LR-Cal BK 40-M

Stationary
Temperature range -40°C...+125°C
Accuracy ±0.2°C, stability ±0.05°C
Calibration bath made of stainless steel, useful diameter 85 mm, depth 340 mm
Option: Version -2I with 2 measuring inputs for Pt 100 or thermocouples
Option: Vertical overflow system for even higher temperature uniformity

control panel of the LR-Cal BK 40-M calibration bath

LR-Cal BK 40-M
control panel

optional vertical
overflow system

Scheme of the
optional vertical
overflow system

Description

LR-Cal BK 40-M description

The portable temperature calibration bath LR-Cal BK 40-M serves as a temperature source and reference instrument in one, for testing and calibrating temperature measuring instruments of all kinds. It is particularly suitable for laboratory and glass thermometers.

It features a particularly robust design, with stainless steel liquid container, and modern microprocessor control.

The large usable volume of approx. 10 liters ensures high temperature stability over the entire range, thus simultaneous calibration of several test items is possible without any problems. The vessel is filled with a suitable calibration medium, which is constantly kept in a homogeneous state by means of a vertical stirrer. The stirrer is driven by an 80W electric motor. The equipment is also equipped with a safety temperature limiter, an overflow and a valve for emptying the heating tank.

Optionally, the LR-Cal BK 40-M temperature calibration bath can be equipped with a vertical overflow system to further improve temperature stability and uniformity.

The thermostatic temperature calibration bath LR-Cal BK 40-M is used

Testing and calibration of temperature sensors
Testing and calibration of glass thermometers
Testing and calibration of measuring temperature chains
Testing and adjustment of thermostats and thermostatic valves

Variants/designs

LR-Cal BK 40-M Variants/designs

Code	Variant / design
BK40-M	Normal standard version
BK40-M-TR	Variant with vertical overflow system for further improvement of temperature uniformity
BK40-M-2I	Version -2I with two measuring inputs for Pt 100 / thermocouples *)
BK40-M-TR-2I	Version with vertical overflow system and with two measuring inputs for Pt 100 / thermocouples *)

*) Accuracy (maximum deviation) of the two measuring inputs for device version "-2I":
Pt 100 or Pt 1000	at -40°C:	±0.09°C	at 0°C:	±0.08°C	at +150°C:	±0.11°C	at +300°C:	±0,14°C
Thermocouple type B	at +950°C:	±0.97°C	at +1,050°C:	±1.03°C	at +1,200°C:	±1.12°C
Thermocouple type E	at -40°C:	±0.42°C	at 0°C:	±0.40°C	at +350°C:	±0.61°C
Thermocouple type J	at +200°C:	±0.52°C	at +450°C:	±0.67°C	at +700°C:	±0.82°C
Thermocouples types K, N, R and S	at +400°C:	±0.64°C	at +700°C:	±0.82°C	at +1,000°C:	±1.00°C
Thermocouple type T	at -40°C:	±0.42°C	at 0°C:	±0.40°C	at +350°C:	±0.61°C

Specification

LR-Cal BK 40-M specification

Temperature range	-40°C...+125°C
Stability	±0.05°C
Uniformity	0.02°C radial and axial
Stability indication	audiovisual
Accuracy	±0.2°C at +120°C
Display resolution	0.01°C
Temperature indication	°C / °F switchable
Interface	RS232
Thermostat test circuit	12V
Ramp function	yes
Switch test	yes
Bath containter	Stainless steel, usable diamter 85 mm, depth 340 mm
Versorgung	230 VAC ±10% (optional, on request: 115 VAC)
Leistungsaufnahme	2500 W
Gewicht	approx. 60 kg (Shipping weight approx. 74 kg)
Abmessung	450 x 450 x 925 / 1300 mm

Scope of standard supply

LR-Cal BK 40-M scope of standard supply

Stationary temperature calibration bath LR-Cal BK 40-M
Tank cover with 5 holes, 16 mm diameter, with guide tube
Spare fuses
Cable for power supply
Connection cables for thermostat tests
Holding device for test specimens
only for -2I versions: Connection cable red/black, screw terminals red/black, for both measuring inputs
Factory certificate of calibration
Operating manual EN

Calibration liquids

LR-Cal BK 40-M calibration liquids

Calibration liquid
Glycol

Code: GLYCOL

Can with 10 kg
Ethylenic glycol 56%
Application range -40...+80°C
Smoke flash point at 110°C
A viscosity of 10 cst
exists at +20°C
Freezing temperature -43°C

For units with vertical overflow system to be used for temperatures -40...+1°C.

