GE Sensing MMS 35 Operating Manual
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.
iv
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
v
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
vi
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-
27
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
P
AUX
IN
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
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.
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
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.
2-16 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
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