIGURATION............................................................................................................................................ 4
2.1 'UNIT': SELECTION OF TEMPERATURE UNIT °C /°F......................................................................................................... 4
2.2 'RESOLUTION': THE DISPLAY RESOLUTION..................................................................................................................... 4
2.3 'OFFSET': ZERO DISPLACEMENT ..................................................................................................................................... 4
2.4 'SCAL': SCALE CORRECTION........................................................................................................................................... 4
2.5 'POWER.OFF': SELECTION OF POWER-OFF DELAY........................................................................................................... 4
2.6 'OUT': FUNCTION OF THE OUTPUT .................................................................................................................................. 4
2.7 'ADDRESS': SELECTION OF BASE ADDRESS WHEN OUTPUT =SERIAL INTERFACE........................................................... 4
2.8 'DAC.0VOLT': OUTPUT OFFSET WHEN OUTPUT =ANALOGUE OUTPUT ......................................................................... 4
2.9 'DAC.1VOLT': OUTPUT SCALE WHEN OUTPUT =ANALOGUE OUTPUT........................................................................... 4
3SOME BASICS OF PRECISION TEMPERATURE MEASURING............................................................................. 5
4SPECIAL FUNCTIONS..................................................................................................................................................... 6
4.1 DISPLAY RESOLUTION.................................................................................................................................................... 6
4.2 ZERO DISPLACEMENT ('OFFSET').................................................................................................................................... 6
4.3 SCALE CORRECTION ('SCALE') ....................................................................................................................................... 6
4.4 OUTPUT.......................................................................................................................................................................... 6
4.4.1 Analogue Output –Scaling with DAC.0 and DAC.1............................................................................................. 6
5FAULT AND SYSTEM MESSAGES................................................................................................................................ 7
6PROBE PIN ASSIGNMENT ............................................................................................................................................. 7
7CALIBRATION SERVICES ............................................................................................................................................. 7
8SPECIFICATION............................................................................................................................................................... 8
9TECHNICAL SERVICE.................................................................................................................................................... 8
10 WARRANTY................................................................................................................................................................... 9
11 EQUIPMENT DISPOSAL ............................................................................................................................................. 9
1 In General
1.1 Safety Instructions
This device has been designed and tested in accordance to the safety regulations for electronic devices.
However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and special safety advises given
in this manual will be adhered to when using it.
1. Trouble-free operation and reliability of the device can only be guaranteed if it is not subjected to any other climatic conditions than those
stated under “Specification”.
2. Transporting the device from a cold to a warm environment condensation may result in a failure of the function. In such a case make sure
the device temperature has adjusted to the ambient temperature before trying a new start-up.
3. The circuitry has to be designed most carefully if the device should be connected to other devices. Internal connection in third party
devices (e.g. connection GND and earth) may result in not-permissible voltages impairing or destroying the device or another device
connected.
4. Warning: Operating the device with a defective mains power supply (e.g. short circuit from mains voltage to output voltage) may result in
hazardous voltages at the device (e.g. at sensor socket)
5. Whenever there may be a risk whatsoever involved in running it, the device has to be switched off immediately and to be marked
accordingly to avoid re-starting. Operator safety may be a risk if:
there is visible damage to the device
the device is not working as specified
the device has been stored under unsuitable conditions for a longer time
In case of doubt, please return device to manufacturer for repair or maintenance.
6. Warning: Do not use these product as safety or emergency stop device, or in any other application where failure of the product could
result in personal injury or material damage.
Failure to comply with these instructions could result in death or serious injury and material damage.

H49.0.01.6C-05_VWR Operating Manual TD 121 page 3 of 10
1.2 Operating And Maintenance
Battery Operation
The battery has been used up and needs to be replaced, if „bAt“ are shown in lower display.
The device will, however, continue operating correctly for a certain time.
The battery has been completely used up, if ´bAt´ is shown in the upper display.
The battery has to be taken out, when storing device above 50°C.
Hint: We recommend to remove the battery if device is not used for a longer period of time!
