GE Sensing MMS 35 Operating Manual

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GE Infrastructure

Sensing

Moisture Monitor Series 35

Single-Channel Hygrometer

User’s Manual

GE Infrastructure

Sensing

Moisture Monitor Series 35

Single-Channel Hygrometer

User’s Manual

910-140E September 2004

September 2004

Warranty

Each instrument manufactured by GE Infrastructure Sensing, Inc. is warranted to be free from defects in material and workmanship. Liability under this warranty is limited to restoring the instrument to normal operation or replacing the instrument, at the sole discretion of GE Infrastructure Sensing, Inc. Fuses and batteries are specifically excluded from any liability. This warranty is effective from the date of delivery to the original purchaser. If GE Infrastructure Sensing, Inc. determines that the equipment was defective, the warranty period is:

• one year from delivery for electronic or mechanical failures

• one year from delivery for sensor shelf life

If GE Infrastructure Sensing, Inc. determines that the equipment was damaged by misuse, improper installation, the use of unauthorized replacement parts, or operating conditions outside the guidelines specified by GE Infrastructure Sensing, Inc. , the repairs are not covered under this warranty.

The warranties set forth herein are exclusive and are in lieu

of all other warranties whether statutory, express or implied (including warranties or merchantability and fitness for a particular purpose, and warranties arising from course

of dealing or usage or trade).

iii

September 2004

Return Policy

If a GE Infrastructure Sensing, Inc. instrument malfunctions within the warranty period, the following procedure must be completed:

1. Notify GE Infrastructure Sensing, Inc., giving full details of

the problem, and provide the model number and serial number of the instrument. If the nature of the problem indicates the need for factory service, GE Infrastructure Sensing, Inc. will issue a RETURN AUTHORIZATION NUMBER (RAN), and shipping instructions for the return of the instrument to a service center will be provided.

2. If GE Infrastructure Sensing, Inc. instructs you to send your

instrument to a service center, it must be shipped prepaid to the authorized repair station indicated in the shipping instructions.

3. Upon receipt, GE Infrastructure Sensing, Inc. will evaluate

the instrument to determine the cause of the malfunction.

Then, one of the following courses of action will then be taken:

• If the damage is covered under the terms of the warranty,

the instrument will be repaired at no cost to the owner and returned.

• If GE Infrastructure Sensing, Inc. determines that the

damage is if the warranty has expired, an estimate for the cost of the repairs at standard rates will be provided. Upon receipt of the owner’s approval to proceed, the instrument will be repaired and returned.

not covered under the terms of the warranty, or

September 2004

Table of Contents

Chapter 1: Features & Capabilities

Electronics Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Probes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Sample System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

User Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Chapter 2: Installing the Series 35

Choosing a Site for Best Performance . . . . . . . . . . . . . . . . . 2-2

Precautions for Moisture Probes . . . . . . . . . . . . . . . . . . . . . . 2-4

Sample System Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Installing the Sample System . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Installing a Probe in the Sample System. . . . . . . . . . . . . . . 2-9

Mounting the Electronics Unit. . . . . . . . . . . . . . . . . . . . . . . . 2-11

Making Wiring Connections to the Electronics Unit. . . . 2-12

Modified or Non-GE Panametrics Cables . . . . . . . . . 2-13

Connecting the Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Connecting the Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Connecting a Recorder Output Device. . . . . . . . . . . . 2-18

Connecting a Recorder Output Device (cont.) . . . . . 2-19

Connecting Power to the Unit. . . . . . . . . . . . . . . . . . . . 2-21

Performing an MH Calibration/Test Adjustment. . . 2-22

September 2004

Table of Contents (cont.)

Chapter 3: Operating the Series 35

Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Powering Up the Series 35 . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Entering Data into the User Program . . . . . . . . . . . . . . 3-4

Verifying and Changing Factory Setup Data. . . . . . . 3-8

Changing the Measurement Display . . . . . . . . . . . . . . . . . 3-14

Setting Up the Alarm Relays . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Enabling or Disabling the Alarms. . . . . . . . . . . . . . . . . 3-17

Selecting the Measurement Mode. . . . . . . . . . . . . . . . 3-17

Selecting the Measurement Units . . . . . . . . . . . . . . . . 3-18

Configuring the Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Setting Up a Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

Selecting the Output Signal . . . . . . . . . . . . . . . . . . . . . . 3-21

Selecting the Measurement Mode and Units. . . . . . 3-22

Setting the Zero and Span Values . . . . . . . . . . . . . . . . 3-23

Setting Up User-Defined Functions . . . . . . . . . . . . . . . . . . 3-24

Entering an Offset Value. . . . . . . . . . . . . . . . . . . . . . . . . 3-25

Entering a Constant Pressure . . . . . . . . . . . . . . . . . . . . 3-26

Entering an Automatic Calibration Interval . . . . . . .3-27

Entering a Backlight-On Time Interval . . . . . . . . . . . . 3-29

Setting Up Computer Enhanced Response. . . . . . . . 3-30

Setting Up Range Error Processing . . . . . . . . . . . . . . . 3-31

Setting Up Calibration Error Processing. . . . . . . . . . . 3-33

Entering a PPMv Constant Multiplier. . . . . . . . . . . . . . 3-34

September 2004

Table of Contents (cont.)

Chapter 4: Troubleshooting and Maintenance

Common Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Screen Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Replacing the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Removing the Circuit Board (Bench-Mount Only). . . 4-8

Removing and Replacing the EPROM (All Units) . . . . 4-9

Replacing the Circuit Board (Bench-Mount Only) . .4-10

Replacing and Recalibrating the Moisture Probes. . . . . 4-12

Testing the Alarm Relays and Recorder Output . . . . . . . 4-13

Testing the Alarm Relays . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Testing the Recorder Output . . . . . . . . . . . . . . . . . . . . . 4-15

Adjusting the Recorder Zero/Span Values . . . . . . . . . . . . 4-16

Adjusting the Recorder Zero . . . . . . . . . . . . . . . . . . . . . 4-16

Adjusting the Recorder Span. . . . . . . . . . . . . . . . . . . . . 4-19

Chapter 5: Specifications

Electronics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Moisture Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

vii

September 2004

Table of Contents (cont.)

Appendix A: Application of the Hygrometer

Moisture Monitor Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Response Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Flow Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Contaminants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

Non-Conductive Particulates . . . . . . . . . . . . . . . . . . . . . A-7

Conductive Particulates . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Corrosive Particulates . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Aluminum Oxide Probe Maintenance. . . . . . . . . . . . . . . . . . A-9

Corrosive Gases And Liquids . . . . . . . . . . . . . . . . . . . . . . . . . A-11

Materials of Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Calculations and Useful Formulas in Gas Applications.A-13

Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-13

Parts per Million by Volume . . . . . . . . . . . . . . . . . . . . . . A-14

Parts per Million by Weight . . . . . . . . . . . . . . . . . . . . . . A-15

Relative Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-15

Weight of Water per Unit Volume of Carrier Gas . .A-16

Weight of Water per Unit Weight of Carrier Gas. . .A-16

Comparison of PPMV Calculations . . . . . . . . . . . . . . .A-26

Liquid Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-27

Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-27

Moisture Content Measurement in Organic Liquids . A-

Empirical Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-34

Solids Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-40

Appendix B: Outline and Installation Drawings

Appendix C: Menu Maps

Appendix D: Data Information Sheet

Series 35 Data Information Sheet . . . . . . . . . . . . . . . . . . . . . D-2

Appendix E: Series 35 Hygrometer Spare Parts List

Appendix F: Older Version Circuit Boards

Replacing the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

viii

September 2004

Chapter 1

Features & Capabilities

The Series 35 is a microprocessor-based, single-channel hygrometer that measures moisture content in gases. The Series 35 is suitable for a wide range of process conditions requiring real-time moisture measurement. It measures dew/frost points over a range of -1 10 to +60°C (-166 to +140°F), an d comes equipped with two optional alarm relays, one fault alarm, and a single analog output.

Electronics Unit

The Series 35 is available in four configurations: rack mount, bench mount, panel mount, and NEMA-4X weatherproof.

All Series 35 configurations display measurement data on a oneline, 16-character alphanumeric LCD display screen. Users enter probe information into the unit via the programming keys on the front panel keypad (see Figure 1-1 below). The Series 35 accepts line voltages of 100, 120, 230, and 240 VAC, and can also be powered by 24VDC.

POWER

ON OFF

ENTER

ESC

AUX

Figure 1-1: Series 35 Front Panel

Features & Capabilities 1-1

September 2004

Probes

The moisture probe is the part of the system that comes in contact with the process, and is usually installed in a sample system. The Series 35 uses any M Series probe to measure dew point temperature in °C or °F. A sensor assembly is secured to the probe mount and protected with a sintered stainless steel shield (see Figure 1-2 below). Other types of shields are available.

Figure 1-2: The M Series Probe

1-2 Features & Capabilities

September 2004

Sample System

The sample system delivers a controlled sample stream at the specifications of the measurement probe. Typically, the sample system is kept very simple, with as few components as possible located upstream of the measurement probe. The sample system may include a filter to remove particulates from the sample stream and/or a pressure regulator to control the pressure of the stream. In general, stainless steel is the preferred material for all wetted parts in the sample system. The sample system is located outside of the Series 35 enclosure.

User Program

The Series 35 User Program enables you to change moisture calibration data, set up and test alarms and recorders, and select a number of user-defined program functions. The main menu programming options include:

REFERENCE, ALARMS, RECORDER, TEST, USER, and FACTORY SETUP me nus.

DP RANGE, CURVE,

All functions and features of the Series 35 User Program are discussed in Chapter 3, Operation.

Features & Capabilities 1-3

September 2004

Chapter 2

Installing the Series 35

This chapter discusses installing the Series 35 in all of its configurations. Below is a list of procedures that you must follow to install your unit.

Depending on the type of unit you have, refer to the appropriate section(s) that follow to install your Series 35 correctly.

Installing your Series 35 consists of the following procedures:

• Choosing a Site for Best Performance

• Precautions for Moisture Probes

• Sample System Guidelines

• Installing the Sample System

• Installing the Probe into the Sample System

• Mounting the Electronics Unit

• Making Wiring Connections to the Electronics Unit.

Proceed to the following sections to install your Series 35.

Installing the Series 35 2-1

September 2004

Choosing a Site for Best Performance

Before you receive your Series 35, discuss environmental and installation factors with a GE Infrastructure Sensing applications engineer or field sales person. The equipment should be suited to the application and installation site.

Before installing the unit, read the guidelines below to verify that you have selected the best installation site.

• Choose an installation site for the probes and sample systems

that is as close to the process line as possible. Avoid long lengths of connecting tubing. If long distances are unavoidable, a fast sampling by-pass loop is recommended.

• Do not install any other components, such as filters, upstream

of the probe or sample system unless instructed to do so by GE Infrastructure Sensing. Many common components, such as filters and pressure regulators, are not suitable for sample systems because they have wetted parts that may absorb or release materials such as moisture into the sample stream. They may also allow ambient contamination to enter the sample stream. In general, use stainless steel for all parts in contact with the sample.

• Observe all normal safety precautions. Use the probes within

their maximum pressure and temperature ratings.

• Although the Series 35 may not need to be accessed during

normal operation, install the electronics unit at a convenient location for programming, testing and servicing. A control room or instrument shed are typical locations.

• Locate the electronics unit away from high temperatures,

strong electrical transients, mechanical vibrations, corrosive atmospheres, and any other conditions that could damage or interfere with the Series 35 operation. See Chapter 5, Specifications, for limitations.

