Honeywell STA700 Technical Information

SmartLine

STA700 SmartLine Absolute Pressure
Specification 34-ST-03-120, Jan 2021

Technical Information

Introduction

Part of the SmartLine® family of products, the STA700 and
STA70L are suitable for monitoring, control and data
acquisition featuring piezoresistive sensor technology
combining pressure sensing with on chip temperature
compensation capabilities providing 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:

 Accuracies up to 0.065% of span
 Stability up to 0.020% of URL per year for 10 years
 Automatic temperature compensation
 Rangeability up to 100:1
 Response times as fast as 100ms
 Easy to use and intuitive display capabilities
 Intuitive external zero, span, & configuration capability
 Comprehensive on-board diagnostic capabilities
 Integral Dual Seal design for safety based on

ANSI/NFPA 70-202 and ANSI/ISA 12.27.0

 Full compliance to SIL 2/3 requirements
 Modular design characters
 Available with additional 4–year warranty

Communications/Output Options:

 HART ® (version 7.0)

Figure 1 – STA700 InLine and Dual Head Absolute

Pressure Transmitters feature field-proven

piezoresistive sensor technology

Span & Range Limits:

Model

URL
mmHgA
(mbarA)

LRL

mmHgA
(mbarA)

Min Span

mm HgA

(mbarA)

STA725/72S

780 (1040)

0 (0)

50 (65.0)

Model

psia

(barA)

psi (barA)

psi (barA)

STA745/74S

500 (35)

0 (0)

5 (.35)

STA77S

3000 (210)

0 (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 2 Lines 6 digits PV (9.95H x 4.20W mm) 8 Characters
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 capabilities (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 option for zero/span setting

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.

Personal Computer Configuration

Field Device Manager (FDM) Software and FDM Express are
also available for managing HART device configurations.

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.

STA700 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

STA725

780 mmHgA

(1040 mbarA)

0.0 mmHgA (0.0 mbarA)

50 mmHgA (65.0 mbarA)

15:1

0.02

0.065

STA745

500 psia (35 barA)

0.0 mmHgA (0.0 mbarA)

5 psia (0.35 barA)

100:1

STA72S

780 mmHgA

(1040 mbarA)

0.0 mmHgA (0.0 mbarA)

50 mmHgA (65.0 mbarA)

15:1

STA74S

500 psia (35 barA)

0.0 mmHgA (0.0 mbarA)

5 psia (0.35 barA)

100:1

STA77S

3000 psi (210 barA)

0.0 mmHgA (0.0 mbarA)

30 psia (2.1 barA)

100:1

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

Accuracy at Specified Span and Temperature: (Conformance to +/-3 Sigma)

Table 2

Accuracy

1,2

(% of Span)

Combined Zero & Span

temperature Effect

(% Span / 28oC(50oF)

Model

URL

Reference
Turndown

A

B

C

(see URL units)

D

E

Standard

Accuracy

STA725

780 mmHgA (1040 mbarA)

6.5:1

0.005

0.060

120 (160)

0.075

0.060

STA745

500 psia (35 barA)

16.7:1

30 (2.07)

0.075

0.015

STA72S

780 mmHgA (1040 mbarA)

4.3:1

180 (240)

0.075

0.120

STA74S

500 psia (35 barA)

16.7:1

30 (2.07)

0.075

0.020

STA77S

3000 psi (210 barA)

5:1

600 (41.37)

0.075

0.015

Turn Down Effect

Temp Effect

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Total Performance (% of Span):

Total Performance Calculation: = +/- √ (Accuracy)2 + (Temperature Effect)2

Total Performance Examples (for comparison): (standard accuracy, 5:1 Turndown, +/-50 oF (28oC) shift)

STA725 @ 156 mmHgA: 0.381% of span STA72S @ 156 mmHgA: 0.679% of span
STA745 @ 100 psia: 0.163% of span STA74S @ 100 psia: 0.187% of span
STA77S @ 600 psia: 0.163% 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), 10 to 55% RH, and 316 Stainless Steel barrier diaphragm.

