Teledyne 8800T User manual

instruction

manual

Teledyne Analytical Instruments

A Business Unit of Teledyne Electronic Technologies

Model 8800T

TRACE MOISTURE ANALYZER

8800T User’sManual

8800T User’sManualTable ofContents

1.0 Overviewof the8800T .................................................1

2.1 Precautions using the sensor .........................................3

2.2 Sensor Technical Specifications ...................................4

2.3 Sensor Installation & Sampling Techniques .................4

2.3.1 In-situ Installation ......................................................5

2.3.2 Extractive Installation ................................................7

2.4 Troubleshooting unexpected readings ..........................9

3.1 Precautionsusing the8800T .......................................13

3.1.1 Electromagnetic Compatibility Considerations .......13

3.2 Instrument Technical Specifications ...........................14

3.3 Installation ..................................................................15

3.3.1 Mechanical Installation ............................................15

3.3.2 Electrical Installation ...............................................16

3.4 Operating the Instrument ............................................17

3.4.1 Starting up ................................................................17

3.4.2 Display Conventions ................................................17

3.4.3 Push Buttons ............................................................19

3.4.4 Operating State ........................................................19

3.4.4.1 Viewing Dewpoint Mode ......................................20

3.4.4.2 Viewing Temperature at the Sensor ......................20

3.4.4.3 Start Calibration (SpanCheck™) Mode ................21

3.4.4.4 Viewing Serial Number Mode ..............................24

3.4.5 SetUp State ..............................................................24

3.5 Troubleshooting the Instrument ..................................28

Appendix A: Operating State User Interface flowchart ....31

Appendix B: Set-Up State User Interface flowchart .........32

Appendix C:8800T MechanicalDrawing ........................34

Appendix D:8800T ElectricalConnections.....................35

Appendix E: Sensor/SpanCheck™ Theory of Operation .36

Appendix F: Pressure Correction ......................................39

Appendix G: Current vs. Dewpoint ..................................40

8800T User’sManual

iii

Appendix H: Uncertainty in LBS & ppmV calculations ..43

Appendix I: Sensor Response Time ..................................44

Appendix J: Return Authorization Request ......................45

Section 1: Introduction

page 1

1.0 Overviewofthe8800T

The8800T isamicroprocessor based 4-20mAloop powered

(2 wire) hygrometer, for measuring moisture content in

gases in the range from -100°C to +20°C. The measurement

is displayed on the instrument’s custom LCD, and is trans-

mitted by varying the current drawn (4-20mA) from the

power supply.The current varies linearly proportional to the

selected measurement units. An optional digital output is

available which modulates/demodulates the 4-20mA loop

line without interfering with its operation. With this option

the8800T iscapableof communicatingwith properly

equipped Personal Computers or other RS-232 capable con-

trollers. Three front panel buttons provide the user with a

widevariety of features. The8800T’sadvanced design

allows it to be housed in a small stainless steel enclosure

behind the sensor probe, thus the instrument and sensor are

a single integrated unit.

The8800T usestheTeledyne HTF™sensor which isencap-

sulated in sintered stainless steel, thus it is capable of com-

ing into contact with a wide variety of environments.

However one should keep in mind that the sensor is a sensi-

tive device and it should be handled accordingly.

8800T User’sManual

page 2

Section 2: Sensor and Sampling Techniques

page 3

2.1 Precautions using the sensor

TheTeledyne HTF™Al2O3sensor isdesigned and field

proven to behighly reliable, rugged and maintenancefree.

However the user should consider the following precau-

tions:

• To avoid the need for prolonged dry-down (when

expecting to measure dewpoints dryer than -65ºC), do

not expose the sensor to room air longer than necessary

(1 - 2 minutes). Thus, do not open the sensor container

before you are ready to install the sensor.

• The sensor container has desiccant to keep the sensor

dry during shipping and to avoid damage due to conden-

sation. Close the container immediately after removing

the sensor to avoid degradation of the desiccant.

• Do not throw away the sensor container, you may use it

again to transport the sensor between locations, to store

it between uses or to ship it back to the factory for certi-

fication. The container can be attached to the loop cable,

by trapping the cable with the lid strap.

• Do not expose the sensor to corrosive gases such as

gases containing chlorine, ammonia or HCl. (SO2 can

be monitored when the moisture content is low).

• Except for the XTR65W sensor:

1. Do not expose the sensor to liquid water, as it may get

damaged.