2-2 Installing the Series 35

September 2004

Choosing a Site for Best Performance (cont.)

•

Observe the proper cable restrictions for the probes. The M Series probes require specially shielded cable. You can locate

the M Series probes up to 600 meters (2,000 feet) from the Series 35.

• Protect the probe cables from excessive physical strain

(bending, pulling, twisting, etc.). Do not subject the cables to temperatures above +105°C (221°F) or below -40°C (-40°F). Avoid splicing the cables .

Installing the Series 35 2-3

September 2004

Precautions for Moisture Probes

The M Series probes consist of an aluminum oxide sensor located on a connector and covered by a protective stainless-steel shield.

The probe sensor materials and housing maximize durability and insure a minimum of water absorbing surfaces in the vicinity of the aluminum oxide surface. A sintered stainless-steel shield is used to protect the sensor from high flow rates and particulate matter (other shields are available). The shield should not be removed except upon advice from GE Infrastructure Sensing.

The sensor has been designed to withstand normal shock and vibration. Make sure that the active sensor surface is never touched or allowed to come into direct contact with foreign objects, since this may adversely affect performance.

Observing these precautions will result in a long and useful probe life. GE Infrastructure Sensing recommends that probe calibration be checked routinely, at one-year intervals, or as recommended by our applications engineers for your particular application.The probe measures the water vapor pressure in its immediate vicinity; therefore, readings will be influenced by its proximity to the system walls, materials of construction, and other environmental factors. The sensor can be operated under vacuum or pressure, flowing or static conditions. Observe the following environmental precautions.

a. Temperature Range: The standard probe is operable

from-110 to +70°C (-166 to 158°F).

b. Moisture Condensation: Be sure the process/ambient

temperature is at least 10°C higher than the dew/frost point temperature. If this condition is not maintained, moisture condensation could occur on the sensor or in the sample system, which will cause reading errors. If this happens, refer to the Probe Clea nin g Procedure in Appendix A.

2-4 Installing the Series 35

September 2004

Precautions for Moisture Probes (cont.)

c. Static or Dynamic Use: The sensor performs equally well

in still air or where considerable flow occurs. Its small size makes it ideal for measuring moisture conditions within completely sealed containers or dry boxes. It also performs well at gas flow rates as high as 10,000 cm/sec, and liquid flow rates up to 10 cm/sec. Refer to Appendix A for the maximum flow rates in gases and liquids.

d. Pressure: The moisture probe always senses the existing

water vapor pressure, regardless of the total ambient pressure. The moisture sensor measures water vapor under vacuum or high pressure conditions from as little as 5 microns of Hg to as high as 5,000 psi total pressure.

e. Long-Term Storage & Operational Stability: Sensors

are not affected by continuous abrupt humidity changes or damaged by exposure to saturation conditions, even when stored.

f. Freedom from Interference: The sensor is completely

unaffected by the presence of a wide variety of gases or organic liquids. Large concentrations of hydrocarbon gases, Freon™, carbon dioxide, carbon monoxide, and hydrogen have no effect on sensor water vapor indications. The sensor operates properly in a multitude of gaseous or non-conductive liquid environments.

g. Corrosive Materials: Avoid all materials that are

corrosive or otherwise damaging to aluminum or aluminum oxide. These include strongly acidic or basic materials and primary amines.

Installing the Series 35 2-5

September 2004

Sample System Guidelines

A sample system, although not mandatory, is highly recommended for moisture measurement. The purpose of a sample system is to condition or control a sample stream to within the specifications of the probe. The application requirements determine the design of the sample system. GE Infrastructure Sensing applications engineers will make recommendations based on the following general guidelines.

Typically, sample systems should be kept very simple.They should contain as few components as possible and all or most of those components should be located downstream of the measurement probe. Figure 2-1 on page 2-7 shows a simple sample system consisting of a general-purpose sample cell, a filter, and two shut-off valves, one at the inlet and one at the outlet.

The sample system components should not be made of any material that will affect measurements. A sample system may include a filter to remove particulates from the sample stream or a pressure regulator to reduce or control the pressure of the stream. However, most common filters and pressure regulators are not suitable for sample systems because they have wetted parts that may absorb or release components (such as moisture) into the sample stream. They may also allow ambient contamination to enter the sample stream In general, you should use stainless steel material for all wetted parts.

2-6 Installing the Series 35

September 2004

Sample System Guidelines (cont.)

Note: The actual sample system design is dependent on the

application requirements.

Probe Outlet

Sample C ell

Inlet

Figure 2-1: A Typical Moisture Sample System

Installing the Series 35 2-7

September 2004

Installing the Sample System

The sample system is usually fastened to a metal plate that has four mounting holes. GE Infrastructure Sensing also provides the sample system in an enclosure if requested. Outline and dimension drawings are included with all GE Infrastructure Sensing sample systems.

Follow the steps below to mount the external sample system and connect it to the process:

1. Mount the sample system plate or enclosure with four bolts, one in each corner.

2. Connect the process supply and return lines to the sample system inlet and outlet using the appropriate stainless steel fittings and tubing.

Caution!

Do not start flow through the sample system until the

probe has been properly installed.

2-8 Installing the Series 35

September 2004

Installing a Probe in the Sample System

The sample system protects the probe from any damaging elements in the process. The probe must be inserted into the cylindrical shaped container called the sample cell that is included as part of the sample system.

M2 probes have 3/4-16 straight threads with an o-ring seal to secure the probe either into the sample system or directly into the process line. Other mounts are available for special applications.

Caution!

If mounting the probe directly into the process line,

consult GE Infrastructure Sensing for proper installation

instructions and precautions.

Follow the steps below to install the probe into the external sample cell.

1. Insert the probe into the sample cell so it is perpendicular to the sample inlet.

2. Screw the probe into the receptacle fitting, making sure not to cross the threads.

3. Tighten the probe securely.

Note: Do not over-tighten the probe, or the o-ring seal may be

damaged.

Figure 2-2 on page 2-10 shows a typical probe installation, with the probe mounted in a sample cell.

Note: For maximum protection of the aluminum oxide moisture

sensor, the protective shield should always be left in place.

Installing the Series 35 2-9

September 2004

Installing a Probe in the Sample System (cont.)

Probe

Inlet

Sample Cell

Outlet

Figure 2-2: A Typical Probe Installation

2-10 Installing the Series 35

September 2004

Mounting the Electronics Unit

The rack mount Series 35 may be mounted into a standard 19” rack, the panel mount Series 35 may be mounted into a rectangular cutout on most instrument panels, and the weatherproof Series 35 may be mounted on any vertical wall. See Appendix B, Outline and Installation Drawings, for details.

To install the panel-mount unit:

1. Remove the nuts and washers from the four mounting screws on the front panel of the unit.

2. Slide the unit into the panel cutout.

3. Install the washers and nuts on the mounting bolts, and tighten

them securely.

To install the rack-mount unit:

1. Insert four mounting screws into the front panel of the unit.

2. Slide the unit into the rack.

3. From behind the rack, install the washers and nuts on the

mounting screws and tighten them securely.

To install the weatherproof unit:

1. Position the unit against a flat, vertical mounting surface (i.e., a structure wall). Mark and drill appropriate size holes to accommodate the mounting bolts.

2. Insert the four mounting bolts into the four mounting holes of the weatherproof enclosure.

3. Place the enclosure against the mounting surface so that the four bolts enter the pre-drilled holes. From behind the mounting surface, install washers and nuts on the mounting bolts and tighten them securely .

Installing the Series 35 2-11

September 2004

Making Wiring Connections to the Electronics Unit

This section covers the following topics:

• precautions for modified or non-GE Infrastructure Sensing

cables

• connecting the probe

• connecting the alarms

• connecting a recorder output device

• connecting an auxiliary input

• connecting power to the unit

• performing an MH/calibration test adjustment

IMPORTANT: To maintain good contact at each terminal block

and to avoid damaging the pins on the connector, pull the connector straight off (not at an angle), make cable connections while the connector is away from the unit, and push the connector straight on (not at an angle) when the wiring is complete.

2-12 Installing the Series 35

September 2004

Modified or Non-GE Infrastructure Sensing Cables

Many customers must use pre-existing cables, or in some cases, modify the standard GE Infrastructure Sensing-supplied moisture cable to meet special needs. If you prefer to use your own cables or to modify our cables, observe the precautions listed below. In addition, after connecting the moisture probe, you must perform a calibration adjustment as described on 22 to compensate for any electrical offsets.

IMPORTANT: GE Infrastructure Sensing cannot guarantee

operation to the specified accuracy of the Series 35 unless you use GE Infrastructure Sensingsupplied hygrometer cables.

• Use cable that matches the electrical characteristics of the GE

Infrastructure Sensing cable (contact the factory for specific information on cable characteristics). The cable must have individually shielded wire pairs. A single overall shield is incorrect.

• If possible, avoid all splices. Splices impair performance.

When possible, instead of splicing, coil the excess cable.

• If you must splice cables, be sure the splice introduces

minimum resistive leakage or capacitive coupling between conductors.

• Carry the shield through any splice. A common mistake is to

not connect the shields over the splice. If you are modifying a GE Infrastructure Sensing cable, the shield will not be accessible without cutting back the cable insulation. Also, do not ground the shield at both ends. Only ground the shield at the hygrometer end of the cable.

Installing the Series 35 2-13

September 2004

Connecting the Probe

The moisture probe must be connected to the Series 35 electronics with a continuous run of GE Infrastructure Sensing two-wire shielded cable (see Figure 2-3 below).

Red

Shield

Green

Figure 2-3: Two-Wire Shielded Cable

Be sure to protect cables from excessive strain (bending, pulling, etc.) Do not subject cables to temperatures above +105°C (221°F) or below -40°C (-40°F). Standard cable assemblies (including connectors) can be ordered from GE Infrastructure Sensing in any length up to 600 meters (2,000 feet).

Follow the steps below to connect the probe to the electronics:

1. Make sure the power is disconnected from the Series 35.

2. Connect the probe cable to the terminal block on the Series 35

electronics, as shown in Table 2-4 on page 2-15 and the interconnection diagrams in Appendix B.

3. Connect the cable to the probe by inserting the bayonet-type connector onto the probe and twisting the shell clockwise until it snaps into a locked position.

2-14 Installing the Series 35

September 2004

Connecting the Probe (cont.)

IMPORTANT: To maintain good contact at each terminal block

Table 2-4: Probe Connections

Connect: To PROBE Terminal Block:

Red (H2) wire pin #1

Shield pin #2

Green (H1) wire pin #3

Installing the Series 35 2-15

September 2004

Connecting the Alarms

The Series 35 has one fault alarm, and two optional alarms that can be configured as high or low; that is, the contacts can be programmed to trip when the measured reading is over or under the alarm setpoint. The fault alarm, if enabled, will trip when there is a power failure, when a calibration error or a range error occurs, when there is a signal fault, or when the system is reset by the watchdog function.

Note: The Watchdog Function is a supervisory circuit that

automatically resets the User Program in the event of a system error (see Setting Up Alarm Relays in Chapter 3).

Connecting the High and Low Alarms

The Series 35 has optional dual alarm relays available. Hermetically-sealed alarm relays are also optionally available. Each alarm relay is a single-pole, double throw contact set that has the following contacts:

• Normally Open (NO)

• Armature Contact (A)

• Normally Closed (NC)

Make connections to Alarm relays A and B using the terminal block on the Series 35, as shown in Table 2-5 on page 2-17 and the interconnection diagrams in Appendix B.

