Thermo Scientific Sarasota SG901 User Manual

Sarasota SG901

Specific Gravity Analyzer

User Guide
P/N HB-SG901

Revision E

Part of Thermo Fisher Scientific

Sarasota SG901

Specific Gravity Analyzer

User Guide
P/N HB-SG901

Revision E

© 2012 Thermo Fisher Scientific Inc. All rights reserved.

“Ni-Span C” is a registered trademark of the Special Metals Corporation.
“HART” is a registered trademark of the HART Communication Foundation.

All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.

Thermo Fisher Scientific (Thermo Fisher) makes every effort to ensure the accuracy and completeness of this
manual. However, we cannot be responsible for errors, omissions, or any loss of data as the result of errors or
omissions. Thermo Fisher reserves the right to make changes to the manual or improvements to the product at
any time without notice.

The material in the manual is proprietary and cannot be reproduced in any form without expressed written
consent from Thermo Fisher.

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Revision History

Revision Level Date Comments

A 03-2009 Initial release (ECO 6849).

B 06-2010 Revised per ECO 7413.

C 08-2010 Revised per ECO 7494.

D 01-2011 Revised per ECO 7628.

E 01-2012 Revised per ECO 7874.

Thermo Fisher Scientific Sarasota SG901 User Guide v

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Contents

Chapter 1

Chapter 2

Chapter 3

Explanation of Symbols ..................................................................................... ix

Warnings .............................................................................................................. xi

Control of Substances Hazardous to Health ........................................... xi

Electrical Safety ...................................................................................... xi

Product Overview ............................................................................................. 1-1

Introduction ........................................................................................ 1-1

Configurations ................................................................................. 1-1

Basic System .................................................................................. 1-2

Dry Gas System ............................................................................ 1-2

Wet Gas System ............................................................................ 1-2

Operation ........................................................................................... 1-2

Installation ......................................................................................................... 2-1

Mechanical Considerations ................................................................. 2-1

Cabinet Support Structure ............................................................... 2-1

Weatherproof Cabinet ...................................................................... 2-1

Pipelines/Sample Tubing ................................................................. 2-1

Safety ............................................................................................... 2-2

Electrical Considerations ..................................................................... 2-2

Cable Specification ........................................................................... 2-2

Safe Areas ......................................................................................... 2-2

Hazardous Areas ............................................................................... 2-2

Electrical Installation ........................................................................... 2-3

Protective Earth Grounding ............................................................. 2-3

Safety Disconnecting Means Requirements ...................................... 2-3

Frequency Output Option ............................................................... 2-4

Headmount Option ......................................................................... 2-4

Electric Heater ................................................................................. 2-4

Thermo Fisher Scientific Sarasota SG901 User Guide vii

Commissioning .................................................................................................. 3-1

General ............................................................................................... 3-1

Initial Power Up ................................................................................. 3-1

Frequency Output Option ............................................................... 3-1

Headmount Option ......................................................................... 3-1

Sample System ................................................................................. 3-2

Density Converter ............................................................................ 3-2

Contents

Chapter 4

Chapter 5

Chapter 6

Chapter 7

Appendix A

Appendix B

Appendix C

Appendix D

Appendix E

Appendix F

Validation ............................................................................................................ 4-1

General ............................................................................................... 4-1

Validation with an Injection Sample ................................................... 4-2

Validation with a Process Gas Sample ................................................. 4-3

Calibration .......................................................................................................... 5-1

Field Adjustments ............................................................................... 5-1

SG Definition & Calculation .............................................................. 5-1

Adjustment ......................................................................................... 5-2

Correction Calculation ..................................................................... 5-2

Maintenance ...................................................................................................... 6-1

Preventive Maintenance ...................................................................... 6-1

Thermometry Check ........................................................................ 6-2

Electric Heater Check ...................................................................... 6-2

Pressure Transmitter Check ............................................................. 6-2

Filter Condition ............................................................................... 6-3

Density Sensor Check ...................................................................... 6-3

Troubleshooting & Service ............................................................................. 7-1

Fault Diagnosis ................................................................................... 7-1

Troubleshooting Sarasota SG901 / CM515 Density Systems .............. 7-2

Contact Information ........................................................................... 7-5

Warranty ............................................................................................. 7-6

Ordering Information ....................................................................................... A-1

Specifications ................................................................................................... B-1

Drawings ............................................................................................................ C-1

Health & Safety Clearance Form ................................................................... D-1

Equations............................................................................................................ E-1

Configuration Considerations when Using Sarasota CM515 ................... F-1

Purpose ............................................................................................... F-1

Equations ............................................................................................ F-1

Critical Temperature and Critical Pressure .......................................... F-3

General Configuration (Metric) for SG Measurement ......................... F-5

Index .......................................................................................................... INDEX-1

viii Sarasota SG901 User Guide Thermo Fisher Scientific

Explanation of Symbols

The following symbols are used in this guide or on the equipment:

Caution: Risk of danger. Refer to user guide.

Warning: Electrical shock hazard.

Warning: Hot surface hazard.

Protective ground

Thermo Fisher Scientific Sarasota SG901 User Guide ix

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Warnings

Control of

Substances

Hazardous to

y

 Know the safety precautions and first aid instructions before you use a

hazardous substance.

 Read the label on the container in which the substance is supplied.

Health

Electrical Safet

 Read the data sheet applicable to the substance.

 Obey the local orders and instructions.

Warning Remove all power from the unit before making any connections.
Electrocution can result if power is present. 

Warning Ensure the power supply is isolated. Take suitable precautions to
prevent reinstatement of power while working on the system. 

Caution The equipment can be impaired if equipment is not used in a
manner specified by the manufacturer. 

Thermo Fisher Scientific Sarasota SG901 User Guide xi

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Chapter 1

Configurations

Product Overview

Introduction

Thermo Fisher Scientific’s Sarasota SG901 specific gravity analyzer is
recommended in applications where specific gravity (SG), molecular weight
(MW), or density at reference conditions (D@ref) can be used in the plant
instead of density at-line conditions. In applications where the process gas
is too dirty, too hot, or at too high a pressure, the Sarasota SG901 allows
for pre-conditioning of the process stream so a measurement can be made.

Typical applications include:

 Energy determination

 Blending control

 Standard volume control

 Fuel gas monitoring

 Process efficiency

 SG for density determination at other parts of the process

The Sarasota SG901 is available in three standard configurations, or
systems, which may be selected based on the condition of the sample
stream. They are the basic system, the wet gas system, and the dry gas
system.

Thermo Fisher Scientific Sarasota SG901 User Guide 1-1

Note that all three systems may have a steam or electric heater mounted
within the enclosure so that the sample gas can be maintained above its
dew point. They are also available with the frequency output or headmount
option (see “Operation” for more on these options).

Product Overview

ystem

ystem

Wet Gas System

Operation

Basic S

Dry Gas S

The basic system is ideal for applications in which the sample stream is
already conditioned for other instruments. The analyzer is used in
conjunction with an existing gas conditioning system that provides a clean,
dry sample at a pressure below 4 bar A (58 psi A). This system consists of a
small area dry particle filter, density meter assembly (with integral PT100
temperature element), pressure transmitter, and flow control valve. All
components are interconnected by 1/4-inch (6 mm) stainless steel tubing
and are housed in a weatherproof cabinet.

Refer to drawings SG91-6002 and SG91-6005 in the drawing appendix.

The dry gas system is ideal for applications where the gas is always above its
dew point, but the sample is not filtered and is above 4.5 bar A. It is similar
to the basic system, but it offers a complete package solution to many
applications. The small area dry particle filter is replaced by a larger area
filter capable of handling unfiltered product. An inlet pressure regulator,
safety vent, calibration point, rotameter, and isolation valves are also
included.

Refer to drawing SG91-6001 and SG91-6004 in the drawing appendix.

Operation

The wet gas system is similar to the dry gas system, but it allows for the
measurement of gases with significant moisture content. In addition to all
of the dry gas system components, a coalescing filter with auto drain and
isolation valve is fitted. Note that the wet gas system is designed to protect
the system from occasional upsets when condensate may appear in the
stream. If condensate is always in the stream other methods should be used
to ensure the stream is above its dew point.

Refer to drawings SG91-6000 and SG91-6003 in the drawing appendix.

The operation described here is for an instrument fitted with optional
components.

The gas sample passes through a high pressure isolating valve, pressure
regulator, filter assembly, and isolating valve. Both isolating valves are used
during maintenance activities.

Downstream of the isolation valve, immediately before the density meter,
the gas pressure is measured by a precision pressure transmitter. The gas
then flows through the density meter assembly, the rotameter, and the flow
control valve.

1-2 Sarasota SG901 User Guide Thermo Fisher Scientific

A calibration tee, fitted to the inlet pipe of the density meter assembly,
allows for tapping to the calibration valve. The calibration tee facilitates
purging and accurate calibration of the pressure transmitter and SG system.

Product Overview

Operation

With the frequency output option, signal outputs from the transducers are
fed to a Thermo Scientific Sarasota density converter, which calculates the
density (measured), D@ref, SG, and MW of the gas and provides
corresponding 4–20 mA current outputs. All variables and calculated values
can be displayed on the front panel of the converter. Alternatively, with the
headmount version, the Thermo Scientific Sarasota HME900 field
mounted density converter provides a direct HARTcompatible output.

Thermo Fisher Scientific Sarasota SG901 User Guide 1-3

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Chapter 2

Mechanical

Considerations

binet Support

Structure

Weatherproof

ample

Installation

Note Installation must be carried out in accordance with local site

requirements and regulations. 

Refer to the drawings in the drawing appendix for this chapter.

Ca

Cabinet

Pipelines/S

Tubing

The structure the equipment cabinet will be mounted to shall support four
times the weight of the equipment. Refer to the specification appendix for
unit weight.

The weatherproof cabinet should be mounted securely to a vertical surface
with the process connections at the bottom of the unit. Refer to the
dimensional drawings for mounting dimensions.

The gas inlet should be connected to a suitable tapping on the sample
stream via 1/4-inch bulkhead unions. Inlet piping should be kept as short
as possible to minimize system response time.