4 STA700 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

STA725 / STA72S

25±1

77±2

See Figure 2

See Figure 2

-55 to 125

-67 to 257

STA745, 74S, 77S

25±1

77±2

-40 to 110

-40 to 230

-40 to 125

-40 to 257

-55 to 125

-67 to 257

Humidity %RH

10 to 55

0 to 100

0 to 100

0 to 100

Vacuum Region - Minimum
Pressure

STA725, 72S, 745, 74S, 77S

See Figure 2.
Operate within specifications above 25 mmHgA (33 mbarA). Short term2 exposure to full
vacuum will not result in damage.

Supply Voltage, Current,
and 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 3)

Maximum Allowable
Working Pressure
(MAWP) 3, 4

STA725, 72S = 780 mmHgA (1,040 mbarA)
STA745, 74S = 500 psia (35 barA)
STA77S = 3,000 psia (210 barA)

1

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

2

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

3

Units can withstand overpressure of 1.5 x MAWP without damage.

4

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

5

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

Figure 2 - Measured pressure versus meter body temperature chart for ST 700 Dual Head and Inline

models

-40

-30

-20

40

50

60

70

80

90

100

110

120

ºC

ºF

-40

-22

-4

104

122

140

158

176

194

212

230

248

0.1

1.0

10

100

1000

2

3 4 5 6 7 8 9 2 3 4 5

6

7 8 9

2 3 4 5 6

7 8 9

2

3 4 5 6 7 8 9

] [

] [

] [

Meter Body Temperature

] [

NOTE:

Short term exposure (2 hours at

70°C/158°F) to hard vacuum will not

result in damage.

0

32

Measured

Pressure

mmHgA

Rated Operating Area

Silicone Oil

200®

Operative

Limit

CTFE

25 mmHgA

(33.3 mbarA)

23065

STA700 Smart Pressure Transmitter 5

Figure 3 - Supply voltage and loop resistance chart & calculations

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% of 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 Value: 0.5 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

Meets IEC61326-3-1

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)

6 STA700 Smart Pressure Transmitter

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

Parameter

Description

Barrier Diaphragms Material

STA7x5 Dual Head: 316L SS, Hastelloy® C-2762
STA7xS Inline: 316L SS, Hastelloy C-2762

Process Head Material

STA700 Dual Head: Carbon Steel (Zinc Plated)5, 316 SS4, Hastelloy® C-276

6

STA700 Inline: 316L SS4, Hastelloy® C-2766

Vent/Drain Valves & Plugs

1

STA700 Dual Head:316 SS4, Hastelloy® C-276

2

STA700 Inline: N/A

Head Gaskets

STA700 Dual Head: Glass-filled PTFE standard. Viton® and graphite are optional.
STA700 Inline: N/A

Meter Body Bolting

STA700 Dual Head: Carbon Steel (Zinc plated) standard. Options include 316 SS,

NACE A286 SS bolts and nuts or NACE A286 SS bolts nuts and Super Duplex

STA700 Inline: N/A

Mounting Bracket

Carbon Steel (Zinc-plated) or 304 or 316 Stainless Steel. See Figures 4 & 5

Fill Fluid

Silicone 200, CTFE (Chlorotrifluoroethylene)

Electronic Housing

Pure Polyester Powder Coated Low Copper (<0.4%)-Aluminum. Meets NEMA 4X,
IP66, IP67 and NEMA 7 (explosion proof). All stainless steel housing is optional.

Process Connections

STA700 Dual Head: ½ -inch NPT (female)
STA700 Inline: ½ -inch NPT (female), ½ -inch NPT male, 9/16 Aminco. G½ -B Male

Thread

Wiring

Accepts up to 16 AWG (1.5 mm diameter).

Dimensions

See Figure 4 and Figure 5

Net Weight

STA700 Dual Head: 8.3 pounds (3.8 Kg). STA700 InLine: 3.6 pounds (1.6 Kg) with

Aluminum Housing

1

Vent/Drains are sealed with Teflon®

2

Hastelloy

®

C-276 or UNS N10276

4

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

5

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.

6

Hastelloy

®

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