Honeywell ST 3000 User Manual

ST 3000 Smart Transmitter				34-ST-03-57
				10/2002
Series 900 Remote Diaphragm Seals Models				Specification and
STR93D	0 to 100 psid	0 to 7 bar
				Model Selection
STR94G	0 to 500 psig	0 to 35 bar
				Guide

Introduction

In 1983, Honeywell introduced the first Smart Pressure Transmitter― the ST 3000®. In 1989, Honeywell launched the first all digital, bi-directional protocol for smart field devices. Today, its

ST 3000 Series 900 Remote Seal Transmitters continue to bring proven “smart” technology to a wide spectrum of pressure measurement applications. For applications in which the transmitter must be mounted remotely from the process, Honeywell offers the remote seal line of gauge, absolute and differential pressure transmitters. Typical applications include level measurement in pressurized vessels in the chemical and hydrocarbon processing industries. A second application is flow measurement for slurries and high viscosity fluids in the chemical industry. Honeywell remote seal transmitters are available with secondary fill fluids for corrosive or high temperature process fluids

All ST 3000 transmitters can provide a 4-20 mA output, Honeywell Digitally Enhanced (DE) output, HART* output, or FOUNDATION™ Fieldbus output. When digitally integrated with Honeywell’s Process Knowledge System™, EXPERION PKS™,

ST 3000 instruments provide a more accurate process variable as well as advanced diagnostics.

Honeywell’s cost-effective ST 3000 S900 transmitters lead the industry in reliability and stability:

•Stability = +/-0.01% per year

•Reliability = 470 years MTBF

Figure 1—Series 900 Remote Seal Pressure Transmitters feature proven piezoresistive sensor technology.

The devices provide comprehensive self-diagnostics to help users maintain high uptime, meet regulatory requirements, and attain high quality standards. S900 transmitters allow smart performance at analog prices. Accurate, reliable and stable, Series 900 transmitters offer greater turndown ratio than conventional transmitters.

"Honeywell transmitters operating in the digital mode using Honeywell's Digitally Enhanced (DE) protocol make diagnostics available right at the control system's human interface. Equally important, transmitter status information is continuously displayed to alert the operator immediately of a fault condition. Because the process variable (PV) status transmission precedes the PV value, we are guaranteed that a bad PV is not used in a control algorithm. In addition, bi-directional communication provides for remote transmitter configuration directly from the human interface, enabling management of the complete loop.”

Maureen Atchison, DuPont

Site Electrical & Instrumentation Leader

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Description

The ST 3000 transmitter can replace any 4 to 20 mA output transmitter in use today and operates over a standard two-wire system.

The measuring means is a piezoresistive sensor, which actually contains three sensors in one. It contains a differential pressure sensor, a temperature sensor, and a static pressure sensor.

Microprocessor-based electronics provide higher span-turndown ratio, improved temperature and pressure compensation, and improved accuracy.

The transmitter’s meter body and electronics housing resist shock, vibration, corrosion, and moisture. The electronics housing contains a compartment for the single-board electronics, which is isolated from an integral junction box. The single-board electronics is replaceable and interchangeable with any other ST 3000 Series 100 or Series 900 model transmitter.

Like other Honeywell transmitters, the ST 3000 features two-way communication between the operator and the transmitter through our Smart Field Configurator (SFC). You can connect the SFC anywhere that you can access the transmitter signal lines.

The SCT 3000 Smartline® Configuration Toolkit provides an easy way to configure instruments using a personal computer. The toolkit enables configuration of devices before shipping or installation. The SCT 3000 can operate in the offline mode to configure an unlimited number of devices. The database can then be loaded downline during commissioning.

Features

•Choice of linear or square root output conformity is a simple configuration selection.

•Direct digital integration with Experion PKS and other control systems provides local measurement accuracy to the system level without adding typical A/D and D/A converter inaccuracies.

•Unique piezoresistive sensor automatically compensates input for temperature and static pressure.Added “smart” features include configuring lower and upper range values, simulating accurate analog output, and selecting preprogrammed engineering units for display.