Mains Operation
Attention: When using a power supply unit please note that operating voltage has to be 10.5 to 12 V DC. Do
not apply overvoltage!! Simple 12V-power supplies often have excessive no-load voltage. We, therefore,
recommend using regulated voltage power supplies. Trouble-free operation is guaranteed by our power supply
PS 100.
Prior to connecting the plug power supply with the mains supply make sure that the operating voltage stated at
the power supply is identical to the mains voltage.
Treat device and probes carefully. Use only in accordance with above specification. (do not throw, hit against
etc.). Protect plugs and sockets from soiling.
To disconnect sensor plug do not pull at the cable but at the plug.
When connecting the probe the plug will slide in smoothly if plug is entered correctly.
Selection of Output-Mode: The output can be used as serial interface or as analogue output. This choice has
to be done in the configuration menu.
1.3 Connections
1.
Output: Operation as interface: Connect to optically isolated
interface adapter, Operation as analogue output: Connection via
suitable cable.
Attention: The output mode has to be configured (p.r.t 2.7) and
influences battery life!
2.
Probe connection Pt100 4-wire
3.
The mains socket is located at the left side of the instrument
1.4 Display Elements
1 = Main Display:
Currently measured temperature
2 = Auxiliary Display:
Display of min, max or hold values
Special display elements:
3 = Corr-arrow:
indicates that correction factor is activated
4 = Offset-arrow:
indicates that zero point offset (offset) is activated
5 = Min/Max/Hold:
shows if a min., max. or hold value is displayed in
the secondary display
1.5 Pushbuttons
key 1:
On/Off key
key 4:
Set/Menu
press (Menu) for 2 sec.: configuration will activated
keys 2, 5:
min/max when taking measurements:
press shortly: min. or max. measuring value will be displayed
press for 2 sec.: the min. or max. value will be deleted
up/down for configuration:
to enter values or change settings
key 6:
Store/Quit:
- Measurement: Hold current measuring value ('HLD' in display)
- Menu: Acknowledge setting, return to measuring
key 3:
no function

H49.0.01.6C-05_VWR Operating Manual TD 121 page 4 of 10
2 Device Configuration
For configuration of the device press "Menu"-key (key 4) for 2 seconds, the first menu will be shown.
Choose between the individual values that can be set by pressing the "Menu"-key (key 4) again.
The individual values are changed by pressing the keys "" (key 2) or "" (key 5).
Use key "Quit" (key 6) to leave configuration and to store settings.
2.1 'Unit': Selection of Temperature Unit °C /°F
°C:
All temperature values are in degrees Celsius
°F:
All temperature values are in degrees Fahrenheit
2.2 'Resolution': The Display Resolution
0.1°:
Resolution 0.1°C
0.01°:
Resolution 0.01°C
Auto:
Resolution is selected automatically
2.3 'Offset': Zero Displacement
-2.50°C...2.50°C
respectively
-4.50°F...4.50°F
The zero point of the measurement will be displaced by this value to
compensate for deviations in the temperature probe or in the
measuring device
oFF:
Zero displacement inactive (=0.0°)
2.4 'Scal': Scale Correction
-2.000...2.000:
The scale of the measuring will be changed by this factor to
compensate for deviations in the temperature probe or in the
measuring device (factor is in %)
oFF:
Scale correction factor inactive (=0.000)
2.5 'Power.off': Selection of Power-Off Delay
1...120:
Power-off delay in minutes.
Device will be automatically switched off as soon as this time has elapsed if
no key is pressed/no interface communication takes place
oFF:
Power-off function inactive (continuous operation, e.g. mains operation)
2.6 'Out': Function of the Output
OFF:
No output function, lowest power consumption
SEr:
Output is serial interface
dAC:
Output is analogue output 0...1V
2.7 'Address': Selection of Base Address when Output = Serial Interface
01, 11, 21, ..., 91:
Base address of device for interface communication.
2.8 'dAC.0Volt': Output Offset When Output = Analogue Output
-200.0...850.0°C
respectively
-328.0...1562.0°F
Enter desired temperature value at which the analogue output
potential should be 0V
2.9 'dAC.1Volt': Output Scale When Output = Analogue Output
-200.0...850.0°C
respectively
-328.0...1562.0°F
Enter desired temperature value at which the analogue output
potential should be 1V
Hint: The settings will be set to the settings ex works, if keys ‘Set‘ and ‘Store‘ are pressed simultaneously
for more than 2 seconds.

