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LR-Cal LTC-FB-0250-60
Temperature calibration micro bath ...+250°C

Brochure
LR-Cal LTC-FB-0250-60 temperature calibration micro bath
LR-Cal
  • Portable
  • Temperature range ambient temperature...+250°C
  • Accuracy ±0.2°C, stability ±0.03°C
  • Bath volume approx. 500 cm³
    (60 mm diameter, 170 mm depth)
  • Option: changeable calibration bath insert
Exchangeable calibration bath insert for LR-Cal LTC-FB-0250-60

Changeable calibration bath insert LR-Cal
LTC-FB-INSERT

Temperature calibration micro bath LR-Cal LTC-FB-0250-60 with support for test item

incl. support for test item and reference

Temperature calibration microbath LR-Cal LTC-FB-0250-60 touchscreen

Simple operation via touchscreen

LR-Cal LTC-FB-0250-60 options + accessories

3 configurable
measuring inputs

Code: LTC-MP-3I
LTC-MP-3I

Option, must be ordered together with the calibrator:
Device version with 3 configurable measuring inputs
2 x for Pt 100 / Pt 1000 / Thermocouples
1 x for analog signal 4-20mA / 0-10V

Power supply
115 VAC

Code: LTC-MP-115V
LTC-MP-115V

Option, must be ordered together with the calibrator:
Device version for power supply
115 VAC 50/60 Hz
(instead of 230 VAC)
NO extra charge

Exchangeable
calibration bath insert

Code: LTC-FB-INSERT
LTC-FB-INSERT

Option:
Calibration bath insert incl. closing cap
For fast change of the silicone oil resp. the calibration fluid (without empying and cleaning the reservoir)

Extension of the
immersion depth

Code: LTC-FB-LONG
LTC-FB-LONG

Accessory:
Extension tube to increase the immersion depth
Total length 255 mm
Usable immersion depth 230 mm


Cooling coil

Code: LTC-FB-COOL
LTC-FB-COOL

Accessory:
Stainless steel cooling coil. The cooling coil shortens the cooling time, and it can also shift the start of the working range of the calibrator downwards (but above 0°C).
Requires fresh water connection

Windows-PC
software Aq2Sp2

Code: LTC-AQ2SP2
LTC-AQ2SP2

Accessory:
Windows-PC software Aq2Sp2
(delivered as download link)

Download Manual (PDF)

Conversion kit to
dry block calibrator

Code: LTC-FB-DB-60-0
LTC-FB-DB-60-0

Accessory:
Dry block conversion kit (aluminum)
Diameter 60 mm
Depth 170 mm
Without holes (for self-drilling)

Conversion kit to
dry block calibrator

Code: LTC-FB-DB-60-9
LTC-FB-DB-60-9

Accessory:
Dry block conversion kit (aluminum)
Diameter 60 mm
Depth 170 mm
With 9 drillings/holes: 4.0+4.0+4.5
+5.5+6.5+6.5+8.5+10.5+12.5 mm

Sturdy case
Aluminum

Code: LTC-FB-DB-KOFFER
LTC-FB-DB-KOFFER

Accessory:
Sturdy case made of aluminum with molded foam inserts
Dimension 450 x 280 x 380 mm
Weight 4.8 kg
Shipping dimensions:
600 x 370 x 500 mm

Tragetasche
mit Schultergurt

Code: LTC-FB-DB-TASCHE
LTC-FB-DB-TASCHE

Spare part:
Carrying bag with shoulder trap
Dimension 410 x 220 x 380 mm
Weight 1.45 kg
Shipping dimensions:
600 x 370 x 500 mm
(1 bag ist included in calibrators delivery)

DAkkS-
certification

Code: DKD-T-KAL-TK-6T
DKD-T-KAL-TK-6T

Option:
DAkkS certificate of calibration

For the measuring chain consisting of display of the calibrator and reference sensor, 6 measuring points

Silikone oil
47V50

Code: LTC-FB-SO-050
LTC-FB-SO-050

Accessory:
500 cm³ calibration fluid
Silikone oil 47V50
for temperature +30...+200°C

Silikone oil
47V100

Code: LTC-FB-SO-100
LTC-FB-SO-100

Spare part:
500 cm³ calibration fluid
Silikone oil 47V100
for temperature +50...+200°C
(1 bottle included in calibrators scope of delivery)

Silikone oil
47V150

Code: LTC-FB-SO-150
LTC-FB-SO-150

Accessory:
500 cm³ calibration fluid
Silikone oil 47V150
for temperature +50...+200°C

Suitable reference sensors (probes) for calibrator version with option LTC-MP-3I (3 configurable measuring inputs):

Information about operating fluids for LR-Cal LTC-FB temperature calibration baths

Calibration liquids for LR-Cal temperature calibration baths

Applications:

  • Thermostatic fluids for micro baths and thermostatic temperature calibration baths

Main Characteristics:

  • Operating range -50...+200°C
  • High stability
  • Good thermal conductivity
  • Nearly odourless
  • Long service live
  • Packaged in bottle or canister
  • Different types for a wide range applications
  • Low toxicity
  • Low viscosity and corrosovity

Our thermostatic fluids are suitable for use in liquid thermostatic calibrators and thermostatic baths for applications from -50°C to +200°C.
The choice of thermostatic fluid is the most important aspect for obtaining the best results with regard to operation and temperature control of calibrators and baths.
These fluids have perfect thermodynamic characteristics to guarantee the best performance in the various fields of application, ensuring safe and reliable operation as well as optimum heat transfer efficiency.
Silicone-based fluids are chemically inert substances that do not affect metals, are resistant to weathering and, when used correctly, the very low formation of cracking and oxidation ensures a long service life.