•Smart transmitter capabilities with local or remote interfacing means significant manpower efficiency improvements in commissioning, start-up, and ongoing maintenance functions.

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Specifications

Operating Conditions – All Models

Parameter

Reference

Rated Condition

Operative Limits

Transportation

Condition

and Storage

(at zero

static)

°C

°F

°C

°F

°C

°F

°C

°F

Ambient Temperature

25 ±1

77 ±2

-25 to 70

-13 to 158

-40 to 85

-40 to 185

-55 to 125

-67 to 257

Process Interface

25 ±1

77 ±2

See Figure 2

-55 to 125

-67 to 257

Temperature

Humidity

%RH

10 to 55

0 to 100

0 to 100

0 to 100

Overpressure (Flange

Rating)

psi

0

750*

750*

bar

0

52*

52*

Vacuum Region,

Minimum

Pressure - mmHg absolute

atmospheric

See Figure 2

inH2O absolute

atmospheric

Supply Voltage, Current,

Voltage Range:

10.8 to 42.4 Vdc at terminals

and Load Resistance

Current Range:

3.0 to 21.8 mA

Load Resistance: 0 to 1440 ohms (as shown in Figure 3)

* Or Seal rating, whichever is lower. See Model Selection Guide for Seal rating.

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Maximum Pressure Limited
by Flange Rating of Seal
10000									193
9000									psig
8000
7000				Silicone DC704
6000
5000					30 to 450°F
4000
3000
2000				Silicone DC200
					-40 to 350°F
1000
900									1Atm
800
700					CTFE				0
600									psig
500
400					5 to 300°F				-9
300
									psig
200
100 90
80							Special High Vacuum
70
60							Construction required.
50
40							Consult STC.
30
Pressure20
(mmHgA)									-14
10
								450	psig
-40	5	25	30		175		350
				100					500
-100	0				200	300	400
Maximum Pressure Limited				Process Temperature (Degrees F)
by Flange Rating of Seal
10000									193
9000									psig
8000							Syltherm 800
7000
6000							-40 to 600°F		90
5000
									psig
4000
3000					NEOBEE M-20
2000					30 to 400°F
1000900									1Atm
800
700									0
600									psig
500
400
300									-9
200									psig
100 90
80
70
60
50
40
30
Pressure20
(mmHgA)									-14
10
								550	psig
-40	5	25	30		175		450
				100					600
-100	0				200	400	500

Process Temperature (Degrees F)

20335

Figure 2—ST 3000 Remote Seals operable limits for pressure versus temperature

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	1440
	1200
Loop	800
Resistance
(ohms)	650
	450
	250
	0	10.8	16.28 20.63 25	28.3	37.0	42.4

=Operating Area

NOTE: A minimum of 250 0hms of loop resistance is necessary to support communications. Loop resistance equals barrier resistance plus wire resistance plus receiver resistance. Also 45 volt operation is permitted if not an intrinsically safe installation.

Operating Voltage (Vdc)

21012

Figure 3—Supply voltage and loop resistance chart

Performance Under Rated Conditions * - Model STR93D (0 to 100 psi/7 bar)

Parameter

Description

Upper Range Limit

psi

100 (Transmitter URL or maximum seal pressure rating, whichever is lower.)

bar

7

Minimum Span

psi

0.9

bar

0.063

Turndown Ratio

110 to 1

Zero Elevation and Suppression

No limit except minimum span within ±100% URL.

Accuracy (Reference – Includes

In Analog Mode: ±0.20% of calibrated span or upper range value (URV), whichever is

combined effects of linearity,

greater, terminal based.

hysteresis, and repeatability)

For URV below reference point (50 inH2O), accuracy equals:

• Accuracy includes residual error

±0.10 + 0.10

50 inH2O

or ±0.10 + 0.10

125 mbar

in % span

after averaging successive

span inH2O

(span mbar)

readings.

• For FOUNDATION Fieldbus use

In Digital Mode: ±0.175% of calibrated span or upper range value (URV), whichever

is greater, terminal based.