2. Do not breathe directly onto the sensor, as condensa-

tion may form which could damage the sensor element.

• Do not install the sensor near heat sources such as radia-

tors or air ducts.

• Do not install the sensor in places subject to extreme

mechanical vibration or shock. If this is not avoidable,

use resilient mounting. If in doubt, call your representa-

8800T User’sManual

page 4

tive.

• Do not disassemble the porous metal filter encapsula-

tion, as this will damage the sensor and void your fac-

tory warranty.

• Prior to installation of the probe, ensure that no contam-

inants are present in the system (e.g. oil, liquid water).

2.2 Sensor Technical Specifications

Type: .................................Hyper Thin Film high capacitance Al2O3.

Dewpoint range:

XTR-100........................-148°F to +68°F (-100°C to +20°C)

XTR-65..........................-85°F to +68°F (-65°C to +20°C).

Capacitance:......................15nF to 200nF.

Accuracy:..........................±5.5°F (±3°C).

Repeatability:....................±0.9°F (±0.5°C).

Response time:..................see graph in Appendix I.

Temperature range: ...........-10°C to +70°C.

Sample Flow range:

(linear velocity @ 1ATM):Static to 100m/s.

Storage temperature:.........-40°F to+176°F (-40°C to +80°C).

Mechanical:.......................encapsulated in 100µsintered stainless steel.

Calibration method: ..........SpanCheck™, sensor saturates at dewpoint above

+68°F (+20°C). NIST/NPL traceable multi-point

factory calibration available optionally.

2.3 Sensor Installation & Sampling Techniques

Keep in mind that the moisture content at the sensor is not

only due to the moisture of the gas being measured, but also

due to desorption of water from tubing, trapped moisture (at

the interconnection points, valves, filters and other hygro-

scopic materials in the system), leaks in the system, and oth-

ers. Thus the measurement may vary from the expectation,

and therefore care should be taken in choosing the sampling

technique utilized in the measurement. Factors such as gas

pressure, flow rate, materials of construction, length and

Section 2: Sensor and Sampling Techniques

page 5

diameter of tubing, number of interconnecting fittings, dead

space in tubing and manifolds; will influence the measure-

ment value and response time.

The highcapacitance HTF™ sensors can be installed either

directly in the lineto be sampled (in-situ), or in a slip stream

of a sample system (extractive).

To assure a long and accurate performance of the sensor, it

should be protected from contaminants such as liquids

(water, oil etc.), and particulates. The sintered stainless steel

sensor encapsulation protects from particulates larger than

100 microns, finer particulates (e.g. from degraded desic-

cant or rust) should be filtered with a particulate filter with

suitable capability, do not use hygroscopic filter materials.

2.3.1 In-situ Installation

In-situ installation is recommended only for measurements

where the gas pressure is expected to vary little, the gas is

expected to be free of contaminants, the gas temperature is

within theoperating specificationsof thesensor, and there is

no chance of liquids coalescing. Examples of applications

suited for in-situ installations are: pure gases, output of des-

iccant dryers (for instrument air), glove boxes, etc. For most

other applications in-situ installation should be avoided for

the following reasons:

• Sample conditioning is almost always necessary to

avoid exposure of the sensor to liquid water and other

contaminants, such as hydrocarbons, which may dam-

age the sensor or affect accuracy over time.

• Variations in line pressure affect the reading of the sen-

sor because dewpoint varies with pressure.

• If the gas line is under pressure, it is more likely that

water condensation occurs which may damage the sen-

sor.

8800T User’sManual

page 6

• Under a pressurized system removal of the sensor with-

out the installation of isolation valves can be dangerous.

If in-situ installation is required, bypass mounting is prefer-

able; make sure to install the sensor at the upper surface of

the gas line to minimize its exposure to liquid water, should

condensation occur, the XTR65W sensor is best suited for

these applications. Also consider the need to isolate (depres-

surize) before installing or removing the sensor.

Main

Gas Line

8800T

4-20mA loop cable

Safety shut-off Valve

Bypass

Control

Valve *

Safety shut-off Valve

Bypass Installation, Sensor

Measuring at Line Pressure

In-Line Installation, Sensor

Measuring at Line Pressure

Main

Gas Line

4-20mA loop cable

oint Transmitter

Think

Safety

Read

Manual

www.xentaur.com NOT RECOMMENDED

Sample Cell

oint Transmitter

Think

Safety

Read

Manual

www.xentaur.com

* maintain differential pressure to provide adequate flow through sample cell

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