H49.0.01.6C-05_VWR Operating Manual TD 121 page 5 of 10
3 Some Basics Of Precision Temperature Measuring
Probe Precision/Device Precision
The device is very precise (please refer to technical data). To be able to use this high precision, the connected temperature
probe has to be as precise as possible, too. The following precision classes are available as a standard at reasonable
prices (Platinum resistor thermometers according to EN60751):
Class Error ranges
B ± (0,3 + 0,005 • |temperature|)
1/3 B (=1/3 DIN) ± (0,1 + 0,0017 |temperature|)
1/10 B (=1/10 DIN) ± (0,03 + 0,0005 • |temperature|)
A ± (0,15 + 0,002 • |temperature|)
0
1
2
3
4
-200 0200 400 600 800
error [°C]
T [°C]
error of device and probe
B
1/3B
1/10B
A
TD 121
0
0,2
0,4
0,6
0,8
1
1,2
-50 050 100 150
error [°C]
T [°C]
error of device and probe
B
1/3B
1/10B
A
TD 121
Error over measuring range
Error over range –50...150°C
For applications demanding higher precision than given by this classes we suggest to adjust the device to the used probe
or to get a calibration certificate for the device combined with the probe.
Attention: if an adjusted or calibrated probe is replaced, also the adjustment or calibration certificate has to be
renewed to maintain the referring overall precision!
Be careful when buying third party temperature probes: Besides the standard EN60751 there are some other obsolete or
unusual standards on the market.
4-Wire-Measuring
When using resistance thermometers as the Pt100 a quite large measuring error can be caused by inadequate cables and
connections. Using 4wire measuring avoids this kinds of errors mainly caused by unwanted resistances. It is suggested to
use suitable probes and extensions only. (For pin assignment please refer to chapter 6)
Heat loss caused by probe construction:
Especially when measuring temperatures which deviate very much from the ambient temperature, measuring errors often
occur if the heat loss caused by the probe is not considered. When measuring fluids therefore the probe should be
emerged sufficiently deep and be stirred continuously. When measuring gases the probe should also emerge as deep as
possible in the gas to be measured (e.g. when measuring in channel/pipes) and the gas should flow around the probe at
sufficient flow.
Measuring Surface Temperature
If temperature of the surface of an object has to be measured, one should pay attention especially when measuring hot (or
very cold) surfaces, that the ambient air cools (or heats) the surface. Additionally the object will be cooled (or heated) by
the probe or the probe can have a better heat flow to the ambient temperature as to the objects surface. Therefore
specially designed surface probes should be used. The measuring precision depends mainly on he construction of the
probe and of the physics of the surface itself. If choosing a probe try to choose one with low mass and heat flow from
sensor to handle. Thermally conductive paste can increase the precision in some cases.
Allowable temperature Range Of Probes
Pt100 Sensors are defined over a wide temperature range. Depending on probe materials and sort of sensor (e.g. hybrid
sensors, wire wound resistors...) the allowable temperature ranges have to be considered. Exceeding the ranges at least
causes a wrong measuring, it may even damage the probe permanently!
Often it also has to be considered, that the temperature range is just valid for the probe tube, (plastic-) handles can’t stand
the same high temperatures. Therefore the tube length should be selected long enough, that temperature keeps low at the
handle.
Self Heating
The measuring current of the instrument is just 0.3mA. Because of this comparably low current practically now self heating
effect has to be considered, even at air with low movement the self heating is <= 0.01°C.
Cooling by Evaporation
When measuring air temperature the probe has to be dry. Otherwise the cold due to the evaporation causes too low
measurings.

H49.0.01.6C-05_VWR Operating Manual TD 121 page 6 of 10
4 Special Functions
4.1 Display Resolution
Standard setting: 'Auto', i.e. the device automatically switches over to the optimum resolution between .01° and
0.01°.
If temperatures to be measured are near the switching threshold, a fixed resolution may be better, e.g. for easy
recording. In such a case please select the optimum resolution manually.
