To ensure the safety and efficiency of a beverage filling line, a production facility requires a reliable method to verify the presence of pressurized saturated steam within a piping system before initiating the filling cycle. This application demands a high-temperature resistant, food-grade solution that combines local visual verification for operators with a programmable digital output for PLC integration.
- Process Media: Saturated steam at 25 to 50 psig (approx. 148°C).
- Regulatory Needs: FDA-compliant materials and hygienic process connections.
- Output Requirements: Programmable PNP switch for automated logic and a 4-digit LED display for manual monitoring.
- Thermal Protection: Integration of a cooling element to protect sensor electronics from extreme process temperatures.
The application involves the critical pre-operation verification of steam pressure in a beverage production piping system to ensure that sterilization or heating protocols are met before a filler process begins. Operating with saturated steam at pressures between 25 and 50 psig presents a significant thermal challenge, as temperatures reach approximately 148°C (298°F). Standard industrial sensors often fail in these conditions because their internal electronics and filling fluids are typically rated for a maximum of 125°C (257°F). To maintain system integrity and food safety, the instrumentation must utilize materials that prevent contamination while withstanding the aggressive thermal environment of a steam-in-place (SIP) or process steam line.
The solution utilizes the DS 200P series, which acts as a versatile hybrid of a digital gauge, pressure transmitter, and electronic switch. To address the high-temperature requirements, the device is configured with an integrated cooling element. This mechanical heat sink extends the media temperature capability up to 250°C (482°F) by providing a thermal buffer between the process connection and the electronic housing, ensuring long-term stability and preventing thermal drift. For the food-grade requirement, the internal sensing diaphragm is backed by an FDA-approved food-compatible oil fill. While a flush-welded stainless steel diaphragm is standard to prevent media buildup, the choice of process connection is a 1.5-inch Tri-clamp connection which is often utilized in these settings to meet 3-A or EHEDG sanitary standards, eliminating crevices where bacteria could propagate.
The DS 200P series provides a rotatable, 4-digit LED display that offers immediate feedback to floor technicians, allowing for manual verification of steam pressure at the point of use. Beyond the visual display, the primary advantage for the PLC-controlled filler is the programmable PNP contact. This switch can be configured with specific set points, reset points, and delay times directly on the device, allowing the sensor to send a “ready” signal to the PLC only when the steam pressure is within the safe operational window.
DS 200P 3-A Compliant Electronic Pressure Switch
- Part No: 500-2500-1-5-100-C61-1-0-2-000
- Pressure Range: 0 to 4 bar gauge (approx. 58 psi)
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% FSO
- Switch Output: 1 PNP switch
- Electrical Connection: M12 x 1, 5 pin metal connector
- Process Connection: Clamp 1 1/2″ DN32 (DIN 32676), 3A
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: Food grade, 250degC max (Vac 150degC) max