Gas Actuated Thermometer WIKA model 73

Gas Actuated Thermometer WIKA model 73

Dial thermometers use a metal pointer on a circular scale to indicate temperature measurements. They have two main components: the needle and a temperature sensor.  The way a dial thermometer works depends on the type of thermometer it is. Options include bimetal, liquid or gas-filled and vapor-tension, they are described below.

The model 73 gas-actuated thermometer has been developed and is manufactured in accordance with the EN 13190 standard. The high-quality thermometer has been designed especially for the requirements of the process industry. Especially in the chemical and petrochemical, oil and gas, and power engineering industries, the thermometer completely manufactured from stainless steel is used successfully.

The stem, the process connection and the case of the gas-actuated thermometers are made from stainless steel. To allow optimum fitting to the process, individual insertion lengths and process connections are available. The thermometers have a high ingress protection of IP65 and can be used in outdoor applications even at negative temperatures. With liquid damping operation under high vibration, conditions are possible. Due to the wide variety of possible designs, the model 73 gas-actuated thermometers can be perfectly adapted to any process connection or location.

With the adjustable stem and dial version, the case can be adjusted precisely to the desired viewing angle. With the contact bulb version, temperature measurements are possible without any contact with the medium, even when the pipe diameter is extremely small. The contact bulb is intended for external mounting on pipes and tanks. When mounting this thermometer version, it must be ensured that the contact bulb is in contact with the measuring point over its complete length.

Applications of the gas-actuated thermometer

• General process instrumentation in the chemical and petrochemical industries, oil and gas industries, energy and water/wastewater industries
• Universally suitable for machine building, plant, tank, apparatus construction, and food industry
• Temperature measurement without any contact with the medium
• Mounting in instrument boards, control cabinets, control panels

Technical Data

Measuring principle

• Gas-pressure inert gas filling, physiologically safe

Nominal size in mm

• 100, 160

Connection designs

• S                Standard (threaded connection)
• 1                Plain stem (without thread)
• 2                Male nut
• 3                Union Nut
• 4               Compression fitting (sliding on the stem)
• 5               Union nut and loose threaded connection
• 6               Compression fitting (can be adjusted on either capillary or spiral protective sleeve)
• 7               Compression fitting at the case

Model

A73.100

• Dial: 100mm, Back mount (axial)

A73.160

• Dial: 160mm, Back mount (axial)

R73.100

• Dial: 100mm, Lower mount (radial)

R73.160

• Dial: 160mm, Lower mount (radial)

S73.100

• Dial: 100mm, Back mount, adjustable stem, and dial

S73.160

• Dial: 160mm, Back mount, adjustable stem, and dial

F73.100

• Dial: 100mm, Version with capillary

F73.160

• Dial: 160mm, Version with capillary

Accuracy class Class

• 1 per EN 13190 at 23 °C ±10 °C ambient temperature

Material

Case, ring

• Stainless steel 1.4301

Stem, process connection

• Stainless steel 316SS

Adjustable stem and dial

• version Stainless steel
• swiveling 90°
• rotatable 360°

Panel frame

• Steel galvanized

Capillary

• Ø 2 mm, stainless steel 1.4571, bending radius no less than 6 mm
• Length to customer specification

Dial

• Aluminium white, black lettering

Window

• Laminated safety glass

Pointer

• Aluminum, black, micro adjustment

Temperature limits for storage and transport

• -50 … +70 °C without liquid damping
• -40 … +70 °C with liquid damping

Permissible ambient temperature

• -40 … +60 °C without/with liquid damping