Note: For Eur opean applicatio ns, the voltage levels at the alarm

contacts must be less than 100 VRMS.

IMPORTANT: To maintain good contact at each terminal block

2-16 Installing the Series 35

September 2004

Connecting the Alarms (cont.)

Table 2-5: High & Low Alarm Connections

Connect Alarm A: To ALARM A Terminal Block:

NC Contact pin #4 NO Contact pin #5

A Contact pin #6

Connect Alarm B: To ALARM B Terminal Block:

NC Contact pin #7 NO Contact pin #8

A Contact pin #9

Connecting the Fault Alarm

The fault alarm connections are on the “OUT” connector, pins 1, 2, and 3. Pins 1 and 3 provide a “normally closed” contact. When the Series 35 is operating in a non-fault state, the contact between pins 1 and 3 is energized (open) to remain open. When a fault occurs or power is lost, the contact between pins 1 and 3 is deenergized (closed). Pins 2 and 3 work in the opposite way. (Refer to Chapter 3, Operating the Series 35, to enable the fault alarm.)

Make connections to the fault alarm relay using the terminal block on the back of the Series 35 (or on the side of a benchmount unit), as shown in T able 2-6 below and the interconnection diagrams in Appendix B.

Table 2-6: Fault Alarm Connections

Connect Fault Alarm: To FAULT ALARM Terminal Block:

NC Contact pin #1

NO Contact pin #2

A Contact pin #3

Note: For Eur opean applicatio ns, the voltage levels at the alarm

contacts must be less than 100 VRMS.

Installing the Series 35 2-17

September 2004

Connecting a Recorder Output Device

IMPORTANT: The following instructions apply to Series 35

models with Output Board 703-1 175. For models with Output Board 703-1180, see Appendix F.

The Series 35 has one recorder output, which is isolated. This output provides either a current or voltage signal, which is set using switch S1 on the output circuit board (see Figure 2-7 on page 2-19 for the location of S1 ).

Although this switch is normally set at the factory to provide a current output signal, the setting should be checked before making any recorder output connections.

Use the following sections to check or reset the S1 setting and connect an output device.

Checking or Resetting Switch S1

1. Turn off the Series 35 and disconnect power before opening the unit.

!WARNING!

YOU MUST TURN OFF AND UNPLUG THE SERIES 35

BEFORE YOU CONTINUE WITH THE FOLLOWING STEPS.

2. T o access the output circuit board, remove the screws from the

Series 35 enclosure and remove the cover.

3. Locate switch S1 on the output circuit board (see Figure 2-7 on page 2-19).

4. Set switch S1 to the appropriate position: “I” for current output or “V” for voltage output.

5. Replace the enclosure cover and install the screws.

2-18 Installing the Series 35

September 2004

Connecting a Recorder Output Device (cont.)

Switch S1

Figure 2-7: S1 Location on 703-1175 Output Board

Installing the Series 35 2-19

September 2004

Connecting a Recorder Output Device (cont.)

IMPORTANT: To maintain good contact at each terminal block

Connecting an Output Device

After you check or reset the switch S1 setting, you can connect a recorder, computer, or other suitable device to the terminal block on the back of the Series 35 (or on the side of a bench-mount unit), as shown in T able 2-4 on page 2-20 and the interconnectio n diagrams in Appendix B.

Table 2-8: Recorder Output Connections

Connect: To REC OUT Terminal Block:

Out (+) pin #10

Return (-) pin #11

Connecting an Auxiliary Input

The Series 35 can accept one auxiliary input. Connect the input to the IN terminal block as shown in Table 2-5 below and the interconnection diagrams in Appendix B.

Table 2-9: Auxiliary Input Connections

Connect: To IN Terminal Block:

Out (+) pin #7

Return (-) pin #8

Power (+V) pin #9

2-20 Installing the Series 35

September 2004

Connecting Power to the Unit

GE Infrastructure Sensing supplies a molded plug and cord for AC power connections in rack, bench and panel mount units; however, you must supply the p ower cable for 24 VDC units and weatherproof units.

Refer to the interconnection diagrams in Appendix B to make AC and DC power connections to the Series 35 electronics.

After you make power connections to the electronics unit, connect the power cord to an appropriate source, and turn the

power on. The Series 35 displays “Loading....” while it initializes,

then returns to whatever it displayed when it was last turned off.

!WARNING!

IF YOU HAVE A DIVISION 2 UNIT, DO NOT MAKE OR

BREAK ELECTRICAL CONNECTIONS IN A HAZARDOUS

ENVIRONMENT.

IMPORTANT: For compliance with the European Union’s Low

Voltage Directive (IEC 61010), this unit requires an external power disconnect device such as a switch or circuit breaker. The disconnect device must be marked as such, clearly visible, directly accessible, and located within 1.8 m (6 ft.) of the MMS 35. The power cord is the main disconnect device.

Installing the Series 35 2-21

September 2004

Performing an MH Calibration/Test Adjustment

If you modify the supplied cables or do not use standard GE Infrastructure Sensing-supplied cables, you must perform a calibration test/adjustment to test the cable and, if necessary, compensate for any error or offset introduced by splicing or long cable lengths. This procedure is also recommended for testing the installation of GE Infrastructure Sensing cables.

Use the following steps to perform a calibration adjustment:

Preliminary Steps:

1. Power up the Series 35.

2. Set up the screen to display MH.

3. Make sure high, low and zero reference values are recorded on

the sticker located on the inside chassis of the Series 35, or on the Data Information Sheet provided in Appendix D.

Calibration Procedure:

1. Disconnect the probe from the cable (leave the probe cable connected to the Series 35) and verify that the displayed MH value equals the zero reference value within ±0.0003 MH.

a. If this reading is within specification, no further testing is

necessary.

b. If the reading is less than the specified reading (previous

recorded zero reference value ±0.0003 on sticker), add this difference to the low reference value.

c. If the reading is greater than the specified reading

(previous recorded zero reference value ±0.0003 on sticker), subtract this difference from the low reference value.

2. Note the final corrected low reference value and record it

2-22 Installing the Series 35

September 2004

Performing an MH Calibration/Test Adjustment (cont.)

3. Reprogram the Series 35 with the new (corrected) low

reference value (if required), as described in “Entering Moisture Reference Values” on page 3-13.

4. Verify that the probe cable is not connected to the probe.

5. Note the zero reference readings and verify that the readings

are now within ±0.0003 MH.

6. Fill out a new high and low reference sticker with the final low reference value and/or record the information on the Data Information Sheet provided in Appendix D. Make sure you record the information below:

HIGH REF = ORIGINAL VALUE LOW REF = NEW CORRECTED VALUE ZERO REF=ORIGINAL RECORDED VALUE

7. Reconnect the cable to the probe.

Note: If the cables are ever changed in any way, repeat this

procedure for maximum accuracy.

The Series 35 is now ready for operation. Proceed to Chapter 3, Operating the Series 35, for instructions.

Installing the Series 35 2-23

September 2004

Chapter 3

Operating the Series 35

The Series 35 has been factory-programmed and set up to begin taking measurements as soon as it is powered on. This chapter describes starting the unit and beginning operation of the unit as quickly as possible. In addition, setting up the alarm relays, a recorder, and the user-defined functions are covered.

This chapter explains the following specific procedures. Proceed to the appropriate section to operate the Series 35.

• Getting Started - Use this section to get the Series 35 operating

as quickly as possible.

• Changing the Measurement Display - Use this section to set up

the display screen for the desired measurement.

• Setting Up Alarm Relays - Use this section to enable the fault

alarm or to set up the optional high and low alarm relays.

• Setting Up a Recorder - Use this section to set up a recorder

output device.

• Setting Up User-Defined Functions - Use this section to define

and set up a variety of program functions to enhance the usability of the Series 35.

Operating the Series 35 3-1

September 2004

Getting Started

Since the calibration data has already been set up at the factory, you can begin taking measurements as soon as you power up the Series 35. Proceed to the appropriate section to power up your unit and verify that it is working correctly:

• Powering up the Series 35

• Entering Data into the User Program

• Verifying and Changing Factory Setup Data

To set up alarms, set up a recorder device, change the setup data, or configure the display, see the instructions on page 3-4 to learn how to use the Series 35 keypad for entering data into the User Program.

3-2 Operating the Series 35

September 2004

Powering Up the Series 35

After making the power connections to the electronics unit as described in Chapter 2, Installing the Series 35, connect the power cord to an appropriate power source. To power up the Series 35, flip the front panel, to the

IMPORTANT: Weatherproof MMS 35 units have no power

IF YOU HAVE A DIVISION 2 UNIT, DO NOT MAKE OR

BREAK ELECTRICAL CONNECTIONS IN A HAZARDOUS

Immediately after the power is applied, the Series 35 displays the

“Loading...” message to indicate that the system is loading

calibration and reference data. After this data is loaded, the Series 35 automatically calibrates (Autocal) the moisture circuitry . After the Autocal finishes, the Series 35 display returns to whatever it displayed when it was last powered down.

POWER switch, located on the left side of the

ON position.

switch, and the power switch on Division 2 modified units is disabled. Both units power up as soon as line power is applied.

!WARNING!

ENVIRONMENT.

Operating the Series 35 3-3

September 2004

Entering Data into the User Program

The Series 35 User Program allows you to change factory set-u p data, set up alarms and a recorder output device, and set up userdefined program functions. In order to enter and exit the User Program, move through the main menus, and enter numeric data into the User Program, you must first learn how to use the programming keys located on the front panel of the Series 35.

Use the appropriate sections that follow to learn how to enter data into the User Program.

Using the Programming Keys

The front panel of the Series 35 contains the following four keys for entering data into the User Program:

• ENTER - Use this key to select a menu option, to switch from

viewing to editing data, to move to the next digit position during numeric entry, and to confirm an entry.

• ESC - Use this key to cancel an entry and to back out of a

menu option.

• U - Use this key to scroll upward through the menu options,

and to increase the value during numeric entry.

• V - Use this key to scroll downward through the menu

options, and to decrease the value during numeric entry.

3-4 Operating the Series 35

Entering and Exiting the User Program

September 2004

This section describes how to use the

[ENTER] and [ESC] keys to

enter and exit the User Program. Refer to Table 3-1 below for the key sequence for entering the User Program main menu.

Note: The first two steps must be performed within 5 seconds of

each other or the unit will time out and return to displaying measurements.

Table 3-1: Entering the User Program

Press These Keys: To Display:

[ESC]

2. [ENTER], [ESC]

To exit the User Program, press the displays. Then press the

[ENTER] key to return to displaying

PROGRAM MENU

displays for 1 sec, then:

[ESC] key until RUN?

ESC

DP RANGE

measurements.

Operating the Series 35 3-5

September 2004

Moving Through the User Program

Use the arrow keys to scroll through the eight Main Menu opt ions as follows (refer to the menu maps in Appendix C as a guide):

• DP RANGE - use to enter high and low dew points for the

calibration curve

• CURVE - use to enter a value for each point on the calibration

curve

• REFERENCE - use to enter high and low reference values for

moisture measurement

• ALARMS - use to set up the high, low, and fault alarms

• RECORDER - use to set up the recorder output range,

measurement mode, and zero/span values

• TEST - use to test and adjust the alarms and the recorder

output (see Chapter 4, Troubleshooting, for details)

• USER - use to set up user-defined program functions, such as

offset value, constant pressure, PPMv constant multiplier, Autocal interval, computer enhanced response, backlight, range and calibration error handling

• FACTORY SETUP - for factory use only

Note: While in programming mode, the Series 35 suspends

taking measurements.

