Model Solu Comp Xmt-P
pH, ORP, and Redox Transmitter
Instruction Manual
PN 51-Xmt-P/rev.E
October 2007
Emerson Process Management
Liquid Division
2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: (949) 757-8500
Fax: (949) 474-7250
http://www.raihome.com
© Rosemount Analytical Inc. 2006
ESSENTIAL INSTRUCTIONS
READ THIS PAGE BEFORE PROCEEDING!
Rosemount Analytical designs, manufactures, and tests its products to meet many national and international
standards. Because these instruments are sophisticated technical products, you must properly install, use, and
maintain them to ensure they continue to operate within their normal specifications. The following instructions
must be adhered to and integrated into your safety program when installing, using, and maintaining Rosemount
Analytical products. Failure to follow the proper instructions may cause any one of the following situations to
occur: Loss of life; personal injury; property damage; damage to this instrument; and warranty invalidation.
• Read all instructions prior to installing, operating, and servicing the product. If this Instruction Manual is not the
correct manual, telephone 1-800-654-7768 and the requested manual will be provided. Save this Instruction
Manual for future reference.
• If you do not understand any of the instructions, contact your Rosemount representative for clarification.
• Follow all warnings, cautions, and instructions marked on and supplied with the product.
• Inform and educate your personnel in the proper installation, operation, and maintenance of the product.
• Install your equipment as specified in the Installation Instructions of the appropriate Instruction Manual and per
applicable local and national codes. Connect all products to the proper electrical and pressure sources.
• To ensure proper performance, use qualified personnel to install, operate, update, program, and maintain the
product.
• When replacement parts are required, ensure that qualified people use replacement parts specified by
Rosemount. Unauthorized parts and procedures can affect the product’s performance and place the safe
operation of your process at risk. Look alike substitutions may result in fire, electrical hazards, or improper
operation.
• Ensure that all equipment doors are closed and protective covers are in place, except when maintenance is
being performed by qualified persons, to prevent electrical shock and personal injury.
NOTICE
If a Model 375 Universal Hart® Communicator is used with these transmitters, the software within the Model 375 may require
modification. If a software modification is required, please contact your local Emerson Process Management Service Group
or National Response Center at 1-800-654-7768.
About This Document
This manual contains instructions for installation and operation of the Model Xmt-P Two-Wire pH/ORP
Transmitter. The following list provides notes concerning all revisions of this document.
Rev. Level Date Notes
A 3/05 This is the initial release of the product manual. The manual has been
reformatted to reflect the Emerson documentation style and updated to
reflect any changes in the product offering. This manual contains
information on HART Smart and F
OUNDATION Fieldbus versions of
Model Solu Comp Xmt-P.
B 9/05 Revise panel mount drawing. Add Foundation fieldbus agency
approvals and FISCO version.
C 2/06 Revised the case specification on page 2. Added new drawings of FF
and FI on section 4.0, pages 29-46.
D 6/06 Revised Quick Start choices adding language as #5. Added Language
box to page 5. Deleted 230A in accessories chart on page 10.
E 10/07 Added M Certs to page 2.
5. Choose the desired language. Choose >> to show more choices.
6. Choose measurement: pH, ORP, or Redox.
7. Choose preamplifier location. Select Xmtr to use the integral preamplifier in the
transmitter; select Sensor/JBox if your sensor has an integral preamplifier or if
you are using a remote preamplifier located in a junction box.
8. Choose temperature units: °C or °F.
9. To change output settings, to scale the 4-20 mA output, to change measurement-related settings from the default values, and to set security codes, press
MENU. Select Program and follow the prompts. Refer to the appropriate menu
tree (page 5 or 6).
9. To return the transmitter to default settings, choose ResetAnalyzer in the
Program menu.
Measure? pH
Redox ORP
Use Preamp in?
Xmtr Sensor/JBox
Temperature in?
°C °F
1. Refer to page 11 for installation instructions.
2. Wire pH or ORP sensor to the transmitter. See Figure 2-3 for panel mount; Figure 2-4 or 2-5 for pipe or surface
mount. Refer to the sensor instruction sheet for details.
3. Once connections are secure and verified, apply power to the transmitter.
4. When the transmitter is powered up for the first time, Quick Start screens appear. Using Quick Start is easy.
a. A blinking field shows the position of the cursor.
b. Use the
t or u key to move the cursor left or right. Use the p or q key to move the cursor up or down or to
increase or decrease the value of a digit. Use the p or q key to move the decimal point.
c. Press ENTER to store a setting. Press EXIT to leave without storing changes. Pressing EXIT also returns the
display to the previous screen.
