Siemens SITRANS P420

Siemens SITRANS P420 Specification

Control System
HART protocol communication

Theory
Pressure Transmitter (Measurement) - Piezoresistive/Capacitive

Voltage
10.8 ... 45 V DC

Inlet/Outlet
1/2-inch NPT female or G1/2 female

Caliber
Nozzle Size: 1/2 / G1/2

Frequency
Not applicable (DC powered)

Mounting Type
2 pipe or wall mounting

Discharge Pressure
Up to 400 bar (special models)

Features
Display with backlight, local operation, SIL approval, corrosion-resistant

Noise Level
<35 dB(A)

Working Temperature
-40C ... +85C

Material
Stainless Steel 316L (measuring cell); Stainless Steel 316Ti/316L (housing)

Structure
Compact, robust, single chamber housing

Power
<1.0 W

Standard
ATEX, IECEx, FM, CSA, EAC, SIL 2/3

Pressure
Measuring range: 20 mbar to 40 bar (varies by variant)

Usage
Industrial Process Measurement

Application
Measurement of gauge and absolute pressure of gases, liquids and steam

Seals Type
FPM, EPDM, NBR optional

Output Signal
4 ... 20 mA with HART 7.0

Response Time
<120 ms

Ingress Protection
IP67/NEMA 4X

Linearity
0.075% of calibrated span

Mounting Bracket
Optional SS304, SS316 available

Weight
~3.0 kg (depending on version)

Long-term Stability
0.2% of URL/5 years

Connection Cable Entry
2 x M20 x 1.5 or 2 x 12" NPT

Explosion Protection
Ex d, Ex ia (ATEX, IECEx, FM, CSA etc.)

Ambient Humidity
0 ... 100% RH (condensate allowed)

Display Type
Optional, graphical display with push buttons

Zero/Span Adjustment
Local and remote via HART

Siemens SITRANS P420 Trade Information

Minimum Order Quantity
1 Unit

Delivery Time
1 Week

About Siemens SITRANS P420

The Siemens SITRANS P420 is a high-performance digital pressure transmitter designed for industrial applications that require high accuracy and advanced safety features. It is a "Ready for Digitalization" device, notably featuring Remote Safety Handling, which allows users to program and validate SIL (Safety Integrity Level) functions directly from a control room rather than on-site.

Accuracy: Up to (0.04%).
Measuring Range: Covers from (20text{ mbar}) up to (700text{ bar}).
Safety Rating: Suitable for SIL 2/3 applications in accordance with IEC 61508.
Long-Term Stability: (leq 0.125%) over 5 years, with test proof intervals of up to 15 years.
Communication: Supports HART 7, PROFIBUS PA, and FOUNDATION Fieldbus.
Materials: Robust construction with diaphragms available in stainless steel, Hastelloy, tantalum, Monel, and gold to withstand harsh chemical loads.

Advanced Measurement Reliability

The SITRANS P420 ensures stable and highly accurate pressure measurements even in challenging process environments. Its piezoresistive/capacitive technology delivers exceptional linearity (0.075% of span) and maintains stability (0.2% of URL over 5 years), making it suitable for mission-critical applications.

Versatile Installation and Communication

With flexible cable entries (M20 x 1.5 or 1/2" NPT) and both wall and pipe mounting options, the transmitter adapts to diverse setups. HART 7.0 protocol support enables seamless integration and remote calibration, while the optional graphical display enhances on-site usability.

Certified Durability and Explosion Safety

Precision-engineered with stainless steel and protected up to IP67/NEMA 4X, the SITRANS P420 meets stringent global safety and explosion-proof standards (ATEX, IECEx, FM, CSA, EAC). It performs reliably in harsh process conditions, including high humidity, temperature extremes, and hazardous areas.

FAQ's of Siemens SITRANS P420:

Q: How can I adjust the zero and span settings on the Siemens SITRANS P420?

A: The zero and span adjustments can be made locally using the optional graphical display with push buttons on the device, or remotely via HART protocol communication, making calibration both accessible and convenient.

Q: What are the main industrial applications for the SITRANS P420 pressure transmitter?

A: The SITRANS P420 is used for measuring gauge and absolute pressure of gases, liquids, and steam in industrial processes such as chemical plants, oil and gas installations, power generation, and food and beverage manufacturing.

Q: When is explosion protection required and what certifications does the P420 offer?

A: Explosion protection is essential in hazardous environments where flammable gases or dust may be present. The SITRANS P420 meets major international standards including ATEX, IECEx, FM, and CSA for both Ex d and Ex ia protection types.

Q: Where can I install the SITRANS P420, and what mounting options are available?

A: The transmitter supports flexible installation, including wall and 2-pipe mounting. Optional stainless steel brackets (SS304 or SS316) are available to accommodate site-specific requirements.

Q: What is the process for integrating and configuring the SITRANS P420 in a control system?

A: The transmitter is easily integrated via its 4 ... 20 mA output with HART 7.0 protocol. Configuration and diagnostics can be performed locally on the device or remotely using HART-compatible software or handheld communicators.

Q: How does the SITRANS P420 benefit ongoing operation and system safety?

A: With SIL 2/3 approvals for functional safety, the device ensures reliable and safe operation in safety-critical processes. Its long-term stability, corrosion resistance, and fast response time (<120 ms) reduce maintenance and enhance process efficiency.