3-6 Operating the Series 35

September 2004

Entering Numeric Data

To enter numbers one digit at a time, use the arrow keys to scroll to the desired number (0 to 9 or the decimal point), then press the

[ENTER] key to move to the next digit position. Repeat this

procedure until all numbers are entered.

Note: From the programming mode, once an arrow key is

pressed, you are in edit mode. Pressing

[ESC] terminates

the edit mode. While in edit mode, check all characters before pressing the

[ENTER] key to move on to the next

digit position.

Refer to the sections that follow to enter data into the User Program’s main menu options.

Operating the Series 35 3-7

September 2004

Verifying and Changing Factory Setup Data

Use this section to make sure factory setup data is correct and to make any necessary changes to the setup data.

Note: Record all calibration data on the Data Information Sheet

in Appendix D.

In order for the Series 35 to take accurate measurements, it must have the correct moisture calibration data entered into its memory. All of the necessary data has been entered into your Series 35 at the factory; however, the data should be checked for accuracy.

To verify data, check the following:

• dew point range

• calibration data

• high and low reference values

Use the appropriate sections that follow to verify and/or change the moisture calibration data.

3-8 Operating the Series 35

September 2004

Entering the Dew Point Range

The DP Range is used to enter high and low dew point values. This range is used by the Series 35 to determine the number of points on the calibration curve.

Note: The high and low dew points are listed on the Moisture

Probe Calibration Data Sheet located in the probe box.

Changing the DP Range affects the calibration data.

The default values are: Low: –110, High: +20

DP RANGE

In the main menu, use the arrow keys to scroll to this prompt,

[ENTER] key.

Hi DP

Hi DP+20°C

then press the

Use the arrow keys to scroll to

Hi DP, then press [ENTER].

Use the arrow keys to scroll to the desired dew point value, then

[ENTER].

press

Repeat this procedure to enter the low dew point value, then press

[ESC] key until you return to the main menu.

the

Operating the Series 35 3-9

September 2004

Entering Calibration Data

After entering the high and low dew point values, use the

CURVE

option to enter calibration data for the moisture probe or the auxiliary input. Refer to the appropriate section that follows to program the Series 35.

To Enter Moisture Probe Calibration Data:

Moisture probe calibration data is always taken at fixed dew point values in 10ºC intervals. After entering the high and low dew point values, the Series 35 determines the appropriate number of data points for the moisture probe, so only the MH (raw data) values need be entered. The Series 35 automatically requests the MH value for the minimum dew point and keeps requesting data in 10ºC increments until the maximum dew point is reached. The MH values are found on the Calibration Data Sheet supplied with the moisture probe.

CURVE

In the main menu, use the arrow keys to scroll to this prompt,

[ENTER] key.

MH CURVE

then press the

Use the arrow keys to scroll to

MH CURVE and press [ENTER].

ENTER MH CURVE

ENTER PROBE S/N

Use the arrow keys to scroll to

ENTER MH CURVE or

either

ENTER PROBE S/N. Press

ENTER] at your choice.

[

If you select ENTER MH CURVE:

-110°CMH 0.1890

To view the curve, pre ss the arrow keys to scroll through the values. To edit a value, press

[ENTER], then either arrow key

to delete the present value. Use the arrow and

[ENTER] keys to

change the value one digit at a time, then press

3-10 Operating the Series 35

[ENTER] twice.

September 2004

Entering Calibration Data (cont.)

Note: To abort the editing function without changing the value,

press the

[ESC] key.

Repeat this procedure for each point on the MH Curve, then press

[ESC] until you return to the CURVE menu.

If you select ENTER PROBE S/N:

xxxxxx S/N

The unit displays the current serial number. To edit the number, press an arrow key. A blinking cursor appears at the left-most digit. Use the arrow keys to scroll to the desired value, and the

[ENTER] keys to

move the cursor to the next digit. Repeat until you have entered all six serial number digits. Then

[ENTER] to confirm the

press change or [ESC] to cancel the change.

To Enter Auxiliary Input Calibration Data:

The Series 35 can have up to ten (10) calibration data points for its Auxiliary input. Each data point requires an electrical current value (0-20 mA) with a corresponding scale value.

CURVE

In the main menu, use the arrow keys to scroll to this prompt, then press the

[ENTER] key.

AUX CURVE

Operating the Series 35 3-11

Use the arrow keys to scroll to

AUX CURVE and then press the [ENTER] key.

September 2004

Entering Calibration Data (cont.)

To Enter Auxiliary Input Calibration Data (cont.):

#Aux Pts = 3

AxUnit#DecPlc 3

Edit Pt# 1

#1mA = 4.000

Use the arrow keys to scroll to the desired number of points, then press the

[ENTER] key.

Use the arrow keys to scroll to the desired number of decimal places for the scale value, then press the

[ENTER] key.

Use the arrow keys to scroll to the desired point, then press the

[ENTER] key.

Press either arrow key to delete the present mA value and enter edit mode. Use the arrow and

[ENTER] keys to enter a new

value, one digit at a time, then

[ENTER] twice.

press

#1F = +0.00

Press either arrow key to delete the present scale value and enter edit mode. Use the arrow and

[ENTER] keys to enter a new

value, one digit at a time, then

[ENTER] twice to proceed

press to the next data point.

Repeat the above procedure for each point on the Auxiliary Curve, then press

3-12 Operating the Series 35

[ESC] until you return to the main menu.

September 2004

Entering High and Low Reference Values

IMPORTANT: Do not change these reference values unless

instructed to do so by GE Infrastructure Sensing.

The Series 35 requires high and low reference values for its moisture measurement circuitry. These references are factory calibration values that are specific to each unit. They are listed on a label located on the inside of the Series 35.

REFERENCE

HYGRO REF

High REF

H2.9999

Low REF

L0.1790

In the main menu, use the arrow keys to scroll to this prompt, then press the

[ENTER] key.

Press the [ENTER] key again.

Press either arrow key to scroll

High REF edit mode, then

to the

[ENTER].

press

Use the arrow and [ENTER] keys to change the value, one digit at a time, then press

[ENTER] twice.

Press either arrow key to scroll

Low REF edit mode, then

to the press the

[ENTER] key.

Use the arrow and [ENTER] keys to change the value, one digit at a time, then press the [ENTER] key twice.

Note: To abort the editing function without changing the value,

press the [ESC] key.

[ESC] until you return to the main menu.

Press

Operating the Series 35 3-13

September 2004

Changing the Measurement Display

Use this section to set up the Series 35 display screen for the measurement modes you want to display. The front panel of the Series 35 contains four (4) display keys that let you quickly change the measurement display during operation.

The four display keys are as follows:

• HYGRO - press this key to display and scroll through all of

the available moisture measurement units (DP/C, DP/F, PMv, MH)

• Pconst - press this key to display and scroll through all of the

available constant pressure units (PSG, Bar, KPAg, Kcmg)

• ALARM - press this key to display and scroll through the

status and set points of alarm relays A and B, as well as the status of the fault alarm relay

• AUX IN - press this key to display the auxiliary input

measurement in either milliamps (mA) or a user-defined function (XF - Auxiliary Function)

Once you select a specific display mode, that display remains on the screen until another display mode is chosen, or until you enter programming mode. Upon exiting programming mode and returning to display mode previously selected.

3-14 Operating the Series 35

RUN mode, the screen automatically returns to the

September 2004

Setting Up the Alarm Relays

The Series 35 has one fault alarm and two optional high/low alarms. Use this section to enable the fault alarm or to set up the optional high/low alarm relays. (Refer to Table 3-2 on page 3-16 for a list of possible alarm conditions.)

High/Low Alarms:

these alarm relays can be programmed to trip when the measured reading is over (high) or under (low) the alarm setpoint. To set up a high or low alarm, do the following:

• enable or disable the alarms

• set the alarm measurement mode

• set the alarm units

• configure the alarm as high or low

• set the alarm units and enter the setpoint

Fault Alarm:

To ensure failsafe operation during a power loss, the behavior of the fault alarm relay is the opposite of the high/low alarm relays. The fault alarm relay is energized under non-fault conditions, and de-energized under fault conditions.

When the Series 35 is operating in a non-fault state, the normally closed (NC) contact between pins 1 and 3 is energized to remain open. When a fault occurs or power is lost, the contact between pins 1 and 3 is de-energized and closes. The normally-open (NO) contact between pins 2 and 3 is energized closed in a non-fault state, and de-energized open when a fault occurs or power is lost.

The fault alarm, if enabled, trips during the following conditions:

• when there is a power failure

• when a calibration error or a range error occurs

Operating the Series 35 3-15

September 2004

Setting Up the Alarm Relays (cont.)

Fault Alarm (cont.):

• when there is a signal fault

• when the system is reset by the watchdog function.

Note: The Watchdog Function is a supervisory circuit that

automatically resets the User Program in the event of a system error.

Table 3-2: Possible Alarm Conditions

Alarm

Type

Cont:NCNONCNONCNO

Alarm Aopen closed closed open closed open

Alarm Bopen closed closed open closed open

Fault

Alarm

Fault

Conditions

Energized De-Energized De-Energized

closed open open closed closed open

De-Energized Energized De-Energized

Non-Fault

Conditions Loss of Power

3-16 Operating the Series 35

September 2004

Enabling or Disabling the Alarms

If alarm A or alarm B is disabled, the display returns to the alarm menu; if alarm A or alarm B is enabled, the alarm mode options are displayed. The fault alarm options are limited to the “Enable” or “Disable” choices. After the fault alarm is enabled or disabled, the display returns to the alarm menu.

Note: Be sure to record all entered output data in the Data

Information Sheet in Appendix D.

ALARMS

In the main menu, use the arrow keys to scroll to this prompt,

[ENTER] key.

Alarm A

then press the

Use the arrow keys to scroll to the desired alarm, then press

[ENTER].

Enable Alarm

Use the arrow keys to scroll to the desired choice, then press

[ENTER].

Selecting the Measurement Mode

Select “ALM HYG” if you want the alarm to respond to measurements taken from the probe input connection; select

“ALM AUX” if you want the alarm to respond to measurements

taken from the auxiliary input connection.

ALM HYG

ALM AUX

Use the arrow keys to scroll to the desired measurement option, then press

[ENTER].

Operating the Series 35 3-17

September 2004

Selecting the Measurement Units

The next set of prompts that appears depends on the alarm mode selected. Choose the units to which you want the alarm to respond. Refer to the appropriate section below and to Table 3-3 on page 3-19 for a list of the available units.

If you selected

ALM HYGDP/°F

“ALM HYG” the following prompts appear:

Use the arrow keys to scroll to the desired measurement unit,

ALM HYGDP/°C

ALM HYGDVM

ALM HYGMH

ALM HYGPMv

If you selected

then press

“ALM AUX” you can choose either a mA

[ENTER].

(milliamp) value or a user-defined XF (Auxiliary Function) value.

ALM AUXmA

Use the arrow keys to scroll to the desired value type, then

ALM AUXXF

press

[ENTER].

3-18 Operating the Series 35

Selecting the Measurement Units (cont.)

Table 3-3: Alarm/Recorder Measurement Units

Measurement Mode Units

DP/°F - dew point in °F DP/°C - dew point in °C

Hyg - Hygrometry

Aux - Auxiliary

DVM - internal voltage signal MH - raw signal from sensor PMv - parts per million by volume

mA - milliamps XF - user-defined units

September 2004

Operating the Series 35 3-19

September 2004

Configuring the Alarm

After selecting the desired measurement units, the following set of prompts appears:

Low Alarm

Use the arrow keys to choose a high or low alarm, then press

Hi Alarm

[ENTER]. (A high alarm trips

when a reading is above the setpoint, while a low alarm trips when a reading is below the setpoint.)

