Honeywell STD825 Differential Pressure Transmitter

Honeywell STD825 Differential Pressure Transmitter: Complete Technical Specifications & Performance Data

Product Overview

The Honeywell STD825 Differential Pressure Transmitter is a member of the SmartLine® ST800 family, engineered as a high-performance differential pressure measurement solution built around advanced piezoresistive sensor technology-1. The Honeywell STD825 Differential Pressure Transmitter integrates differential pressure sensing with on-chip static pressure and temperature compensation, delivering exceptional measurement accuracy and long-term stability across a wide range of process and ambient conditions.

The SmartLine family has been fully tested and complies with Experion® PKS standards, ensuring the highest level of compatibility assurance and seamless integration capabilities-1. The Honeywell STD825 Differential Pressure Transmitter is specifically designed for critical process loops and high-value applications where mid-range differential pressure measurement with exceptional stability is required-24.

Within the ST800 series lineup, the STD825 occupies a unique position between the STD820 (URL 100 KPa) and the STD830 (URL 700 KPa), making the Honeywell STD825 Differential Pressure Transmitter an ideal choice for applications requiring a 150 KPa maximum range with superior resolution-2.

Performance Specifications

Pressure Ranges and Limits

The Honeywell STD825 Differential Pressure Transmitter features a differential pressure range of -150 to 150 KPa with an upper range limit (URL) of 150 KPa (approximately 21.75 psi) and a lower range limit (LRL) of -150 KPa-2. The minimum span for the Honeywell STD825 Differential Pressure Transmitter is 1.5 KPa, making it suitable for applications requiring fine differential pressure resolution in the mid-pressure segment-2-1.

The Honeywell STD825 Differential Pressure Transmitter offers a turndown ratio of up to 100:1, providing exceptional rangeability that reduces inventory requirements and allows a single device to cover multiple measurement scenarios-26. The static pressure capability for the Honeywell STD825 Differential Pressure Transmitter is rated up to 31.5 MPa standard, with an optional upgrade to 42 MPa depending on configuration-.

Accuracy and Long-Term Stability

The Honeywell STD825 Differential Pressure Transmitter delivers reference accuracy of up to 0.035% of calibrated span as standard, with an optional 0.025% accuracy available for critical applications requiring the highest measurement precision-26-1.

Long-term stability for the Honeywell STD825 Differential Pressure Transmitter is rated at 0.01% of URL per year, sustained over a period of 10 years of continuous operation-1-4. The Honeywell STD825 Differential Pressure Transmitter also offers an optional 15-year warranty for applications requiring extended reliability assurance-2-4.

Dynamic Response

The Honeywell STD825 Differential Pressure Transmitter achieves a dynamic response time as fast as 90 milliseconds, enabling rapid detection of process changes and real-time control loop performance-1.

Automatic Compensation

Automatic static pressure and temperature compensation is embedded directly into the sensor chip architecture, ensuring that the Honeywell STD825 Differential Pressure Transmitter maintains accuracy even under fluctuating process and environmental conditions-1-2. The piezoresistive sensor technology integrated into the Honeywell STD825 Differential Pressure Transmitter combines multiple sensor elements on a single chip, allowing real-time correction of errors induced by static pressure and temperature variations-1.

Environmental Specifications

The Honeywell STD825 Differential Pressure Transmitter is designed for reliable operation in harsh industrial environments across the following parameters:

Ambient Operating Temperature: -40°C to +85°C-15

Storage Temperature: -55°C to +120°C

LCD Display Operating Temperature: -20°C to +70°C

Ingress Protection: NEMA 4X, IP66/IP67 ratings-4

Relative Humidity: 0 to 100% RH

These environmental specifications ensure that the Honeywell STD825 Differential Pressure Transmitter maintains performance integrity in outdoor installations, washdown areas, extreme climate conditions, and hazardous area classifications.

Materials of Construction

Wetted Materials

The Honeywell STD825 Differential Pressure Transmitter offers a comprehensive selection of wetted materials to accommodate a wide variety of process media and corrosive environments:

316L Stainless Steel – Standard option for general industrial applications

Hastelloy® C-276 – For highly corrosive and acidic media

Monel® 400 – Suitable for seawater and reducing acid environments

Tantalum – For extreme corrosion resistance in aggressive chemical service

Gold-Plated options – For specialized applications requiring enhanced surface protection-

Head gasket materials for the Honeywell STD825 Differential Pressure Transmitter include glass-filled PTFE as standard, with Viton and graphite available as optional upgrades-.

Enclosure and Housing

The Honeywell STD825 Differential Pressure Transmitter is housed in a low-copper (<0.4%) aluminum alloy enclosure with pure polyester powder coating, providing excellent corrosion resistance in industrial environments-15. A stainless steel housing option is available for applications requiring enhanced durability and marine-grade protection.

Process Connections

The Honeywell STD825 Differential Pressure Transmitter supports 1/4″-NPT or 1/2″-NPT process connections with adapter fittings that meet DIN requirements-15. The transmitter employs a traditional 54 mm center, kidney-shaped flange design compatible with a wide range of industrial process connections-.

Electrical Specifications and Communication

Output and Communication Protocols

The Honeywell STD825 Differential Pressure Transmitter supports multiple communication protocols to accommodate various control system architectures:

4-20 mA dc with HART® (Version 7.0) – 10.8 to 42.4 VDC supply voltage-1-15

Honeywell Digitally Enhanced (DE) Protocol – 15 to 49.3 VDC supply voltage

FOUNDATION™ Fieldbus Protocol – 9 to 32 VDC supply voltage

All variants of the Honeywell STD825 Differential Pressure Transmitter support the above communication protocols, and the transmitter includes polarity insensitive electrical connections that simplify installation and reduce the risk of wiring errors-1.