QUICK START GUIDE
FOR MODEL SOLU COMP Xmt-P TRANSMITTER
English Français
Español
>>
i
MODEL XMT-P pH/ORP TABLE OF CONTENTS
MODEL XMT-P pH/ORP TWO-WIRE TRANSMITTER
TABLE OF CONTENTS
Section Title Page
1.0 DESCRIPTION AND SPECIFICATIONS ................................................................ 1
1.1 Features and Applications........................................................................................ 1
1.2 Specifications........................................................................................................... 2
1.3 Hazardous Location Approval.................................................................................. 4
1.4 Menu Tree for Model Xmt-P-HT............................................................................... 5
1.5 Menu Tree for Model Xmt-P-FF ............................................................................... 6
1.6 HART Communications............................................................................................ 7
1.7 FOUNDATION Fieldbus .............................................................................................. 7
1.8 Asset Management Solutions ................................................................................. 8
1.9 Ordering Information ............................................................................................... 10
1.10 Accessories ............................................................................................................. 10
2.0 INSTALLATION ....................................................................................................... 11
2.1 Unpacking and Inspection........................................................................................ 11
2.2 Pre-Installation Set Up ............................................................................................. 11
2.3 Installation................................................................................................................ 13
3.0 WIRING.................................................................................................................... 17
3.1 Power Supply / Current Loop — Model Xmt-P-HT .................................................. 17
3.2 Power Supply Wiring for Model Xmt-P-FF............................................................... 18
3.2 Sensor Wiring .......................................................................................................... 19
4.0 INTRINSICALLY SAFE INSTALLATION................................................................. 20
5.0 DISPLAY AND OPERATION................................................................................... 47
5.1 Display ..................................................................................................................... 47
5.2 Keypad..................................................................................................................... 47
5.3 Programming and Calibrating the Model Xmt — Tutorial......................................... 48
5.4 Menu Trees - pH ...................................................................................................... 49
5.5 Diagnostic Messages - pH ....................................................................................... 49
5.6 Security .................................................................................................................... 52
5.7 Using Hold ............................................................................................................... 52
6.0 OPERATION WITH MODEL 375............................................................................. 53
6.1 Note on Model 375 HART and Foundation Fieldbus Communicator....................... 53
6.2 Connecting the HART and Foundation Fieldbus Communicator ............................. 53
6.3 Operation ................................................................................................................. 54
7.0 PROGRAMMING THE TRANSMITTER.................................................................. 69
7.1 General .................................................................................................................... 69
7.2 Changing Start-up Settings...................................................................................... 69
7.3 Configuring and Ranging the Output ....................................................................... 70
7.4 Choosing and Configuring the Analytical Measurement .......................................... 73
7.5 Choosing Temperature Units and Manual or Auto Temperature Compensation...... 75
7.6 Setting a Security Code ........................................................................................... 76
7.7 Making HART-Related Settings ............................................................................... 77
7.8 Noise Reduction....................................................................................................... 77
7.9 Resetting Factory Calibration and Factory Default Settings .................................... 77
7.10 Selecting a Default Screen and Screen Contrast .................................................... 78
MODEL XMT-P pH/ORP TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D
ii
8.0 CALIBRATION — TEMPERATURE........................................................................ 79
8.1 Introduction .............................................................................................................. 79
8.2 Calibrating Temperature........................................................................................... 79
9.0 CALIBRATION — pH ............................................................................................. 81
9.1 Introduction .............................................................................................................. 81
9.2 Procedure — Auto Calibration ................................................................................. 82
9.3 Procedure — Manual Two-Point Calibration............................................................ 84
9.4 Procedure — Standardization.................................................................................. 85
9.5 Procedure — Entering a Known Slope Value .......................................................... 86
9.6 ORP Calibration ....................................................................................................... 87
10.0 TROUBLESHOOTING ........................................................................................... 88
10.1 Overview .................................................................................................................. 88
10.2 Troubleshooting When a Fault or Warning Message is Showing ............................ 89
10.3 Troubleshooting When No Fault Message is Showing — Temp .............................. 92
10.4 Troubleshooting When No Fault Message is Showing — HART............................. 92
10.5 Troubleshooting When No Fault Message is Showing — pH .................................. 92
10.6 Troubleshooting Not Related to Measurement Problems ........................................ 95
10.7 Simulating Inputs — pH ........................................................................................... 95
10.8 Simulating Temperature ........................................................................................... 96
10.9 Measuring Reference Voltage.................................................................................. 97
11.0 MAINTENANCE ...................................................................................................... 98
11.1 Overview .................................................................................................................. 98
11.2 Replacement Parts .................................................................................................. 98
12.0 pH MEASUREMENTS............................................................................................. 99
12.1 General .................................................................................................................... 99
12.2 Measuring Electrode ................................................................................................ 100
12.3 Reference Electrode ................................................................................................ 100
12.4 Liquid Junction Potential .......................................................................................... 101
12.5 Converting Voltage to pH ......................................................................................... 101
12.6 Glass Electrode Slope ............................................................................................. 102
12.7 Buffers and Calibration ............................................................................................ 102
12.8 Isopotential pH ......................................................................................................... 103
12.9 Junction Potential Mismatch .................................................................................... 103
12.10 Sensor Diagnostics .................................................................................................. 104
12.11 Shields, Insulation, and Preamplifiers...................................................................... 104
continued on following page
iii
MODEL XMT-P pH/ORP TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D
13.0 ORP MEASUREMENTS.......................................................................................... 105
13.1 General .................................................................................................................... 105
13.2 Measuring Electrode ................................................................................................ 106
13.3 Reference Electrode ................................................................................................ 106
13.4 Liquid Junction Potential .......................................................................................... 106