Note: The next prompts that appear depend on the selected

alarm measurement mode, alarm measurement units, and alarm configuration (high or low).

AL:+1.0 DP/°C

Press either arrow key to delete the current value and enter edit mode.

AL:+5.0 DP/°C

Enter the alarm setpoint. Use the arrow and

[ENTER] keys to

change the value one digit at a time, then press

[ENTER] twice.

If necessary, repeat the above procedure to set up the other alarm; then press

[ESC] until you return to the main menu.

Note: Be sure to record all entered data in the Data Information

Sheet in Appendix D.

3-20 Operating the Series 35

September 2004

Setting Up a Recorder

Use this section to set up the one Series 35 recorder output. To configure the recorder output signal, do the following:

• select the output signal in milliamps or volts

• select the recorder measurement mode and units

• set the zero and span values

Note: Be sure to record all entered output data in the Data

Information Sheet in Appendix D.

Selecting the Output Signal

Note: Be sure the output signal selected (mA or V) agrees with

the Series 35 recorder switch setting (see Making Recorder Connections in Chapter 2).

RECORDER

0-20 mA

4-20 mA

0-2 V

Operating the Series 35 3-21

In the main menu, use the arrow keys to scroll to this prompt, then press the

Use the arrow keys to scroll to the desired output range, then

[ENTER].

press

[ENTER] key.

September 2004

Selecting the Measurement Mode and Units

Selecting the Measurement Mode

“RCD HYG” if you want the recorder to respond to

Select measurements taken from the probe input connection; select

“RCD AUX” if you want the recorder to respond to measurements

taken from the auxiliary input connection.

RCD HYG

Use the arrow keys to scroll to the desired measurement mode,

RCD AUX

then press

[ENTER].

Selecting the Measurement Units

The next set of prompts that appear depends on the measurement mode selected above for the recorder output. To choose the desired recorder output measurement units, refer to the appropriate section below and Table 3-3 on page 3-19 for a list of the available measurement units.

“RCD HYG” was selected above, the following prompts appear:

RCD HYGDP/°F

Use the arrow keys to scroll to the desired measurement unit,

RCD HYGDP/°C

RCD HYGDVM

RCD HYGMH

then press

[ENTER].

RCD HYGPMv

3-22 Operating the Series 35

September 2004

Selecting the Measurement Mode and Units (cont.)

If “RCD AUX” was selected at the initial recorder prompt on page 3-22, either a mA (milliamp) output value or a user-defined XF (Auxiliary Function) output value may be chosen.

RCD AUXmA

Use the arrow keys to scroll to the desired output value, then

RCD AUXXF

press

[ENTER].

Setting the Zero and Span Values

The next set of prompts that appears depend s on the measurement mode and units previously selected for the recorder.

Ze:-80.0 DP/°C

Ze:+60.0 DP/°C

Sp:+20.0 DP/°C

Press either arrow key to delete the current zero value and enter edit mode.

Use the arrow and [ENTER] keys to change the zero value one digit at a time, then press

[ENTER] twice to proceed to the

span value.

Press either arrow key to delete the current span value and enter edit mode.

Sp:+9.0 DP/°C

Use the arrow and [ENTER] keys to change the span value one digit at a time, then press

[ENTER] twice.

[ESC] until you return to the main menu.

Press

Operating the Series 35 3-23

September 2004

Setting Up User-Defined Functions

Use this section to set up and define a variety of program functions to enhance the usability of the Series 35.

USER menu lets you set up the following program functions:

The

• Offset Value

• Constant Pressure

• Automatic Calibration Interval

• Backlight-On Time Interval

• Computer Enhanced Response (optional)

• Range Error Processing

• Calibration Error Processing

• Entering a PPMv Constant Multiplier

Use the appropriate sections that follow to set up the desired program functions.

3-24 Operating the Series 35

September 2004

Entering an Offset Value

Use this option to adjust the displayed dew/frost point reading. A positive number increases the reading, while a negative number decreases the reading. The offset value is always displayed in dew/frost point degrees C.

Note: Be sure to record all entered output data in the Data

Information Sheet in Appendix D.

USER

In the main menu, use the arrow keys to scroll to this prompt,

[ENTER] key.

OFFSET

OFFSET+5.0°C

then press the

Use the arrow keys to scroll to

“OFFSET,” then press [ENTER].

Press either arrow key to delete the current value and enter edit mode.

OFFSET+10.0°C

Use the arrow and [ENTER] keys to change the value one digit at a time, then press

After entering the offset value, press

USER menu.

[ESC] until you return to the

[ENTER] twice.

Note: The maximum positive value for the offset is +15.0°C, and

the maximum negative value is -15°C.

Operating the Series 35 3-25

September 2004

Entering a Constant Pressure

This option lets you enter a fixed value for the pressure of the sample gas at the moisture probe location. This value is used to calculate the moisture content in ppmv. Refer to Table 3-4 below for a list of the available constant pressure units.

Table 3-4: Constant Pressure Units

Available Units Description of Units

KP PSIg pounds per square inch gauge

KP Bar bars absolute KP KPAg kilopascals gauge KP Kcmg kilograms per square centimeter gauge

Note: Be sure to record all entered output data in the Data

Information Sheet in Appendix D.

CONSTANT PRESSUR

In the USER menu, use the arrow keys to scroll to this prompt, then press the

[ENTER]

key.

KPPSIg

Use the arrow keys to scroll to the desired pressure units, then

[ENTER].

press

KP:+ PSG

Press either arrow key to delete the current value and enter edit mode.

KP:+500.00 PSG

Use the arrow and [ENTER] keys to change the value one digit at a time, then press

After entering the constant pressure value, press return to the

3-26 Operating the Series 35

USER menu.

[ENTER] twice.

[ESC] until you

September 2004

Entering an Automatic Calibration Interval

The Series 35 automatically calibrates itself at user-defined intervals, to compensate for any drift in the electronics. Normally , GE Infrastructure Sensing recommends setting the Autocal interval to 480 minutes (eight hours). However, a smaller Autocal interval is beneficial if the Series 35 is exposed to extreme temperature or weather conditions. Values between 0 and 1440 minutes (14 hours) may be specified for the Autocal interval.

Note: Be sure to record all entered output data in the Data

Information Sheet in Appendix D.

AUTOCAL INTERVAL

In the USER menu, use the arrow keys to scroll to this prompt, then press the key.

ACAL (Mins)0

Press either arrow key to delete the current value and enter edit mode.

ACAL (Mins)3.0

Use the arrow and [ENTER] keys to change the value one digit at a time, then press

After entering the Autocal interval, press

USER menu.

to the

[ENTER]

[ENTER] twice.

[ESC] until you return

Operating the Series 35 3-27

September 2004

Entering an Automatic Calibration Interval (cont.)

After you confirm the Autocal interval and return to the main menu, the Series 35 immediately performs an Autocal. The next time the Autocal occurs depends on the length of the time interval setting.

The Series 35 determines the times of subsequent Autocals by establishing a fixed schedule, beginning at midnight, using the specified interval. For example, if you enter a 90-minute time interval, Autocal occurs 16 times per day (1 day = 1440 minutes ÷ 90 minutes = 16). The following fixed schedule applies:

1. 1:30 a.m. 9. 1:30 p.m.

2. 3:00 a.m. 10. 3:00 p.m.

3. 4:30 a.m. 11. 4:30 p.m.

4. 6:00 a.m. 12. 6:00 p.m.

5. 7:30 a.m. 13. 7:30 p.m.

6. 9:00 a.m. 14. 9:00 p.m.

7. 10:30 a.m. 15. 10:30 p.m.

8. 12:00 p.m.(noon) 16. 12:00 a.m.(midnight)

If you enter a time interval not evenly divisible into 1440 minutes, the Series 35 rounds up to the next acceptable interval. For example, if you set the 90-minute Autocal interval at 6:10 p.m., the next Autocal occurs at 7:30 p.m. (excluding the Autocal performed when you exit the Autocal menu).

3-28 Operating the Series 35

September 2004

Entering a Backlight-On Time Interval

If your Series 35 is equipped with a backlight, you can program the backlight to turn off automatically after a predetermined time. If the display does not have the backlight, attempts to access this option results in an

“Backlight” prompt appears. Values between 0 and 1440

the minutes (24 hours) may be entered.

“Option Not Available” message; otherwise,

BACKLIGHT

In the USER menu, use the arrow keys to scroll to this prompt, then press the key.

BLITE (Mins)0

Press either arrow key to delete the current value and enter edit mode.

BLITE (Mins)0

Use the arrow and [ENTER] keys to change the value one digit at a time, then press

After entering the Backlight interval, press

USER menu.

to the

[ENTER]

[ENTER] twice.

[ESC] until you return

Operating the Series 35 3-29

September 2004

Setting Up Computer Enhanced Response

Note: This option may not be installed on your Series 35.

Computer Enhanced Response uses a dynamic moisture calibration technique to extrapolate the moisture level to the end point, when making measurements in abrupt “dry down” conditions. The system response time depends on the relative change in dew point. For a change from ambient moisture levels to trace levels, the Series 35 can respond in under one minute.

A reasonably constant final dew point and flow rate are needed to use the computer enhanced response option. The minimum flow rate is 1 SCFH (500 cc/min).

If your Series 35 is equipped with Computer Enhanced Response, use this function to enable or disable the feature. If the enhanced response option is not available, the display will read

Avail.”

Otherwise, the Enhance Response display appears.

Note: Be sure to record all entered data in the Data Information

Sheet in Appendix D.

“Option Not

ENHANCE RESPONSE

In the USER menu, use the arrow keys to scroll to this prompt, then press the

[ENTER]

key.

ENHANCE OFF

Use the arrow keys to scroll to the desired status, then press

ENHANCE ON

[ESC] until you return to the USER menu. After you

Press activate Computer Enhanced Response, a reverse video

[ENTER].

“E”

symbol appears on the left side of the display as part of the mode. When the Series 35 determines the final value, the reverse video

“E” changes to a normal “E.”

3-30 Operating the Series 35

September 2004

Setting Up Range Error Processing

Range errors occur when an input signal that is within the capacity of the analyzer is outside the range of the probe calibration data. The Series 35 displays range errors with an

OVER RANGE or UNDER RANGE message. The error condition

extends to all displayed measurements of that mode. For example, if dew point displays PPMv also displays

OVER RANGE.

The User Program permits the selection of the manner in which errors are handled by the Series 35. To monitor the unit for error conditions, the fault alarm and/or the recorder output may be used as external indicators.

OVER RANGE, then moisture in

Refer to T able 3-5 on page 3-32 for a description of each

ERROR

option and the corresponding response of the Series 35.

RANGE

Note: Be sure to record all entered data in the Data Information

Sheet in Appendix D.

RANGE ERROR

In the USER menu, use the arrow keys to scroll to this prompt, then press the

[ENTER]

key.

R_ERR = No Response

Use the arrow keys to scroll to the desired error response mode,

R_ERR = Display

R_ERR = Hi/Lo RCD

R_ERR = Hi/Hi RCD

[ESC] until you return to the USER menu.

Press

then press

[ENTER].

Operating the Series 35 3-31

September 2004

Setting Up Range Error Processing (cont.)