Dual/Triple Calibration

The Honeywell STD825 Differential Pressure Transmitter offers dual/triple calibration options for HART and Fieldbus versions, enabling flexible configuration across different control system interfaces-1-.

Display and Configuration

Display Options

The Honeywell STD825 Differential Pressure Transmitter features a modular LCD display that can be added or removed in the field without affecting performance or certification status. Two display options are available:

Basic Alphanumeric LCD Display:

Modular design (field-addable or removable)

0°, 90°, 180°, and 270° position adjustment for optimal viewing

Configurable and standard measurement units including Pa, KPa, MPa, KGcm², Torr, ATM, inH₂O, mH₂O, bar, mbar, inHg, ftH₂O, mmH₂O, mmHg, and psi

2 lines, 16 characters per line (4.13 mm high × 1.83 mm wide)

Square root output indication-1-4

Advanced Graphic LCD Display:

Modular design (field-addable or removable)

0°, 90°, 180°, and 270° position adjustment

Standard and custom measurement unit support

Up to 8 configurable screens in 3 formats (large PV with bar graph or trend graph)

Configurable screen cycle time (1 to 30 seconds)

Independent square root display function from 4-20 mA dc output

Unique “health information” display for quick diagnostic visibility

Multi-language support: English, German, French, Italian, Spanish, Russian, Turkish, Chinese, and Japanese-1-4

External Configuration

The Honeywell STD825 Differential Pressure Transmitter provides external zero, span, and configuration capability via three externally accessible buttons, enabling field adjustments without opening the enclosure-1-4. The Honeywell STD825 Differential Pressure Transmitter can be configured using multiple methods, including handheld configuration tools such as the Honeywell Versatilis Configurator (MCT202/MCT404)-4.

Diagnostics and Safety Features

On-Board Diagnostics

The Honeywell STD825 Differential Pressure Transmitter incorporates comprehensive on-board diagnostic capabilities that provide advanced warning of potential failure events, minimizing unplanned shutdowns and reducing overall operational costs:

Plugged Impulse Line Detection (PILD) – Identifies blocked impulse lines before they affect measurement accuracy, based on statistical models that continuously compare baseline operating noise patterns-

NAMUR NE-107 Extended Diagnostics – Provides standardized diagnostic status signals for Foundation Fieldbus communications-

Dual/Triple Calibration Option – Available for HART and Fieldbus versions

Integrated self-monitoring – Continuous verification of sensor and electronics health

Comprehensive integrated diagnostics – Digitally accessible diagnostic information to alert possible failure events-4

Safety Design and Certifications

The Honeywell STD825 Differential Pressure Transmitter features an integral dual seal design conforming to ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 standards, providing the highest level of safety for applications where primary pressure containment failure could lead to hazardous conditions-1-4.

The Honeywell STD825 Differential Pressure Transmitter offers world-class overpressure protection and is certified for use in safety instrumented systems with full compliance to SIL 2/3 requirements-1-2.

Agency Approvals

The Honeywell STD825 Differential Pressure Transmitter carries multiple international certifications for hazardous area installations, including:

FM, CSA, ATEX, IECEx, NEPSI, KOSHA, EAC, CCoE, SAEx, INMETRO-

Explosion-proof, Intrinsically Safe, and Non-incendive classifications available

Marine approvals available for shipboard and offshore installations

Physical Specifications

Weight: Approximately 3.8 kg (8.4 lbs) with aluminum housing-15

Conduit acceptance: Accommodates up to 16 AWG (1.5 mm diameter) wire

Static pressure limit: 31.5 MPa (standard), 42 MPa (optional)-

Verification interval: Standard calibration verification recommended every 4 years-26

Application Suitability

The Honeywell STD825 Differential Pressure Transmitter is ideally suited for a wide spectrum of measurement applications requiring mid-range differential pressure measurement with high accuracy and reliability. The 150 KPa differential pressure range with 1.5 KPa minimum span makes the Honeywell STD825 Differential Pressure Transmitter particularly well-suited for:

Custody transfer applications requiring high accuracy measurement

Energy and material balance calculations

Flow measurement with primary flow elements (orifices, venturis, nozzles)

Hydrostatic tank gauging in closed vessels

Filter monitoring and differential pressure across filtration systems-

Pump and compressor performance monitoring

Heat exchanger and condenser differential pressure monitoring

Process control loops requiring fast dynamic response

The Honeywell STD825 Differential Pressure Transmitter is a member of the comprehensive ST800 family, which includes absolute pressure transmitters (STA800), gauge pressure transmitters (STG800), flange mount pressure transmitters (STF800), and remote diaphragm seal transmitters (STR800), providing a complete pressure measurement solution for any process application-.

Model Configuration Example

A complete model number for the Honeywell STD825 Differential Pressure Transmitter follows the STD800 ordering code structure. For example, STD825-E1HS5AH-1-G-AHB-11C-A-20A0-0000 (with digital display) is configured with a -150 to 150 KPa range and 4-20 mA output-16. Another example, STD825-E1AC4AS, is a standard micro-differential pressure transmitter configuration-4. Contact your authorized Honeywell technical sales representative for detailed selection guidance based on your specific application requirements.