13.5 Relating Cell Voltage to ORP................................................................................... 107
13.6 ORP, Concentration, and pH.................................................................................... 107
13.7 Interpreting ORP Measurements ............................................................................. 108
13.8 Calibration................................................................................................................ 109
14.0 THEORY — REMOTE COMMUNICATIONS........................................................... 111
14.1 Overview of HART Communications........................................................................ 111
14.2 HART Interface Devices........................................................................................... 111
14.3 Asset Management Solutions .................................................................................. 112
15.0 RETURN OF MATERIAL......................................................................................... 113
LIST OF TABLES
Number Title Page
11-1 Replacement Parts for Model Xmt-P — Panel Mount Version ................................ 98
11-2 Replacement Parts for Model Xmt-P — Pipe/Surface Mount Version ..................... 98
iv
MODEL XMT-P pH/ORP TABLE OF CONTENTS
LIST OF FIGURES
Number Title Page
1-1 Menu Tree — Xmt-P-HT........................................................................................... 5
1-2 Menu Tree — Xmt-P-FF ........................................................................................... 6
1-3 Configuring Model XMT Transmitter with FOUNDATION Fieldbus .............................. 7
1-4 HART Communicators.............................................................................................. 8
1-5 AMS Main Menu Tools ............................................................................................. 9
2-1 Removing the Knockouts ......................................................................................... 13
2-2 Power Supply / Current Loop Wiring ........................................................................ 13
2-3 Panel Mount Installation ........................................................................................... 14
2-4 Pipe Mount Installation ............................................................................................. 15
2-5 Surface Mount Installation ........................................................................................ 16
3-1 Load/Power Supply Requirements ........................................................................... 17
3-2 Power Supply / Current Loop Wiring ........................................................................ 17
3-3 Typical Fieldbus Network Electrical Wiring Configuration ........................................ 18
3-4 Loop Power and Sensor Wiring................................................................................ 18
3-5 Wiring and Preamplifier Configurations for pH and ORP Sensors ........................... 19
4-1 FM Intrinsically Safe Label for Model XMT-P-HT ..................................................... 20
4-2 FM Intrinsically Safe Installation for Model XMT-P-HT (1 of 2) ................................ 21
4-3 FM Intrinsically Safe Installation for Model XMT-P-HT (2 of 2) ................................ 22
4-4 CSA Intrinsically Safe Label for Model XMT-P-HT ................................................... 23
4-5 CSA Intrinsically Safe Installation for Model XMT-P-HT (1 of 2) .............................. 24
4-6 CSA Intrinsically Safe Installation for Model XMT-P-HT (2 of 2) .............................. 25
4-7 ATEX Intrinsically Safe Label for Model XMT-P-HT ................................................. 26
4-8 ATEX Intrinsically Safe Installation for Model XMT-P-HT (1 of 2) ............................ 27
4-9 ATEX Intrinsically Safe Installation for Model XMT-P-HT (2 of 2) ............................ 28
4-10 FM Intrinsically Safe Label for Model XMT-P-FF...................................................... 29
4-11 FM Intrinsically Safe Installation for Model XMT-P-FF (1 of 2) ................................ 30
4-12 FM Intrinsically Safe Installation for Model XMT-P-FF (2 of 2) ................................ 31
4-13 CSA Intrinsically Safe Label for Model XMT-P-FF.................................................... 32
4-14 CSA Intrinsically Safe Installation for Model XMT-P-FF (1 of 2) .............................. 33
4-15 CSA Intrinsically Safe Installation for Model XMT-P-FF (2 of 2) .............................. 34
4-16 ATEX Intrinsically Safe Label for Model XMT-P-FF.................................................. 35
4-17 ATEX Intrinsically Safe Installation for Model XMT-P-FF (1 of 2) ............................ 36
4-18 ATEX Intrinsically Safe Installation for Model XMT-P-FF (2 of 2) ............................ 37
4-19 FM Intrinsically Safe Label for Model XMT-P-FI....................................................... 38
4-20 FM Intrinsically Safe Installation for Model XMT-P-FI (1 of 2) ................................. 39
4-21 FM Intrinsically Safe Installation for Model XMT-P-FI (2 of 2) ................................. 40
4-22 CSA Intrinsically Safe Label for Model XMT-P-FI..................................................... 41
4-23 CSA Intrinsically Safe Installation for Model XMT-P-FI (1 of 2) ............................... 42
4-24 CSA Intrinsically Safe Installation for Model XMT-P-FI (2 of 2) ............................... 43
4-25 ATEX Intrinsically Safe Label for Model XMT-P-FI................................................... 44
4-26 ATEX Intrinsically Safe Installation for Model XMT-P-FI (1 of 2) ............................. 45
4-27 ATEX Intrinsically Safe Installation for Model XMT-P-FI (2 of 2) ............................. 46
5-1 Displays During Normal Operation ........................................................................... 29
5-2 Solu Comp Xmt Keypad ........................................................................................... 29
5-3 Menu Tree for Model Xmt-P-HT ............................................................................... 32
5-4 Menu Tree for Model Xmt-P-FF................................................................................ 33
6-1 Connecting the Model 375 Communicator .............................................................. 35
6-2 XMT-P-HT HART / Model 375 Menu Tree................................................................ 37
6-3 XMT-P-HT Foundation Fieldbus / Model 375 Menu Tree......................................... 39
v
9-1 Calibration Slope and Offset .................................................................................... 63
10-1 Simulate pH.............................................................................................................. 77
10-2 Three-Wire RTD Configuration................................................................................. 78
10-3 Simulating RTD Inputs ............................................................................................. 78
10-4 Checking for a Poisoned Reference Electrode ........................................................ 79
12-1 pH Measurement Cell............................................................................................... 81
12-2 Measuring Electrode (pH) ........................................................................................ 82
12-3 Cross-Section Through the pH Glass....................................................................... 82
12-4 Reference Electrode................................................................................................. 83
12-5 The Origin of Liquid Junction Potential..................................................................... 83
12-6 Glass Electrode Slope.............................................................................................. 84
12-7 Two-Point Buffer Calibration..................................................................................... 85
12-8 Liquid Junction Potential Mismatch .......................................................................... 86
13-1 ORP Measurement Cell ........................................................................................... 87
13-2 Measuring Electrode (ORP) ..................................................................................... 88
13-3 Reference Electrode................................................................................................. 88
13-4 The Origin of Liquid Junction Potential..................................................................... 89
13-5 Electrode Potential ................................................................................................... 89
13-6 ORP Measurement Interpretation............................................................................. 90
14-1 HART Communicators.............................................................................................. 93
14-2 AMS Main Menu Tools ............................................................................................. 94
MODEL XMT-P pH/ORP TABLE OF CONTENTS
LIST OF FIGURES CONT’D
Number Title Page
1
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
Model Xmt Family of Two-wire Transmitters
• CHOICE OF COMMUNICATION PROTOCOLS:
HART
®
or FOUNDATION®Fieldbus
• CLEAR, EASY-TO-READ two-line display shows commissioning menus
and process measurement displays in English
• SIMPLE TO USE MENU STRUCTURE
• CHOICE OF PANEL OR PIPE/SURFACE MOUNTING
• NON-VOLATILE MEMORY retains program settings and calibration
data during power failures
• SIX LOCAL LANGUAGES - English, French, German, Italian, Spanish and Portuguese
1.1 FEATURES AND APPLICATIONS
The Solu Comp Model Xmt family of transmitters can be
used to measure pH, ORP, conductivity (using either contacting or toroidal sensors), resistivity, oxygen (ppm and
ppb level), free chlorine, total chlorine, monochloramine
and ozone in a variety of process liquids. The Xmt is compatible with most Rosemount Analytical sensors. See the
Specification sections for details.
