Honeywell STD725, STD735, STD775 Technical Information

SmartLine

Technical Information

STD700 SmartLine Differential Pressure Specification 34-ST-03-121, Jan 2021

Introduction

Part of the SmartLine® family of products, the STD700 models are suitable for monitoring, control and data acquisition featuring piezoresistive sensor technology. By combining pressure sensing with on chip temperature compensation capabilities STD700 offers high accuracy, stability and performance over a wide range of application pressures and temperatures. The SmartLine family is also fully tested and compliant with Experion® PKS providing the highest level of compatibility assurance and integration capabilities. SmartLine easily meets the most demanding application needs for pressure measurement applications.

Best in Class Features:

o Accuracies up to 0.05% of span o Stability up to 0.020% of URL per year for 10 years o Automatic static pressure & temperature compensation o Rangeability up to 100:1 o Response times as fast as 100ms o Easy to use and intuitive display capabilities o Intuitive External Zero, Span and configuration

capability

o Comprehensive on-board diagnostic capabilities o Integral Dual Seal design for highest safety based

on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0

o World class overpressure protection o Full compliance to SIL 2/3 requirements. o Modular design characteristics o Available with additional 4-year warranty

Communications/Output Options:

o HART ® (version 7.0)

Figure 1 – STD725/735/775 Differential Pressure Transmitters feature field-proven piezoresistive

sensor technology

Span & Range Limits:

Model

URL

inH2O

(mbar)

LRL

inH2O

(mbar)

Min Span

inH2O

(mbar)

STD725

400 (1000)

-400 (1000)

4 (10)

Model

psi (bar)

STD735

100 (7.0)

-100 (-7.0)

1 (0.07)

STD775

3000 (210)

-100 (-7.0)

30 (2.1)

2 STD700 Smart Pressure Transmitter

Description

The SmartLine family pressure transmitters are designed around a high performance piezo-resistive sensor. This one sensor actually integrates multiple sensors linking process pressure measurement with on-board static pressure (DP Models) and temperature compensation measurements.

Indication/Display Option

Standard LCD Display Features

o Modular (may be added or removed in the field) o Supports HART protocol variant o 0, 90,180, & 270 degree position adjustments

o Configurable (HART only) and standard (Pa, KPa,

MPa, KGcm2, Torr, ATM, inH2O, mH2O, bar, mbar, inHG, FTH2O, mmH2O, mm HG, & psi) measurement units.

o Supports Flow engineering units o 2 Lines 6 digits PV (9.95H x 4.20W mm) 8 Characters o Square root output indication (√) o Write protect Indication o Built in Basic Device Configuration through Internal or

External Buttons – Range/Engineering Unit/Loop Test /Loop Calibration/Zero /Span Setting

o Multiple language capability (EN, RU)

Diagnostics

SmartLine transmitters all offer digitally accessible diagnostics which aid in providing advanced warning of possible failure events minimizing unplanned shutdowns, providing lower overall operational costs

System Integration

o SmartLine communications protocols all meet the most

current published standards for HART.

o All ST 700 units are Experion tested to provide the

highest level of compatibility assurance

Configuration Tools

External Two Button Configuration Option

Suitable for all electrical and environmental requirements, SmartLine offers the ability to configure the transmitter and display, for all basic parameters, via two externally accessible buttons when a display option is selected. Zero/span capabilities are also optionally available via two external buttons with or without selection of the display option.

Internal Two Button Configuration Option

The Standard display has two buttons that can be used for Basic configuration such as re ranging, PV Engineering unit setting, Zero/Span settings, Loop testing and calibration functions.

Hand Held Configuration

SmartLine transmitters feature two-way communication and configuration capability between the operator and the transmitter. All Honeywell transmitters are designed and tested for compliance with the offered communication protocols and are designed to operate with any Standards compliant handheld configuration device.

Modular Design

To help contain maintenance & inventory costs, all ST 700

transmitters are modular in design supporting the user’s

ability to replace meter bodies, standard displays or electronic modules without affecting overall performance. Each meter body is uniquely characterized to provide intolerance performance over a wide range of application variations in temperature and pressure.

