The Siemens SITRANS P, Series DSIII Transmitters (Models 7MF4*33-...) are designed for reliable, accurate, stable, and cost-effective measurement of pressure, differential pressure, flanged level, and absolute pressure. This installation guide provides essential mechanical and electrical setup information for experienced installers, complementing the more detailed User's Manual (UMSITRPDS3-1) found on the Siemens Process Instrumentation User Manual CD.
Function Description:
These transmitters are used in industrial settings to measure various pressure types and liquid levels. They convert these physical measurements into an analog output signal, typically 4-20 mA, for integration into control systems. The DSIII series is designed for robust performance in diverse environments, including hazardous areas, thanks to its intrinsically safe, explosion-proof, and NEMA 4x (IP67/68) hardened enclosure. The design allows for flexible mounting and orientation, with features to simplify installation and maintenance.
Important Technical Specifications:
- Models Covered: 7MF4033 (Gauge Pressure), 7MF4133 (Gauge/Absolute Pressure), 7MF4233 (Absolute Pressure), 7MF4333 (Differential/Absolute Pressure), 7MF4433 (Differential Pressure), 7MF4533 (Differential Pressure), 7MF4633 (Flanged Liquid Level), and 7MF4812 (Flanged Liquid Level).
- Enclosure: Intrinsically safe, explosion-proof, NEMA 4x (IP67/68), field mountable, hardened enclosure.
- Electrical Conduit Connections: User-selected 1/2-14 NPT or M20 x 1.5.
- Process Wetted Materials: All process wetted materials are 316 stainless steel or better.
- Flush-Mount Process Connection: Compatible with standard ANSI and metric flange sizes for tanks and pipes (for liquid level models).
- Power Supply: DC 10.5-45V (not intrinsically safe), Output: 4-20 mA.
- Hazardous Area Approvals: FM (XP/DIP) or (IS) CL I ZN 0/1 AEx ia IIC T4..T6 (FM), Ex ia IIC T4..T6 (CSA cert.2000.1153651), CL I DIV 1, GP ABCD T4..T6; CL II, DIV 1, GP EFG; CL III.
- Temperature Ratings: Ta = T4: -40..85°C; T6: -40..60°C.
- Ingress Protection: IP 65.
- Wire Size: Terminals accommodate wire sizes up to 16 AWG (1.3 mm²).
- Enclosure Ground: A dedicated enclosure ground screw is provided for connecting to earth ground.
Usage Features:
- Display: Optional digital display for local reading of measurements. The display and enclosure can be rotated for optimal viewing, regardless of the transmitter's mounting orientation. The display can be rotated in 90° increments.
- Magnetic Pushbuttons: Hinged access cover over magnetic pushbuttons allows for local configuration and interaction without opening the enclosure.
- Field Terminals: Located at opposite ends of the enclosure, accessible by removing the enclosure cap. Analog output test terminals are also provided.
- Mounting Flexibility: Can be mounted with optional bracket kits or user-supplied brackets. Gauge transmitters can be mounted in a PMC-style process connection, and differential transmitters can be nipple-mounted on an orifice flange. Liquid level transmitters can be flange-mounted directly on a vessel.
- Zero Shift Compensation: Any zero shift caused by mounting position can be calibrated out once the transmitter is in its final mounting position.
- Easy Access to Documentation: The User's Manual is provided on a CD and is also available for download from the Siemens public Internet site, ensuring users have access to comprehensive information.
Maintenance Features:
- Rating and Approval Plates: Clearly visible on the outside of the transmitter enclosure, providing model number, serial number, performance data, and approval/certification data. These are crucial for confirming correct model and compliance before installation or servicing.
- Tag Plate: Fastened with two screws, allowing for easy removal for engraving.
- Enclosure Rotation: The enclosure can be rotated approximately 135° in either direction relative to the measuring cell to clear obstructions or facilitate display viewing. A setscrew secures the enclosure in place.
- Display Repositioning: The optional display can be removed and rotated in 90° increments to improve readability.
- Conduit Drain and Explosion Proof Installations: Specific guidelines and components (e.g., drain seals, conduit seals like Crouse-Hinds Type EYS) are provided for proper electrical conduit installation, especially in hazardous areas, to ensure safety and compliance.
- Process Connection Maintenance: For PMC-style connections, detailed instructions are provided for nipple installation, including welding procedures, O-ring insertion, and tightening of the lock-ring nut. Warnings are given to prevent damage to the measuring cell diaphragm and to ensure proper welding techniques.
- Support Resources: Siemens provides extensive customer support, including online support requests, technical support phone numbers, customer service for returns, and a public internet site with technical publications in PDF format.
- Decontamination Requirement: Instruments must be thoroughly cleaned and decontaminated before being returned for repair, emphasizing safety when handling process materials.
The SITRANS P, Series DSIII Transmitters are designed for ease of installation and long-term reliability, with comprehensive documentation and support to assist users throughout the product lifecycle.
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