The pressure available at the inlet to the Sarasota SG901 system should be
at least 0.4 bar (6 psi) above the control pressure set in the system to ensure
regulation.

Where the ambient temperature can drop below the dew point of the
sample gas, the lines should be insulated or heated.

If the sample stream is at high pressure, a pressure reduction system may be
used to decrease the standard volume in the sample line.

Thermo Fisher Scientific Sarasota SG901 User Guide 2-1

Installation

Electrical

Considerations

Safe Areas

Hazardous Areas

Electrical Considerations

Safety

Cable Specification

Ideally, the exhaust should be vented at near atmospheric pressure. The
normal method is to exhaust the system to the flare header. If this is not
possible then the system should be exhausted at a pressure of at least 0.4 bar
(6 psi) below the control pressure in the analyzer system.

It may be required to feed the safety vent outlet, where fitted, to a disposal
system or returned to the gas line for environmental reasons.

Note It is the user’s responsibility to ensure that local requirements are
met. 

The cable specification for the Sarasota SG901 analyzer is:

BS5308 part 1 : 1986 : type 2

Polyethylene insulated, bedded, single wire armored, PVC sheathed,
five twisted pairs with individual screens, core size 0.5 mm².

This cable is suitable for underground installation.

Maximum distance for transmission of signal is 1 km.

Other cable types may be used, but they must meet requirements for IS
installation.

When the sample gas is non-flammable and the area is non-hazardous,
standard electrical precautions regarding signal cables should be taken in
order to minimize problems associated with electrical noise.

In hazardous areas, appropriate care must be taken to meet local system
requirements and the certification requirements for the Sarasota SG901
analyzer.

2-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Installation

Electrical

Protective Earth

Grounding

Safety

Disconnecting

Means

Requirements

Electrical Installation

Installation

Warning Electrical installation must be done by qualified individuals in

accordance with local site requirements and regulations. 

In general, any mains power required for heaters should be segregated from
signal and instrument wiring. Where the signaling is protected by an IS
concept, the IS wiring must be segregated from signal wires protected by
explosion or flameproof concepts.

The SG901 enclosure provides an internal safety ground lug for safety
protective earth grounding. The safety ground lug is used to connect the
heater AC power input ground line.

As a permanently connected equipment, the SG901 analyzer requires a
switch or circuit breaker as the means for disconnection. The analyzer
requires 120 Vac or 240 Vac, 700 W for its smart heater. The customer
needs to prepare the switch or circuit breaker according to the following
requirements:

1. A switch or circuit breaker must be included in the building

installation.

2. It must be in close proximity to the equipment (SG901) and within

easy reach of the operator.

3. It must be marked as the disconnecting device for this equipment

(SG901).

Thermo Fisher Scientific Sarasota SG901 User Guide 2-3

Installation

Frequency Output

Option

Heater

Electrical Installation

Option

The connections to the Sarasota SG901 analyzer with the frequency output
option include the following:

 Terminals 1 & 2, density meter (24 Vdc) 2-wire current pulse

 Terminals 2, 3, 4, & 5, PT100 4-wire (W, X, Y, & Z)

 Terminals 7 & 8, PTX transmitter input (4–20 mA)

These connections should be made to the Thermo Scientific density
converter using four shielded pairs 0.5–1.5 mm square connection cable
installed into the terminal box.

The screen of the instrument cable should not be connected to the Sarasota
SG901 analyzer.

Headmount

Electric

The Sarasota SG901 analyzer with the headmount option has a built-in
density converter. Connections are available as listed below.

 Terminals 1 & 2, density meter +24V

 Terminals 3 & 4, HART signal terminals (4–20 mA)

 Terminals 5 & 6, PTX supply (24V)

These connections should be made to the built-in density converter using
three shielded pairs 0.5–1.5 mm square connection cable installed into the
terminal box.

The electric heater voltage is 110 V or 220 V, 500 W maximum.
Connection should be made with a suitable connecting cable via a suitable
gland. The gland should mate with the fitting on the terminal box.

Note The heater should be connected via a suitable isolator to allow power
to be removed from the heater if the enclosure is to be left open for any
significant time. The connection box and connections are indicated in
Figure 2–1. 

2-4 Sarasota SG901 User Guide Thermo Fisher Scientific

The terminal box is suitable for use in hazardous areas and holds European
and North American approvals. The installer should ensure that the box is
clean and undamaged with correct types and wire sizes 2–4 mm2 (14–11
AWG). Overall sheath should be 8.5–14 mm.

Connections for the frequency output and headmount versions are shown
in the following diagrams.

Installation

Electrical Installation

Figure 2–1. Wiring for optional heater junction box, frequency output version

Thermo Fisher Scientific Sarasota SG901 User Guide 2-5

Figure 2–2. Wiring for optional heater junction box, headmount version

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Chapter 3

utput

Option

Commissioning

Warning Refer to the warnings section in the beginning of this manual. 

Warning Ensure all local safety rules that apply to this equipment are

followed and any permits necessary for the work have been issued. Also
ensure obligations under the Health and Safety at Work Act are met. 

General

Initial Power Up

Frequency O

Option

Headmount

All installation details and wiring should be checked against the
recommended methods in this guide and local codes of practice. If zener
barriers or isolators are fitted, ensure they are correctly installed and
grounded / earthed where appropriate.

The Sarasota SG901 with frequency output will have the density meter,
PT100, and pressure transmitter powered when power is applied to the
density converter. Apply power to the unit. It should be possible to read a
period from the density meter, temperature, and pressure. If these readings
are not present, remove power from the density converter and check the
wiring. If no wiring fault can be found, go to Chapter 7 for
troubleshooting.

The headmount version of the Sarasota SG901 will have power to each
loop provided from a DCS or remote DC power supply.

Note The HART signaling requires the supply to be connected to it and
will sink 4–20 mA. It does NOT supply current to a passive device. 

Thermo Fisher Scientific Sarasota SG901 User Guide 3-1

Commissioning

Sample System

Density Converter

Initial Power Up

Ensure that operating pressure, temperature, and gas flow available are
within specifications.

Note The sample take-out point may have an initial regulator to decrease
pressure in the sample line and increase the response of the system. If this is
the case, it should be set in the 5–10 bar G range, depending on the sample
line length to ensure 5 bar A at the input to the Sarasota SG901 system. 

For the basic system, the operating pressure should be within the range of
the pressure transmitter (0.3–3.45 bar) and at least 0.4 bar above the
exhaust pressure. Ideally, the pressure should be close to 4 bar to minimize
pressure measurement errors.

For the dry and wet gas systems, the inlet pressure should be set according
to any factory acceptance test (FAT) documents, or close to 4 bar A to
minimize measurement errors. However, in some cases, the pressure may
deliberately set lower than this for operational reasons.

Note Read any FAT records fully. 

Set the flow rate so that the minimum flow rate meets the sample delay
requirements of the overall system. The higher the flow rate, the lower the
delay time. However, as the flow is increased, the waste exhaust gas volume
increases. A flow rate of 5 L/min is suggested as an initial value.

For details on commissioning the selected density converter, refer to the
user guide provided with it. Generally, the density converter should be set
to perform following tasks:

 Calculate density with VOS correction (VibDim) calibration constants

 Calculate density at reference conditions

 Calculate SG / MW

3-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Chapter 4

Validation

Warning Refer to the warnings section in the beginning of this manual. 

General

A calibration tee is provided to facilitate purging of the density meter with
a known gas for calibration purposes. Alternatively, if the internal regulator
is to be checked, the inlet should be disconnected and the purging gas
supply connected in its place. In either case, the pressure measured at the
calibration tee with no flow should agree with the 4–20 mA signal from the
pressure transmitter.

To validate the system, it is necessary to either introduce a sample gas of
known characteristics into the system or take a sample of gas from the
system for laboratory analysis. If a sample is taken from the process stream
for laboratory analysis, it will be representative of the stream. If a test gas
mixture is introduced into the instrument, the mixture used should be
representative of the measured process stream. The reason for this follows.

The Sarasota SG901 system measures density, temperature, and pressure. It
then calculates density at reference conditions. The calculation of line
density and density at reference conditions require values of isentropic
exponent (specific heat at constant pressure / specific heat at constant
volume) and one of the following: Az and Bz (for the Thermo Scientific
Sarasota HME900) or critical temperature and critical pressure (for the
Thermo Scientific Sarasota CM515). These constants are calculated based
on the expected average gas constituents. If the validation gases are not
representative of the process gas, the constants will be in error and the
system may not operate to specification. If the validation gas is not
representative of the process, it may be required to change the gas constants
before validation and then return the constants to the operational values
after the test.

Thermo Fisher Scientific Sarasota SG901 User Guide 4-1

Refer to Figure 4–1 for the valves used in system validation.

Validation

Validation with

an Injection

Validation with an Injection Sample

Figure 4–1. System validation flow diagram

Sample

Follow these steps to validate the system using an injection sample.

1. Close valves 1 and 2, and open valve 4.

2. Invert the validation gas sample cylinder several times to ensure a good

mix.

3. Connect the gas cylinder to the validation gas input via a pressure

regulator set to the same pressure as the Sarasota SG901 regulator.

4. Allow the sample to flow at approximately 5 L/min until the reading

from the density converter is stable. Note the SG or MW reading, and
compare it to the certified SG or MW. The error between the system
and the certified value should be within the sum of the uncertainties of
the validation gas and the Sarasota SG901. If the error is unacceptable,
go to Chapter 7 for troubleshooting.

5. After validation, close the validation cylinder valve and valve 3. Open

valves 2 and 1.

4-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Validation with a

Process Gas

Sample

Validation

Validation with a Process Gas Sample

The process gas sample can be taken out of the validation gas input.
However, as the sample is taken, the reading from the system will become
unstable. Alternatively, arrangements may be made to leave a sample tee
and suitable valve at the sample output (Flow Out).

To take the sample using a sample bladder and the validation gas input
connection, follow these steps.

1. Read the SG of the gas in the system.

2. Crack the validation gas input valve (valve 3), and allow gas to flow

through the connection for a suitable time to ensure the validation gas
tube is full of representative gas.