The transmitter has a rugged, weatherproof, corrosionresistant enclosure (NEMA 4X and IP65). The panel mount
version fits standard ½ DIN panel cutouts, and its shallow
depth is ideally suited for easy mounting in cabinet-type
enclosures. A panel mount gasket is included to maintain
the weather rating of the panel. Surface/pipe mount enclosure includes self-tapping screws for surface mounting. A
pipe mounting accessory kit is available for mounting to a
2-inch pipe.
The transmitter has a two-line 16-character display. Menu
screens for calibrating and registering choices are simple
and intuitive. Plain language prompts guide the user
through the procedures. There are no service codes to
enter before gaining access to menus.
Two digital communication protocols are available: HART
(model option -HT) and F
OUNDATION fieldbus (model option
-FF or -FI). Digital communications allow access to AMS
(Asset Management Solutions). Use AMS to set up and
configure the transmitter, read process variables, and troubleshoot problems from a personal computer or host anywhere in the plant.
The seven-button membrane-type keypad allows local programming and calibrating of the transmitter. The HART
Model 375 communicator can also be used for programming and calibrating the transmitter.
The Model Xmt-P Transmitter with the appropriate sensor
measures dissolved oxygen (ppm and ppb level), free
chlorine, total chlorine, monochloramine, and ozone in
water and aqueous solutions. The transmitter is compatible with Rosemount Analytical 499A amperometric sensors for oxygen, chlorine, monochloramine, and ozone;
and with Hx438, Bx438, and Gx448 steam-sterilizable oxygen sensors.
For free chlorine measurements, both automatic and manual pH correction are available. pH correction is necessary
because amperometric free chlorine sensors respond only
to hypochlorous acid, not free chlorine, which is the sum of
hypochlorous acid and hypochlorite ion. To measure free
chlorine, most competing instruments require an acidified
sample. Acid lowers the pH and converts hypochlorite ion
to hypochlorous acid. The Model Xmt-P eliminates the
need for messy and expensive sample conditioning by
measuring the sample pH and using it to correct the chlorine sensor signal. If the pH is relatively constant, a fixed
pH correction can be used, and the pH measurement is
not necessary. If the pH is greater than 7.0 and fluctuates
more than about 0.2 units, continuous measurement of pH
and automatic pH correction is necessary. See
Specifications section for recommended pH sensors.
Corrections are valid to pH 9.5.
The transmitter fully compensates oxygen, ozone, free
chlorine, total chlorine, and monochloramine readings for
changes in membrane permeability caused by temperature changes.
For pH measurements — pH is available with free chlorine
only — the Xmt-P features automatic buffer recognition
and stabilization check. Buffer pH and temperature data
for commonly used buffers are stored in the transmitter.
Glass impedance diagnostics warn the user of an aging or
failed pH sensor.
2
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.2 SPECIFICATIONS
1.2.1 GENERAL SPECIFICATIONS
Case:
ABS (panel mount), polycarbonate (pipe/wall mount);
NEMA 4X/CSA 4 (IP65)
Dimensions
Panel (code -10): 6.10 x 6.10 x 3.72 in. (155 x 155 x
94.5 mm)
Surface/Pipe (code -11): 6.23 x 6.23 x 3.23 in. (158
x 158 x 82 mm); see page 15 for dimensions of pipe
mounting bracket.
Conduit openings: Accepts PG13.5 or 1/2 in. conduit fit-
tings
Ambient Temperature: 32 to 122°F (0 to 50°C). Some
degradation of display above 50°C.
Storage Temperature: -4 to 158°F (-20 to 70°C)
Relative Humidity: 10 to 90% (non-condensing)
Weight/Shipping Weight: 2 lb/3 lb (1 kg/1.5 kg)
Display: Two line, 16-character display. Character height:
4.8 mm; first line shows process variable (pH, ORP,
conductivity, % concentration, oxygen, ozone, chlorine, or monochloramine), second line shows process
temperature and output current. For pH/chlorine combination, pH may also be displayed. Fault and warning messages, when triggered, alternate with temperature and output readings.
During calibration and programming, messages,
prompts, and editable values appear on the two-line
display.
Temperature resolution: 0.1°C (≤99.9°C);
1°C (≥100°C)
Hazardous Location Approval: For details, see specifi-
cations for the measurement of interest.
RFI/EMI: EN-61326
DIGITAL COMMUNICATIONS:
HART —
Power & Load Requirements: Supply voltage at the
transmitter terminals should be at least 12 Vdc.
Power supply voltage should cover the voltage
drop on the cable plus the external load resistor
required for HART communications (250 Ω minimum). Minimum power supply voltage is 12 Vdc.
