Darui Electric recommends
SRY2, SRY3 Tubular Electric Heaters are used for heating oil in open or closed oil tanks. SRY4 Tubular Electric Heater is used for heating flowing or circulating oil.
II. Specifications and Technical Data
1. Specifications and dimensions: see table and Figure 2
Note: The mounting hole for SRY2 and SRY4 is Ø72 mm
2. Working voltage tolerance: not greater than 1.1 times the rated value; the shell must be effectively grounded.
3. Working environment: relative humidity not greater than 95%, no explosive or corrosive gases.
4. Metal tube material: No. 10 steel.
5. Maximum working temperature: SRY2, SRY3 300°C, SRY4 100°C.
6. Working pressure for SRY2 and SRY4: less than 2 kg/cm².
7. Fastener length for SRY3: 25 mm.
III. Usage, Maintenance, and Precautions
1. Dimension "B" in the outline drawing must be fully immersed in oil to avoid damaging the element. The heated oil should be non-corrosive.
2. For SRY3, the working liquid level must be below the fastener and above the dimension line "B".
3. When melting solid oils such as asphalt or paraffin, reduce the voltage during use, then increase to rated voltage after melting to prevent heat concentration and reduce element service life.
4. If carbon deposits are found on the tube surface, they must be removed before reuse to avoid reduced efficiency or even element burnout.
5. The element should be stored in a dry place. If the insulation resistance drops below 1 MΩ due to long-term storage, it can be restored by drying in an oven at about 200°C for several hours (or by applying low voltage to the element for several hours).
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