Modular Features

 Meter body replacement  Add or remove standard displays  Add or remove lightning protection (terminal

connection)

With no performance effects, Honeywell’s unique modularity

results in lower inventory needs and lower overall operating costs.

STD700 Smart Pressure Transmitter 3

Performance Specifications

Reference Accuracy (conformance to +/-3 Sigma)

Table 1

Model

URL

LRL

Min Span

Maximum

Turndown

Ratio

Stability (% URL/Year for 10 years)

Reference

Accuracy

1,2

(% Span) Standard

STD725

400 in H2O (1000 mbar)

-400 in H2O (-1000 mbar)

4 in H2O (10 mbar)

100:1

0.020

0.05

STD735

100 psi (7.0 bar)

-100 psi (-7.0 bar)

1 psi (0.07 bar)

100:1

0.020

STD775

3000 psi (210 bar)

-100 psi (-7.0 bar)

30 psi (2.1bar)

100:1

0.020

Zero and span may be set anywhere within the listed (URL/LRL) range limits

Accuracy, Temperature and Static Pressure Effects:

(Conformance to +/-3)

Table 2

Accuracy

1,2

(% of Span)

Combined Zero &

Span temperature

Effect

(% Span / 28oC

(50oF))

Combined Zero &

Span Static Line

Pressure Effect

(% Span / 1000psi)

Model

URL

Reference Turndown

(see URL

units)

Standard

Accuracy

STD725

400 in H2O

(1000 mbar)

16:1

0.005

0.045 25 (62,5)

0.050

0.025

0.100

0.020

STD735

100 psi (7.0 bar)

4:1

25 (1.75)

0.070

0.015

0.100

0.020

STD775

3000 psi (210 bar)

10:1

300 (21)

0.070

0.015

0.100

0.020

Turn Down Effect

Temp Effect

Static Effect

Total Performance (% of Span):

Total Performance = +/- √(Accuracy)

+ (Temp Effect)2+ (Static Line Pressure Effect)2

Total Performance Examples: (standard accuracy, 5:1 Turndown, up to 50 oF shift & up to 1000 psi Static

Pressure) STD725 @ 80 inH2O: 0.270% of span STD735 @ 20 psi: 0.255 % of span STD775 @ 600 psi: 0.252 % of span

Typical Calibration Frequency:

Calibration verification is recommended every two (2) years

Notes:

1. Terminal Based Accuracy – Includes combined effects of linearity, hysteresis and repeatability. Analog output adds 0.006% of span

2. For zero based spans and reference conditions of: 25oC (77oF), 0 psig static pressure, 10 to 55% RH and 316SS barrier diaphragm.

4 STD700 Smart Pressure Transmitter

Operating Conditions – All Models

Parameter

Reference

Condition

Rated Condition

Operative Limits

Transportation and

Storage

C

F

C

F

C

F

C

F

Ambient Temperature1

25±1

77±2

-40 to 85

-40 to 185

-40 to 85

-40 to 185

-55 to 120

-67 to 248

Meter Body Temperature

25±1

77±2

-40 to 110

-40 to 230

-40 to 125

-40 to 257

-55 to 120

-67 to 248

Humidity %RH

10 to 55

0 to 100

Vac. Region – Min. Pressure mmHg absolute

inH2O absolute

Atmospheric Atmospheric

25 13

2 (short term ) 2 1 (short term ) 2

Supply Voltage Load Resistance

10.8 to 42.4 Vdc at terminals (IS versions limited to 30 Vdc)

0 to 1,440 ohms (as shown in Figure 2)

Maximum Allowable Working Pressure (MAWP)

3,4

(ST 700 products are rated to Maximum Allowable Working

Pressure. MAWP depends on

Approval Agency and

transmitter materials of

construction.)

4,500 psi (310 bar)

LCD Display operating temperature -20C to +70C Storage temperature -30C to 80C.