Maximum power supply voltage is 42.4 Vdc. The
graph shows the supply voltage required to
maintain 12 Vdc (upper line) and 30 Vdc (lower
line) at the transmitter terminals when the current is 22 mA.
Analog Output: Two-wire, 4-20 mA output with
superimposed HART digital signal. Fully scalable
over the operating range of the sensor.
Output accuracy: ±0.05 mA
FOUNDATION FIELDBUS —
Power & Load Requirements: A power supply volt-
age of 9-32 Vdc at 13 mA is required.
Fieldbus Intrinsically Safe COncept/FISCO-compliant
versions of Model Xmt Foundation Fieldbus transmitters are available.
Solu Comp is a registered trademark of Rosemount Analytical.
Xmt is a trademark of Rosemount Analytical.
HART is a registered trademark of the HART Communication Foundation.
FOUNDATION is a registered trademark of Fieldbus Foundation.
Sira MC070113/00
3
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
pH/ORP SENSOR DIAGNOSTIC CAPABILITY
320B Glass and Reference
330B Glass and Reference
320HP-58 Glass only
328A Glass only
370 Glass only
371 Glass only
372 Glass only
381 pHE-31-41-52 Glass only
381+ Glass and Reference
385-08-53 Glass only
385+ Glass and Reference
389-02-54 / 389VP-54 Glass only
396-54-62 / 396VP Glass only
396P-55 / 396PVP-55 Glass and Reference
396R / 396RVP-54 Glass and Reference
397-54-62 Glass only
398-54-62 / 398VP-54 Glass only
398R-54-62 / 398RVP-54 Glass and Reference
399-09-62 / 399VP-09 Glass only
399-10 / 399-14 Glass only
399-33 none
Hx338 Glass only
Hx348 Glass only
TF396 none
SENSOR COMPATIBILITY CHART
3
1.2.2 FUNCTIONAL SPECIFICATIONS
pH Range: 0 to 14
ORP
Range: -1400 to +1400mV
Calibrations/standardization: The automatic buffer
recognition uses stored buffer values and their temperature curves for the most common buffer standards
available worldwide. The transmitter also performs a
stabilization check on the sensor in each buffer.
A manual two-point calibration is made by immersing
the sensor in two different buffer solutions and entering
the pH values. The microprocessor automatically calculates the slope which is used for self-diagnostics. An
error message will be displayed if the pH sensor is
faulty. This slope can be read on the display and/or
manually adjusted if desired.
An on-line one-point process standardization is accomplished by entering the pH or ORP value of a grab
sample.
Preamplifier Location: A preamplifier must be used to
convert the high impedance pH electrode signal to a low
impedance signal for transmitter use. The integral preamplifier of the Model Xmt-P may be used when the
sensor to transmitter distance is less than 15 ft (4.5 m).
Locate the preamplifier in the sensor or junction box for
longer distances.
Automatic Temperature Compensation: External 3-wire
Pt100 RTD or Pt1000 RTD located in the sensor, compensates the pH reading for temperature fluctuations.
Compensation covers the range -15 to 130°C (5 to 270°F).
Manual temperature compensation is also selectable.
Accuracy: ±1.4 mV @ 25°C ± 0.01 pH
Repeatability: ±1 mV @ 25°C ±0.01 pH
Diagnostics: The internal diagnostics can detect:
Calibration Error Sensor Failure
High Temperature Warning CPU Failure
Low Temperature Warning Input Warning
ROM Failure Glass Warning
Glass Failure Reference Warning
Reference Failure
Once one of the above is diagnosed, the display will
show a message describing the problem.
DIGITAL COMMUNICATIONS:
HART (pH): PV assigned to pH. SV, TV, and 4V
assignable to pH, temperature, mV, glass impedance, reference impedance, or RTD resistance.
HART (ORP): PV assigned to ORP. SV, TV, and 4V
assignable to ORP, temperature, reference impedance, or RTD resistance.
Fieldbus (pH): Four AI blocks assigned to pH, tem-
perature, reference impedance, and glass impedance.
Fieldbus (ORP): Three AI blocks assigned to ORP,
temperature, and reference impedance.
Fieldbus (pH and ORP): Execution time 75 msec.
One PID block; execution time 150 msec. Device
type 4085. Device revision 1. Certified to ITK 4.5.
4
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.3 HAZARDOUS LOCATION APPROVALS
Intrinsic Safety:
Class I, II, III, Div. 1
Groups A-G
T4 Tamb = 50°C
Class I, II, III, Div. 1
Groups A-G
T4 Tamb = 50°C
1180 II 1 G
Baseefa04ATEX0213X
EEx ia IIC T4
Tamb = 0°C to 50°C
Non-Incendive:
Class I, Div. 2, Groups A-D
Dust Ignition Proof
Class II & III, Div. 1, Groups E-G
NEMA 4/4X Enclosure
Class I, Div. 2, Groups A-D
Dust Ignition Proof
Class II & III, Div. 1, Groups E-G
NEMA 4/4X Enclosure
T4 Tamb = 50°C
ATEX
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
FIGURE 1-1. MENU TREE FOR MODEL SOLU COMP Xmt-P-HT TRANSMITTER
1.4 MENU TREE FOR MODEL XMT-P-HT
55
Language
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
FIGURE 1-2. MENU TREE FOR MODEL SOLU COMP Xmt-P-FF TRANSMITTER
1.5 MENU TREE FOR MODEL XMT-P-FF
6
Language
7
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.7 FOUNDATION FIELDBUS
Figure 1-3 shows a Xmt-P-FF being used to measure and control pH and chlorine levels in drinking water. The figure also
shows three ways in which Fieldbus communication can be used to read process variables and configure the transmitter.
