Description
The METSO IOP345 is a high-performance, compact pressure transmitter engineered for demanding process applications where space constraints and reliability are critical factors. As an integral component of Metso’s (now part of Neles/Valmet) advanced instrumentation portfolio, this device provides precise measurement of gauge, absolute, or differential pressure in a significantly reduced footprint compared to conventional transmitters. The core function of the IOP345 is to convert applied pressure into a highly accurate 4-20 mA electrical signal with integrated HART digital communication, transmitting this vital process data to control systems such as DCS or PLC platforms. This compact transmitter is specifically designed for applications where installation space is limited, such as skid-mounted equipment, compact manifolds, or densely populated control panels, without compromising on measurement performance or durability.
The IOP345 delivers exceptional value through its combination of miniaturized design and robust performance characteristics. Despite its compact dimensions, the transmitter maintains high measurement accuracy and stability, making it suitable for a wide range of industrial applications including chemical processing, oil and gas, and water treatment. Its rugged construction ensures reliable operation in challenging environments with exposure to vibration, temperature variations, and corrosive atmospheres. The METSO IOP345 incorporates modern sensor technology and intelligent features that enable easy configuration, comprehensive diagnostics, and long-term reliability. This transmitter represents an optimal solution for applications requiring high-density instrument installations or where weight and space considerations are paramount, providing full-featured pressure measurement capability in a space-efficient package.

IOP345 METSO
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | IOP345 |
| Manufacturer | METSO (Now Neles, part of Valmet) |
| Product Type | Compact Pressure Transmitter |
| Pressure Types | Gauge, Absolute, Differential |
| Measuring Range | Various ranges (e.g., 0-100 mbar to 0-400 bar) |
| Static Pressure Rating | High, typically up to 400 bar (model dependent) |
| Output Signal | 4-20 mA HART, two-wire |
| Accuracy | High, typically ±0.1% of span |
| Long-Term Stability | Excellent, typically < ±0.1% of URL per year |
| Process Connection | ¼” NPT, G½”, or compact flange options |
| Diaphragm Material | 316L Stainless Steel, Hastelloy C-276 |
| Housing Material | Stainless steel or engineered polymer |
| Protection Class | IP66 / IP67 / Type 4X |
| Operating Temperature | -40°C to +85°C (electronics); -40°C to +120°C (process) |
| Weight | Significant reduction vs. standard transmitters (e.g., <1> |
| Dimensions | Compact design, typically <100mm> |
| Response Time | User-adjustable damping |
| Safety Certifications | SIL 2 capable (IEC 61508) |
Main Features and Advantages
The METSO IOP345 offers significant advantages through its innovative compact design without compromising performance. The most notable feature is its space-saving footprint, which enables installation in locations where conventional transmitters cannot fit, particularly beneficial for skid-mounted equipment, modular process units, and applications with high instrument density. Despite its reduced size, the IOP345 maintains high measurement accuracy and excellent long-term stability through advanced sensor technology that compensates for temperature effects and mechanical stresses. The transmitter features a robust, lightweight housing that provides corrosion resistance and durability while minimizing weight load on process connections.
The IOP345 incorporates user-friendly features including a local operator interface with clear display and intuitive push-button configuration, allowing for easy setup and troubleshooting without additional tools. HART communication capability enables remote configuration, calibration, and diagnostics, facilitating integration into modern asset management systems. The transmitter’s design includes versatile mounting options with multiple process connection choices to accommodate various installation requirements. Enhanced dynamic performance with adjustable damping allows optimization for specific process conditions, ensuring stable readings in applications with pressure pulsations or rapid changes. The combination of compact dimensions, full functionality, and reliable performance makes the IOP345 an ideal solution for modern process plants where space optimization and installation efficiency are critical requirements.
Application Field
The METSO IOP345 finds extensive application across industries where space constraints and measurement reliability are equally important. In chemical and pharmaceutical processing, it is ideal for skid-mounted systems, reactor pressure monitoring, and compact process modules where multiple instruments must be installed in limited spaces. The oil and gas industry utilizes the IOP345 for offshore platforms, subsea applications, and mobile processing units where weight and space savings are critical operational considerations. In water and wastewater treatment, the transmitter’s compact size makes it suitable for package plants, pumping stations, and filter pressure monitoring where equipment space is typically constrained.
The power generation sector employs the IOP345 for auxiliary system monitoring, turbine island applications, and compact heat exchange systems where dense instrument arrangements are common. Manufacturing and industrial machinery applications benefit from the transmitter’s small footprint for hydraulic system monitoring, compressor control, and equipment pressure protection. Essentially, the IOP345 is specified for applications where conventional transmitter dimensions would compromise system design, installation accessibility, or maintenance efficiency. Its ability to deliver full-performance pressure measurement in a minimized package makes it particularly valuable for modern compact process designs, equipment OEM applications, and facility upgrade projects where space optimization is essential.

IOP345 METSO
Related Products
IOP341: A standard-size pressure transmitter from the same family for applications without space constraints.
IOP114: A general-purpose pressure transmitter with different performance characteristics.
Compact Valve Manifolds: Space-saving manifolds designed to complement the IOP345‘s compact dimensions.
Mounting Brackets: Specialized mounting hardware optimized for the IOP345‘s compact design.
Metso FieldCare: Asset management software for configuration and monitoring of the IOP345.
IOT Compact Series: Complementary temperature transmitters with similar compact dimensions.
Compact Junction Boxes: Space-optimized enclosures for IOP345 installations in classified areas.



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