Sample Coolers | Gestra

GESTRA PK 40 – Sample Cooler for Boiler Water and Condensates

The GESTRA PK 40 is utilized for safe sampling of boiler water, feedwater, and condensates. Cooling the sample prior to analysis minimizes flashing, which can distort TDS, pH, and oxygen measurements, particularly in high-temperature samples from pressurized circuits.

Operating Principle

The sample passes through a high-pressure needle valve and then through a cooling coil. The cooling water flows counter-currently within the cooler body. The outlet temperature is monitored with a sample thermometer, and the flow is manually adjusted via the needle valve.

Technical Specifications PK 40

• Body and coil material: stainless steel 1.4571
• Needle valve: 1.4571
• Cooling water ball valve: 1.4408
• Cooling capacity: 1.5 kW for sample at 200 °C, 7 l/h, referenced to 25 °C
• Maximum body pressure: 10 bar
• Maximum body temperature: 100 °C
• Maximum coil pressure: 40 bar
• Maximum coil temperature: 260 °C
• Standard version: approx. 8 kg
• Laboratory version on base: approx. 20 kg

Connections

The standard version features a sample inlet with 8 mm progressive ring fitting, a sample outlet with 8 × 1 mm tube, a cooling water inlet G ½, and a cooling water outlet ¾". The laboratory version uses 12 mm connections for sample IN/OUT and G ½ A for cooling water.

Applications

• Boiler blowdown and conductivity control,
• Sampling from steam generators,
• Feedwater tanks,
• Condensate collection vessels,
• Laboratory water analysis in boiler rooms.

Standards / Documentation

The data sheet mentions the possibility of material certification according to DIN EN 10204-3.1 upon request. PED classification should be verified per project, especially when pressure, temperature, or fluid category changes.

FAQ

Why not take a hot sample directly?
Because part of the water flashes to steam, artificially increasing salt concentration.

Is there automation?
Not in the standard version. Adjustment is manual via needle valve and outlet temperature control.