FIGURE 1-3. CONFIGURING MODEL XMT-P TRANSMITTER WITH FOUNDATION FIELDBUS
1.6 HART COMMUNICATIONS
1.6.1 OVERVIEW OF HART COMMUNICATION
HART (highway addressable remote transducer) is a digital communication system in which two frequencies are superimposed on the 4 to 20 mA output signal from the transmitter. A 1200 Hz sine wave represents the digit 1, and a 2400 Hz
sine wave represents the digit 0. Because the average value of a sine wave is zero, the digital signal adds no dc component to the analog signal. HART permits digital communication while retaining the analog signal for process control.
The HART protocol, originally developed by Fisher-Rosemount, is now overseen by the independent HART
Communication Foundation. The Foundation ensures that all HART devices can communicate with one another. For more
information about HART communications, call the HART Communication Foundation at (512) 794-0369. The internet
address is http://www.hartcomm.org.
1.6.2 HART INTERFACE DEVICES
The Model 375 HART Communicator is a hand-held device that provides a common link to all HART SMART instruments and allows access to AMS (Asset Management Solutions). Use the HART communicator to set up and control the
Xmt-P-HT and to read measured variables. Press ON to display the on-line menu. All setup menus are available through
this menu.
HART communicators allow the user to view measurement data (pH, ORP and temperature), program the transmitter, and
download information from the transmitter for transfer to a computer for analysis. Downloaded information can also be sent
to another HART transmitter. Either a hand-held communicator, such as the Rosemount Model 375, or a computer can be
used. HART interface devices operate from any wiring termination point in the 4 - 20 mA loop. A minimum load of 250 ohms
must be present between the transmitter and the power supply. See Figure 1-4.
If your communicator does not recognize the Model XMT pH/ORP transmitter, the device description library may need
updating. Call the manufacturer of your HART communication device for updates.
Xmt-P-FF
8
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
FIGURE 1-4. HART Communicators.
Both the Rosemount Model 375 (or 275) and a computer can be used to communicate with a HART transmitter. The 250 ohm load
(minimum) must be present between the transmitter and the power supply.
1.8 ASSET MANAGEMENT SOLUTIONS
Asset Management Solutions (AMS) is software that helps plant personnel better monitor the performance of analytical
instruments, pressure and temperature transmitters, and control valves. Continuous monitoring means maintenance personnel can anticipate equipment failures and plan preventative measures before costly breakdown maintenance is
required.
AMS uses remote monitoring. The operator, sitting at a computer, can view measurement data, change program settings,
read diagnostic and warning messages, and retrieve historical data from any HART-compatible device, including the Model
XMT-P transmitter. Although AMS allows access to the basic functions of any HART compatible device, Rosemount
Analytical has developed additional software for that allows access to all features of the Model XMT-P transmitter.
AMS can play a central role in plant quality assurance and quality control. Using AMS Audit Trail, plant operators can track
calibration frequency and results as well as warnings and diagnostic messages. The information is available to Audit Trail
whether calibrations were done using the infrared remote controller, the Model 375 HART communicator, or AMS software.
AMS operates in Windows 95. See Figure 1-5 for a sample screen. AMS communicates through a HART-compatible
modem with any HART transmitters, including those from other manufacturers. AMS is also compatible with F
OUNDATION™
Fieldbus, which allows future upgrades to Fieldbus instruments.
Rosemount Analytical AMS windows provide access to all transmitter measurement and configuration variables. The
user can read raw data, final data, and program settings and can reconfigure the transmitter from anywhere in the plant.
Model Xmt-P
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
FIGURE 1-5. AMS MAIN MENU TOOLS
9
10
MODEL XMT-P pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
1.10 ACCESSORIES
POWER SUPPLY: Use the Model 515 Power Supply to provide dc loop power to the transmitter. The Model 515 pro-
vides two isolated sources at 24Vdc and 200 mA each. For more information refer to product data sheet 71-515.
ALARM MODULE: The Model 230A alarm Module receives the 4-20 mA signal from the Xmt-P-HT transmitter and acti-
vates two alarm relays. High/high, low/low, and high/low are available. Hysteresis (deadband) is also adjustable. For
more information, refer to product data sheet 71-230A.
HART COMMUNICATOR: The Model 375 HART communicator allows the user to view measurement values as well as
to program and configure the transmitter. The Model 375 attaches to any wiring terminal across the output loop. A
minimum 250 Ω load must be between the power supply and transmitter. Order the Model 375 communicator from
Emerson Process Management. Call (800) 999-9307.
1.9 ORDERING INFORMATION
The Solu Comp Model Xmt Two-Wire Transmitter is intended for the determination of pH, ORP, or Redox.
ACCESSORIES
MODEL/PN DESCRIPTION
515 DC loop power supply (see product data sheet 71-515)
23820-00 2-in. pipe mounting kit
9240048-00 Stainless steel tag, specify marking
23554-00 Gland fittings PG 13.5, 5 per package
CODE REQUIRED SELECTION
HT Analog 4-20 mA output with superimposed HART digital signal
FF Foundation fieldbus digital output
FI Foundation fieldbus digital output with FISCO
CODE REQUIRED SELECTION
10 Panel mounting enclosure
11 Pipe/Surface mounting enclosure (pipe mounting requires accessory kit PN 23820-00)
CODE AGENCY APPROVALS
60 No approval
67 FM approved intrinsically safe and non-incendive (when used with appropriate sensor and safety barrier)
69 CSA approved intrinsically safe and non-incendive (when used with appropriate sensor and safety barrier)
73 ATEX approved intrinsically safe (when used with appropriate sensor and safety barrier)
CODE REQUIRED SELECTION
P pH/ORP
MODEL
Xmt SMART TWO-WIRE MICROPROCESSOR TRANSMITTER
Xmt-P-HT-10-67 EXAMPLE
11
MODEL XMT-P pH/ORP SECTION 2.0
INSTALLATION
SECTION 2.0
INSTALLATION
2.1 Unpacking and Inspection
2.2 Pre-Installation Set Up
2.3 Installation
2.1 UNPACKING AND INSPECTION
Inspect the shipping container. If it is damaged, contact the shipper immediately for instructions. Save the box. If there is
no apparent damage, remove the transmitter. Be sure all items shown on the packing list are present. If items are missing, immediately notify Rosemount Analytical.
