Rosemount 1054A pH User manual

Model 1054A pH
Microprocessor
pH Analyzer
Instruction Manual
P/N 5101054AP
January 1997

WARNING
ELECTRICAL SHOCK HAZARD
Making cable connections to and serv-
icing this instrument require access to
shock hazard level voltages which can
cause death or serious injury.
Relay contacts made to separate
power sources must be disconnected
before servicing.
Electrical installation must be in
accordance with the National
Electrical Code (ANSI/NFPA-70)
and/or any other applicable national
or local codes.
Unused cable conduit entries must be
securely sealed by non-flammable
closures to provide enclosure integrity
in compliance with personal safety
and environmental protection require-
ments.
For safety and proper performance
this instrument must be connected to
a properly grounded three-wire
power source.
Proper relay use and configuration is
the responsibility of the user.
Do not operate this instrument without
front cover secured. Refer installation,
operation and servicing to qualified
personnel.
SS-MA54
Feb. 1992
ESSENTIAL INSTRUCTIONS
READ THIS PAGE BEFORE PROCEEDING!
Rosemount Analytical designs, manufactures, and tests
its products to meet many national and international stan-
dards. Because these instruments are sophisticated tech-
nical products, you must properly install, use, and main-
tain 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 [phone] 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 instal-
lation, 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 qual-
ified 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 substitu-
tions may result in fire, electrical hazards, or improper
operation.
• Ensure that all equipment doors are closed and protec-
tive covers are in place, except when maintenance is
being performed by qualified persons, to prevent elec-
trical shock and personal injury.
Rosemount Analytical Inc.
Uniloc Division
2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: [phone]

MODEL 1054A pH TABLE OF CONTENTS
MODEL 1054A pH
MICROPROCESSOR ANALYZER
TABLE OF CONTENTS
Section Title Page
1.0 DESCRIPTION AND SPECIFICATIONS................................................................... 1
1.1 Features and Applications....................................................................................... 1
1.2 Physical Specifications-General.............................................................................. 2
1.3 Instrument Specifications........................................................................................ 2
1.4 Recommend Sensors.............................................................................................. 2
2.0 INSTALLATION ........................................................................................................ 3
2.1 General.................................................................................................................... 3
2.2 Unpacking and Inspection...................................................................................... 3
2.3 Mechanical Installation............................................................................................ 3
2.3.1 Panel Mounting........................................................................................................ 3
2.3.2 Wall Mounting.......................................................................................................... 3
2.3.3 Pipe Mounting.......................................................................................................... 3
2.3.4 Wall Mounting Enclosure......................................................................................... 3
2.4 Electrical Wiring....................................................................................................... 4
2.4.1 Power Input Wiring .................................................................................................. 4
2.4.2 Output Wiring........................................................................................................... 4
3.0 DESCRIPTION OF CONTROLS............................................................................... 15
3.1 Keyboard Functions ................................................................................................ 15
4.0 CONFIGURATION ................................................................................................... 19
4.1 Configuration........................................................................................................... 19
4.2 Alarm 1 and 2 ......................................................................................................... 22
4.3 Interval Timer .......................................................................................................... 24
4.4 Temperature ............................................................................................................ 26
4.5 Current Output ........................................................................................................ 28
4.6 pH Electrode Diagnostics........................................................................................ 30
4.7 Solution Temperature Compensation and Isopotential Point................................... 32
4.8 Defaults.................................................................................................................... 34
4.9 Automatic Buffer Mode............................................................................................ 36
4.10 Alarm Setpoint......................................................................................................... 38
4.11 Output Scale Expansion.......................................................................................... 39
4.12 Simulate Current Output.......................................................................................... 40
5.0 START- UP AND CALIBRATION............................................................................... 41
5.1 Start- Up and Calibration......................................................................................... 41
5.2 Temperature Calibration.......................................................................................... 41
5.3 Buffer Calibration..................................................................................................... 41
5.4 pH Standardization.................................................................................................. 42
5.5 pH Glass Slope........................................................................................................ 42
5.6 Sensor Maintenance................................................................................................ 42
6.0 KEYBOARD SECURITY........................................................................................... 43
6.1 Keyboard Security................................................................................................... 43
7.0 THEORY OF OPERATION........................................................................................ 44
7.1 Theory of Operation................................................................................................. 44
i

