TEL-10400SYS Critical Point System

The Critical Point System includes everything needed to perform high-precision measurements on the compression and liquefacation of a gas. Students can plot P-V and P-V-T diagrams, verify the ideal gas law, and investigate the behavior of gasses through phase changes. The TEL-10400SYS Critical Point System includes the TEL-10400 Critical Point Aparatus, the TEL-14400 Immersion/Circulation Thermostat, the TEL-11853 Digital Quick Response Pocket Thermometer, the TEL-11854 K-Type NiCr-Ni Immersion Sensor, -65°C – 550°C, and a supply of Sulfur Hexafluoride.

TEL-10400SYS Critical Point System

$7888

TEL-10400 Critical Point Apparatus

A high-precision apparatus for studying the compression and liquefaction of a gas, determining the critical point and recording isotherms in P-V (Clapeyron) diagrams. The test gas is sulfur hexafluoride (SF6), which has a critical temperature of 318.6 K (45.5°C) and a critical pressure of 3.76 MPa (37.6 bars), allowing for a simple experiment set-up.

The apparatus includes a transparent measuring cell that is highly resistant to leakage and compression. The volume inside the cell is changed via a finely adjustable handwheel, the change being indicated by a combination of a fixed and a rotary scale to an accuracy of 1/1000 of the maximum volume. The pressure is generated by a hydraulic system containing castor oil of medically approved quality. The measuring cell and hydraulic system are separated by a cap seal which rolls in as the volume increases. This design means the pressure gradient between the measuring cell and oil chamber is negligible. A manometer measures gas pressure instead of oil pressure without taking up any dead space inside the measuring cell. During transitions from the gaseous to the liquid phases and vice versa, it is therefore possible to observe the formation of the first drops of liquid and disappearance of the last gas bubbles.

The measuring cell is enclosed in a transparent water chamber. A circulation thermostat allows the temperature to be maintained at a highly constant value, which can be monitored by means of a thermometer. Practical indications of the volume, pressure and temperature permit easy recording of P-V or P-V-T diagrams providing qualitatively correct results. Pressure and temperature-dependent volumetric corrections also provide quantitatively accurate results comparing favorably with standard reference values.

Specifications

Critical temperature:

318.6 K (45.5°C)

Critical pressure:

3.76 MPa (37.6 bars)

Critical volume:

197.4 cm3/mol

Critical density:

0.74 g/mol

Critical density:

0.74 g/mol

Temperature range:

10 – 60°C

Maximum pressure:

6.0 MPa (60 bars)

Maximum volume:

15.7 cm³

Manometer diameter:

160 mm

Bore for temperature sensor:

6 mm dia.

Temperature control connections:

7 mm dia.

Reducing valve connection:

1/8“dia

Standard gas connection:

3.5 mm dia.

Dimensions:

380x200x400 mm

Weight:

7 kg approx.

Contents

• 1 Critical point apparatus (Includes hydraulic oil but not SF6 gas)
• 1 oil filling device
• 1 angled 1.3 mm hexagonal spanner for grub screw on rotary scale
• 1 Plastic hose: 3mm internal diameter
• 1 1/8" pipe screw connection (SW 11)
• 1 Fluorescent lamp

TEL-10400 Critical Point Apparatus

$4999

TEL-14400 Immersion/Circulation Thermostat

This immersion/circulation thermostat has a closed bath for thermostatic control of water tanks or external apparatus with non-flammable liquids at temperatures of up to 100 °C. The fully electronic continuous controller and powerful circulation pump with a rotatable pump housing ensure ideal bath circulation and, therefore, a high degree of temperature constancy. The rotary knob is used for analog setting of setpoint values. Actual values are indicated by a glass thermometer. Clearly visible indicator lights for heating functions and errors increase operational safety. Includes a connection for a continuous cooler, a cooling coil which makes use of tap water as the coolant, a thermometer with a display range of 0 - 100°C and a plug.

Specifications

Operating-temperature range:

25°C to 100°C

Temperature constancy:

± 0.05°C

Heating power:

1.5 kW

Pump pressure:

max. 0.15 bar

Delivery rate:

max. 8 l/min

Bath volume:

2.5 l to 3.5 l

Bath area / depth:

135 mm x 105 mm / 150 mm

TEL-14400 Immersion/Circulation Thermostat

$1999

TEL-11853 Digital Quick Response Pocket Thermometer

For instantaneous measurements on surfaces, in liquids, soft plastic media, air/gases, very small objects. For connection to a K-type NiCr-Ni measurement sensor. Sensor not included.

Specifications

Measuring range:

- 65° C to 1150° C / - 85° F to 1999° F in 2 ranges

Division:

0.1° C/1° C/F

Accuracy in lowest range:

0,05% of measured value ± 0,2% FS

Display:

3½-digit LCD display, 13 mm in height

Dimensions:

106x67x30 mm

Mass:

approx. 135 g

TEL-14853 Digital Quick Response Pocket Thermometer

$145

TEL-11854 K-Type NiCr-Ni Immersion Sensor, -65°C – 550°C

Temperature measurement sensor with stainless steel (V4A)-tube, spring-mounted (rigid) and silicone cable.

Specifications

Measuring range:

- 65° C to 550° C

Response time:

approx. 3 sec

Tube:

130 mm x 1.5 mm Ø

TEL-11854 K-Type NiCr-Ni Immersion Sensor

$59

TEL-SHCPLB Sulfur Hexafluoride Lab Bottle

One half pound of Sulfur Hexafluoride in a convenient and disposable lab bottle.

Specifications

Valve Outlet

CGA# 170

Purity

99.996% purity

TEL-SHCPLB K-Type Sulfur Hexafluoride Lab Bottle

$376

TEL-Y11 215A590 Regulator

One half pound of Sulfur Hexafluoride in a convenient and disposable lab bottle.

Specifications

Output Pressure

0-15 PSI

Input Pressure

up to 3000 PSI

TEL-Y11 215A590 Regulator

$310