For devices without vertical overflow system recommended for range -40...+80°C
Stability ±0.05°C (at 20°C)
Uniformity ±0.05°C
Cooling gradient 0.4°C/min

Calibration liquid
silicone oil 200C5

Code: 200C5

Can with 9 kg
Silicone oil 200C5
Application range -40...+130°C
Smoke flash point at 110°C
A viscosity of 10 cst
exists at +5°C
Freezing temperature -65°C

To be used for devices with vertical overflow system for temperatures 0...+125°C.

Calibration liquid
silicone oil 47V10

Code: 47V10

Can with 9 kg
Silicone oil 47V10
Application range -30...+150°C
Smoke flash point at 150°C
A viscosity of 10 cst
exists at +20°C
Freezing temperature -65°C

Calibration liquid
silicone oil 47V20

Code: 47V20

Can with 9 kg
Silicone oil 47V20
Application range -20...+200°C
Smoke flash point at 230°C
A viscosity of 10 cst
exists at +60°C
Freezing temperature -60°C

Recommended for devices without vertical overflow system for range -20...+125°C
Stability ±0.05°C (at 20°C)
Uniformity ±0.1°C
Cooling gradient 1°C/min

Information about operating fluids for temperature calibration baths

Calibration liquids for LR-Cal temperature calibration baths

Basically, temperature calibration baths can be filled with three types of calibration media:

Media that are in a liquid state at ambient temperature, e.g. oils, alcohol and water/alcohol mixtures.
Two-phase media which become liquid at the intended temperature application range of the calibrator. These are usually mixtures of potassium and sodium salts which are powdery at ambient temperature and become liquid at temperatures between 150°C and 500°C. They are used exclusively in calibration baths specially suited for this purpose.
Other solid substances which under certain circumstances or temperatures reach a state similar to a liquid medium, e.g. sand or aluminum powder with extremely fine grain/granularity.

DRUCK & TEMPERATUR Leitenberger GmbH does not use two-phase media for the calibration bath inserts, although their temperature range is very high.
This is because such media can be very dangerous for the user and even cause explosions.

DRUCK & TEMPERATUR Leitenberger GmbH also does not manufacture calibration bath inserts which are suitable for use with solid substances, e.g. aluminum powder.
This is because it is not possible to prevent 100% that corresponding powder particles get into the environment during operation of the calibrator. These media are not environmentally compatible.

The calibration media sold by DRUCK & TEMPERATUR Leitenberger GmbH for calibration bath inserts are therefore exclusively silicone oils (or glycol-water mixture.

Temperature application ranges of the various operating fluids:

Type of calibration medium (liquid)	Possible field of application (1)	Temperature above which an extraction system should be provided (2)	Smoke flash point (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 200C5	-40...+130°C	+110°C	+136°C	+5°C	-65°C
silicone oil 47V10	-30...+150°C	+120°C	+150°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...+270°C	+170°C	>300°C	+200°C	-55°C
silicone oil 47V710	+80...+280°C	+200°C	>300°C	+150°C	-22°C

(1)	The "possible range of use" describes the theoretical usability of the medium. However, the viscosity may be unfavorable for practical use as a calibration medium, especially in the lower part of the application range.
(2)	At temperatures higher than those specified, the calibrator should be placed under an exhaust system, as a not inconsiderable amount of smoke may be generated.
(3)	Above the specified temperatures, the smoke ignites (CAUTION: open fire!).
(4)	Below the specified temperatures, the viscosity of the medium is particularly unfavorable. The viscosity value decreases as the temperature increases. For information: the viscosity of water at 23°C is 1 cst.
(5)	Below the specified temperature, the respective medium becomes solid and thus completely unsuitable.

The calibration media are subject to wear (degeneration), which is greater the more often and longer they have been exposed to high temperatures. Therefore, avoid unnecessarily high temperatures over an unnecessarily long period of time.

LR-Cal BK 40-MStationary temperature calibration bath-40...+125°C