Honeywell STD725 STD720 STD730 STD735 STD770 STD775 Pressure Transmitter

• Calibration range accuracy up to 0.05%, with 0.04% optional
• Stability: 0.020% of span, maintained for 10 years
• Automatic static pressure and temperature compensation
• Range ratio of 100:1
• Fast response time of up to 100 ms
• Easy-to-use and intuitive display functions
• External zero, span, and configuration functions
• Comprehensive self-diagnostics
• Integrated dual-seal design based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 standards to ensure maximum safety
• Exceptional static pressure tolerance: 31.5 MPa
• Standard configuration fully meets SIL2/3 requirements
• Modular design
• Extendable warranty up to an additional 4 years

Note: All data provided by Honeywell laboratories

Description:
The SmartLine® series pressure transmitters are designed based on high-performance sensors. Each sensor effectively integrates multiple sensors, combining process pressure measurement with static pressure (for DP models) and temperature measurement used for temperature compensation, thereby achieving superior overall performance.
 

Display Head Options

Standard LCD Display Head:

• Modular (can be added or removed on-site)
• Supports HART protocol
• Adjustable to 0°, 90°, 180°, and 270° positions
• Measurement units include: Pa, kPa, MPa, kg/cm², Torr, ATM, i4H₂O, mH₂O, bar, mbar, inH₂O, inHg, FT H₂O, mmH₂O, mmHg, and psi
• Large screen display (9.95 mm high x 4.20 mm wide) with 2 lines and 8 characters
• Square root output and write protection indicator
• Display module features internal configuration buttons for setting and calibrating the transmitter via internal or external keys

Self-Diagnostics:

SmartLine® transmitters all offer digitally accessible diagnostics, which help provide advanced alarms for potential fault events. This significantly reduces planned downtime and lowers overall operating costs.

Configuration Tools

Integrated Internal or External Configuration Button Options:

Transmitters can be configured for all basic parameters using buttons integrated within the display module or external magnetic keys. The integrated external buttons meet all electrical and environmental requirements. For zero/span setting functions, external buttons can be used regardless of whether an LCD display head is selected.

Handheld Configuration:

SmartLine® transmitters support bidirectional communication and configuration between the operator and the transmitter. This is achieved through Honeywell's field configuration toolkit. Honeywell's field configuration toolkit allows for the on-site configuration of HART transmitters and can be used in intrinsically safe environments. All Honeywell transmitters are designed and tested to comply with the provided communication protocols and can be used with any certified handheld configurator.

Computer Configuration:

HART Field Device Manager (FDM) software and FDM Express can be used to manage the configuration of devices.

System Integration:

• SmartLine® communication protocols comply with the latest HART standards.
• All SmartLine® transmitter devices have been tested with Experion®, ensuring high compatibility.

Modular Design:

To help control maintenance and inventory costs, all ST700 transmitters feature a modular design, allowing for easy hardware replacements such as adding an LCD display head, replacing electronic modules, or even changing the transmitter diaphragm, without affecting overall performance or equipment safety certification. Each transmitter diaphragm is uniquely characterized and calibrated to provide exceptional performance across a wide range of static pressures and temperatures. Additionally, with Honeywell's modular interface design, electronic modules can be interchanged without compromising performance specifications.   

• Diaphragm Replacement
• Addable or Removable LCD Display Head*
• Replaceable Surge Protection Module (Terminals)*

*Except in explosion-proof environments, on-site replacements can be performed in any electrical environment (including intrinsically safe areas) without violating safety certification regulations.

Honeywell's innovative modular design reduces inventory requirements and maintenance costs without affecting transmitter performance.

Performance Under Rated Conditions

Material specification(See the selection guide for availability / restrictions for various models)

Parameter	Description
Membrane material	316L SS ,Hastelloy®C -2762,Monel®4003 , Ta3
Process interface material	316 SS4 , Carbon steel (galvanized)5, Hastelloy C -2766, Monel 4003
Exhaust / drain valve, and the plug1	316 SS4,Hastelloy C -2762
Sheet gasket	Standard equipped with glass-filled PTFE. Viton®And graphite optional.
Table body bolt	Standard with carbon steel (galvanized). Options include 316 SS, NACE A 286 SS, Monel K 500, Super dual-phase steel and B 7M.
Optional adapters and bolts	The conversion joint material includes 316 SS, Hastelloy®C-276. The bolt material of the conversion joint depends on the bolt material of the process interface clamp block. The standard converter O-ring material is made of glass-filled PTFE, Viton®And graphite optional.
mounting bracket	Plate or straight, angle, carbon steel (galvanized), 304SS, or 316SS.
Filler	DC®200 (silicone oil) or CTFE (fluorine oil)
hull	Pure polyester powder coated low copper (<0.4%) aluminum alloy, complying with NEMA 4X, IP66 / IP67 and NEMA 7 (explosion-proof). Stainless steel casing is optional.
install	Installation is possible almost anywhere using a standard mounting bracket. The bracket is designed to be mounted over 2 inch (50 mm) vertical or horizontal piping. See Figure 3.
procedural interface	1 / 4 "-NPT or 1 / 2" -NPT (meet DIN requirements).
lead	Accept the max 16 AWG (1.5 mm diameter).
size	See Figure 3.
net weight	3.8 Kg (with aluminum alloy enclosure)

 

1.The exhaust / drain port adopts Teflon®seal.

2.Hastelloy®And C-276 or UNS N 10276.

3.Special materials consulting factory

4. 316 SS or CF8M, 316 SS equivalent.

5.Carbon steel pellet galvanized, is not recommended for wading services because of hydrogen transfer. For this application, use the 316 stainless steel

clips.

6.Hastelloy®And C-276 or UNS N 10276. Provided as indicated, or provide CW 12MW, Hastelloy®C-276 equivalent casting.
 

Dimension

Power Supply Voltage and Circuit Resistance Diagram and Calculation