3. Connect the bladder, and open the valve to fill it.

4. Close the valve. Isolate and remove the bladder.

5. Allow the system to stabilize until it reaches the reading that was

present before the sample was taken. If the process gas has changed
during the sample and the unit does not return to its previous reading,
use an average reading or take the sample again. The sample should be
passed to the laboratory for analysis. If the error is unacceptable, go to

Chapter 7 for troubleshooting.

Thermo Fisher Scientific Sarasota SG901 User Guide 4-3

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Field

Adjustments

&

alculation

,

't

)'tt(

K2

't

)'tt(

'd

0

0

0

0

0m











−

×+×

−

×=ρ

.

ta

RVIBDIM

- 1 D0 =

d

2

0





























×

×

′

.

LPISENEX

= a

m

2

1















ρ

××

Chapter 5

Calibration

Adjustment may be done in the field. However, it is important the
thermometry is known to be good before any other adjustment is made.

Adjustment is carried out if the applied reference (standard) does not
provide the expected output result. The allowable error of the system will
be the sum of the uncertainty of the supplied sample and the acceptable
error of the Sarasota SG901 system. For instance, if the acceptable error of
the system at the operating point is 0.2% and the uncertainty of the sample
is 0.5%, the acceptable error band is ± 0.7%.

SG Definition

C

There are two figures given for SG. Ideal SG is the ratio of the MW of the
sample and the MW of air and real SG. Real SG is the ratio of the densities
of the sample gas to the density of air at the same reference conditions.

The density meter measures density at actual conditions. To do this, we use
the following equation:

where

).PP(PRESCO)TT(TEMPCO0T't

−×+−×+=

calcal0

The inputs to the equations are temperature, pressure, period (from the
density meter) and isentropic exponent (Cp/Cv). Where the gas matrix is
changing the average, isentropic exponent should be used. There is an error
associated with the isentropic exponent; however, a relatively large error in
isentropic exponent will only make a small error in density. The isentropic
exponent will usually be in the range of 1.2–1.4.

Thermo Fisher Scientific Sarasota SG901 User Guide 5-1

Calibration

Correction

,

ZrefTrefP

ZTefPr

m

c

××

×××ρ

=ρ

Adjustment

From line density, we calculate density at the chosen reference conditions.
Where density at reference conditions is calculated as:

where Z and Zref are the compressibility (divergence from ideal gas
equations) at measurement and reference conditions. Z and Zref are
calculated using the Redlich Kwong equation of state which uses two
constants: Az and Bz (Sarasota HC900 and Sarasota CM200) or critical
temperature and critical pressure (Sarasota CM515). These constants can
be calculated from tables based on gas mixture, or in cases where the
mixture is hydrocarbon, from a built-in fit (Az and Bz from MW).

SG is then calculated by dividing the sample reference density by the
density of air at the same conditions.

A full set of equations is included in Appendix E.

Adjustment

Calculation

System adjustments should only be made after a number of samples have
been taken to establish an average error. Failure to do this or attempts to
adjust the system based on one reading or sample may actually increase the
error. To make an adjustment:

1. Ensure the pressure and temperature readings are an acceptable

accuracy.

2. Set the density correction factor (DCF) to 1 and the density offset

(Doff) to 0.

3. Take a series of samples and synchronous readings of SG. Have the

samples analyzed and calculate the average error.

Assuming the thermometry, pressure measurement, supercompressibility
calculations, and isentropic exponent are operating correctly, the
adjustment can be made using the DCF or the Doff. Either option is
acceptable, but the Doff should give better results as long as the span of the
system is relatively small.

5-2 Sarasota SG901 User Guide Thermo Fisher Scientific

To calculate the Doff, you will need to know the following synchronous
data: average SG error and average line density during the test.

Calibration

Adjustment

Example

Real SG = 0.88, Displayed SG = 0.8, error = -10%

Line density = 3.84 kg/m3

Density correction = (Density * (Error %/ 100))

= (3.84 * 0.1) = 0.384 kg/m3

Change the Doff to 0.384.

Note that if the DCF is used, then

DCF = (1 – (Error % / 100))

In the example, DCF would equal 1.1.

If the applied SG is calculated from MW, compressibility should be taken
into account.

Table 5–1 gives compressibility for gases at the specified conditions. Table
5–2 provides the compressibility at reference conditions (Zref) of 0°C and

1.01325 bar A. This can be used to estimate the compressibility (Z and
Zref) in the density at reference conditions equation (Ref – 1.01325 bar A
and 0°C).

Table 5–1. Gas Compressibility at specified conditions

Gas Pressure 25°C 30°C 35°C 40°C 45°C

2 bar A 0.9965 0.9967 0.9969 0.9971 0.9973

C1 3 bar A 0.9948 0.9951 0.9954 0.9957 0.9959

4 bar A 0.9931 0.9935 0.9939 0.9943 0.9946

2 bar A 0.9849 0.9856 0.9864 0.9870 0.9877

C2 3 bar A 0.9772 0.9783 0.9794 0.9805 0.9814

4 bar A 0.9694 0.9710 0.9725 0.9738 0.9751

2 bar A 0.9677 0.9694 0.9710 0.9725 0.9739

C3 3 bar A 0.9508 0.9535 0.9559 0.9582 0.9603

4 bar A 0.9333 0.9370 0.9404 0.9435 0.9465

2 bar A 0.9383 0.9420 0.9483 0.9483 0.9512

C4 3 bar A Liquid Liquid 0.9153 0.9203 0.9248

4 bar A Liquid Liquid Liquid Liquid 0.8968

2 bar A Liquid Liquid Liquid Liquid Liquid

C5 3 bar A Liquid Liquid Liquid Liquid Liquid

Thermo Fisher Scientific Sarasota SG901 User Guide 5-3

4 bar A Liquid Liquid Liquid Liquid Liquid

Calibration

Adjustment

Gas Pressure 25°C 30°C 35°C 40°C 45°C

2 bar A 1.0012 1.0012 1.0012 1.0012 1.0012

H2 3 bar A 1.0018 1.0018 1.0018 1.0018 1.0018

4 bar A 1.0024 1.0024 1.0024 1.0024 1.0024

2 bar A 0.9898 0.9904 0.9909 0.9913 0.9918

CO2 3 bar A 0.9847 0.9855 0.9863 0.9870 0.9877

4 bar A 0.9796 0.9807 0.9817 0.9827 0.9836

2 bar A 0.9955 0.9997 0.9998 0.9998 0.9999

N2 3 bar A 0.9933 0.9996 0.9997 0.9998 0.9999

4 bar A 0.9911 0.9994 0.9996 0.9997 0.9998

Table 5–2. Gas compressibility at reference conditions (0°C and 1.01325 bar A)

C1 C2 C3 H2 CO2 N2

0.9976 0.9986 0.9588 1.0006 0.9937 0.9995

5-4 Sarasota SG901 User Guide Thermo Fisher Scientific

Preventive

Maintenance

Chapter 6

Maintenance

In general, the Sarasota SG901 analyzer is low maintenance. This section
provides schedules for preventive maintenance.

Caution Maintenance should be performed only by qualified personnel. 

Preventive maintenance should be done at least once yearly (more often if
the process stream is particularly dirty). Preventive maintenance consists of
the checking the following:

 Thermometry

 Functionality of heaters, if fitted

 Functionality of the pressure transmitter / density converter

 Filter condition

 Density sensor

To perform maintenance, you will need a clean air supply, a pressure test
gauge or calibrator, an accurate thermometer (0.1°C), and other normal
tools.

If the density meter requires cleaning, you will also need a spool spanner,
suitable solvent, lint-free wipes, and acetone final solvent wash.

Thermo Fisher Scientific Sarasota SG901 User Guide 6-1

Maintenance

Thermometry Check

Heater

Pressure

Preventive Maintenance

1. Open the analyzer enclosure, and connect the check thermometer to

the sample tube at the entrance or exit of the density meter.

2. Close the door, and allow the system to stabilize.

3. Read the system temperature and the thermometer. The system

temperature should be within ± 0.2°C (0.36°F) of the thermometer. If
the error is significantly outside this range, the density converter may
require calibration. If you have a system with the frequency output
option, refer to the manual supplied with the density converter for
calibration instructions. If you have a system with the headmount
option, the thermometry of the built-in converter cannot be calibrated
on site. Contact Thermo Fisher.

Electric

Check

Transmitter Check

If an electric heater is fitted, it should maintain the temperature within the
enclosure at ± 2°C (3.6°F) of the set control point. By monitoring the
density meter temperature you should read the cabinet temperature. It
should be stable (± 2°C/3.6°F).

The surface temperature of the heater is redundantly limited electronically
and by a safety fuse at the heat source.

The pressure transmitter / density converter can be checked online by
connecting a test gauge to the gas validation input connection. Note that
the gauge should be absolute and have an accuracy of 0.1% or better.

To check the system, connect the test gauge (or pressure transducer) to the
validation input, and open the valve (valve 3, reference Figure 4–1). The
test gauge should match the pressure reading from the density converter. If
there is an error, close valve 1 first, and then close valve 4. This will give a
more stable reading. If the readings are still in error, either the density
converter or the pressure transmitter may require calibration.

The pressure transmitter span and zero can be adjusted by up to five
percent independently using the adjusting screws located inside the end of
the transmitter (shown in Figure 6–1).

6-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Maintenance

Filter Condition

sor

Preventive Maintenance

Figure 6–1. Pressure transmitter with cover removed

You can check the condition of the filter by removing the element and
visually inspecting it or by varying the flow through the system and noting
the change in pressure. To check the filter using flow:

Density Sen

Check

1. Set the flow to 5 L/min and note the pressure.

2. Change the flow to 10 L/min. Pressure should not change by more

than 0.02 bar (0.3 psi).

Follow the steps below to check the density sensor.

1. Set the valves for validation, and purge the system with dry air at low

pressure.

2. After several minutes, disconnect the supply while closing valve 4

(reference Figure 4–1).

3. Allow the pressure to drop to atmospheric conditions.

4. When stable, record the density meter period. This period (adjusted for

temperature using the temperature coefficient published on the
calibration sheet and for the change in density of air at the test
conditions) should be within 200 nsec of the Tair published on the
sheet. If the Tair is not within specification, the density meter sensor
requires cleaning. Refer to the density meter’s manual.

