Watlow Immersion Heater

Structure and Installation: Heaters are usually designed with long components to increase the contact length with the medium and improve heating efficiency. At the same time, the flowability of the medium should be considered during installation to avoid the heater being covered by sediment and affecting heat transfer. In addition, explosion-proof terminal boxes can be selected to adapt to the combustible gas environment that may be generated during the heating process of heavy oil.

（3） Heating in other special scenarios

1. Forced air heating

Product type: Multiple choice 1.25-inch NPT WATROD element heater, sheath material is 304 stainless steel, power 1.0-2.0kW, voltage 120/240VAC, such as model BEN13G6S, power 1.0kW, voltage 120/240VAC, can be used with a fan to achieve forced air circulation heating, suitable for winter insulation in small workshops and equipment rooms.

Protection requirements: The terminal box should be dust-proof to prevent dust from entering and affecting electrical performance. At the same time, the installation position of the heater should be away from flammable materials to prevent fire risks.

2. Heating of corrosive solutions

Special material selection: The sheath material is made of Hastelloy C276 or titanium alloy, and the plug material is 316 stainless steel to resist corrosion from solutions. For example, a 2.5-inch NPT WATROD heater with a sheath material of Hastelloy C276, a power of 3.0kW, a voltage of 240VAC, suitable for heating acidic solutions; 1.25-inch NPT WATROD heater with titanium alloy sheath material, power of 0.7kW, voltage of 120VAC, suitable for heating alkaline solutions.

Sealing and Protection: The connection between components and plugs adopts a special welding process to ensure sealing performance and prevent solution from infiltrating and corroding electrical components. The terminal box adopts a fully sealed moisture-proof and explosion-proof type to further improve the protection level.

Ordering Information and Delivery

（1） Model coding rules

The model code contains multiple parameter information. Taking the screw plug heater as an example, such as "BCN4J1S2":

BC ": represents the basic series (screw plug type, WATROD component);

N ": indicates the material of the plug (brass);

4 ": corresponds to size" B "(4.5 inches, 114mm);

J ": Component diameter (0.315 inches, 8mm);

1: Voltage (120VAC);

S ": Terminal box type (universal type);

2 ": Thermostat type (Type 2, temperature range 30-250 ° F).

The core configuration of the heater can be quickly identified through model coding, facilitating accurate ordering.

（2） Delivery cycle

Standard products: Products with the "RS" logo support next day shipping, such as most 1-inch and 1.25-inch NPT spiral plug heaters, meeting emergency needs. For example, models BCN4J1S2, BDNF 13A27S5A, etc. have sufficient inventory and can be arranged for shipment the next day after placing an order.

Customized products: Customized products that require special materials, sizes, or functions, with a delivery cycle determined by specific needs, usually 2-4 weeks. For example, the selection of Hastelloy C276 sheathed heaters, customized size flange heaters, etc. require material procurement, processing and manufacturing, testing and other processes, with a relatively long delivery cycle.

（3） Accessories ordering

Sealing accessories: Multiple materials of gaskets are available, such as rubber gaskets (suitable for water-based media), asbestos free gaskets (suitable for general industrial scenarios), and wound gaskets (suitable for high-pressure conditions), which can be selected according to the usage scenario and pressure level of the heater.

Installation accessories: including lifting lugs (for easy installation and disassembly of large heaters), baffles (to prevent direct impact of media on components, protect components), extended lead thermocouples (for remote temperature monitoring), etc., can be ordered separately according to actual installation needs.

Key points for installation and maintenance

（1） Installation requirements

Immersion depth: The unheated section of the heater needs to be completely immersed in the heated medium, ensuring at least 1 inch (25mm) of unheated section is inside the medium to prevent overheating and damage to the unheated section. For example, in clean water heating, the unheated section of a 1-inch NPT heater needs to be completely submerged below the water surface to avoid exposure to air.

Installation position: The heater should be installed in the lower area of the container, but higher than the sediment layer at the bottom of the container, to prevent sediment from covering the components and affecting heat transfer. At the same time, it facilitates natural convection of the medium and improves heating uniformity. For containers with stirring devices, the heater should be installed within the range of the stirring blades to further enhance heat transfer.

Flow direction and angle: When installing the FIREBAR element heater, the installation angle of the element needs to be determined based on the flow direction of the medium, usually at a certain angle (such as 45 °) to reduce pressure loss and improve heat transfer efficiency. For example, in process water heating, FIREBAR components should be installed in the direction of water flow to avoid direct impact of water flow on the components causing wear.