Rosemount 2081 pH User manual

Model 2081 pH
Smart Microprocessor
Analyzer
Instruction Manual
PN 5102081P
November 2000
FREE
EXTENDED
WARRANTY!
(See offer at back of manual)

ESSENTIAL INSTRUCTIONS
READ THIS PAGE BEFORE PROCEEDING!
SS-2081
Feb. 1992
Rosemount Analytical designs, manufactures, and
tests its products to meet many national and inter-
national standards. Because these instruments are
sophisticated technical products, you must proper-
ly install, use, and maintain them to ensure they
continue to operate within their normal specifica-
tions. 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 sit-
uations to occur: Loss of life; personal injury; prop-
erty damage; damage to this instrument; and war-
ranty 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 clarifi-
cation.
• 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 prop-
er electrical sources.
• To ensure proper performance, use qualified per-
sonnel 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 main-
tenance is being performed by qualified persons,
to prevent electrical shock and personal injury.
Rosemount Analytical Inc.
Uniloc Division
2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: [phone]
1-800-854-8257
www.RAuniloc.com
© Rosemount Analytical Inc. 1999

MODEL 2081 pH
MICROPROCESSOR TRANSMITTER
TABLE OF CONTENTS
Section Title Page
1.0 INSTALLATION....................................................................................................... 1
1.1 Unpacking and Inspection...................................................................................... 1
1.2 Mechanical Installation............................................................................................ 1
1.3 Wiring ...................................................................................................................... 1
1.4 Jumper Settings ...................................................................................................... 2
1.5 Hazardous Locations - Explosion Proof Installations .............................................. 3
1.6 Hazardous Locations - Intrinsically Safe Installations............................................. 3
2.0 QUICK START-UP PROCEDURE........................................................................... 11
2.1 General.................................................................................................................... 11
2.2 Set-Up Instrument ................................................................................................... 11
2.3 Temperature Standardization .................................................................................. 12
2.4 Two-Point Calibration .............................................................................................. 13
2.5 Current Output Check ............................................................................................. 14
3.0 DESCRIPTION OF CONTROLS............................................................................. 15
3.1 General.................................................................................................................... 15
3.2 Menu Selection........................................................................................................ 15
3.3 Value Adjustment .................................................................................................... 15
4.0 RANGE CONFIGURATION .................................................................................... 16
5.0 START UP AND CALIBRATION ............................................................................ 17
5.1 General.................................................................................................................... 17
5.2 Temperature Calibration.......................................................................................... 17
5.3 Buffer Calibration .................................................................................................... 17
5.4 pH Standardization ................................................................................................. 18
5.5 pH Glass Slope ....................................................................................................... 18
5.6 Hold Mode for Maintenance.................................................................................... 19
5.7 Sensor Maintenance ............................................................................................... 19
6.0 KEYBOARD SECURITY......................................................................................... 20
7.0 THEORY OF OPERATION ..................................................................................... 21
8.0 DIAGNOSTICS AND TROUBLESHOOTING.......................................................... 22
8.1 Diagnostics ............................................................................................................. 22
8.2 Troubleshooting....................................................................................................... 22
9.0 DESCRIPTION AND SPECIFICATIONS ................................................................ 26
9.1 Features .................................................................................................................. 26
9.2 Functional Specifications ........................................................................................ 27
9.3 Performance Specifications .................................................................................... 27
9.4 Physical Specifications ........................................................................................... 27
9.5 Recommended Sensors.......................................................................................... 28
9.6 Ordering Information ............................................................................................... 28
9.7 Model 2081 pH Replacement Parts and Accessories ............................................ 29
10.0 RETURN OF MATERIALS...................................................................................... 30
i
MODEL 2081 pH TABLE OF CONTENTS

TABLE OF CONTENTS CONT’D.
LIST OF FIGURES
Figure No. Title Page
1-1 Model 2081 pH Power and Sensor Wiring .............................................................. 4
1-2 Sensor Wiring Details for use with 2081 pH............................................................ 5
1-3 Model 2081 pH Jumper Settings ............................................................................ 6
1-4 BASEEFA Label for Instrinsically Safe Installation .................................................. 6
1-5 Explosion Proof System Installation Schematic (FM) .............................................. 7
1-6 Intrinsically Safe System Installation Schematic (FM) Page 1 of 2 ......................... 8
1-7 Intrinsically Safe System Installation Schematic (FM) Page 2 of 2 ......................... 9
1-8 Intrinsically Safe System Installation Schematic (CSA)........................................... 10
2-1 Wiring Setup............................................................................................................ 11
2-2 Button Use............................................................................................................... 12
3-1 Menu Description .................................................................................................... 15
6-1 Model 2081 pH Jumper Settings ............................................................................ 20
8-1 Bench Check with preamp...................................................................................... 25
8-2 Bench Check without preamp................................................................................. 25
LIST OF TABLES
Table No. Title Page
8-1 Fault Mnemonics ..................................................................................................... 22
8-2 RTD Resistance Values ........................................................................................... 22
8-3 Sensor Input V. pH at Four Temperatures ............................................................... 23
8-4 Voltage Input to Transmitter .................................................................................... 23
8-5 Troubleshooting Guide ............................................................................................ 24
ii
MODEL 2081 pH TABLE OF CONTENTS