Thermo Fisher Scientific Sarasota SG901 User Guide 6-3

If there are no problems, put the system back into service.

This page intentionally left blank.

Chapter 7

Troubleshooting & Service

Fault Diagnosis

This section provides troubleshooting steps for the analyzer.

Table 7–1. Fault diagnosis

Symptom Possible Problem / Solution

Condensation indicated by
large variations in density or
instrument failing to read
density.

Flow rate/system response
time is too long or is
unstable.

1. Condensation may be due to gas cooling on pressure
reduction through the regulator. This can be minimized by
reducing the flow rate or reducing the pressure at the
sample point, since ambient heat will be better able to
warm the gas stream and evaporate any condensation in
the sample tubing. If excessive cooling is a problem, a
heat trace is advisable.

2. Check the filter.

3. If the density meter alarm activates:

- Check the filter for condensate.

- Close the isolating valve and purge the system via the

calibration tee until a density reading is obtained which
is correct for the gas used.

Note: If purging fails, clean the density meter as
described in its manual and replace the filter.

1. Large changes in pressure of the inlet or exhaust may
affect flow rate and system response. If the process
conditions have been altered, adjust flow at the
regulating valve. If the exhaust pressure is unstable, a
back pressure regulator may be considered.

2. If the inlet pressure has been increased or is very high, a
pre-regulator at the sample point will decrease the
standard volume held in the sample transport line and,
therefore, the amount of gas that has to be transported to
the instrument, improving sample delay time.

Thermo Fisher Scientific Sarasota SG901 User Guide 7-1

Alarms raised by control room
type density converter.

Various alarms can be raised by the density converter. If the
converter is a control room type, typical alarms include:

- Density / Pressure too low: The pressure regulation has

failed or filters may be blocked, pressure is too low,
density is too low.

- Density / Pressure too high: The pressure regulation has

failed, or the exhaust return pressure is too high.

- Temperature too high / too low: PT100 failure. This

alarm may also indicate a process problem.

Troubleshooting & Service

ooting

SG901 /

Density

Troubleshooting Sarasota SG901 / CM515 Density Systems

Symptom Possible Problem / Solution

Troublesh

Sarasota

CM515

Systems

Alarms raised by the
Sarasota HME900 density
converter.

Typical alarms for the Sarasota HME900 density converter
are:

- Error 01 LSL: Lower sensor limit alarm

- Error 02 USL: Upper sensor limit alarm

- Error 03 EEPROM: Electrically Erasable Programmable
Read-Only Memory error

- Error 04 ADC: Analog-to-digital converter error

- Error 05: Pressure input error

- Error 06: PRT input error

- Error 07: Period input error

- Error 08 RAM: RAM error

- Error 09 ROM: ROM error

This section provides basic troubleshooting steps for problems that may
arise when using the Thermo Scientific Sarasota CM515 density converter
with the Sarasota SG901 with frequency output.

Caution This section provides troubleshooting guidance to instrument
technicians experienced with working on process instruments with low and
medium voltage supplies, intrinsically safe or explosion proof / flame proof
protected equipment, and connections to pressurized gas systems.
Maintenance and troubleshooting should be performed only by qualified
personnel.



The Sarasota SG901 consists of three instruments combined with a sample
system, which has various options and an optional electric heater or steam
enclosure heater mounted in a cabinet. These instruments are:

 Thermo Scientific Sarasota FD900 density meter

 PT100 thermometer element included in the density meter

 Pressure transmitter

Note Users should be familiar with operating the Sarasota CM515 and
Sarasota SG901 and with servicing the Sarasota FD900. Refer to the user
guides for each instrument (HB-CM515-DG01, HB-SG901, and
HB-ID/ FD900). 

7-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Note It is assumed that the system is in service and has product running
through it. 

Troubleshooting Sarasota SG901 / CM515 Density Systems

Table 7–2. Troubleshooting steps for Sarasota SG901 / CM515 density systems

Symptom Possible Fault Resolution / Further Investigation

Troubleshooting & Service

Sarasota CM515
display is blank or
backlight is not on.

System gives Zero
reading for SG.

- No power to instrument.

- Display is configured to switch
off after a predetermined time.

- Density calculated value is
zero or negative.

- If there is no power to the instrument the RUN LED will not be
lit. In this case, check power at the terminal connections.

- If power is available at the terminals, check the DC voltage
available at the EXC V terminals (with respect to Ground). If
voltage is available here, the PSU is operational.

- If voltage is not available, the PSU is faulty and requires repair.

- If power is available and the RUN LED is lit, press the
DISPLAY key. If the display comes on, it is likely that it is
configured to go off after a set period of inactivity. Change the
configuration to disable display timeout.

- If the main density is zero, check the period input. If the period
input is close to the expected period (read from the calibration
sheet), check if pressure and temperature readings are within
the expected ranges. If the period, pressure, and temperature
readings are in the correct ranges, verify the entered constants
T0, D0, K, TC, and PC are correct as per the calibration sheet 1
(constants for 15°C).

- If the temperature is in gross error, check the thermometer
connections and configuration.

- If the connections are correct at the Sarasota CM515, check
the configuration. Also verify the thermometer values are
correct at the meter connections (WY and XZ).

System gives Zero
reading for SG.

System gives Zero
reading for SG.

System gives Zero
reading for SG.

- Temperature is in gross error.

- Pressure reading is –ve.

- Pressure input is incorrect. Check the following:

- Period reads Zero or grossly
outside expected values.

- If the temperature is in gross error, check the thermometer
connections and configuration.

- If the connections are correct at the Sarasota CM515, check
the configuration. Also verify the thermometer values are
correct at the meter connections (WY and XZ). Check that any
fitted barriers are continuous (no blown barriers fuses).

- Input is connected correctly.

- Voltage available at the pressure transmitter terminals is
greater than 8 volts.

- Any fitted barriers are continuous (no blown barrier fuses).

- Configured Full Scale and Zero are correct and the input is
not set to default.

Check the following:

- Voltage at the density meter terminals exceeds 10 volts.

- The density input default value is set to zero (if a non-zero
value is set, the meter will use the default value).

Thermo Fisher Scientific Sarasota SG901 User Guide 7-3

Troubleshooting & Service

)f(Re

)Line(

)Line(

)f(Re

)Line()f(Re

T

T

P

P

DD ××=

( )

( )










−

−

×−=

mAmA

ApFs

ApFs

16FsZero

Troubleshooting Sarasota SG901 / CM515 Density Systems

Symptom Possible Fault Resolution / Further Investigation

System gives wrong
value for SG.

System gives
abnormal Z and

.

Z

(Ref)

None of the above
symptoms are
apparent but the
system gives
excessive errors.

None of the above
symptoms are
apparent but the
system gives
excessive errors.

- One of the three inputs
(pressure, temperature,
density) is in error.

- Check that displayed density (D
the process gas at the system pressure and temperature.

- Check that D

is approximately equal to:

(Ref)

) is the expected value for

(Line)

where P and T are in absolute values.

If D

- Z or Z

0.98 to 1.2.

is outside the range

(Ref)

is not within 1% of the calculated D

(Ref)

values Z and Z

(Ref)

.

- A gas equation of state other than “Ideal” has been chosen,
but Critical Pressure (Pc), Critical Temperature (Tc), or Acentric

check the

(Ref)

factor has not been set correctly. Either set the parameters or
choose “Ideal” equation. If “Ideal” is chosen, Z and Z

(Ref)

will

default to 1.

- Basic Density is in error. - Check that VIBDIM constants (Set 1) are in use and that VibDim
is per the calibration sheet and in the correct units.

- Check that DCF = 1 and D

= 0 (unless the unit history shows

off

that the density output has been adjusted during validation).

- If the above are not at fault, the meter should be cleaned and
put back in service.

- Pressure is in error. - If the pressure transmitter calibration is suspect, then
recalibrate the pressure transmitter by connecting a reference
pressure transmitter or indicator to the Validation gas input.
Note that the reference indicator must have an accuracy of

0.1% and be in absolute units. Adjust the pressure using the
input pressure regulator, and compare the Sarasota CM515
pressure reading to the indicator reading.

- The Pressure input can be corrected by setting the full scale
pressure to the full scale indicated by the indicator at 20 mA
output from the pressure transmitter. The Zero value can be
calculated from:

7-4 Sarasota SG901 User Guide Thermo Fisher Scientific

Where:

Fs = Measured full scale in Engineering Units at 20 mA

Ap = Measured Atmospheric Pressure in Engineering Units

= 20 mA

Fs

mA

Ap

= mA at Atmospheric Pressure

mA

Contact

Information

Process Instruments

1410 Gillingham Lane
Sugar Land, TX
77478 USA

[phone]
[phone] direct
[phone] fax

Troubleshooting & Service

Contact Information

If you have reviewed the troubleshooting section and the unit still is not
performing satisfactorily, the local representative is your first contact for
support and is well equipped to answer questions and provide application
assistance. You can also contact Thermo Fisher directly.

14 Gormley Industrial Avenue
Gormley, Ontario
L0H 1G0
CANADA

[phone]

[phone] fax

Unit 702-715, 7/F Tower West
Yonghe Plaza No. 28
Andingmen East Street, Beijing

100007 CHINA

[phone]

[phone] fax

A-101, 1CC Trade Tower
Senapati Bapat Road
Pune 411 016
Maharashtra, INDIA

[phone]
[phone] fax

www.thermoscientific.com

Ion Path, Road Three

Winsford, Cheshire

CW7 3GA

UNITED KINGDOM

[phone]

[phone] fax

Thermo Fisher Scientific Sarasota SG901 User Guide 7-5

Troubleshooting & Service

Warranty

Warranty

Thermo Scientific products are warranted to be free from defects in
material and workmanship at the time of shipment and for one year
thereafter. Any claimed defects in Thermo Scientific products must be
reported within the warranty period. Thermo Fisher shall have the right to
inspect such products at Buyer’s plant or to require Buyer to return such
products to Thermo Fisher’s plant.