Short term equals 2 hours at 70C (158F)

MAWP applies for temperatures -40 to 125C. Static Pressure Limit is de-rated to 3,000 psi for -26C to -40C. for all models. Use of

graphite o-rings de-rates transmitter to 3,625 psi. Use of 1/2:” process adaptors with graphite o-rings de-rates transmitter to 3,000 psi.

Consult factory for MAWP of ST 700 transmitters with CRN approval.

Silicone minimum temperature rating is -40C (-40F). CTFE minimum temperature rating is -30C (-22F).

Figure 2 - Supply voltage and loop resistance chart & calculations

STD700 Smart Pressure Transmitter 5

Performance Under Rated Conditions – All Models

Parameter

Description

Analog Output Digital Communications:

Two-wire, 4 to 20 mA HART 7 protocol

HART Output Failure Modes

Honeywell Standard: NAMUR NE 43 Compliance:

Normal Limits: 3.8 – 20.8 mA 3.8 – 20.5

mA Failure Mode: ≤ 3.6 mA and ≥ 21.0 mA ≤ 3.6 mA and ≥

21.0 mA

Supply Voltage Effect

0.005% span per volt.

Transmitter Turn on Time (includes power up & test algorithms)

2.5 sec.

Response Time (delay + time constant)

100mS

Damping Time Constant

Adjustable from 0 to 32 seconds in 0.1 increments. Default: 0.50 seconds

Vibration Effect

Less than +/- 0.1% of URL w/o damping Per IEC60770-1 field or pipeline, high vibration level (10-2000Hz: 0.21

displacement/3g max acceleration)

Electromagnetic Compatibility

IEC 61326-3-1

Lightning Protection Option

Leakage Current: 10uA max @ 42.4VDC 93C Impulse rating: 8/20uS 5000A (>10 strikes) 10000A (1 strike min.)

10/1000uS 200A (> 300 strikes)

Materials Specifications (see model selection guide for availability/restrictions with various models)

Parameter

Description

Barrier Diaphragms Material

316L SS, Hastelloy® C-2762

Process Head Material

316 SS4, Carbon Steel (Zinc-plated) 5, Hastelloy® C-2766

Vent/Drain Valves & Plugs

316 SS4, Hastelloy® C-2762

Head Gaskets

Glass-filled PTFE standard. Viton® and graphite are optional.

Meter Body Bolting

Carbon Steel (Zinc plated) standard. Options include 316 SS, NACE A286 SS bolts and Super Duplex.

Optional Adapter Flange and Bolts

Adapter Flange materials include 316 SS, Hastelloy® C-276 and Super-Duplex. Bolt material for flanges is dependent on process head bolts material chosen. Standard adaptor seal material is glass-filled PTFE. Viton and graphite are optional.

Mounting Bracket

2” Pipe, Carbon Steel (Zinc-plated), 304 Stainless Steel or 316 Stainless Steel

Fill Fluid

Silicone 200 , CTFE

Electronic Housing

Pure Polyester Powder Coated Low Copper (<0.4%)-Aluminum. Meets NEMA 4X, IP66, & IP67. All stainless steel housing is optional.

Mounting

Can be mounted in virtually any position using the standard mounting bracket. Bracket is designed to mount on 2-inch (50 mm) vertical or horizontal pipe. See Figure 3.

Process Connections

1/4- NPT or 1/2- NPT with adapter (meets DIN requirements)

Wiring

Accepts up to 16 AWG (1.5 mm diameter).

Dimensions

See Figure 3.

Net Weight

8.3 pounds (3.8 Kg) with Aluminum Housing.

Vent/Drains are sealed with Teflon®

Hastelloy

C-276 or UNS N10276

Supplied as 316 SS or as Grade CF8M, the casting equivalent of 316 SS.

Carbon Steel heads are zinc-plated and not recommended for water service due to hydrogen migration. For that service, use 316 stainless steel wetted

Process Heads.

Hastelloy C-276 or UNS N10276. Supplied as indicated or as Grade CW12MW, the casting equivalent of Hastelloy C-276

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