4.2 Zero Displacement ('Offset')
A zero displacement can be carried out for the measured temperature:
temperature displayed = temperature measured - offset
Standard setting: 'off' = 0.0°, i.e. no zero displacement will be carried out. Together with the scale correction (see
below) this factor is mainly used to compensate for sensor deviations. Unless the factor is set to 'off', the offset
arrow in the display shows an active zero displacement.
4.3 Scale Correction ('Scale')
The scale of the measuring can be influenced by this setting (factor is in %):
displayed temperature[°C] = measured temperature[°C] * (1+Scal/100)
respectively displayed temperature[°F] = (measured temperature [°F]-32°F) * (1+Scal/100) + 32°F
Standard setting: 'off' =0.000, i.e. temperature is nor corrected. Together with the zero displacement (see above)
this factor is mainly used to compensate for sensor deviations.
Unless the factor is set to 'off', the Corr arrow in the display shows an active scale correction.
4.4 Output
By using an electrically isolated interface converter the device can be connected to a PC.
The output can be used as serial interface or as analogue output (0-1V). If none of both is needed, we suggest to
switch the output off, because battery life then is extended.
4.4.1 Analogue Output –Scaling with DAC.0 and DAC.1
With the DAC.0 and DAC.1 values the output can be rapidly scaled to Your efforts.
Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be wrong and battery
life is decreased. Loads above ca 10kOhm are uncritical.
If the display exceeds the value set by DAC.1, then the device will apply 1V to the output
If the display falls below the value set by DAC.0, then the device will apply 0V to the output
In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the output.
plug wiring::
GND
Attention!
The 3rd contact has to be left floating!
Only stereo plugs are allowed!
+Uout

H49.0.01.6C-05_VWR Operating Manual TD 121 page 7 of 10
5 Fault and System Messages
Display
Meaning
Remedy
low battery voltage, device will continue to work for a short
time
replace battery
If mains operation: wrong voltage
replace power supply, if fault continues to
exist: device damaged
low battery voltage
replace battery
If mains operation: wrong voltage
Check/replace power supply, if fault continues
to exist: device damaged
No display
or
weird display
Device does not
react on keypress
low battery voltage
replace battery
If mains operation: wrong voltage
Check/replace power supply, if fault continues
to exist: device damaged
system error
Disconnect battery or power supply, wait
some time, re-connect
device defective
return to manufacturer for repair
----
Sensor error: no sensor connected
Connect sensor to socket
sensor/cable or device defective
return to manufacturer for repair
Err.1
Value exceeding measuring range
Check: Is the value exceeding the measuring
range specified? ->temperature too high!
Wrong probe connected
Check probe
sensor/cable defective
-> replace
Err.2
Value below display range
Check: Is the value below the measuring
range specified? -> temperature too low!
Wrong probe connected
Check probe
sensor/cable defective
-> replace
Err.3
Value exceeding display range
-> set resolution to 0.1° or Auto
Err.4
Value below display range
-> set resolution to 0.1° or Auto
Err.7
system error
return to manufacturer for repair
6 Probe pin assignment
The device is constructed for the connection of a Pt100 4-wire probe. The connection is be carried out as follows:
figure shows view upon probe jack pins
It is also possible to connect an 3- or 2-wire probe to the device. Please observe that in consequence of the cable
resistance a increased measuring fault will occur. The connection of this probes should be carried out as follows:
3-wire connection 2- wire connection
7 Calibration Services
Calibration certificates can be issued by the factory. For this the device has to be sent to the manufacturer. Just the
manufacturer can check the factory settings and correct them if necessary.