In the event Thermo Fisher requests return of its products, Buyer shall ship
with transportation charges paid by the Buyer to Thermo Fisher’s plant.
Shipment of repaired or replacement goods from Thermo Fisher’s plant
shall be F.O.B. Thermo Fisher plant. A quotation of proposed work will be
sent to the customer. Thermo Fisher shall be liable only to replace or
repair, at its option, free of charge, products which are found by Thermo
Fisher to be defective in material or workmanship, and which are reported
to Thermo Fisher within the warranty period as provided above. This right
to replacement shall be Buyer’s exclusive remedy against Thermo Fisher.

Thermo Fisher shall not be liable for labor charges or other losses or
damages of any kind or description, including but not limited to,
incidental, special or consequential damages caused by defective products.
This warranty shall be void if recommendations provided by Thermo
Fisher or its Sales Representatives are not followed concerning methods of
operation, usage and storage or exposure to harsh conditions.

Materials and/or products furnished to Thermo Fisher by other suppliers
shall carry no warranty except such suppliers’ warranties as to materials and
workmanship. Thermo Fisher disclaims all warranties, expressed or
implied, with respect to such products.

EXCEPT AS OTHERWISE AGREED TO IN WRITING BY Thermo
Fisher, THE WARRANTIES GIVEN ABOVE ARE IN LIEU OF ALL
OTHER WARRANTIES, EXPRESSED OR IMPLIED, AND Thermo
Fisher HEREBY DISCLAIMS ALL OTHER WARRANTIES,
INCLUDING THOSE OF MERCHANTABILITY AND FITNESS
FOR PURPOSE.

7-6 Sarasota SG901 User Guide Thermo Fisher Scientific

Appendix A

Ordering Information

Table A–1. Sarasota SG901 specific gravity analyzer

Code Model

F Basic specific gravity analyzer with frequency output, no local display. Includes

density meter FD900F, cabinet (IP65 - NEMA 4X), thermometer element, and
pressure transmitter for compensation using Thermo Scientific Sarasota CM515
density convertor (other convertors can be used).

Notes: Maximum inlet sample pressure of 4 bar. Ambient temperature electronics

-20°C to 60°C (gas sample must remain above the dew point within this
temperature range).

H Basic specific gravity analyzer with Sarasota FD900 density meter and smart

headmount electronics, includes local display. Includes density meter FD900F,
cabinet (IP65 - NEMA 4X), thermometer element, and pressure transmitter for
compensation using Thermo Scientific Sarasota CM515 density convertor (other
convertors can be used)

Notes: Maximum inlet sample pressure of 4 bar. Ambient temperature electronics

-20°C to 60°C (gas sample must remain above the dew point within this
temperature range).

Code System Type

B Basic system: See descriptions above.

D Dry gas: Basic system components plus inlet sample pressure regulator, dry

particulate filter, flow indicator, flow control valve, system isolation valves,
manual valve for calibration/validation gases. Gas must be above its dew point.

W Wet gas: Dry gas system components plus coalescing filter with auto-drain (used

to remove occasional moisture contamination)

Code Spool Material

Z Ni-Span C: Use with non-corrosive gases; process temperatures < 75°C (167°F)

Y FV-520 B: Magnetic stainless steel suitable for all applications

Code Certification

C CSA Class I, Div 1 Groups B, C, & D (pending)

Thermo Fisher Scientific Sarasota SG901 User Guide A-1

I ATEX Intrinsically Safe (barriers not supplied with system; see barrier options in

Installation Accessories table) (pending)

Ordering Information

Code Heater Options

N No heater option

E Explosion proof electric heater:

ATEX EEx dm Zone 1 IIC T3 - Heater voltage 220 Vac / 50/60 Hz or CSA Class 1,
Div I, Groups B, C, & D T3 - Heater voltage 110 Vac / 50/60 Hz

Standard enclosure with precise temperature control up to 50°C at ± 0.5°C

Enclosure ambient temperature range -40°C to +50°C (HME inside enclosure)

H High temperature explosion proof electric heater:

ATEX EEx dm Zone 1 IIC T3 - Heater voltage 220 Vac / 50/60 Hz or CSA Class 1,
Div I, Groups B, C, & D T3 - Heater voltage 110 Vac / 50/60 Hz

High temp enclosure with precise temperature control at 60°C, 70°C, or 80°C at
± 0.5°C

Includes heating system and externally mounted meter electronics. Enclosure
ambient temperature range -20°C to +55°C

S Steam heater: Allows control of standard enclosure temperature at 50°C

Customer to provide dry steam of sufficient temperature and pressure

Enclosure ambient temperature range -40°C to 50°C

Code Options

N NACE Conformance: All wetted parts suitable for use in sour gas service; NACE

specification MR-01-75

T Traceable Calibration Certificate: Provides record of all instruments used during

calibration and their calibration certificates

M Wetted parts traceability to EN 10204. Type 3.1 (tubing and density meter only)

Table A–2. Instrument spares

P/N Description

ZV10-0060 Isolating valve, standard

ZV10-0050N Isolating valve, NACE

ZC80-0005B Check valve, standard

ZV10-2550 Check valve, NACE

ZF12-0061 Filter elements for coalescing filter (standard, dry gas system), 10 each

ZF12-0062 Filter elements for coalescing filter (standard, wet gas system), 10 each

ZF10-0030 Filter elements for coalescing filter (NACE, wet and dry gas systems), 10

each

A-2 Sarasota SG901 User Guide Thermo Fisher Scientific

SSG**** Spare spool: consult Thermo Fisher

HD-B0070 Spool lock ring

H90-0030/A Preset torque spanner

ZR20-0220/B Viton O-rings for 1.5” BSP end caps, 10 each

P/N Description

ZV25-0010 Flow control valve

ZV25-0010N Flow control valve, NACE

ZC01-0400 Bulkhead pipe fitting

ZC27-0010 Test point plug

Ordering Information

PC251/252-T

Local Display

ZV90-0026

HME spare card set: Includes PC251 Processor and PC252 Safety and
Isolation PCBs

Local display kit for HME: Includes mounting components and display
PCB

Smart heater system software: Control & diagnostic software to permit
setting temperature set point and diagnostics on heater system.
PC requirements: Windows 2000, XP, Vista, 7 with USB interface

Table A–3. Installation accessories

P/N Description

ZB/MTL/D4
(CM515)

ZB/MTL/D1 For use with headmount option only (set of 3 barriers):

For use with frequency output system with connection to Sarasota CM515
(set of 4 barriers):

2x MTL787S/28V-300 ohm + diode return for power to density meter

2x MTL755/3V 10 ohm AC barriers for 4-wire Platinum resistance
thermometer

2x MTL728/28V-300 ohm for density meter power supply and pressure
transducer loop power

1x MTL787S/28V-300 ohm + diode return for HART signal loop 4–20 mA

ZB/MTL/D5 Barrier Enclosure - ATEX EEx dp IIC T6 - CSA Class I, Div 1, Groups B, C, & D

Explosive Rated

For use with headmounted electronics only (set of 3 barriers):

2x MTL728/28V-300ohm for density meter power supply and pressure
transducer loop power

1x MTL787S/28V-300ohm + diode return for HART signal loop 4–20 mA
output systems.

For use where explosive rating required

ZB/ MTL/D6 Barrier Enclosure - ATEX EEx dp IIC T6 - CSA Class I, Div 1, Groups B, C, & D

Explosive Rated

For use with frequency output system only with connection to Sarasota
CM515 (set of 4 barriers):

2x MTL787S/28V-300 ohm + diode return for power to density meter

2x MTL755/3V 10 ohm AC barriers for 4-wire Platinum resistance
thermometer.

For use where explosive rating required

Thermo Fisher Scientific Sarasota SG901 User Guide A-3

This page intentionally left blank.

Appendix B

Specifications

Results may vary under different operating conditions.

Table B–1. Functional specifications

Range 0–2 SG; consult Thermo Fisher for other ranges.

Accuracy ± 0.2% of 1 sgu

Repeatability ± 0.02% span

Flow range Ideally 4 to 20 L/min (0.14 to 0.7 ft3/min)

Temperature coefficient
(corrected)

Operating temperature Standard: -20°C to +60°C (-4°F to +140°F) or as limited by

Operating and storage
humidity

Maximum operating
altitude

Sample inlet pressure Basic system: 4 bar A (58 psi A). Consult Thermo Fisher for

Exhaust pressure Must be less than 4 bar A (58 psi A) and less than the

Environmental rating IP65 (NEMA 4X)

0.01%/°C (0.006%/°F)

Note: Correction coefficients applied.

gas dew point. Consult Thermo Fisher for other ranges.

≤ 98%

3000 m

other pressures up to 20 bar (290 psi).

Dry or wet gas system: 200 bar (2900 psi) maximum.

regulated inlet pressure by 0.4 bar A (5.8 psi A).

Thermo Fisher Scientific Sarasota SG901 User Guide B-1

Specifications

Table B–2. Physical specifications

Spool materials Ni-Span C or FV520B

Tubes and fittings
materials

System enclosure
materials

Electronics enclosure
materials

Temperature
measurement

Dimensions Reference the drawing appendix.

Weight Net: Up to 60 kg (132 lb) depending on system

Shipping dimensions 940 x 680 x 270 mm (approximately 37 x 27 x 11 in)

Installation configuration 1/4” tubing compression fitting

Electrical connections Screw terminals

Power supply Frequency output option: 16–28 Vdc, 10 mA average (peak 18

Optional heater power
supply

Stainless steel (316L/1.4404)

304 stainless steel

Copper free aluminum grey epoxy finish; plate glass window
for headmount local display option

High accuracy 1/3 DIN integral 4-wire PT100 (RTD)

Shipping: Up to 94 kg (207 lb) depending on system

mA)

Headmount option: 3x 13–28 Vdc, 25 mA

CSA: 120 Vac, 50/60 Hz, 700 W

ATEX: 230 Vac, 50/60 Hz, 700 W

Outputs Frequency option: Frequency related to density on 2-wire

current modulated loop, 6–18 mA; 4-wire PT100; 4–20 mA
pressure.

Headmount option: Analog 4–20 mA related to SG, density, or
density derived variable; HART protocol.