1.1 UNPACKING AND INSPECTION. Inspect the
transmitter for shipping damage. If damaged, notify
the carrier immediately. Confirm that all items shown
on the packing list are present. Notify Rosemount
Analytical if items are missing. If the transmitter
appears to be in satisfactory condition proceed to
Section 1.2.
NOTE
Save the original packing cartons and
materials as most carriers require proof of
damage due to mishandling.
1.2 MECHANICAL INSTALLATION.
1.2.1 General. The transmitter may be installed in
harsh environments. However, it should be installed in
an area where sources of extreme temperature fluctu-
ation, vibration and shock are at a minimum or absent.
Select an installation site that (1) permits the use of the
standard cable lengths (unless a J-box is used), (2) is
easily accessed by operating and maintenance per-
sonnel, and (3) is at least 12 inches (.3 m) from
sources of high voltage.
1.2.2 Mounting. The transmitter may be mounted on
a flat surface using the two threaded mounting holes
located on the bottom of the transmitter or through the
use of an optional 2-inch pipe/wall mounting bracket,
Code 07 (Figure 1-1).
NOTE
The meter may be installed in 90-degree incre-
ments for easy viewing. Remove the four screws
holding the meter in place and change the
meter to the desired angle. Plug in the display
and tighten the four screws.
1.3 WIRING. The transmitter is equipped with two 1/2-
inch NPT conduit openings, one on each side of the
housing. One is for the power supply/signal wiring and
the other is for the sensor wiring.
To prevent moisture from entering the housing, the use
of weathertight cable glands or conduit is recom-
mended. If conduit is used, it should be positioned to
prevent condensation from draining into the housing.
Conduit connections on the transmitter housing should
be plugged and sealed to avoid moisture accumulation
in the terminal side of the housing.
CAUTION
If the connections are not sealed, the
transmitter should be mounted with the
electrical housing positioned downward
for drainage. Wiring should be installed
with a drip loop, and the bottom of the drip
loop should be lower than the conduit con-
nections or the transmitter housing.
The signal wiring should be twisted pairs for best
results. The twisted pairs should also be shielded and
grounded. The best place to ground the loop is at the
negative terminal of the power supply. Do not ground
the signal loop in more than one point. The transmitter
case shall be grounded.
Signal or sensor wiring should never be run in the
same conduit or open tray as AC power or relay actu-
ated signal cables. Keep signal or sensor wiring at
least 12 in. (.3 m) from heavy electrical equipment.
NOTE
For best EMI/RFI protection the output cable
should be shielded and enclosed in an earth
grounded rigid metal conduit. Connect the
cable’s outer shield to the ground terminal
provided next to TB2, Figure 1-1.
The sensor cable should also be shielded.
Connect this outer shield to earth ground as in
the instructions above. If the outer shield is
braided an appropriate metal cable gland fit-
ting may be used to connect the outer braid to
earth groud via the instrument case.
1
SECTION 1.0 INSTALLATION
MODEL 2081 pH SECTION 1.0
INSTALLATION