Digital Mode specifications. For

For URV below reference point (50 inH2O), accuracy equals:

HART use Analog Mode

specifications.

50 inH2O

(

125 mbar

) in % span

±0.075 + 0.10

or ±0.075 + 0.10

span inH2O

span mbar

Combined Zero and Span

In Analog Mode: ±1.5% of span.

Temperature Effect per 28°C

For URV below reference point (100 inH2O), effect equals:

(50°F) **

100 inH2O

250 mbar

• Specification doubles for 2-inch

±0.30 + 1.2

or ±0.30 + 1.2

in % span

span inH2O

(span mbar)

Sanitary Seals or for model with

only one remote seal

In Digital Mode: ±1.475% of span.

For URV below reference point (100 inH2O), effect equals:

100 inH2O

250 mbar

±0.275 + 1.2

or ±0.275 + 1.2 (

) in % span

span inH2O

span mbar

*Performance specifications are based on reference conditions of 25°C (77°F), zero (0) static pressure, 10 to 55% RH, and 316L Stainless Steel barrier diaphragm.

**Apply 1.5 times factor to capillary lengths greater than 10 feet.

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Performance Under Rated Conditions * - Models STR94G (0 to 500 psi/35 bar)

Parameter						Description
Upper Range Limit	psi	500
	bar	35
Minimum Span	psi	20
	bar	1.4
Turndown Ratio		25 to 1
Zero Elevation and Suppression		No limit except minimum span from absolute 0 (zero) to +100% URL.
Accuracy (Reference – Includes		In Analog Mode: ±0.10% of calibrated span or upper range value (URV), whichever is
combined effects of linearity,		greater, terminal based.
hysteresis, and repeatability)		In Digital Mode: ±0.075% of calibrated span or upper range value (URV), whichever
• Accuracy includes residual error		is greater, terminal based.
after averaging successive
readings.
• For FOUNDATION Fieldbus use
Digital Mode specifications. For
HART use Analog Mode
specifications.
Combined Zero and Span		In Analog Mode: ±2.2% of span.
Temperature Effect per 28°C		For URV below reference point (50 psi), effect equals:
(50°F) **			50 psi					3.5 bar
		±0.2 + 2.0 (			) or ±0.2 + 2.0		(			) in % span
			span psi					span bar
		In Digital Mode: ±2.175% of span
		For URV below reference point (50 psi), effect equals:
				50 psi					3.5 bar
		±0.175 + 2.0 (				) or ±0.175 + 2.0 (					) in % span
				span psi					span bar

*Performance specifications are based on reference conditions of 25°C (77°F), zero (0) static pressure, 10 to 55% RH, and 316L Stainless Steel barrier diaphragm.

**Apply 1.5 times factor to capillary lengths greater than 10 feet.

Performance Under Rated Conditions - General for all Models

Parameter	Description
Output (two-wire)	Analog 4 to 20 mA or DE digital communications mode. Options available for
	FOUNDATION Fieldbus and HART protocols.
Supply Voltage Effect	0.005% span per volt.
Damping Time Constant	Adjustable from 0 to 32 seconds digital damping.
CE Conformity (Europe)	89/336/EEC, Electromagnetic Compatibility (EMC) Directive.