Table 3-5: Range Error Response Modes

Option Display Alarm/Recorder

No Action none range error disabled

Display error displayed fault alarm tripped

fault alarm tripped, recorder output high for

Hi/Lo RCD error displayed

Hi/Hi RCD error displayed

over-range errors, recorder output low for under-range errors

fault alarm tripped, recorder output high for over-range errors, recorder output high for under-range errors

3-32 Operating the Series 35

September 2004

Setting Up Calibration Error Processing

A Calibration Error indicates a failure during measurement of the internal moisture references. During Autocal, internal references are read repeatedly, and the values measured are compared to a table of acceptable factory calibration values. Any deviation from the factory values is calculated and corrected. Should a reference value fall outside the acceptable range,

CAL ERROR message appears.

You can select whether the recorder output will be forced low (zero value) or high (span value) upon detection of a calibration error. When a calibration error is detected, the recorder output remains at the selected limit (low or high) until the error condition is corrected. Then, an Autocal is then executed or the system is restarted.

If you attempt to display data while a calibration error is in effect,

“CAL ERROR DP/°C” display appears.

the

Note: Be sure to record all entered data in the Data Information

Sheet in Appendix D.

CAL ERROR

In the USER menu, use the arrow keys to scroll to this prompt, then press the

[ENTER]

key.

CAL_ERR = Lo Output

Use the arrow keys to scroll to the desired selection, then press

CAL_ERR = Hi Output

[ESC] until you return to the USER menu.

Press

Operating the Series 35 3-33

[ENTER].

September 2004

Entering a PPMv Constant Multiplier

Use this option to apply a user-defined constant multiplier to the the PPMv value. Values up to 999.9999 may be entered.

PPMv MULTIPLIER

In the USER menu, use the arrow keys to scroll to this prompt, then press the

[ENTER]

key.

KPPMv1.0000

Press either arrow key to delete the current value and enter edit mode.

KPPMv2.0000

Use the arrow and [ENTER] keys to change the value one digit at a time, then press

[ENTER] twice.

Note: Be sure to record all entered data in the Data Information

Sheet in Appendix D.

After entering the you return to the

PPMv constant multiplier, press [ESC] until

USER menu.

3-34 Operating the Series 35

September 2004

Chapter 4

Troubleshooting and Maintenance

The Moisture Monitor Series 35 is designed to be maintenance and trouble free. Due to process conditions and other factors, however, minor problems may occur. This chapter discusses some of the most commonly encountered problems and the procedures for correcting them. If you cannot find the information you need in this chapter, contact GE Infrastructure Sensing.

Caution!

Do not attempt to troubleshoot the Series 35 beyond the

instructions in this chapter. If you do, you may damage

the unit and void the warranty.

This section includes the following information:

• Common Problems

• Screen Messages

• Replacing the User Program

• Replacing and Recalibrating the Moisture Probes

• Testing the Alarm Relays and Recorder Output

• Adjusting the Recorder Output Zero and Span Values

Common Problems

If the Series 35 measurement readings seem incorrect, there may be a problem with the probe or another system component. Table 4-1 on page 4-2 contains some of the most common measurement problems and suggested ways to resolve them.

Troubleshooting and Maintenance 4-1

4-2 Troubleshooting and Maintenance

September 2004

Table 4-1: Solutions to Common Problems

Symptom Possible Cause

Insufficient time for

system to equilibrate.

The dew point at the sampling point is

Accuracy of moisture

sensor is questioned

different than the dew point of the main stream.

Sensor or sensor shield affected by process contaminant (Appx. A).

Sensor is contaminated with conductive particles (Appendix A).

System

Response

Probe reads too

wet during dry

down, or too dry

in wet up

conditions.

Probe reads too wet or too dry.

Probe reads high dew point.

Action

Change the flow rate. A change in dew point indicates the sample system is not at equilibrium, or there is a leak. Allow sufficient time for sample system to equilibrate and moisture reading to become steady. Check for leaks.

Readings may be correct if the sampling point and main stream do not run under the same process conditions. The different process conditions cause readings to vary. Refer to Appendix A for more information. If sampling point and main stream conditions are the same, check sample system pipes, and any pipe between the sample system and main stream for leaks. Also, check sample system for adsorbing water surfaces, such as rubber or plastic tubing, paper-type filters, or condensed water traps. Remove or replace contaminating parts with stainless steel parts.

Clean the sensor and the sensor shield as described in Appendix A. Then reinstall the sensor.

Clean the sensor and the sensor shield as described in Appendix A, then reinstall the sensor. Also, install a proper filter (i.e. sintered or coalescing element).

Troubleshooting and Maintenance 4-3

Table 4-1: Solutions to Common Problems

Symptom Possible Cause

Sensor is corroded (refer to Appendix A).

Accuracy of moisture

sensor is questioned

Slow response.

Screen always reads

the wettest (highest)

programmed moisture

calibration value

while displaying dew/frost point.

Sensor temperature is greater than 70°C (158°F).

Stream particles are causing abrasion.

Slow outgassing of system.

Sensor is contaminated with non-conductive particles (Appendix A).

Probe is saturated. Liquid water is present on sensor surface and/or across electrical connections.

System

Response

Probe reads too wet or too dry.

Probe reads too dry. Return the probe to the factory for evaluation.

Probe reads too wet or too dry.

Return the probe to the factory for evaluation.

Replace the system components with stainless steel or electro-polished stainless steel.

Clean the sensor and the sensor shield as described in Appendix A. Then reinstall the sensor.

Clean the sensor and the sensor shield as described in Appendix A. Then reinstall sensor.

Action

September 2004

4-4 Troubleshooting and Maintenance

Table 4-1: Solutions to Common Problems

September 2004

Symptom Possible Cause

Shorted circuit on

Screen always reads

the wettest (highest)

programmed moisture

calibration value

while displaying

the dew/frost point.

Screen always reads

the driest (lowest)

programmed moisture

calibration value

while displaying

the dew/frost point.

sensor.

Sensor is contaminated with conductive particles (refer to Appendix A).

Improper cable connection.

Open circuit on the sensor.

Non-conductive material is trapped under the contact arm of the sensor.

Improper cable connection.

System

Response

Action

Run “dry gas” over sensor surface. If high reading persists, then probe is probably shorted and should be returned to the factory for evaluation.

Clean the sensor and the sensor shield as described in Appendix A. Then reinstall the sensor.

Check the cable connections to both the probe and the Series 35.

Return the probe to the factory for evaluation.

Clean the sensor and the sensor shield as described in Appendix A. Then reinstall the sensor. If the low reading persists, return the probe to the factory for evaluation.

Check the cable connections to both the probe and the Series 35.

September 2004

Screen Messages

The Series 35 may display several screen messages during operation. Refer to Table 4-2 on page 4-6 for a list of these messages and their possible causes and solutions.

T roubleshooting and Maintenance 4-5

4-6 Troubleshooting and Maintenance

Display Possible Cause System Response Action

(None)

“Loading...”

(reinitializes)

“Autocal...” (displays

measurement)

“CAL ERROR”

(Reads over or

under range.)

“Signal Fault”

Table 4-2: Screen Messages

Loss of Power System Shutdown Be sure power connections are

tight and unit is plugged in. Check electrical outlet.

Watchdog Reset (see Chapter 3)

Internal reference components may be out of specifications. (Occurs only when unit is set to measure DP/°C, DP/°F, ppm

Signal received is lower or higher than calibration data supplied with probe.

Electrical fault measurement signal exceeds capacity of unit.

System resets because watchdog signal is not generated within 1.6 seconds. Fault alarm is on for approximately 20 seconds.

Measurement stops for affected modes. Recorder responds as programmed (see Cal Error Processing in Chapter 3.)

System defaults to lowest or highest dew point found in calibration data. Recorder responds as programmed (refer to Range Error Processing in Chapter 3).

System defaults to highest dew point found in calibration data. Recorder responds as if programmed for an over-range error.

Call GE Infrastructure Sensing if this happens more than 5 times within ten minutes.

Check wiring. Call GE Infrastructure Sensing.

Check probe for open circuit or shorts if probe is not subjected to extreme dry or wet conditions. Contact GE Infrastructure Sensing regarding a higher calibrated probe.

Check cable connection for shorts. Check ground connections.

September 2004

Replacing the User Program

The User Program is stored on an EPROM (Erasable Programmable Read Only Memory) chip. The EPROM is located on the main circuit board (part #703-1245), which is mounted inside the Series 35 electronics unit. If your Series 35 has a part #703-1180 circuit board, also see Appendix F.

For a bench-mount unit, complete the following steps to replace the User Program:

• remove the circuit board

• remove and replace the EPROM

For a rack-mount, panel-mount, or weatherproof unit, complete the following steps to replace the User Program:

• remove the unit from its location

• remove and replace the EPROM

Refer to the appropriate sections that follow to replace the User Program.

Troubleshooting and Maintenance 4-7

September 2004

Removing the Circuit Board (Bench-Mount Only)

Note: The circuit board for the bench-mount unit is mounted on

the inside of the electronics cover.

1. Turn the power OFF and, if applicable, unplug the unit.

!WARNING!

YOU MUST TURN OFF AND UNPLUG THE SERIES 35

BEFORE CONTINUING WITH THE FOLLOWING STEPS.

2. Discharge any static electricity from your body before

touching the Series 35 enclosure.

Caution!

EPROMs can be damaged by static electricity.

3. Open the Series 35 enclosure by loosening the two quarterturn screws on the back of the unit and gently lifting the cover off, from back to front.

4. Disconnect the OUT/IN terminal block connections from the inside of the unit.

5. Remove the circuit board by unscrewing the six screws from the bracket that holds the circuit board in place.

6. Turn the circuit board over to access the EPROM.

4-8 Troubleshooting and Maintenance

September 2004

Removing and Replacing the EPROM (All Units)

1. Refer to Figure 4-3 on page 4-10 to locate the EPROM

(labeled U28) on the #703-1245 circuit board.

2. Use a chip puller to remove the EPROM. If you do not have a chip puller, use a small screwdriver to carefully wedge the chip out of its mounting. Be sure none of the EPROM’s legs get stuck in the socket.

Caution!

EPROMs can be damaged by static electricity. Take anti-

static precautions when handling EPROMs.

3. Place the new EPROM in the socket labeled U28, making sure the notch on the EPROM matches the notch on the socket (see Figure 4-3 on page 4-10).

4. If the EPROM’s legs do not enter the socket, gently remove the EPROM and place it on its side, with its legs against a flat surface. Then, gently tilt the EPROM to bend the legs slightly inward.

Caution!

Do not bend the EPROM legs too much. They are very delicate and may snap off if bent too far or too many

times.

5. Repeat Step 4 on the opposite side of the EPROM. Then, place the EPROM back in the socket, making sure the EPROM’s notch matches the socket’s notch.

6. Gently press the EPROM into place, making sure not to bend or break any of its legs. DO NOT FORCE THE EPROM INTO THE SOCKET. Repeat Steps 4 and 5 if necessary.

Troubleshooting and Maintenance 4-9

September 2004

Replacing the Circuit Board (Bench-Mount Only)

1. Replace the #703-1245 circuit board by turning it over and

remounting the bracket that holds the circuit board to the inside of the Series 35 cover.

2. Insert and tighten the six bracket screws.

EPROM

Notch

Figure 4-3: EPROM and Notch on 703-1245

4-10 Troubleshooting and Maintenance

September 2004

Replacing the Circuit Board (Bench-Mount Only) (cont.)

3. Reconnect the OUT/IN terminal block connections on the

inside of the unit.