B-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Table B–3. Compliance/Certification

Quality assurance ISO 9001:2000

CE mark Compliant

Electromagnetic Compatibility Compliant (EN 61326:1997)

Specifications

Pressure Equipment Directive

SEP (sound engineering practice)

(97/23/EC)

Safe Area Use As standard

BS EN ISO 15156 / NACE

Optional

MR0175 Conformance

ATEX (pending) EEx ia IIC T4 (without heater)

EEx ia IIC T3 (with heater)

CSA (pending) Class I, Div. 1, Groups B, C, & D

Calibration certification Calibration traceable to national standards. Calibration

certificates supplied as standard. Optional traceable
calibration equipment listing available.

Material traceability Wetted parts traceability to EN 10204. Type 3.1 (tubing

and density meter only)

Thermo Fisher Scientific Sarasota SG901 User Guide B-3

This page intentionally left blank.

Appendix C

Drawings

Note Information presented in this chapter has been regenerated from

original drawings. Every effort is made to maintain document accuracy.
However, in order to enhance legibility, the documents may have been
restructured, and some information may have been intentionally excluded.
Therefore, the drawings within this guide may not be exact duplicates of
the original drawings. 

Note Drawings in this manual are included for reference only and may not
be the current version. Contact the factory if you need a copy of the latest
revision. 

Table C–1.

Drawing # Rev. Description Page

SG91-6000 A General assembly drawing, wet gas system (3 sheets) C–2

SG91-6001 A General assembly drawing, dry gas system (3 sheets) C–5

SG91-6002 A General assembly drawing, basic gas system (3 sheets) C–8

SG91-6003 A General assembly drawing, HT wet gas system (3

sheets)

SG91-6004 A General assembly drawing, HT dry gas system (3

sheets)

SG91-6005 A General assembly drawing, HT basic gas system (3

sheets)

AD_6502 B Wiring diagrams, barrier options (2 sheets) C–20

C–11

C–14

C–17

Thermo Fisher Scientific Sarasota SG901 User Guide C-1

Drawings

Figure C–1. SG91-6000: General assembly drawing, wet gas system (sheet 1 of 3)

C-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-3

Figure C–2. SG91-6000: General assembly drawing, wet gas system (sheet 2 of 3)

Drawings

C-4 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–3. SG91-6000: General assembly drawing, wet gas system (sheet 3 of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-5

Figure C–4. SG91-6001: General assembly drawing, dry gas system (sheet 1 of 3)

Drawings

C-6 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–5. SG91-6001: General assembly drawing, dry gas system (sheet 2 of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-7

Figure C–6. SG91-6001: General assembly drawing, dry gas system (sheet 3 of 3)

Drawings

C-8 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–7. SG91-6002: General assembly drawing, basic gas system (3 sheets)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-9

Figure C–8. SG91-6002: General assembly drawing, basic gas system (sheet 2
of 3)

Drawings

C-10 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–9. SG91-6002: General assembly drawing, basic gas system (sheet 3
of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-11

Figure C–10. SG91-6003: General assembly drawing, HT wet gas system (sheet 1
of 3)

Drawings

C-12 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–11. SG91-6003: General assembly drawing, HT wet gas system (sheet
2 of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-13

Figure C–12. SG91-6003: General assembly drawing, HT wet gas system (sheet
3 of 3)

Drawings

C-14 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–13. SG91-6004: General assembly drawing, HT dry gas system (sheet 1
of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-15

Figure C–14. SG91-6004: General assembly drawing, HT dry gas system (sheet
2 of 3)

Drawings

C-16 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–15. SG91-6004: General assembly drawing, HT dry gas system (sheet
3 of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-17

Figure C–16. SG91-6005: General assembly drawing, HT basic gas system (sheet
1 of 3)

Drawings

C-18 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–17. SG91-6005: General assembly drawing, HT basic gas system
(sheet 2 of 3)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-19

Figure C–18. SG91-6005: General assembly drawing, HT basic gas system
(sheet 3 of 3)

Drawings

C-20 Sarasota SG901 User Guide Thermo Fisher Scientific

Figure C–19. AD_6502: Wiring diagrams, barrier options (sheet 1 of 2)

Drawings

Thermo Fisher Scientific Sarasota SG901 User Guide C-21

Figure C–20. AD_6502: Wiring diagrams, barrier options (sheet 2 of 2)

This page intentionally left blank.

Appendix D

Health & Safety Clearance Form

The Health & Safety (COSHH) Clearance form can be found on the
following page. Failure to return this form may result in the meter being
returned.

Thermo Fisher Scientific Sarasota SG901 User Guide D-1

This page intentionally left blank.

1410 Gillingham Lane

Sugar Land, TX 77478 USA

Tel: [phone]

Fax: [phone]

HEALTH AND SAFETY (COSHH) CLEARANCE FORM

Failure to comply with this procedure will result in equipment service delays.

This form must be completed for all equipment returned to Thermo Fisher Scientific (Thermo Fisher) – Sugar Land Depot

Repair. Depot repair personnel are unable to handle any equipment that has been in contact with a process fluid or hazardous

material if it is not accompanied by this correctly completed Health and Safety Clearance Form.

All sections of this form must be completed, and the form must arrive at Thermo Fisher prior to the arrival of the equipment. A

copy of this form must also accompany the equipment.

Prior to returning any equipment for service, authorization must be obtained from customer service. A Return Material

Authorization (RMA) number will be issued and must be entered in Section 1 of this form.

Section 1: Reference Details

RMA #:

Equipment type:

Serial #:

Section 2: Process Fluid Information

All substances in contact with the equipment must be

declared.

Chemical names (list all):

Precautions to be taken when handling these substances (list

all):

Action to be taken in the event of human contact or

spillage:

Additional information you consider relevant:

Section 3: Shipping Information

Carrier details:

Tel:

/ Fax:

Section 4: Declaration

Must be authorized ONLY if non-toxic or non-

hazardous substances apply.

I hereby confirm that the equipment specified above has not

come into contact with any toxic or hazardous substances.

Signed:

Name:

Position:

For/on behalf of:

Date:

Must be authorized if toxic or hazardous substances

apply.

I hereby confirm that the only toxic or hazardous

substances that the equipment specified has been in contact

with are named in Section 2, that the information given is

correct, and that the following actions have been taken:

1. The equipment has been drained and flushed.

2. The inlet/outlet ports have been sealed, and the

equipment has been securely packed and labeled.

3. The carrier has been informed of the hazardous nature

of the consignment and has received a copy of this

completed form.

Signed:

Scheduled delivery date to Thermo Fisher:

A copy of this completed form MUST BE HANDED TO THE CARRIER to accompany the equipment.

Form No.: QF_COSHH ECO: 5424 REV: B Date 12-08-06

Name:

Position:

For/on behalf of:

Date:

This page intentionally left blank.

Appendix E

,

't

)'tt(

K2

't

)'tt(

'd

0

0

0

0

0m











−

×+×

−

×=ρ

.

ta

RVIBDIM

- 1 D0 =

d

2

0





























×

×

′

.

LPISENEX

= a

m

2

1















ρ

××

Equations

The following equations are provided in this appendix:

 Basic density equation

 Rho

 Density at Reference Conditions (Gas)

 Compressibility (Gas)

 Reference Compressibility (Gas)

 Gravity / Relative Density (Gas)

 Molecular Weight

 Az & Bz from M

& Z

air

air

Basic density equation

where

).PP(PRESCO)TT(TEMPCO0T't

−×+−×+=

calcal0

Thermo Fisher Scientific Sarasota SG901 User Guide E-1

(continued)

Equations

If P = 0 or d'0 or d'0< 0.8D0, then d'0= D0.

On first cycle, d'0 = D0.

ρm = measured line density in kg/m3 [lb/ft3]

T0 = calibration constant of spool in µsec

t'0 = corrected calibration constant of spool in µsec

D0 = calibration constant of spool in kg/m3 [lb/ft3]

d'0= VOS corrected calibration constant of spool in kg/m3 [lb/ft3]

K = calibration constant of spool in kg/m3/°C [lb/ft3/°F]
TEMPCO = temperature coefficient of spool in µsec/°C [µsec/°F]
PRESCO = pressure coefficient of the transducer in µsec/bar [µsec/psi]

VIBDIM = characteristics of vibrating element in mm (in)

ISENEX = isentropic exponent of gas
t = measured period in µsec

T = measured/fixed line temperature in K [°R]

T

= calibration temperature of densitometer, 288.15K [519.67°R]

cal

P = measured/fixed line pressure in bar A [psi A]

P

= calibration pressure of densitometer, 1.01325 bar A [14.696

cal

psi A]

L = speed of sound factor, 100000 pa/bar (4633.05567 lbdw/ft2/psi)

R = VOS correction to density 1000 (106/12).

E-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Rho

air

air

ZTref

efPrJ××

=ρ











−










−=

r

5.1

r

air

B

Tref

A

Tref

efPr

J1Z

ZrefTrefP

ZTPref

m

c

××

×××

ρ

=

ρ

& Z

air

air

ρ

= density of air at reference conditions

air

Z

= compressibility factor of air at reference conditions

air

J = gas constant, 348.362 K.kg/m3/bar (2.69732428 °R.lb/ft3/psi)

Pref = reference pressure in bar (psi)

Tref = reference temperature in K (°R)

Ar = Az value for air, 6.18307495 K

1.5.m3

/kg (239.183045 °R

Br = Bz value for air, 0.0009235295 m3/kg (0.014793396 ft3/lb)

Equations

1.5

.ft3/lb)

Density at Reference Conditions (Gas)

ρc = density of gas at reference P and T in kg/m³ (lb/ft³)
ρm = measured gas density in kg/m³ [lb/ft³]

Pref = reference pressure in bar (psi)

Tref = reference temperature in K (°R)

T = absolute temperature in K (°R)

P = absolute pressure in bar (psia)

Z = gas compressibility factor

Zref = reference compressibility factor

Thermo Fisher Scientific Sarasota SG901 User Guide E-3

Equations

( )

mz

5.1

mz

mz

B1T

A

B1

1

Z

ρ×+×

ρ×

−

ρ×−

=











−×

ρ

×−=

z

1.5

z

air

B

Tref

A

G1Zref

ρ

ρ

=

air

c

G

Compressibility (Gas)

If Bz x ρm > 1, then Z = 1.