Save the shipping container and packaging. They can be reused if it is later necessary to return the transmitter to the factory.
2.2 PRE-INSTALLATION SETUP
2.2.1 Temperature Element
The Model XMT-P pH/ORP transmitter is compatible with sensors having Pt 100 and Pt 1000. Sensors from other manufacturers may have a Pt 1000 RTD. For Rosemount Analytical sensors, the type of temperature element in the sensor is
printed on the tag attached to the sensor cable. For the majority of sensors manufactured by Rosemount Analytical, the
RTD IN lead is red and the RTD RTN lead is white. The Model 328A sensor has no RTD. The Model 320HP system has
a readily identifiable separate temperature element. Resistance at room temperature for common RTDs is given in the
table.
If the resistance is... the temperature element is a
about 110 ohms Pt 100 RTD
about 1100 ohms Pt 1000 RTD
2.2.2 Reference Electrode Impedance
The standard silver-silver chloride reference electrode used in most industrial and laboratory pH electrodes is low impedance. EVERY pH and ORP sensor manufactured by Rosemount Analytical has a low impedance reference. Certain specialized applications require a high impedance reference electrode. The transmitter must be re-programmed to recognize
the high impedance reference.
12
MODEL XMT-P pH/ORP SECTION 2.0
INSTALLATION
2.2.3 Preamplifier Location
pH sensors produce a high impedance voltage signal that must be preamplified before use. The signal can be preamplified before it reaches the transmitter or it can be preamplified in the transmitter. To work properly, the transmitter must know
where preamplification occurs. Although ORP sensors produce a low impedance signal, the voltage from an ORP sensor
is amplified the same way as a pH signal.
If the sensor is wired to the transmitter through a junction box, the preamplifier is ALWAYS in either the junction box or the
sensor. Junction boxes can be attached to the sensor or installed some distance away. If the junction box is not attached
to the sensor, it is called a remote junction box. In most junction boxes used with the Model XMT-P pH/ORP, a flat, black
plastic box attached to the same circuit board as the terminal strips houses the preamplifier. The preamplifier housing in
the 381+ sensor is crescent shaped.
If the sensor is wired directly to the transmitter, the preamplifier can be in the sensor or in the transmitter. If the sensor
cable has a GREEN wire, the preamplifier is in the sensor. If there is no green wire, the sensor cable will contain a coaxial cable. A coaxial cable is an insulated wire surrounded by a braided metal shield. Depending on the sensor model, the
coaxial cable terminates in either a BNC connector or in a separate ORANGE wire and CLEAR shield.
13
MODEL XMT-P pH/ORP SECTION 2.0
INSTALLATION
2.3 INSTALLATION
1. Although the transmitter is suitable for outdoor use,
do not install it in direct sunlight or in areas of extreme
temperatures.
2. Install the transmitter in an area where vibrations and
electromagnetic and radio frequency interference are
minimized or absent.
3. Keep the transmitter and sensor wiring at least one
foot from high voltage conductors. Be sure there is
easy access to the transmitter.
4. The transmitter is suitable for panel (Figure 2-3), pipe
(Figure 2-4), or surface (Figure 2-5) mounting.
5. The transmitter case has two 1/2-inch (PG13.5) con-
duit openings and either three or four 1/2-inch knockouts. The panel mount Xmt-P-HT has four knockouts.
The pipe/surface mount transmitter has three knockouts*. One conduit opening is for the power/output
cable; the other opening is for the sensor cable.
Figure 1 shows how to remove a knockout. The
knockout grooves are on the outside of the case.
Place the screwdriver blade on the inside of the case
and align it approximately along the groove. Rap the
screwdriver sharply with a hammer until the groove
cracks. Move the screwdriver to an uncracked portion
of the groove and continue the process until the
knockout falls out. Use a small knife to remove the
flash from the inside of the hole.
6. Use weathertight cable glands to keep moisture out to
the transmitter. If conduit is used, plug and seal the
connections at the transmitter housing to prevent
moisture from getting inside the instrument.
7. To reduce the likelihood of stress on wiring connec-
tions, do not remove the hinged front panel (-11 models) from the base during wiring installation. Allow
sufficient wire leads to avoid stress on conductors.
*NEMA plug may be supplied instead of knockout for
pipe/surface version.
FIGURE 2-1. Removing the Knockouts
FIGURE 2-2. Power Supply/Current Loop Wiring
14
MODEL XMT-P pH/ORP SECTION 2.0
INSTALLATION
FIGURE 2-3. Panel Mount Installation
Access to the wiring terminals is through the rear cover. Four screws hold the cover in place.
Panel Mounting.
MILLIMETER
INCH
15
MODEL XMT-P pH/ORP SECTION 2.0
INSTALLATION
FIGURE 2-4. Pipe Mount Installation
The front panel is hinged at the bottom. The panel swings down for access to the wiring terminals.
Pipe Mounting.
MILLIMETER
INCH
16
MODEL XMT-P pH/ORP SECTION 2.0
INSTALLATION
FIGURE 2-5. Surface Mount Installation
The front panel is hinged at the bottom. The panel swings down for access to the wiring terminals.