4. Replace the Series 35 cover by attaching it to the unit, from front to back.

5. Tighten the two quarter-turn screws on the back of the unit.

Troubleshooting and Maintenance 4-11

September 2004

Replacing and Recalibrating the Moisture Probes

For maximum accuracy you should send probes back to the factory for recalibration every six months to one year, depending on the application. Under severe conditions you should send the probes back for recalibration more frequently. Contact a GE Infrastructure Sensing applications engineer for the recommended calibration frequency for your application.

When you receive new or recalibrated prob es, install and connect them as described in Installing a Probe in the Sample System in Chapter 2. Once you have installed and connected the pro bes, enter the calibration data as described in Entering Data into the

User Program in Chapter 3. Note that each probe has its own Calibration Data Sheet with the corresponding probe serial

number printed on it.

4-12 Troubleshooting and Maintenance

September 2004

Testing the Alarm Relays and Recorder Output

Use this menu option to test the alarm relays and the recorder output, and also to adjust the recorder output if necessary.

Note: Refer to Chapter 3 for instructions on how to enter and

exit the User Program and scroll to the Test Menu.

Testing the Alarm Relays

This test lets you manually trip and reset the alarm relays for testing purposes.

TEST

TEST ALARM

AlarmA ON

AlarmA OFF

AlarmB ON

AlarmB OFF

Fault Alarm ON

Fault Alarm OFF

In the main menu, use the arrow keys to scroll to this prompt, then press the

[ENTER] key.

Use the arrow keys to scroll to

TEST ALARM, then press the [ENTER] key.

Use the arrow keys to scroll to the options to trip and reset the various alarms.

Troubleshooting and Maintenance 4-13

September 2004

Testing the Alarm Relays (cont.)

As you scroll through the options, you should hear an audible click as the alarm relays change state from on to off. If an alarm or other device is connected to the alarm relay terminals, that device should also change state.

Note: If an alarm does not trip or reset, check to see if it is wir ed

correctly.

After testing and resetting the desired alarm(s), press return to the

TEST menu.

[ESC] to

4-14 Troubleshooting and Maintenance

September 2004

Testing the Recorder Output

This option lets you test the recorder output to make sure it is operating properly. You can test four percentages of the full-scale recorder range: 125%, 100%, 50%,and 0%.

TEST

In the main menu, use the arrow keys to scroll to this prompt,

[ENTER] key.

TEST RECORDER

RCD at 125%

then press the

Use the arrow keys to scroll to

TEST RECORDER, then press

[ENTER] key.

the

Use the arrow keys to scroll to the output scale options.

RCD at 100%

RCD at 50%

RCD at 0%

As you scroll through the options, the recorder pen should swing to the appropriate output value. The Series 35 automatically outputs the % of span displayed on the screen to the recorder.

Note: If the recorder needs to be adjusted, refer to the following

section.

After testing the recorder, press

[ESC] to return to the TEST

menu.

Troubleshooting and Maintenance 4-15

September 2004

Adjusting the Recorder Zero/Span Values

The measured value of the recorder output can vary from the programmed value due to resistance caused by the load (e.g., chart recorder, display, etc.) or by long wire runs or small gauge connecting wire. This menu option lets you adjust the recorder zero and span values to compensate for such variations. To accurately adjust the recorder out, you need a digital multimeter capable of measuring 0-2 volts with a resolution of ± 0.0001 VDC or 0-20 mA with a resolution of ± 0.01 mA.

Adjusting the Recorder Zero

Note: The zero adjustment is an offset adjustment, while the

span adjustment is a slope adjustment. As a result, the zero and span adjustments affect each other. Therefore, after you adjust one value you should re-adjust the other.

1. Make sure that switch S1 on the output circuit board is set to the appropriate position for the recorder output: “I” for current or “V” for voltage (see Connecting a Recorder Output Device in Chapter 2).

2. Connect the multimeter in series with the recorder terminals for a current output or in parallel with the recorder terminals for a voltage output.

3. Perform the following programming operations:

ADJUST RECORDER

In the TEST menu, use the arrow keys to scroll to this prompt, then press the

ADJ RCD ZERO

4-16 Troubleshooting and Maintenance

Use the arrow keys to scroll to

ADJ RCD ZERO, then press the [ENTER] key.

[ENTER] key.

September 2004

Adjusting the Recorder Zero (cont.)

Note: The recorder output cannot be adjusted to a value of

0.00 mA or 0.000 V due to limits imposed by electronic noise. The recor der output typically is 0.01 mA at a zero reading. Therefore, when checking for the zero value, the MMS35 automatically uses 5% of span for ranges of 0-20 mA and 0-2V (see the table below).

4. Check the multimeter reading. It should display one of the following:

Table 4-4: Recorder Zero Reading per Output Range

Recorder Output Range Desired Meter Reading

0-20 mA 1 mA 4-20 mA 4 mA

0-2 V 0.1 V

5. Adjust the recorder zero point to achieve the desired reading by performing the following operations.

ADJ RCDZ +

Press either arrow key to delete the current Recorder Adjustment Value and enter edit mode.

ADJ RCDZ -60

Use the arrow and [ENTER] keys to change the value one digit at a time; then press

[ENTER].

Any Recorder Adjustment Value (RAV) between –150 and +150 is acceptable. Each increment of the RAV adjusts the recorder output by about 0.005 mA for 0-20 and 4-20 mA outputs, or

0.0005 volts for a 0-2 V output.

T roubleshooting and Maintenance 4-17

September 2004

Adjusting the Recorder Zero (cont.)

Example:

A test of a 0-20 mA output results in a meter reading of 1.3 mA. This is 0.3 mA higher than the desired meter reading (1 mA) shown in Table 4-4 on page 4-17. Calculate the RAV that adjusts the meter reading by –0.3 mA as follows:

RAV = (–0.3 mA) (0.005 mA) = –60

Enter –60 as the new Recorder Adjustment Value (RAV).

6. Re-check the multimeter reading and, if necessary, repeat the procedure until the correct output reading is obtained.

4-18 Troubleshooting and Maintenance

September 2004

Adjusting the Recorder Span

Note: The zero adjustment is an offset adjustment, while the

span adjustment is a slope adjustment. As a result, the zero and span adjustments affect each other. Therefore, after you adjust one value you should re-adjust the other.

2. Connect the multimeter in series with the recorder terminals for a current output or in parallel with the recorder terminals for a voltage output.

3. Perform the following programming operations:

ADJUST RECORDER

In the TEST menu, use the arrow keys to scroll to this prompt,

[ENTER] key.

ADJ RCD SPAN

then press the

Use the arrow keys to scroll to

ADJ RCD SP AN, then press the [ENTER] key.

4. Check the multimeter reading. It should display one of the following (see Table 4-5 below):

Table 4-5: Recorder Span Reading per Output Range

Recorder Output Range Desired Meter Reading

0-20 mA 20 mA 4-20 mA 20 mA

0-2 V 2 V

T roubleshooting and Maintenance 4-19

September 2004

Adjusting the Recorder Span (cont.)

5. Adjust the recorder span point to achieve the desired reading

by performing the following operations.

ADJ RCDS +

Press either arrow key to delete the current Recorder Adjustment Value and enter edit mode.

ADJ RCDS +40

Use the arrow and [ENTER] keys to change the value one digit at a time; then press

[ENTER].

Any Recorder Adjustment Value (RAV) between –150 and +150 is acceptable. Each increment of the RAV adjusts the recorder output by about 0.005 mA for 0-20 and 4-20 mA outputs, or

0.0005 volts for a 0-2 V output.

Example:

A test of a 0-20 mA output results in a meter reading of 19.8 mA. This is 0.2 mA lower than the desired meter reading (20 mA) shown in the table on page 4-19. Calculate the RAV that adjusts the meter reading by +0.2 mA as follows:

RAV = (+0.2 mA) (0.005 mA) = +40

Enter +40 as the new Recorder Adjustment Value (RAV).

6. Re-check the multimeter reading and, if necessary, repeat the procedure until the correct output reading is obtained.

4-20 Troubleshooting and Maintenance

September 2004

Chapter 5

Specifications

Electronics

Functions:

Dew Point PPMv in gases at constant pressure (pressure by programmable constant)

Inputs:

Moisture:

Single input via M-Series probe connected to a terminal strip. Probe may be remotely located up to 600 m (2,000 ft) from electronic console.

Auxiliary:

4 to 20 mA input.

Intrinsic Safety:

Intrinsically safe probe and cable when used with appropriate external zener barriers. Consult GE Infrastructure Sensing for more information.

Recorder Output:

0 to 20-mA, 4 to 20-mA or 0 to 2-V analog, linear in parameter chosen.

Maximum Load:

Current Output:

500 ohms, maximum for AC units

Voltage Output:

10K ohms, minimum

Specifications 5-1

September 2004

Electronics (cont.)

Computer-Enhanced Response:

Optional.

Alarm Relays:

Fault alarm

Optional Form

Note: To maintain Low Voltage Directive Compliance,

EN Standard EN61010, the following rating applies: 2A @ 28VDC

Display Units:

Standard Hermetically

Sealed

8A @

0.3A @ 115VAC

250VAC

8A @

2A @ 28VDC

30VDC

Dew/frost point temperature: ºC, ºF PPMv Pressure: psi(g), bar, kPa(g), kg/cm2(g) MH: raw signal.

Power Requirements:

AC power supply: Specify as 100, 120, 220, or 240 VAC, 50/60 Hz

Optional DC power supply: 24 VDC Input power: 12 watts, maximum.

Temperature:

Operating: 0° to 60°C (32º to 140ºF) Storage: -20° to 70°C (-22º to 158ºF)

Configurations:

Rack-, Bench- and Panel-Mount, NEMA-4X Weatherproof

5-2 Specifications

September 2004

Electronics (cont.)

Dew/Frost Point Temperature:

Overall calibration range capability:

60° to -110°C (140º to -166ºF).

Available calibration range options:

Standard: 20 to -80°C with data to -110°C (68 to -112°F with data to -166ºF) Extended High: 60 to -80°C with data to -110°C (140 to -112ºF with data to -166ºF)

Accuracy: ±2°C from 60 to -65°C (140 to -85ºF); ±3°C from -66 to -110°C (-86 to -166ºF)

Repeatability: ±0.5°C from 60 to -65°C (140 to -85ºF); ±1.0°C from -66 to -110°C (-86 to -166ºF)

Response Time:

5 sec for 63% of a step change in moisture content in either wet up or dry down cycle.

Gas Flow Range:

From static to 10,000 cm/sec linear velocity at 1 atm

Specifications 5-3

September 2004

Moisture Measurement

Sensor Type:

GE Infrastructure Sensing M-Series thin-film aluminum oxide

Traceability:

Each sensor is individually computer-calibrated against known moisture concentrations. Calibrations are traceable to National Institute of Standards and Technology (NIST).

Temperature:

Operating and Storage: 110 to +70ºC (-166 to 158ºF)

Pressure:

Operating: 5 microns Hg to 5,000 psig

5-4 Specifications

September 2004

Appendix A

Application of the Hygrometer

This appendix contains general information about moisture monitoring techniques. System contaminants, moisture probe maintenance, process applications and other considerations for ensuring accurate moisture measurements are discussed.

