Honeywell STA700 Technical Information

SmartLine

Technical Information

STA700 SmartLine Absolute Pressure

Specification 34-ST-03-120, Jan 2021

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:

				URL			LRL	Min Span
	Model			mmHgA			mmHgA	mm HgA
				(mbarA)			(mbarA)	(mbarA)
STA725/72S			780 (1040)				0 (0)	50	(65.0)
	Model			psia			psi (barA)	psi (barA)
				(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

oConfigurable (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

oBuilt 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

oSmartLine communications protocols all meet the most current published standards for HART.

oAll 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

				Maximum	Stability	Reference
						Accuracy1,2
Model	URL	LRL	Min Span	Turndown	(% URL/Year
				Ratio	for 10 years)	% Span
						Standard
STA725	780 mmHgA	0.0 mmHgA (0.0 mbarA)	50 mmHgA (65.0 mbarA)	15:1
	(1040 mbarA)
STA745	500 psia (35 barA)	0.0 mmHgA (0.0 mbarA)	5 psia (0.35 barA)	100:1
STA72S	780 mmHgA	0.0 mmHgA (0.0 mbarA)	50 mmHgA (65.0 mbarA)	15:1	0.02	0.065
	(1040 mbarA)
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

Accuracy1,2

Combined Zero & Span

temperature Effect

(% of Span)

(% Span / 28oC(50oF)

Model

URL

Reference

A

B

C

D

E

Turndown

(see URL units)

STA725

780 mmHgA (1040 mbarA)

6.5:1

120 (160)

0.075

0.060

<![if ! IE]> <![endif]>Standard Accuracy

STA745

500 psia (35 barA)

16.7:1

30 (2.07)

0.075

0.015

STA74S

500 psia (35 barA)

16.7:1

30 (2.07)

0.075

0.020

STA72S

780 mmHgA (1040 mbarA)

4.3:1

0.005

0.060

180 (240)

0.075

0.120

STA77S

3000 psi (210 barA)

5:1

600 (41.37)

0.075

0.015

Turn Down Effect

Temp Effect

±[ + ]

≥

± [ + (

)]

± [ + (

)]

<

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		Rated Condition		Operative Limits		Transportation and
			Condition						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		See Figure 2.
	Pressure		Operate within specifications above 25 mmHgA (33 mbarA). Short term2 exposure to full
	STA725, 72S, 745, 74S, 77S		vacuum will not result in damage.
	Supply Voltage, Current,		10.8 to 42.4 Vdc at terminals (IS versions limited to 30 Vdc)
	and Load Resistance		0 to 1,440 ohms (as shown in Figure 3)
	Maximum Allowable		STA725, 72S = 780 mmHgA (1,040 mbarA)
	Working Pressure		STA745, 74S = 500 psia (35 barA)
	(MAWP) 3, 4
			STA77S = 3,000 psia (210 barA)

1LCD Display operating temperature -20 C to +70 C Storage temperature -30 C to 80 C.

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

3Units can withstand overpressure of 1.5 x MAWP without damage.

4Consult factory for MAWP of ST 700 transmitters with CRN approval.

5Silicone minimum temperature rating is -40 C (-40 F). CTFE minimum temperature rating is -30 C (-22 F).

1000

9

8

7

6

5

4

3

2

100

9

8

7

6

Measured 5

Pressure 4

mmHgA

3

25 mmHgA 2 (33.3 mbarA)

10

9

8

7

6

5

4

3

2

1.0

9

8

7

6

5

4

3

2

0.1

] [
] [	Operative
	Limit
	Rated Operating Area
	Silicone Oil
	200®
	CTFE

] [

NOTE: Short term exposure (2 hours at 70°C/158°F) to hard vacuum will not

result in damage.

] [

-40	-30	-20	0 40	50	60	70	80	90	100	110	120	ºC
-40	-22	-4	32 104	122	140	158	176	194	212	230	248	ºF

Meter Body Temperature

23065

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

STA700 Smart Pressure Transmitter	5

Figure 3 - Supply voltage and loop resistance chart & calculations

Performance Under Rated Conditions – All Models

	Parameter		Description
	Analog Output		Two-wire, 4 to 20 mA
	Digital Communications:		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		2.5 sec
	algorithms)
	Response Time		100ms
	(delay + time constant)
	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-2766
				STA700 Inline: 316L SS4, Hastelloy® C-2766
		Vent/Drain Valves & Plugs 1		STA700 Dual Head:316 SS4, Hastelloy® C-2762
				STA700 Inline: N/A
		Head Gaskets		STA700 Dual Head: Glass-filled PTFE standard. Viton® and graphite are optional.
				STA700 Inline: N/A
				STA700 Dual Head: Carbon Steel (Zinc plated) standard. Options include 316 SS,
		Meter Body Bolting		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

1Vent/Drains are sealed with Teflon®

2Hastelloy® C-276 or UNS N10276

4Supplied as 316 SS or as Grade CF8M, the casting equivalent of 316 SS.

5Carbon 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.

6Hastelloy® C-276 or UNS N10276. Supplied as indicated or as Grade CW12MW, the casting equivalent of Hastelloy® C-276