Honeywell STD870 Differential Pressure Transmitter

Honeywell STD870 Differential Pressure Transmitter

Product Overview

The Honeywell STD870 Differential Pressure Transmitter is the highest-range member of the SmartLine® ST800 family, engineered around advanced piezoresistive sensor technology for high-pressure differential measurement applications. The Honeywell STD870 Differential Pressure Transmitter integrates differential pressure sensing with on-chip static pressure and temperature compensation, delivering exceptional measurement accuracy and long-term stability across the most demanding high-pressure process environments.

The Honeywell STD870 Differential Pressure Transmitter is specifically designed for critical process loops and high-value applications requiring a 3,000 psi differential pressure range with superior resolution. As the flagship model in the ST800 series—which also includes STD810 (10 inH₂O), STD815 (100 inH₂O), STD820 (400 inH₂O), and STD830 (100 psi)—the STD870 serves applications where no other SmartLine transmitter can reach.

The SmartLine family has been fully tested and complies with Experion® PKS standards, ensuring the highest level of compatibility assurance and seamless integration capabilities. The Honeywell STD870 Differential Pressure Transmitter easily meets the most demanding application requirements for pressure measurement in industrial process environments.

Performance Specifications

Pressure Ranges and Limits

The Honeywell STD870 Differential Pressure Transmitter features a differential pressure range of -3,000 to 3,000 psi with an upper range limit (URL) of 3,000 psi and a lower range limit (LRL) of -3,000 psi. The minimum span for the Honeywell STD870 Differential Pressure Transmitter is 30 psi, making it suitable for applications requiring high differential pressure resolution in the high-pressure segment.-10-1

The Honeywell STD870 Differential Pressure Transmitter offers a turndown ratio of 100:1, providing rangeability that reduces inventory requirements and allows a single device to cover multiple measurement scenarios. The static pressure capability for the Honeywell STD870 Differential Pressure Transmitter is rated up to 4,500 psi standard, with an optional upgrade to 6,000 psi depending on configuration.-10

Accuracy and Long-Term Stability

The Honeywell STD870 Differential Pressure Transmitter delivers reference accuracy up to 0.035% of calibrated span as standard, with an optional 0.025% accuracy available for critical applications requiring the highest measurement precision. This exceptional performance makes the Honeywell STD870 Differential Pressure Transmitter ideal for custody transfer and high-value process control applications.-10

Long-term stability for the Honeywell STD870 Differential Pressure Transmitter is rated at 0.01% of URL per year, sustained over a period of 15 years of continuous operation. The Honeywell STD870 Differential Pressure Transmitter also offers an optional 15-year warranty for applications requiring extended reliability assurance.-10

Dynamic Response

The Honeywell STD870 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.-4-20

Automatic Compensation

Automatic static pressure and temperature compensation is embedded directly into the sensor chip architecture, ensuring that the Honeywell STD870 Differential Pressure Transmitter maintains accuracy even under fluctuating process and environmental conditions. The piezoresistive sensor technology integrated into the Honeywell STD870 Differential Pressure Transmitter combines multiple sensor elements on a single chip, allowing real-time correction of errors induced by static pressure and temperature variations.-4

Electrical Specifications and Communication

Output and Communication Protocols

The Honeywell STD870 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

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 STD870 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.-10-4

Dual/Triple Calibration

The Honeywell STD870 Differential Pressure Transmitter offers dual/triple calibration options for HART and Fieldbus versions, enabling flexible configuration across different control system interfaces.-20

Materials of Construction

Wetted Materials

The Honeywell STD870 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 STD870 Differential Pressure Transmitter include glass-filled PTFE as standard, with Viton and graphite available as optional upgrades.-10

Enclosure and Housing

The Honeywell STD870 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. A stainless steel housing option is available for applications requiring enhanced durability and marine-grade protection.

Environmental Specifications

The Honeywell STD870 Differential Pressure Transmitter is designed for reliable operation in harsh industrial environments across the following parameters:

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

Storage Temperature: -55°C to +120°C

Ingress Protection: NEMA 4X, IP66/IP67 ratings

Relative Humidity: 0 to 100% RH

These environmental specifications ensure that the Honeywell STD870 Differential Pressure Transmitter maintains performance integrity in outdoor installations, washdown areas, extreme climate conditions, and hazardous area classifications.-10

Diagnostics and Safety Features

On-Board Diagnostics

The Honeywell STD870 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

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

Safety Design and Certifications

The Honeywell STD870 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.-4

The Honeywell STD870 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.-20

Agency Approvals

The Honeywell STD870 Differential Pressure Transmitter carries multiple international certifications for hazardous area installations, including FM, CSA, ATEX, IECEx, NEPSI, KOSHA, EAC, CCoE, UATR, SAEx, and INMETRO. Marine approvals from ABS, BV, DNV, KR, and LR are also available for shipboard and offshore installations.-10

Display and Configuration

The Honeywell STD870 Differential Pressure Transmitter features a modular LCD display that can be added or removed in the field without affecting performance or certification status. The display supports 0°, 90°, 180°, and 270° position adjustments for optimal viewing in any mounting orientation. The basic alphanumeric LCD display supports a comprehensive range of measurement units including Pa, kPa, MPa, kg/cm², torr, atm, inH₂O, mH₂O, bar, mbar, inHg, ftH₂O, mmH₂O, mmHg, and psi.-4

External zero, span, and configuration capability is provided via externally accessible buttons, enabling field adjustments without opening the enclosure. The advanced graphics LCD display option offers up to eight configurable screens with large PV display with bar graph or trend graph formats.-4

Physical Specifications

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

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

Static pressure limit: 4,500 psi (standard), 6,000 psi (optional)

Maximum allowable working pressure: Up to 4,500 psi (310 bar) standard, 6,000 psi (420 bar) optional (model dependent)-10

Application Suitability

The Honeywell STD870 Differential Pressure Transmitter is ideally suited for a wide spectrum of measurement applications requiring high-pressure differential measurement with high accuracy and reliability. The 3,000 psi differential pressure range with 30 psi minimum span makes the Honeywell STD870 Differential Pressure Transmitter particularly well-suited for:

Custody transfer applications requiring high accuracy measurement in high-pressure lines

Energy and material balance calculations for high-pressure processes

Flow measurement with primary flow elements (orifices, venturis, nozzles) in high-pressure gas and liquid services

Hydrostatic tank gauging in high-pressure closed vessels

Filter monitoring and differential pressure across high-pressure filtration systems

Pump and compressor performance monitoring in high-pressure applications

Heat exchanger and condenser differential pressure monitoring in high-pressure steam systems