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     Width 2.55(65) long focal length F=∞
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Hot Air Heaters for Clean Heaters
CLH type

TEmission of dust and gas has been eliminated to a very minimum level.

The heating element, sensors and wires do not come in direct contact with the heating fluid and can be used for heating steam and slightly corrosive gases.

Heating element and temperature sensor are hermetically sealed inside the inner quartz tube.

Air is indirectly heated as it passes through the gap between the inner and outer quartz tubes.

* These heaters are very tough compared to ordinary heaters, and usage is limited to conditions which the metal case (made of stainless steel), quartz glass, and heat-resistant rubber (viton, silicon) can endure.

* These are clean heaters where the causes of dust generation have been eliminated, flush (flush and clean) thoroughly with clean air before use.

* These heaters are not suitable for heating fluids which contain substances that are likely to remain inside the heater.

Classification (Heating pipe diameter) Power range Metal case Remarks
CLH-10 series 110 W class 1,
150 W class
∅0.511 (13) x L113
∅0.511 (13) x L153
Technical data
CLH-15 series 250 W class ∅0.748 (19) x L168 Technical data
CLH-29 series 1000 W class ∅1.338 in (34 mm) x L300
CLH-38 series 1500 W class
3000 W class
∅1.69 in (43 mm) Technical data
CLH-45 series 3000 W class
4000 W class
∅1.96 in (50 mm) x L550
∅1.96 in (50 mm) x L680
Technical data
Low voltage type
1 kPa or less at 66.04 gal/min (250 L/min)
CLH-29 x 6 series 3000 W class
6000 W class
∅4.01 in (102 mm) x L550
∅4.01 in (102 mm) x L430
Bundle of 6 heating elements of 29 series
CLH-38 x 6 series 12 kW class ∅5.51 in (102 mm) x L500 Bundle of 6 heating elements of 38 series
Explanation of the relationship between flow rate, maximum hot air temperature, and operating life of CLH type

CLH is a heater without the discharge of dust and impure gases
CLH is used in the semiconductor manufacturing process
CLH can be used to heat steam etc. as the heat the source, sensors, or electric wires do not come in contact with the fluid.

Refer to the top menu and left menu for further information.
* Item Go Remarks
* Outline of hot air heater, instruction manual *Details on how to use the hot air heater
* Video of hot air heating * Videos on experiment of melting of solder and burning of wood
* Characteristics of hot air heater * Voltage, flow rate, hot air temperature, and air pressure characteristics of hot air heaters
* Dedicated controller for hot air heaters * A device to control the hot air heater to obtain hot air of required temperature and flow rate
* Information on air source * Introduction to various types of air source. Compressor, electromagnetic pump, rotary blower, etc.
* Product price * Price index list of all products.
Temperature measurement using a thermocouple Detailed measurement method, and data of K and R thermocouples
Calculation method for hot air heaters Calculation of required heater power, expected hot air temperature, and necessary flow rate

Service Life of the Temperature Sensor

The temperature of a part of the temperature sensor wire (thermocouple) rises to almost the same temperature as the heating element due to the CLH heater structure. This increase in temperature might reduce the service life of the temperature sensor.

The thick type K thermocouple is used in the sensor wherever possible, size of thermocouples is only about 0.02 in (ø0.65 mm) in small models due to which the service life reduces considerably depending on the usage conditions (heating element temperature).

When using heating element at high temperatures, it is safer to use external temperature sensors or R thermocouple (option) for built-in sensors.

Materials Used

In addition to the main materials stainless steel, quartz glass, fluorocarbon polymers and fluororubber, silicone-based adhesives are also used in this heater for maintaining adhesion and airtightness. Silicone RTV is used in these heaters unless otherwise specified. It is possible to replace silicone RTV with modified silicone-based adhesive, however, it is somewhat inferior in heat resistance (356ºF (180ºC) → 248°F (120ºC))

    To CLH-15 series

CLH-10 series



CLH-10 series characteristics



    To CLH-15 series

CLH-15 series



CLH-15 series characteristics



    CLH-29 series

CLH-29 series



    CLH-38 series

CLH-38 series





CLH38 series structure manual
    To CLH-29x6 series

CLH-45 series



Characteristics of the above heater



    To CLH-38x6 series

CLH-29x6 series



** Structure with 6 heaters bundled inside a heater, and each power supply lead wire is independently drawn out. Single phase, three phase delta or three phase star external connections are possible that can support various types of power supply



    To relationship between flow rate, maximum hot air temperature, and operating life of CLH type

CLH – 38x6 Series In 38 series, 6 heating elements are bundled inside the heater





Relationship of maximum hot air temperature and service life with the flow rate of CLH type



** From the above graph, it can be observed that if air is made to flow through the 200v-1.5kw CLH heater with a flow rate of 39.62 gal/min (150L/min), the temperature of the heating element exceeds 2012ºF (1100ºC) at 240 V and this temperature range has an adverse impact on the service life of the unit.

Even then, the hot air temperature is approximately 896ºF (480°C). In other words, the maximum hot air temperature when 39.62 gal/min (150 L/min) of air flows through this heater is 932ºF (500°C).

If the air flow rate is reduced to 18.49 gal/min (70 L/min), hot air of about 1202ºF (650°C) can be obtained at 200 V. The heating element temperature is approximately 1922ºF (1050ºC), and a long service life can be expected.

In other words, if the flow rate of air flowing through this heater is about 18.49 gal/min (70 L/min), then a hot air temperature of 600°C or more can be obtained with stability. Since the heating element and the fluid do not come in direct contact with each other in CLH heaters, the hot air temperature does not rise proportionally by increasing the heating element temperature using higher flow rates.

However, if the air flow rate is lowered, sufficient heat exchange take places and air of considerably high temperature can also be obtained.

The temperature of a part of the sensor wire (thermocouple) rises to almost the same temperature as the heating element due to the CLH heater structure. This increase in temperature might reduce the service life of the temperature sensor.

Typically, in this model, K thermocouple of ∅0.062 in (1.6 mm) is used in the sensor, which is of sufficient thickness and long service life can be expected with normal usage.

When using heating element at high temperatures, it is safer to use external temperature sensors or R thermocouple (option) for built-in sensors.