Most of our thermostatic fluids are available in different containers: 500 cm³ bottles or 9 kg canisters (25 kg on request).

Temperature application ranges of the various operating fluids:

Type of calibration
medium (liquid)		 Usable
range
(1)		 Temperature above which fume hood
should be provided
(2)		 Fume
burning
(3)		 A viscosity of 10 cst exists at a temperature of
(4)		 Freezing temperature
(5)
Glycol 56% + water * -40...+90°C +70°C >110°C  +20°C -43°C
Silicone oil 47V5 -40...+130°C +110°C +136°C  +5°C  -65°C
Silicone oil 47V10 -30...+150°C +120°C +160°C  +20°C  -65°C
Silicone oil 47V20 -20...+200°C ** +130°C +230°C  +60°C  -60°C
Silicone oil 47V50 +30...+250°C ** +140°C +280°C  +160°C  -55°C
Silicone oil 47V100 +50...+200°C ** +170°C >300°C  +200°C  -55°C
Silicone oil 47V150 +50...+200°C ** +190°C >300°C  -/-  -55°C
Note: Note text:
* Mixture of 56% Glycol + 44% water
** In order to avoid gelling, it is recommended not to exceed a temperature of 200°C for a long time; even for fluids with wider operating ranges
(1) Usable range
The “usable range” of a calibration liquid is the temperature range in which it can be used under optimum conditions. The range may be limited by viscosity, flash points, freezing points, boiling points, evaporation rates, tendency to gel (or polymerize), etc.
There is no liquid that covers extremely wide temperature ranges. Therefore, you should ideally use a separate calibration liquid for each temperature range. The recommended range is the one in which the viscosity is not optimal, but still reaches values that allow proper use.
(2) Use of a fume hood
The use of an exhaust hood when using temperature calibration baths prevents users from inhaling vapors from calibration liquids. It is best to use extraction devices near the access opening to the calibration bath. Vapors can otherwise settle on the mucous membranes of the eyes or on the skin, causing discomfort. Silicone oils can form benzene and formaldehyde when they decompose at high temperatures. The table shows the temperature above which an extractor hood should be used.
(3) Flash point
The table shows the temperature value at which the presence of an open flame can ignite vapours combustion.
(4) Viscosity
Viscosity is a measure of the flow resistance of a liquid. Viscosity increases with decreasing temperature. Kinetic viscosity is the ratio of absolute viscosity to density. This is measured in stokes and centistokes (cSt). 1 cSt = 1 stoke divided by 100. The higher the cSt, the more viscous or dense the liquid. Excessively viscous liquids place a strain on the stirring and pumping mechanisms of the calibration bath and do not transfer heat sufficiently. The table shows the temperature value below which the performance of the temperature calibration bath is no longer optimal. The equivalent value of water at 20°C is 1.1 cst.
(5) Freezing point
Silicone oils also change their state below a certain temperature by solidifying. The table shows the value at which the calibration fluid changes its state and solidifies.

Other physical and chemical properties

Specific heat
The specific heat is the amount of heat required to raise or lower the temperature by 1 °C per kg. The specific heat, called CP, is expressed in Kcal/Kg °C. The energy required to heat or cool the calibration liquids depends on the amount of liquid contained in the calibrator in kg and its specific heat. A high specific heat value requires more energy to change the temperature, but offers greater temperature stability. The average CP of silicone fluids is 35 Kcal/Kg °C. The CP of water at 20 °C is equal to 1.

Thermal conductivity
Thermal conductivity is the ability of the liquid to transfer heat from one molecule to another. The better the heat transfer, the faster the liquid heats or cools. Better thermal conductivity improves the temperature uniformity in the reservoir of the calibration bath.

Expansion
All liquids have a coefficient of thermal expansion. This indicates how much the volume of a liquid changes (expands or contracts) when the temperature changes. Liquid expansion has an important impact on the safety, cleanliness and maintenance of temperature calibration baths. If calibrators are filled with too much liquid at a low temperature and then heated without regard to the increase in volume, they can overflow.

If too little liquid is filled in the reservoir, below the level of the heating elements, the temperature rise of the non-immersed part of the heating elements could ignite the liquid.

Gelation (polymerization)
The gelling temperature is the temperature at which silicone fluids oxidize, gel and turn into a viscous slurry. The main cause of this phenomenon is oxidation. Although silicone fluids can be used safely up to their flash point, the susceptibility to polymerization increases when used above their oxidation point. To prevent polymerization, it is advisable to keep the operating time above the oxidation point of the silicone oil used as short as possible in order to keep contaminants (salts, other oils and oxidizing agents) away. The calibration fluid must be replaced if it becomes dark, viscous or temperature unstable. It is important to limit the application time at high temperatures to prevent the oil from degrading and to extend its service life.