Z = gas compressibility

Az = R-K fluid constant for Z in K

1.5.m3

Bz = R-K fluid constant for Z in m3/kg (ft3/lb)

ρm = measured density of gas

T = absolute temperature in K (°R)

Reference Compressibility (Gas)

On first pass through calculations, Zref = 1.

/kg (°R

1.5

.ft3/lb)

Subsequently,

If Zref < 0.8, then set Zref = 0.8.

If Zref > 1.145, then set Zref = 1.145.

Zref = reference compressibility

G = relative density (SG)

Az = R-K fluid constant for Z in K

Bz = R-K fluid constant for Z in m3/kg (ft3/lb)

Tref = reference temperature K (°R)

Gravity / Relative Density (Gas)

1.5.m3

/kg (°R

1.5

.ft3/lb)

E-4 Sarasota SG901 User Guide Thermo Fisher Scientific

G = relative density (SG)

ρc = density of gas at reference pressure and temperature

p

= density or air at reference pressure and temperature

air

Molecular Weight

×=

( ) ( )

Equations

28.964GMW

MW = molecular weight of gas

G = Relative density (SG)

Az & Bz from MW

z

z

For Sarasota HME900 with imperial units:

683931.38AA

×=

zz

0185.16BB

×=

zz

MW = molecular weight

Az= R-K fluid constant for Z in K

1.5.m3

Bz = R-K fluid constant for Z in m3/kg (ft3/lb)

/kg (°R

1.5

.ft3/lb)

-3

2

10

××−×+=

MW

26-4-3-

MW1039199357.2MW1074198514.2)1021540275.8(B ××+××−×=

)3.23133483MW00681.14077.25973245(A

Thermo Fisher Scientific Sarasota SG901 User Guide E-5

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Appendix F

Configuration Considerations when
Using Sarasota CM515

Purpose

Equations

When the Sarasota CM515 density converter is used in a Sarasota SG901
with frequency output system, the density converter can be configured to
use different formula schemes to deal with gas compressibility, Critical
Pressure, and Critical Temperature parameters. This appendix explains the
different formula schemes available in the density converter and shows the
basic configuration (in metric) of the Sarasota SG901 / CM515 system.

When using the Sarasota CM515 for D-ref (Density at Reference), MW
(Molecular Weight) or SG (Specific Gravity) measurement, the user has a
choice of which equations the converter will use for its calculation.

The equations available in the Sarasota CM515 are briefly described below.

 Ideal Gas: The ideal gas laws are implemented. No compensation is

made for gas compressibility (ideal gas law deviations).

 Redlich Kwong (RK): The RK equation of state is implemented.

The user must enter an isentropic exponent, critical pressure, and
temperature for the gas or an average isentropic exponent and a
quasi critical temperature and critical pressure for a gas mixture.

 Soave: This is a modification to RK and can give slightly better

results. The user must enter an isentropic exponent, an Acentric
factor, and a critical pressure and temperature for the gas or an
average isentropic exponent, an average Acentric factor, and a quasi
critical temperature and critical pressure for a gas mixture.

Thermo Fisher Scientific Sarasota SG901 User Guide F-1

 Peng Robinson: This is another variation. The user must enter an

isentropic exponent, an Acentric factor, and a critical pressure and
temperature for the gas or an average isentropic exponent, an
average Acentric factor, and a quasi critical temperature and critical
pressure for a gas mixture.

It is suggested that either the Ideal or Soave equation is selected depending
on the accuracy required and the gas data available.

Configuration Considerations when Using Sarasota CM515

Equations

There is an option to estimate Cp and Ct from specific gravity using two
quadratic curve fits, one for Critical Pressure and one for Critical
Temperature.

The curve is in the following form:

where

y = either Critical Pressure or Critical Temperature

x = specific gravity

Both isentropic exponent and Acentric factor have to be fixed at the
average for the gas mix. If RK is chosen then Acentric factor is not
required.

To disable the Cp – Ct estimation, the fixed Cp and Ct should be entered
into the Critical Pressure and Critical Temperature base locations while the
Critical Pressure and Critical Temperature coefficients A and B are set to
zero.

y = ax^2 + bx + c

If the quadratic fit is to be used then the coefficients from the quadratic
ax^2 + bx + c should be entered as below:

c is entered into the base location.

a is entered into the B coefficient.

b is entered into the A coefficient location.

The curve fit must be in the units chosen for the base location.

The table below gives an example of values to be used for Cp in bar A and
Ct in Deg C. The table includes the Critical Temperature, Critical
Pressure, and Acentric factor. The suggested fit data showing the
coefficients assume an average Acentric factor based on a uniform equal %
mix (16.6% of each component). Where the mix is predominately H2 and
CH4, the Acentric factor should be adjusted to allow for this.

The Acentric factor can be adjusted to fit the normal proportions of the
mix by taking the sum of the products of the gas constituent Acentric
factor and the volume percent of each constituent.

F-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Configuration Considerations when Using Sarasota CM515

( )

Critical

Temperature and

Critical Temperature and Critical Pressure

Table F–1.

Ct K CP Bar A Acentric Factor

H2 33.2 12.9696 -0.22

CH4 190.6 45.94076 0.008

C2H6 305.4 48.83865 0.098

C3H8 396.8 42.45518 0.152

C4H10 452.2 37.99688 0.193

C5H12 496.6 33.74123 0.251

Table F–2.

Data assuming curve fit gives ax^2 + bx +c

CT is in K and CP is in bar A.

Standard Form Coefficients a b c

Sarasota CM515 Coefficients B A Base

CT calc -61.092 344.82 12.901

Critical Pressure

CP calc -17.72 50.606 12.9

Acentric factor 0.0775 Isentropic exp 1.3

Unlike the Thermo Scientific Sarasota HC900 and Sarasota HME900, the
Sarasota CM515 calculates compressibility using Critical Pressure and
Critical Temperature rather than Az and Bz, which are derived (partially
calculated) constants for the RK equation of state.

Where gas mixtures are used, pseudo Critical Pressure and Temperatures
can be calculated. However, in SG applications there is the option of
including a quadratic fit where Critical Pressure and Critical Temperature
are inferred from SG.

The entry of Critical Pressure and Critical Temperature is arranged such
that:

If the entry of CT or CP is made as a Base figure with the values of
Constants A and B set to zero, then the entered base figures are used as
CT and CP.

If the constants A and B are entered as non-zero values, then CT and
CP are calculated as:

Thermo Fisher Scientific Sarasota SG901 User Guide F-3

.

2SGBSGA1BaseCP)or(CT ×+×+×=

Configuration Considerations when Using Sarasota CM515

Critical Temperature and Critical Pressure

This allows the user to fit the basic constituents CT and CP values to a
quadratic equation and then enter constants Critical Pressure Base, A, and
B or Critical Temperature Base, A, and B. An example of this is shown
below.

Table F–3.

ATMOS K Bar

SG Cp Ct CP CT Calc CP Calc

H2 0.069046 12.8 33.2 12.9696 36.41803155 16.30964

CH4 0.552364 45.34 190.6 45.94076 184.7276523 35.44646

C2H6 1.035683 48.2 305.4 48.83865 304.4954727 46.3046

C3H8 1.519001 41.9 396.8 42.45518 395.7214929 48.88407

C4H10 2.00232 37.5 452.2 37.99688 458.4057127 43.18487

C5H12 2.485639 33.3 496.6 33.74123 492.5481323 29.20699

The above table shows the CP and CT for typical gas constituents. The
data was fitted to the curves in the equations below, and the CP Calc in bar
and CT Calc in K are shown in the calc results.

Table F–4.

Data assuming curve fit gives ax^2 + bx +c

CT is in K and CP is in bar A.

Standard Form Coefficients a b c

Sarasota CM515 Coefficients B A Base

CT calc -61.092 344.82 12.901

CP calc -17.72 50.606 12.9

Acentric factor 0.0775 Isentropic exp 1.3

CT Entered -4.73545 26.72816061 12.901

CP Entered -1.37364 3.922945736 12.9

Note that the coefficients a, b, and c relate to the form A * SG^2 + B * SG
+ C. CT Entered and CP Entered relate the constants A, B, and C to the
Entered CT or CP constants for the Sarasota CM515.

Note that A = b/base and B = A/base in each case.

F-4 Sarasota SG901 User Guide Thermo Fisher Scientific

General

Configuration

(Metric)

for SG

Measurement

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

During configuration of the Sarasota CM515, units and number formats
are chosen to give sufficient resolution. For example, pressure displayed in
bar gives display resolution of 0.001 bar. If this is not sufficient, the kPa
may be chosen. However, care should be taken to ensure that the display
does not overflow. For entry of numbers, exponential format may be
chosen to maximize resolution. For example, the density meter constant K
is always close to 1, so in order to enter the value to more than three
decimal places, the notation 1.000 10^-3 may be chosen. The entry

1.12345 becomes 1234.5 * 10^-3.

In the Sarasota CM515, configure the items for the menus listed below as
shown in the tables on the following pages.

 Variables menu

 Parameters menu

 Input menu

 Output menu

 Alarms menu

 Comms menu

 TM/LOG menu

 Setup menu

Thermo Fisher Scientific Sarasota SG901 User Guide F-5

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

Table F–5. Variables menu items

Variables Units Resolution Comments

Display Variable Name

Density (Line) kg/m

Period µs 1 ns

Density (Reference) kg/m

Temperature °C 0.1°C

Pressure bar 0.001 bar

Specific Gravity E^-3 0.000001 SGU

Compressibility Factor
(Line)

3

0.001 kg/m3

3

0.001 kg/m3

E^-3 0.000001

Compressibility Factor
(Reference)

Molecular Weight E^0 0.001 MW Can be set to E^-3 if greater

Critical Temperature Kelvin 0.001 K

Critical Pressure bar A 0.001 bar Critical Pressure is normally only

User input No options

User output A No options

User output B No options

E^-3 0.000001

resolution required.

described to 1 DP.