2
NOTE
For RFI/EMI protection, the power
supply/signal wiring and sensor wiring must
be shielded, preferably in metal conduit,
and the shields terminated to earth ground.
1.3.1 Sensor Wiring. The sensor wiring terminals are
located on the side of the housing opposite of the LCD
meter. Remove the housing cover to gain access to the
terminals. Pass the sensor cable through the transmitter’s
conduit opening. Connect the sensor wiring to TB1 ter-
minals 1 through 12 as shown on Figure 1-1.
NOTE
Sensors are supplied with a standard
cable length of 10 feet (3.0 m) or 15 feet
(4.5 m). If the standard cable length is not
sufficient for the planned installation, the
use of a junction box with extension cable
is strongly recommended. Do not exceed
1000 feet (305 m) total cable length from
the sensor to the transmitter.
1.3.2 Integral Preamplifier Jumper. If direct input
from a sensor without a preamplifier is used, refer to
Figure 1-1 and Figure 1-2 for sensor wiring. The sen-
sor cannot be more than 15 (4.5m) feet from the trans-
mitter for this option.
Many pH sensors without preamps come with BNC
connectors, but the Model 2081 pH only takes bare
wire connections. To make the sensor compatible, cut
off the BNC and terminate it according to Figure 1-2.
1.3.3 Power and Signal Wiring. The power and signal
wiring terminal is TB2 terminals 1 through 4 as shown
in Figure 1-1.
1.4 JUMPER SETTINGS.
1.4.1 General This section describes how to set the
jumpers on the CPU board for the following:
CAUTION
The circuit board is electrostatically sensi-
tive. Be sure to observe handling pre-
cautions for static-sensitive components.
1. Output value in fault (alarm) mode
2. 50/60 Hz operation
3. Security
1.4.2 Fault Mode Output. The default output of the
transmitter during a fault condition is determined by
the position of the default current output jumper locat-
ed on [JP3] (refer to Figure 1-3). The output can be set
to default either:
- below 4mA - JP3 with jumper
- above 20mA - JP3 without jumper (factory setting).
Place jumper on one post only to prevent misplacing
it. The following are possible faults. See Section 8.0 for
further information.
Fault Mnemonics
“SLP – FAIL” - Electrode slope out of limits
“ELEC – FAIL” - Transmitter electronics failure
“rngE – LOOP” - pH value outside 4-20 mA range
points
“tEnP – Lo” - Temperature too low or RTD shorted
“tEnP – Hi” - Temperature too high or RTD open
1.4.3 Fifty Hz Operation. See Figure 1-3. Although
the 2081 uses direct current, a jumper selection may
be made to help reduce electrical noise from the oper-
ating environment. North America uses 60 Hz ac
power, while Europe uses 50 Hz ac power.
– 50 Hz - JP1 with jumper
– 60 Hz - JP1 without jumper (factory setting).
Place jumper on one post only to prevent mis-
placing it.
1.4.4 Security. Also explained in Section 6.0. See
Figure 1-3.
– Disable 2081 push buttons - JP4 without jumper.
Place jumper on one post only to prevent mis-
placing it.
– Enable 2081 push buttons - JP4 with jumper (fac-
tory setting).
MODEL 2081 pH SECTION 1.0
INSTALLATION

3
1.5 HAZARDOUS LOCATIONS-EXPLOSION PROOF
INSTALLATIONS. In order to maintain the explosion
proof rating for installed transmitter, the following con-
ditions must be met.
1. The transmitter enclosure covers must be on hand
tight and the threads must not be damaged.
NOTE
These covers seat on rings which serve to
provide a dust proof enclosure for Class II
and Class III installations.
2. Explosion proof "Y" fittings must be properly
installed and plugged with a sealing compound to
prevent explosive gases from entering the trans-
mitter. CSA has determined that the transmitter
housing is "Factory Sealed". Installation of "Y" fit-
tings and the use of sealing compound is not
required for CSA approved Explosion Proof instal-
lations.
NOTE
Do not install sealing compound until all
field wiring is completed.
CAUTION
Sealing compound must be installed prior
to applying power to the transmitter.
3. If one of the conduit connections on the housing is
not used, it must be closed with a threaded metal
plug with at least five threads engaged.
4. The serial tag cover on the external ZERO and
SPAN adjustments must be in place.
6. Explosion proof installation must be in accordance
with Drawing Number 1400160 (see Figure 1-5).
5. For sensors in hazardous area locations, explosion
proof junction boxes can be provided to house the
preamplifier. This does not warrant the pH or ORP
sensor explosion-proof. Maximum safety can be
achieved by installing an intrinsically safe system
where Hazardous Area requirements must be met.
1.6 HAZARD LOCATIONS - INTRINSICALLY SAFE
INSTALLATIONS. See Figure 1-4. To secure and
maintain intrinsically safe installations for the appro-
priate approval agency, the following conditions must
be met:
1. Code 67 must be specified when ordering F.M.
(Factory Mutual) units. Approved “Entity”
installation must be in accordance with
Drawing Number 1400161 (see Figure 1-6 and
Figure 1-7).
2. Code 69 must be specified when ordering
C.S.A. (Canadian Standards Association) units.
Installation must be in accordance with Drawing
Number 1400162 (see Figure 1-8).
MODEL 2081 pH SECTION 1.0
INSTALLATION

4
FIGURE 1-1. Model 2081 pH Power and Sensor Wiring (see also Figure 1-2 for sensor wiring)
WHEN INCH AND METRIC DIMS
ARE GIVEN
MILLIMETER
INCH
DWG. NO. REV.
40208101 B
MODEL 2081 pH SECTION 1.0
INSTALLATION

5
FIGURE 1-2. Sensor Wiring Details For use with 2081 pH
WHEN INCH AND METRIC DIMS
ARE GIVEN
MILLIMETER
INCH
DWG. NO. REV.
40039903 G
MODEL 2081 pH SECTION 1.0
INSTALLATION

6
DWG. NO. REV.
233050-00
FIGURE 1-3. Model 2081 pH Jumper Settings
FIGURE 1-4. BASEEFA Label for Intrinsically Safe Installation
DWG. NO. REV.
9240044-00 A
MODEL 2081 pH SECTION 1.0
INSTALLATION