PRIMA HEATER FLOW METER REGULATOR - CO2 (838CR-H 220V)

The PRIMA CO2 Flowmeter Regulator with Heater Model 838CR-H is a specialized device used to control the pressure and measure the flow rate of carbon dioxide CO2 gas, typically in applications like MIG/TIG welding (as a shielding gas regulator) and beverage dispensing systems.

The specific model you mentioned, the 838CR-H 220V, indicates it is equipped with a heating element designed to operate on a 220V power supply.

Key Features and Specifications

The PRIMA 838CR-H model is certified to Standard EN ISO 2503 and includes several features for safety and reliable operation:

• Gas Type: Carbon Dioxide CO2.

• Body Material: Rugged Forged Brass for strength and safety.

• Flow Rate Range: Typically 0 - 25 L/min (liters per minute).

• Inlet Pressure Gauge: Calibrated for high-pressure CO2 gas, usually up to 4,500 psi (or approx 310bar).

• Heater: Built-in heater to prevent freezing of the regulator, powered by 220V (other variants exist for 36V or 110V).

• Flowmeter: Features a transparent polycarbonate outer cover for easy reading and 360circ visibility.

• Safety Feature: Includes an External Safety Relief Valve on the high-pressure side.

• Inlet: Side Entry inlet stem.

Why a Heater is Necessary for CO2 Regulators

A heater is a critical component for CO2 regulators, especially in high-flow rate applications (like production welding) or in cold environments .

• Joule-Thomson Effect: When compressed CO2 gas rapidly expands from the high-pressure cylinder 4,500 psi down to the lower working pressure, it undergoes an extreme temperature drop due to the Joule-Thomson effect.

• Freezing: Since CO2 changes from a high-pressure liquid/gas mix in the cylinder to a gas, this rapid cooling can cause the formation of dry ice (solid CO2 or frost/ice on the regulator's internal components and outlet.

• Flow Interruption: The ice buildup can block the flow path and freeze the regulator's moving parts, leading to pressure inconsistencies or a complete stoppage of the gas flow.

• Heater Function: The built-in electric heater warms the regulator body, counteracting the cooling effect and preventing freeze-up. This ensures a consistent, stable flow rate and pressure of the CO2 gas to the application.