The following specific topics are covered:

• Moisture Monitor Hints [page A-2]

• Contaminants [page A-7]

• Aluminum Oxide Probe Maintenance [page A-9]

• Corrosive Gases and Liquids [page A-11]

• Materials of Construction [page A-12]

• Calculations and Useful Formulas in Gas Applications

[page A-13]

• Liquid Applications [page A-27]

• Empirical Calibrations [page A-34]

• Solid Applications [page A-40]

Application of the Hygrometer A-1

September 2004

Moisture Monitor Hints

GE Infrastructure Sensing hygrometers, using aluminum oxide moisture probes, have been designed to reliably measure the moisture content of both gases and liquids. The measured dew point will be the real dew point of the system at the measurement location and at the time of measurement. However, no moisture sensor can determine the origin of the measured moisture content. In addition to the moisture content of the fluid to be analyzed, the water vapor pressure at the measurement location may include components from sources such as: moisture from the inner walls of the piping; external moisture through leaks in the piping system; and trapped moisture from fittings, valves, filters, etc. Although these sources may cause the measured dew point to be higher than expected, it is the actual dew point of the system at the time of measurement.

One of the major advantages of the GE Infrastructure Sensing hygrometer is that it can be used for in situ measurements (i.e. the sensor element is designed for installation directly within the region to be measured). As a result, the need for complex sample systems that include extensive piping, manifolds, gas flow regulators and pressure regulators is eliminated or greatly reduced. Instead, a simple sample system to reduce the fluid temperature, filter contaminants and facilitate sensor removal is all that is needed.

Whether the sensor is installed in situ or in a remote sampling system, the accuracy and speed of measurement depend on the piping system and the dynamics of the fluid flow . Response times and measurement values will be affected by the degree of equilibrium reached within system. Factors such as gas pressure, flow rate, materials of construction, length and diameter of piping, etc. will greatly influence the measured moisture levels and the response times.

Assuming that all secondary sources of moisture have been eliminated and the sample system has been allowed to come to equilibrium, then the measured dew point will equal the actual dew point of the process fluid.

A-2 Application of the Hygrometer

September 2004

Moisture Monitor Hints (cont.)

Some of the most frequently encountered problems associated with moisture monitoring sample systems include:

• the moisture content value changes as the total gas pressure

changes

• the measurement response time is very slow

• the dew point changes as the fluid temperature changes

• the dew point changes as the fluid flow rate changes.

GE Infrastructure Sensing hygrometers measure only water vapor pressure. In addition, the instrument has a very rapid response time and it is not affected by changes in fluid flow rate. If any of the above situations occur, then th ey are almost always caused by a defect in the sample system. The moisture sensor itself can not lead to such problems.

Application of the Hygrometer A-3

September 2004

Pressure

GE Infrastructure Sensing hygrometers can accurately measure dew points under pressure conditions ranging from vacuums a s low as a few microns of mercury up to pressures of 5000 psig. The calibration data supplied with the moisture probe is directly applicable over this entire pressure range, without correction.

Note: Although the moisture probe calibration data is supplied

as meter reading vs. dew point, it is important to remember that the moisture probe responds only to water vapor pressure.

When a gas is compressed, the partial pressures of all the gaseous components are proportionally increased. Conversely, when a gas expands, the partial pressures of the gaseous components are proportionally decreased. Therefore, increasing the pressure on a closed aqueous system will increase the vapor pressure of the water, and hence, increase the dew point. This is not just a mathematical artifact. The dew point of a gas with 1000 PPMv of water at 200 psig will be considerably higher than the dew point of a gas with 1000 PPMv of water at 1 atm. Gaseous water vapor will actually condense to form liquid water at a higher temperature at the 200 psig pressure than at the 1 atm pressure. Thus, if the moisture probe is exposed to pressure changes, the measured dew point will be altered by the changed vapor pressure of the water.

It is generally advantageous to operate the hygrometer at the highest possible pressure, especially at very low moisture concentrations. This minimizes wall effects and results in higher dew point readings, which increases the sensitivity of the instrument.

A-4 Application of the Hygrometer

September 2004

Response Time

The response time of the GE Infrastructure Sensing standard M Series Aluminum Oxide Moisture Sensor is very rapid - a step change of 63% in moisture concentration will be observed in approximately 5 seconds. Thus, the observed response time to moisture changes is, in general, limited by the response time of the sample system as a whole. Water vapor is absorbed tenaciously by many materials, and a large, complex processing system can take several days to “dry down” from atmospheric moisture levels to dew points of less than -60°C. Even simple systems consisting of a few feet of stainless steel tubing and a small chamber can take an hour or more to dry down from dew points of +5°C to -70°C. The rate at which the system reaches equilibrium will depend on flow rate, temperature, materials of construction and system pressure. Generally speaking, an increase in flow rate and/or temperature will decrease the response time of the sample system.

To minimize any adverse affects on response time, the preferred materials of construction for moisture monitoring sample systems

are stainless steel, Teflon include rubber elastomers and related compounds.

and glass. Materials to be avoided

Temperature

The GE Infrastructure Sensing hygrometer is largely unaffected by ambient temperature. However, for best results, it is recommended that the ambient temperature be at least 10°C higher than the measured dew point, up to a maximum of 70°C. Because an ambient temperature increase may cause water vapor to be desorbed from the walls of the sample system, it is possible to observe a diurnal change in moisture concentration for a system exposed to varying ambient conditions. In the heat of the day, the sample system walls will be warmed by the ambient air and an off-gassing of moisture into the process fluid, with a corresponding increase in measured moisture content, will occur. The converse will happen during the cooler evening hours.

Application of the Hygrometer A-5

September 2004

Flow Rate

GE Infrastructure Sensing hygrometers are unaffected by the fluid flow rate. The moisture probe is not a mass sensor but responds only to water vapor pressure. The moisture probe will operate accurately under both static and dynamic fluid flow conditions. In fact, the specified maximum fluid linear velocity of 10,000 cm/sec for The M Series Aluminum Oxide Moisture Sensor indicates a mechanical stability limitation rather than a sensitivity to the fluid flow rate.

If the measured dew point of a system changes with the fluid flow rate, then it can be assumed that off-gassing or a leak in the sample system is causing the variation. If secondary moisture is entering the process fluid (either from an ambient air leak or the release of previously absorbed moisture from the sample system walls), an increase in the flow rate of the process fluid will dilute the secondary moisture source. As a result, the vapor pressure will be lowered and a lower dew point will be measured.

Note: Refer to the Specifications chapter in this manual for the

maximum allowable flow rate for the instrument.

A-6 Application of the Hygrometer

September 2004

Contaminants

Industrial gases and liquids often contain fine particulate matter. Particulates of the following types are commonly found in such process fluids:

• carbon particles

• salts

• rust particles

• polymerized substances

• organic liquid droplets

• dust particles

• molecular sieve particles

• alumina dust

For convenience, the above particulates have been divided into three broad categories. Refer to the appropriate section for a discussion of their effect on the GE Infrastructure Sensing moisture probe.

Non-Conductive Particulates

Note: Molecular sieve particles, organic liquid droplets and oil

droplets are typical of this category.

In general, the performance of the moisture probe will not be seriously hindered by the condensation of non-conductive, noncorrosive liquids. However, a slower response to moisture changes will probably be observed, because the contaminating liquid barrier will decrease the rate of transport of the water vapor to the sensor and reduce its response time.

Particulate matter with a high density and/or a high flow rate may cause abrasion or pitting of the sensor surface. This can drastically alter the calibration of the moisture probe and, in extreme cases, cause moisture probe failure. A stainless steel shield is supplied with the moisture probe to minimize this effect, but in severe cases, it is advisable to install a Teflon® or stainless steel filter in the fluid stream.

Application of the Hygrometer A-7

September 2004

Non-Conductive Particulates (cont.)

On rare occasions, non-conductive particulate material may become lodged under the contact arm of the sensor, creating an open circuit. If this condition is suspected, refer to the Probe Cleaning Procedure section of this appendix for the recommended cleaning procedure.

Conductive Particulates

Note: Metallic particles, carbon particles and conductive l iquid

droplets are typical of this category.

Since the hygrometer reading is inversely proportional to the impedance of the sensor, a decrease in sensor impedance will cause an increase in the meter reading. Thus, trapped conductive particles across the sensor leads or on the sensor surface, which will decrease the sensor impedance, will cause an erroneously high dew point reading. The most common particulates of this type are carbon (from furnaces), iron scale (from pipe walls) and glycol droplets (from glycol-based dehydrators).

If the system contains conductive particulates, it is advisable to install a Teflon® or stainless steel filter in the fluid stream.

Corrosive Particulates

Note: Sodium chloride and sodium hydroxide particulates are

typical of this category.

Since the active sensor element is constructed of aluminum, any material that corrodes aluminum will deleteriously affect the operation of the moisture probe. Furthermore, a combination of this type of particulate with water will cause pitting or severe corrosion of the sensor element. In such instances, the sensor cannot be cleaned or repaired and the probe must be replaced.

Obviously, the standard moisture probe can not be used in such applications unless the complete removal of such part by adequate filtration is assured.

A-8 Application of the Hygrometer

GE Sensing MMS 35 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Chapter 1

Features & Capabilities

Electronics Unit

Figure 1-1: Series 35 Front Panel

Probes

Figure 1-2: The M Series Probe

Sample System

User Program

Chapter 2

Installing the Series 35

Choosing a Site for Best Performance

Precautions for Moisture Probes

Sample System Guidelines

Figure 2-1: A Typical Moisture Sample System

Installing the Sample System

Installing a Probe in the Sample System

Figure 2-2: A Typical Probe Installation

Mounting the Electronics Unit

Making Wiring Connections to the Electronics Unit

Modified or Non-GE Infrastructure Sensing Cables

Connecting the Probe

Figure 2-3: Two-Wire Shielded Cable

Table 2-4: Probe Connections

Connecting the Alarms

Table 2-5: High & Low Alarm Connections

Table 2-6: Fault Alarm Connections

Connecting a Recorder Output Device

Connecting a Recorder Output Device (cont.)

Figure 2-7: S1 Location on 703-1175 Output Board

Table 2-8: Recorder Output Connections

Table 2-9: Auxiliary Input Connections

Connecting Power to the Unit

Performing an MH Calibration/Test Adjustment

Chapter 3

Operating the Series 35

Getting Started

Powering Up the Series 35

Entering Data into the User Program

Table 3-1: Entering the User Program

Verifying and Changing Factory Setup Data

Changing the Measurement Display

Setting Up the Alarm Relays

Table 3-2: Possible Alarm Conditions

Enabling or Disabling the Alarms

Selecting the Measurement Mode

Selecting the Measurement Units

Table 3-3: Alarm/Recorder Measurement Units

Configuring the Alarm

Setting Up a Recorder

Selecting the Output Signal

Selecting the Measurement Mode and Units

Setting the Zero and Span Values

Setting Up User-Defined Functions

Entering an Offset Value

Entering a Constant Pressure

Table 3-4: Constant Pressure Units

Entering an Automatic Calibration Interval

Entering a Backlight-On Time Interval

Setting Up Computer Enhanced Response

Setting Up Range Error Processing

Table 3-5: Range Error Response Modes

Setting Up Calibration Error Processing

Entering a PPMv Constant Multiplier

Chapter 4

Troubleshooting and Maintenance

Common Problems

Table 4-1: Solutions to Common Problems

Screen Messages

Table 4-2: Screen Messages

Replacing the User Program

Removing the Circuit Board (Bench-Mount Only)

Removing and Replacing the EPROM (All Units)

Replacing the Circuit Board (Bench-Mount Only)

Figure 4-3: EPROM and Notch on 703-1245

Replacing and Recalibrating the Moisture Probes

Testing the Alarm Relays and Recorder Output