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	Physical and Approval Bodies
	Parameter	Description
	Process Interface	See Model Selection Guide for Material Options for desired Seal Type.
	Seal Barrier Diaphragm	316L Stainless Steel, Monel, Hastelloy C, Tantalum
	Seal Gasket Materials	Klinger C-4401 (non-asbestos)
		Grafoil
	Mounting Bracket	Carbon Steel (zinc-plated) or Stainless Steel angle bracket or Carbon Steel flat
		bracket available.
	Fill Fluid (Meter Body)	Silicone (DC 200)	S.G. @ 25°C (77°F) = 0.94
		CTFE (Chlorotrifluoroethylene)	S.G. @ 25°C (77°F) = 1.89
	Fill Fluid (Secondary)*	Silicone (DC 200)	S.G. @ 25°C (77°F) = 0.94
		CTFE (Chlorotrifluoroethylene)	S.G. @ 25°C (77°F) = 1.89
		Silicone (DC 704)	S.G. @ 25°C (77°F) = 1.07
		Syltherm 800	S.G. @ 25°C (77°F) = 0.90
		NEOBEE M-20	S.G. @ 25°C (77°F) = 0.93
	Electronics Housing	Epoxy-Polyester hybrid paint. Low-copper aluminum alloy. Meets NEMA 4X
		(watertight) and NEMA 7 (explosion proof)
	Capillary Tubing**	Armored Stainless Steel or PVC Coated Armored Stainless Steel. Length: 5, 10,
		15, 20, 25 and 35 feet (1.5, 3, 4.6, 6.1, 7.5 and 10.7m). A 2” (51 millimeter) S.S.
		close-coupled nipple is also available. See Model Selection Guide.
	Wiring	Accepts up to 16 AWG (1.5 mm diameter)
	Mounting	See Figure 4.
	Dimensions	See Figures 7 and 8 for transmitter dimensions. See Model Selection Guide for
		Seal dimensions
	Net Weight	Transmitter: 4.1 Kg (9 lbs). Total weight is dependent on seal type and capillary
		length.
	Approval Bodies	Approved as explosion proof and intrinsically safe for use in Class I, Division 1,
	- Hazardous Areas	Groups A, B, C, D locations, and nonincendive for Class I, Division 2, Groups A,
		B, C, D locations. Approved EEx ia IIC T4, T5, T6 and EEx d IIC T5, T6 per ATEX
		standards. See attached Model Selection Guide for options.
	Pressure Equipment Directive	The ST 3000 pressure transmitters listed in this Specification have no pressurized
	(97/23/EC)	internal volume or have a pressurized internal volume rated less than 1,000 bar
		(14,500 psig) and/or have a maximum volume of less than 0.1 liter. Therefore,
		these transmitters are either; not subject to the essential requirements of the
		directive 97/23/EC (PED, Annex 1) and shall not have the CE mark, or the
		manufacturer has the free choice of a module when the CE mark is required for
		pressures > 200 bar (2,900 psig).

*See Figure 2 for Fill Fluid temperature limits.

**2-inch Sanitary Seals are limited to 15 ft. (4.6 m) capillary length.

NOTE: Pressure transmitters that are part of safety equipment for the protection of piping (systems) or vessel(s) from exceeding allowable pressure limits, (equipment with safety functions in accordance with Pressure Equipment Directive 97/23/EC article 1, 2.1.3), require separate examination.

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LP Side

Maximum level

H2
Fixed	Variable
ref. leg
	Head
	H1

Minimum level

.

HP Side

NOTE: Lower flange seal should not be mounted over 22 feet below the transmitter for silicone fill fluid (11 feet for CTFE fill fluid) with tank at one atmosphere. The combination of tank vacuum and high pressure capillary head effect should not exceed 9 psi vacuum (300 mmHg absolute).

Consult Honeywell for installation of STR93D

Figure 4—Typical mounting arrangement for ST 3000 Transmitter with Remote Diaphragm Seals

Application Data

Liquid Level: Closed Tank

Determine the minimum and maximum pressure differentials to be measured (Figure 5).

PMin = (SGp x a) - (SGf x d)

=LRV when HP at bottom of tank

=–URV when LP at bottom of tank

PMax = (SGp x b) - (SGf x d)

=URV when HP at bottom of tank

=–LRV when LP at bottom of tank

Where:

minimum level = 4mA

maximum level = 20 mA

a = distance between bottom tap and minimum level

b = distance between bottom tap and maximum level

d = distance between taps

SGf = Specific Gravity of capillary

fill fluid (See Page 6 for values.)

SGp = Specific Gravity of process fluid

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Max

LP

Level

Min

b

HP

Level

a

¥ Transmitter above datum

Max		LP
Level
	b
Min		HP
	a
Level

¥ Transmitter at datum

Max

LP

Level

b

Min

Level

a HP

¥ Transmitter below datum

24253

Figure 5—Closed tank liquid level measurement distances