F-6 Sarasota SG901 User Guide Thermo Fisher Scientific

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

Table F–6. Parameters menu items

Parameters Setting Units Comments

Display Parameter Name

Default Period 0.00 Only set to a value for test

purposes.

Atmospheric
Pressure

Reference
Temperature

101.325 kPa Abs Entry should be made exactly as
it should appear on the display.

0.00 °C May be 15°C in some cases.

Reference Pressure 101.325 kPa Abs May be 100.000 kPa in some

cases.

Calculation Type

IDEAL N/A

SOAVE N/A Must enter Ct, Cp, and Acentric

factor.

Line Density
Correction Factor

Line Density
Correction Offset

User Defined
Function Input X

User Defined
Function Input Y

User Defined

1.0 E^0

0.00 kg/m

3

Density Line No options Not required. Only set for

standardization.

Temperature No options Not required. Only set for

standardization.

No entry No entry

Function Table

Spool K Cal cert. value *

Spool D0 From cal cert. kg/m

Spool T0 From cal cert. µs

Spool Tempco Cal cert. value *

Spool Presco 0.0 ns/bar

VIBDIM 15.8

Gas Isentropic
Exponent

Gas Critical
Temperature Base

Thermo Fisher Scientific Sarasota SG901 User Guide F-7

E^-3 Enter in ns. Cal cert. value is in

1000

3

ns/°C Enter in ns. Cal cert. value is in

1000

1.3

Single gas Ct or gas

Units of Ct (°C or K)

mix quasi Ct

12.901 K

µs.

µs.

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

Parameters Setting Units Comments

Display Parameter Name

Gas Ct Coefficient A 0

Gas Ct Coefficient B 0

Gas Critical Pressure
Base

Gas Cp Coefficient A 0

Gas Cp Coefficient B 0

Gas Acentric Factor Single Gas Acentric

344.82 No choice. From
equation that gives K.

-61.092 No choice. From
equation that gives K.

Singe gas Cp or gas
mix quasi Cp

12.9 bar A

50.606 No choice. From

-17.72 No choice, but from

Factor or Quasi
Acentric Factor for
Mix

Units of Cp

equation that gives bar
A.

equation that gives bar
A.

No units

0.0775 No units

F-8 Sarasota SG901 User Guide Thermo Fisher Scientific

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

Table F–7. Input menu items

Input Setting Units Comments

Display Parameter Name

Pulse Input 1
Assignment

Pulse Input 1 Signal
Type

Pulse Input 1 Signal
Debounce

Pulse Input 1
Frequency Cutoff

Pulse Input 1
Filtering

Analog Input 1
Assignment

Analog Input 1
Signal Type

Analog Signal 1
Default Type

Analog Input 1
Minimum Point

Density Line Fixed default

PULSE Density pulse

DISABLE

100

0

Temperature Fixed default

PT100

50 Deg C Assume heated SG system and

set to heater set temperature.

0 Deg C

Analog Input 1

50 Deg C

Maximum Point

Analog Input 2

Pressure Fixed default

Assignment

Analog Input 2

ABSOL (Absolute)
Pressure Sensor
Type

Analog Input 2
Signal Type

Analog Input 2
Default

Analog Input 2
Minimum Point

Analog Input 2
Maximum Point

Values on Exception Default

4–20 mA

3.8 bar A Set to the regulator pressure

0 bar A

4 bar A

setting.

Thermo Fisher Scientific Sarasota SG901 User Guide F-9

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

Table F–8. Output menu items

Output Setting Units Comments

Display Parameter Name

Output 1 Assignment Specific Gravity Unless SG not required.

Output 1 Minimum 0 SGU Depends upon customer

Output 1 Maximum 2 SGU Depends upon customer

Output 2 Assignment Molecular Weight Unless MW not required.

Output 2 Minimum 2 Depends upon customer

Output 2 Maximum 58 Depends upon customer

requirements.

requirements.

requirements.

requirements.

Table F–9. Alarms menu items

Alarms Setting Comments

Display Parameter Name

Alarm 1 Assignment SG Or on other variable according to customer requirement.

Alarm 1 Type LO-NC Low alarm, Normally Closed contacts.

Alarm 1 Setpoint 0.02

Alarm 1 Hysteresis 0.02 Or 10% below zero value.

Alarm 2 Assignment SG Or on other variable according to customer requirement.

Alarm 2 Type HI-NC High alarm, Normally Closed contacts.

Alarm 2 Setpoint 2.2 Or 10% above full scale.

Alarm 2 Hysteresis 0.1 Or 5% of alarm point.

Alarm 3 Assignment Density Line Setting not important, as this is the equipment fail alarm.

Alarm 3 Type AL-NC Equipment alarm, Normally Closed contacts.

Alarm 3 Setpoint 10 Ignored during running.

Alarm 3 Hysteresis 0.5 Ignored during running.

Alarm 4 Assignment Period

F-10 Sarasota SG901 User Guide Thermo Fisher Scientific

Configuration Considerations when Using Sarasota CM515

Alarms Setting Comments

Display Parameter Name

Alarm 4 Type LO-NO Alarm disabled.

Alarm 4 Setpoint -1

Alarm 4 Hysteresis 0

Table F–10. Comms menu items

Comms Setting

Display Parameter Name

RS232 Protocol RTU (Modbus RTU)

Baud 9600

Parity None

General Configuration (Metric) for SG Measurement

Stop Bits 1

RS485 Protocol RTU (Modbus RTU)

Baud 19200

Parity None

Stop Bits 1

IR Protocol ASCII (Modbus ASCII)

Baud 19200

Parity None

Stop Bits 1

Modbus RTU Address 1

Modbus ASCII Address 2

Flash Driver Port RS232

Thermo Fisher Scientific Sarasota SG901 User Guide F-11

Configuration Considerations when Using Sarasota CM515

General Configuration (Metric) for SG Measurement

Table F–11. TM/LOG menu items

TM/LOG Setting

Display Parameter Name

Clock Date Format DAY-M (Day-Month)

Clock Year

Clock Date (Day-Month)

Clock Time (Hour Min)

Logging Hours 24

Logging Days 31

Logging Weeks 4

Logging Months 12

Logging Years 2

Logging Reset Password protected

Printer Protocol Report Type REP-01 (hourly logs report)

Print Protocol Printer Type PRN-01 (generic computer printer)

Table F–12. Setup menu items

Setup Setting Units Comments

Display Parameter Name

Default Variable Specific Gravity Depends upon customer outputs.

Transducer Supply 24V Default is 12V.

Display Timeout
Mode

Display Timeout
Period

Display Tags DEFAULT

Backlight Timeout DISABLE

DISABLE

30

Docket Number
Reset

F-12 Sarasota SG901 User Guide Thermo Fisher Scientific

Password 000000

Password protected

Index

A

ATEX, 2-2, 2-4, 6-2

B

basic system, 1-2

frequency output option, 1-1–1-2

commissioning, 3-1
system configuration with Sarasota CM515, F-1–F-12
thermometry check, 6-2
wiring, 2-4

H

C

calibrating, 5-1–5-4
calibration, 5-1–5-4
commissioning, 3-1–3-2
configurations. See system types.
contact information, 7-5

D

density converter, 6-2, 7-1

commissioning, 3-2

density meter, 1-2, 5-1

density sensor check, 6-3

dry gas system, 1-2

ordering information, A-1

E

equations, E-1–E-5

Az & Bz from MW, E-5
basic density, E-1
density at reference conditions (gas), E-3
gravity / relative density (gas), E-4
Ideal Gas, F-1
molecular weight, E-5
Peng Robinson, F-1
Redlick Kwong (RK), F-1
reference compressibility (gas), E-4
Soave, F-1

F

hazardous areas, 2-2
headmount option, 1-1–1-2

commissioning, 3-1

wiring, 2-4

heater, 1-1, 2-3

electric

preventive maintenance, 6-2

wiring, 2-4–2-5

I

Ideal Gas equation, F-1
installation, 2-1–2-5

drawings, C-1–C-21
guidelines, 2-1–2-2
in h

azardous areas, 2-2

installing, 2-1–2-5

guidelines for, 2-1–2-2
in hazardous areas, 2-2

M

maintenance, 6-1–6-3

O

ordering information, A-1–A-3

P

Peng Robinson equation, F-1
pressure transmitter, 1-2, 6-2

filter, 1-2, 6-3, 7-1

Thermo Fisher Scientific Sarasota SG901 User Guide INDEX-1

Index

R

Redlich Kwong (RK) equation, F-1
RK. See Redlich Kwong (RK) equation

S

safety, xi, 2-2, 3-1, D-1
sample system

commissioning, 3-2
Sarasota CM200, 5-2
Sarasota CM515, 5-2

configuration Sarasota SG901 with, F-1–F-12

troubleshooting, 7-2–7-4
Sarasota HC900, 5-2, F-3
Sarasota HME900, 7-2, F-3
SG. See specific gravity
Soave equation, F-1
specific gravity (SG), 1-1, 1-3, 4-2, 5-3

calculation, 5-1–5-2

configuration of Sarasota CM515 for measurement of,

F-1–F-12

equations, E-1–E-5
specifications, B-1–B-3

for cable used in hazardous areas, 2-2
start-up. See commissioning
system types, 1-1–1-2, also see headmount option., also see

frequency output option.

basic system, 1-2, 3-2
dry gas system, 1-2, 3-2
ordering information, A-1

wet gas system, 1-2, 3-2

T

troubleshooting, 7-1–7-4

V

validating, 4-1–4-3

with injection sample, 4-2

with process gas sample, 4-3

validation, 4-1–4-3

with injection sample, 4-2

with process gas sample, 4-3

W

wet gas system

ordering information, A-1

wiring, 2-3–2-4

diagrams, C-20

for electric heater, 2-4–2-5

for system with frequency output, 2-4

for system with headmount option, 2-4

INDEX-2 Sarasota SG901 User Guide Thermo Fisher Scientific

Thermo Fisher Scientific
81 Wyman Street
P.O. Box 9046
Waltham, Massachusetts 02454-9046
United States

www.thermofisher.com