Honeywell ST 3000 User Manual

ST 3000 Smart Transmitter

Series 900 Remote Diaphragm Seals Models

STR93D 0 to 100 psid 0 to 7 bar
STR94G 0 to 500 psig 0 to 35 bar

In 1983, Honeywell introduced the first
Smart Pressure Transmitter― the ST
3000
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
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

Introduction

®

. In 1989, Honeywell launched

*

output,

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

34-ST-03-57
10/2002

Specification and

Model Selection

Guide

34-ST-03-57
Page 2

Description Features

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
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.

®

Configuration Toolkit provides an easy way to

• 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.

34-ST-03-57
Page 3

Specifications

Operating Conditions – All Models

Parameter

Ambient Temperature

Process Interface
Temperature

Humidity %RH
Overpressure (Flange

Rating) psi
bar

Vacuum Region, Minimum
Pressure - mmHg absolute
inH2O absolute

Supply Voltage, Current,
and Load Resistance

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

Reference
Condition

(at zero

static)

°C °F °C °F °C °F °C °F

25 ±1 77 ±2 -25 to 70 -13 to 158 -40 to 85 -40 to 185 -55 to 125 -67 to 257

25 ±1 77 ±2 See Figure 2 -55 to 125 -67 to 257

10 to 55 0 to 100 0 to 100 0 to 100

0
0

atmospheric
atmospheric

Voltage Range: 10.8 to 42.4 Vdc at terminals
Current Range: 3.0 to 21.8 mA
Load Resistance: 0 to 1440 ohms (as shown in Figure 3)

Rated Condition Operative Limits

750*

52*

750*

52*

See Figure 2

Transportation

and Storage

34-ST-03-57
Page 4

Maximum Pressure Limited
by Flange Rating of Seal

10000

9000
8000
7000
6000

5000
4000

3000

2000

1000

900

800
700
600
500

400

300
200

100

90
80
70
60

50
40
30

Pressure
(mmHgA)

Maximum Pressure Limited

by Flange Rating of Seal

20

10

-40

-100

52530

0

Silicone DC704
30 to 450°F

Silicone DC200

-40 to 350°F

CTFE

5 to 300°F

100

175 350

200 300 400

Process Temperature (Degrees F)

Special High Vacuum
Construction required.
Consult STC.

450

500

193

psig

1Atm

0

psig

-9

psig

-14
psig

10000

9000
8000
7000

6000
5000
4000

3000

NEOBEE M-20

Syltherm 800

-40 to 600°F

30 to 400°F

2000

1000

900

800
700
600
500

400
300
200

100

90
80
70
60

50
40
30

Pressure

20

(mmHgA)

10

-100

-40

52530

0

100

175 450

200 400 500

Process Temperature (Degrees F)

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

550

600

193

psig

90

psig

1Atm

0

psig

-9

psig

-14
psig

20335

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Page 5

1440

Loop

Resistance

(ohms)

1200

800

650

450

250

0 10.8 16.28 20.63 25 28.3 37.0 42.4

Operating Voltage (Vdc)

= 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.

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
bar

Minimum Span psi
bar

Turndown Ratio

Zero Elevation and Suppression

Accuracy (Reference – Includes

combined effects of linearity,
hysteresis, and repeatability)

• Accuracy includes residual error

after averaging successive
readings.

• For F

Combined Zero and Span
Temperature Effect per 28°C
(50°F) **

• Specification doubles for 2-inch

* 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.

OUNDATION Fieldbus use

Digital Mode specifications. For
HART use Analog Mode
specifications.

Sanitary Seals or for model with
only one remote seal

100 (Transmitter URL or maximum seal pressure rating, whichever is lower.)
7

0.9

0.063

110 to 1

No limit except minimum span within ±100% URL.

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

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

50 inH2O

±0.10 + 0.10

In Digital Mode: ±0.175% of calibrated span or upper range value (URV), whichever
is greater, terminal based.

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

±0.075 + 0.10

In Analog Mode: ±1.5% of span.
For URV below reference point (100 inH2O), effect equals:

±0.30 + 1.2

In Digital Mode: ±1.475% of span.
For URV below reference point (100 inH2O), effect equals:

±0.275 + 1.2



span inH2O



50 inH2O



span inH2O



100 inH2O



span inH2O



100 inH2O



span inH2O





or ±0.10 + 0.10





or ±0.075 + 0.10





or ±0.30 + 1.2





or ±0.275 + 1.2



125 mbar

()

span mbar

125 mbar

()

span mbar

250 mbar

()

span mbar

250 mbar

()

span mbar

in % span

in % span

in % span

in % span

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Page 6

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

Parameter Description

Upper Range Limit psi
bar

Minimum Span psi
bar

Turndown Ratio

Zero Elevation and Suppression

Accuracy (Reference – Includes

combined effects of linearity,
hysteresis, and repeatability)

• Accuracy includes residual error

after averaging successive
readings.

• For F

Combined Zero and Span
Temperature Effect per 28°C
(50°F) **

* 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.

OUNDATION Fieldbus use

Digital Mode specifications. For
HART use Analog Mode
specifications.

500
35

20

1.4

25 to 1

No limit except minimum span from absolute 0 (zero) to +100% URL.

In Analog Mode: ±0.10% of calibrated span or upper range value (URV), whichever is
greater, terminal based.

In Digital Mode: ±0.075% of calibrated span or upper range value (URV), whichever
is greater, terminal based.

In Analog Mode: ±2.2% of span.
For URV below reference point (50 psi), effect equals:

±0.2 + 2.0

In Digital Mode: ±2.175% of span

For URV below reference point (50 psi), effect equals:

±0.175 + 2.0

50 psi

()

span psi

()

span psi

50 psi

or ±0.2 + 2.0

or ±0.175 + 2.0

3.5 bar

()

span bar

()

in % span

3.5 bar

span bar

in % span

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

F

OUNDATION 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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Page 7

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

- Hazardous Areas

Pressure Equipment Directive
(97/23/EC)

* 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.

Approved as explosion proof and intrinsically safe for use in Class I, Division 1,
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.

The ST 3000 pressure transmitters listed in this Specification have no pressurized
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).

34-ST-03-57
Page 8

LP Side

Maximum level

H2

Fixed

ref. leg

Variable

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

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Page 9

Application Data

Liquid Level: Closed Tank

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

P

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

Min

= LRV when HP at bottom of

tank

= –URV when LP at bottom of

tank

P

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

Max

= 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

Max

Level

b

Min

Level

¥ Transmitter above datum

Max

Level

b

Min

Level

¥ Transmitter at datum

Max

Level

b

Min

Level

a

a

LP

HP

a

LP

HP

LP

HP

¥ Transmitter below datum

24253

Figure 5—Closed tank liquid level measurement distances