Pt100
Pt100
Pt100

H49.0.01.6C-05_VWR Operating Manual TD 121 page 8 of 10
8 Specification
Supported probes Pt100 4-wire (2-wire possible)
Sensor Curve according to EN60751
Probe connection 4pole Mini-DIN socket
Resolution 0.01°C respectively 0.1°C, 0.01°F respectively 0.1°F
Measuring Ranges 0.01°C 0.1°C 0.01°F 0.1°F
–199.99... +199.99°C -200.0... +850.0°C -199.99... +199.99°F -328.0... +1562.0°F
Precision Device without probe ±1Digit (at nominal temperature)
Range 0.01°C/F Range 0.1°C/F
±0.03°C / 0.06°F ±0.1°C / ±0.2°F
Measuring 4-wire measuring with automatic compensation of thermovoltage errors,
measuring current ca. 0.3mA
Temperature drift <=0,002K per 1K
Nominal temperature 25°C
Ambient Temperature -25 ... +50°C (-13 .. 122°F)
rel. humidity 0 ... 95%r.F. (not condensing)
Storage temperature -25 ... +50°C (-13 ... 122°F)
Housing Dimensions: 142 x 71 x 26 mm (L x W x D)
impact-resistant ABS plastic housing, membrane keyboard, transparent panel. Front side
IP65,integrated pop-up clip for table top or suspended use.
Weight approx. 155 g
Output: 3.5mm audio plug, stereo
Selectable as serial interface: via optically isolated interface adapter
or analogue output: 0..1V, freely scaleable (resolution 13bit, accuracy 0.05% at nominal temperature,
cap. load <1nF)
Power Supply 9V-Battery, type IEC 6F22 (included) as well as additional d.c. connector (diameter of internal pin 1.9
mm) for external 10.5-12V direct voltage supply. (suitable power supply: PS 100)
Power Consumption output off ca. 0.90mA
output serial interface: ca. 1.15mA
analogue output: ca. 1.25mA
Display Two 4 ½ digits LCD’s (12.4mm high and 7 mm high) for temperature, min./ max values, hold function,
etc. as well as additional pointing arrows.
Pushbuttons 6 membrane keys for on/off switch, menu operation, min. and max. value memory, hold-function etc.
Min-/Max-Value Memory Both the max. and the min. value will be memorised.
Hold Function Press button to store current value.
Automatic-Off-Function Device will be automatically switched off if no key is pressed/no interface communication takes place
for the time of the power-off delay. The power-off delay can be set to values between 1 and 120 min.; it
can be completely deactivated.
EMC: The device corresponds to the essential protection ratings established in the Regulations of the Council
for the Approximation of Legislation for the member countries regarding electromagnetic compatibility
(2004/108/EG)
EN61326 +A1 +A2 (Appendix B, class B), additional error: < 1% FS.
9 Technical service
Web Resources
Visit the VWR’s website at www.vwr.com for:
•Complete technical service contact information
•Access to VWR’s Online Catalogue, and information about accessories and related products
•Additional product information and special offers
Contact us For information or technical assistance contact your local VWR representative or visit. www.vwr.com.

H49.0.01.6C-05_VWR Operating Manual TD 121 page 9 of 10
10Warranty
VWR International warrants that this product will be free from defects in material and workmanship for a period
of two (2) years from date of purchase. If a defect is present, VWR will, at its option, repair, replace, or refund the
purchase price of this product at no charge to you, provided it is returned during the warranty period. This warranty
does not apply if the product has been damaged by accident, abuse, misuse, or misapplication, or from ordinary
wear and tear.
For your protection, items being returned must be insured against possible damage or loss. This warranty shall be
limited to the replacement of defective products. IT IS EXPRESSLY AGREED THAT THIS WARRANTY WILL BE
IN LIEU OF ALL WARRANTIES OF FITNESS AND IN LIEU OF THE WARRANTY OF MERCHANTABILITY.
11Equipment disposal
This equipment is marked with the crossed out wheeled bin symbol to indicate that this equipment must not be
disposed of with unsorted waste.
Instead it's your responsibility to correctly dispose of your equipment at lifecycle -end by handling it over to an
authorized facility for separate collection and recycling. It's also your responsibility to decontaminate the equipment
in case of biological, chemical and/or radiological contamination, so as to protect from health hazards the persons
involved in the disposal and recycling of the equipment.
For more information about where you can drop off your waste of equipment, please contact your local dealer from
whom you originally purchased this equipment.
By doing so, you will help to conserve natural and environmental resources and you will ensure that your equipment
is recycled in a manner that protects human health.
Thank you

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