Surface Mounting.
MILLIMETER
INCH
17
MODEL XMT-P pH/ORP SECTION 3.0
WIRING
3.1 POWER SUPPLY/CURRENT LOOP —
MODEL XMT-P-HT
3.1.1 Power Supply and Load Requirements.
Refer to Figure 3-1.
The supply voltage must be at least 12.0 Vdc at the transmitter terminals. The power supply must be able to cover the voltage drop on
the cable as well as the load resistor (250 Ω minimum) required for
HART communications. The maximum power supply voltage is
42.0 Vdc. For intrinsically safe installations, the maximum power
supply voltage is 30.0 Vdc. The graph shows load and power supply requirements. The upper line is the power supply voltage needed to provide 12 Vdc at the transmitter terminals for a 22 mA current. The lower line is the power supply voltage needed to provide
30 Vdc for a 22 mA current.
The power supply must provide a surge current during the first 80 milliseconds of startup. The maximum current is about
24 mA.
For digital communications, the load must be at least 250 ohms. To supply the 12.0 Vdc lift off voltage at the transmitter,
the power supply voltage must be at least 17.5 Vdc.
FIGURE 3-1. Load/Power Supply Requirements
FIGURE3-2. Power Supply/Current Loop Wiring
3.1.2 Power Supply-Current Loop
Wiring.
Refer to Figure 3-2.
Run the power/signal wiring through
the opening nearest TB-2.
For optimum EMI/RFI protection . . .
1. Use shielded power/signal cable
and ground the shield at the
power supply.
2. Use a metal cable gland and be
sure the shield makes good electrical contact with the gland.
3. Use the metal backing plate (see
Figure 2-6) when attaching the
gland to transmitter enclosure.
The power/signal cable can also be
enclosed in an earth-grounded
metal conduit.
Do not run power supply/signal
wiring in the same conduit or cable
tray with AC power lines or with
relay actuated signal cables. Keep
power supply/signal wiring at least
6 ft (2 m) away from heavy electrical
equipment.
SECTION 3.0
WIRING
18
MODEL XMT-P pH/ORP SECTION 3.0
WIRING
3.2 POWER SUPPLY WIRING FOR
MODEL XMT-P-FF
3.2.1 Power Supply Wiring. Refer to Figure 3-3 and
Figure 3-4.
Run the power/signal wiring through the opening nearest
TB2. Use shielded cable and ground the shield at the
power supply. To ground the transmitter, attach the shield
to TB2-3.
NOTE
For optimum EMI/RFI immunity, the power supply/output cable should be shielded and enclosed
in an earth-grounded metal conduit.
Do not run power supply/signal wiring in the same conduit
or cable tray with AC power lines or with relay actuated
signal cables. Keep power supply/signal wiring at least
6 ft (2 m) away from heavy electrical equipment.
FIGURE 3-3. Typical Fieldbus Network Electrical
Wiring Configuration
XMT-P pH/ORP
Transmitter
XMT-P pH/ORP
Transmitter
FIGURE 3-4. Loop Power and Sensor Wiring
Panel Mount Pipe/Surface Mount
19
MODEL XMT-P pH/ORP SECTION 3.0
WIRING
3.3 SENSOR WIRING
3.3.1 Sensor Wiring Information
pH and ORP sensors manufactured by Rosemount Analytical can be wired to the Model XMT-P transmitter in three ways:
1. directly to the transmitter,
2. to a sensor-mounted junction box and then to the transmitter,
3. to a remote junction box and then from the remote junction box to the transmitter.
The pH (or ORP) signal can also be preamplified in one of four places. See Section 7.4.3 for set-up. The transmitter is factory configured with a preamplifier.
1. in the sensor (a, d),
2. in a junction box mounted on the sensor (c),
3. in a remote junction box (e).
4. at the transmitter (b).
NOTE: For 22K NTC RTDs, wire leads to TB1-1 and TB1-3.
3.3.2 General Wiring Configurations
Figure 3-5 illustrates the various wiring arrangements for Xmt-P.
FIGURE 3-5. Wiring and Preamplifier Configurations for pH and ORP Sensors.
The asterisk identifies the location of the preamplifier. In (a) and (b) the sensor is wired directly to the transmitter. The signal is amplified at the sensor (a) or at the transmitter (b). In (c) the sensor is wired through a sensor-mounted junction box to the transmitter.
The preamplifier is in the sensor-mounted junction box. In (d) and (e) the sensor is wired through a remote junction box to the transmitter. The preamplifier is located in the sensor (d) or the junction box (e).
Refer to the Instruction Sheet provided with each sensor for specific wiring instructions.
20
For FM Intrinsically Safe Label, see Figure 4-1.
For FM Intrinsically Safe Installation, see Figure 4-2.
For CSA Instrinsically Safe Label, see Figure 4-3.
For CSA Instrinsically Safe Installation, see Figure 4-4.
For ATEX Instrinsically Safe Label, see Figure 4-5.
For ATEX Instrinsically Safe Installation, see Figure 4-6.
MODEL XMT-P pH/ORP SECTION 4.0
INTRINSICALLY SAFE INSTALLATION
SECTION 4.0
INTRINSICALLY SAFE INSTALLATION
INTRINSICALLY SAFE INSTALLATIONS FOR MODEL XMT-P-HT
FIGURE 4-1. FM Intrinsically Safe Label for Model Xmt-P-HT
21
FIGURE 4-2. FM Intrinsically Safe Installation (1 of 2) for Model Xmt-P-HT
22
FIGURE 4-3. FM Intrinsically Safe Installation (2 of 2) for Model Xmt-P-HT
Loading...