MODEL 1054A pH TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D.
Section Title Page
8.0 DIAGNOSTICS AND TROUBLESHOOTING......................................... 45
8.1 Diagnostics........................................................................................... 45
8.1.1 Fault Mnemonics.................................................................................. 45
8.1.2 Temperature Compensation................................................................. 45
8.2 Troubleshooting.................................................................................... 46
8.2.1 Installation Failure................................................................................. 46
8.2.2 LCD/LED Display Test .......................................................................... 46
8.2.3 Software Version................................................................................... 46
8.2.4 Sensor Troubleshooting........................................................................ 46
8.2.5 Electrode Input..................................................................................... 46
8.2.6 CPU Board Replacement..................................................................... 46
8.2.7 Power Board Replacement................................................................... 46
9.0 RETURN OF MATERIALS ..................................................................... 49
9.1 General................................................................................................. 49
9.2 Warranty Repair.................................................................................... 49
9.3 Non Warranty Repair............................................................................ 49
LIST OF FIGURES
Figure No. Title Page
2-1 Panel Mounting Cutout......................................................................... 5
2-2 Panel Mounting Tab Installation............................................................ 6
2-3 Wall Mounting J-Box Installation........................................................... 7
2-4 Wall Mounting J-Box Wiring.................................................................. 8
2-5 Pipe Mounting Installation .................................................................... 9
2-6 Wall Mount Enclosure Dimensions and Mounting................................ 10
2-7 Electrical Wiring.................................................................................... 11
2-8 Integral Preamp Wiring for Group I Panel Mount Enclosure ................ 12
2-9 Integral Preamp Wiring for Group II Panel Mount Enclosure ............... 13
3-1 Keyboard Overlay................................................................................. 16
4-1 Menu Items........................................................................................... 20
4-2 Alarms 1 and 2 Configuration............................................................... 23
4-3A Interval Timer Example......................................................................... 24
4-3 Interval Timer Configuration ................................................................. 25
4-4 Temperature Configuration................................................................... 27
4-5 Current Output Configuration............................................................... 29
4-6 pH Electrode Diagnostics Configuration.............................................. 31
4-7 Solution Temperature Compensation & Isopotential Point Configuration 33
4-8 Default State Configuration .................................................................. 35
4-9 Automatic Buffer Mode Configuration.................................................. 37
4-10 Alarm Setpoint...................................................................................... 38
4-11 Output Scale Expansion....................................................................... 39
4-12 Simulate Current Output....................................................................... 40
LIST OF TABLES
Table No. Title Page
3-1 Key Description.................................................................................... 17
3-2 Information Mnemonics........................................................................ 18
3-3 Set Function Mnemonics...................................................................... 18
4-1 Configuration Work Sheet..................................................................... 21
4-2 Relay States For Various Analyzer Conditions & Alarm/Default Config. 34
8-1 Fault Mnemonics .................................................................................. 45
8-2 RTD Resistance Values........................................................................ 45
8-3 Troubleshooting Guide......................................................................... 47
8-4 Sensor Input to Analyzer vs. pH at Four Temperatures........................ 46
8-5 Replacement Parts and Accessories................................................... 48
8-6 Ordering Information ............................................................................ 48
ii

1
MODEL 1054A pH SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
• FM AND CSA APPROVED For Class I, Division 2, Gas Groups A, B, C, and D.
• pH ELECTRODE DIAGNOSTICS warn user of the need for calibration or electrode replace-
ment.
• AUTOMATIC BUFFER RECOGNITION with stored buffer-temperature curves.
• NEMA 4X (IP65) WEATHERPROOF CORROSION-RESISTANT ENCLOSURE.
• NO BATTERY BACK-UP REQUIRED. Non-volatile EEPROM memory.
• SPECIFIC PROCESS TEMPERATURE COMPENSATION for pH changes due to tempera-
ture.
1.1 FEATURES AND APPLICATIONS
The Model 1054A Microprocessor Analyzers, with the
appropriate sensor, are designed to continuously meas-
ure and control pH, ORP, conductivity, percent concen-
tration, dissolved oxygen and total free chlorine in
industrial and municipal processes.
The Model 1054A is housed in a NEMA 4X (IP65)
weatherproof corrosion-resistant, flame retardant
enclosure suitable for panel, pipe or wall mounting.
All functions are accessed through the front panel
membrane keyboard which features tactile feedback.
Measurement data may be read at any time; however,
settings may be protected against accidental or
unauthorized changes by a user selectable security
code. The display indicates the measured value in
engineering units as well as temperature, alarm sta-
tus, hold output and fault conditions.
The analyzer transmits an isolated current output which
is continuously expandable over the measurement
range for either direct or reverse action. A hold output
function is available for allowing manual control during
routine sensor maintenance. During hold mode the
output will be at a preset or last process value.
In the event of one of the following conditions, the
analyzer will drive the output to a preset value in addi-
tion to displaying a fault code. Continuous self diag-
nostics alert the user to the following:
With automatic buffer recognition, the analyzer recog-
nizes the buffers, then calculates the electrode slope
using stored pH-temperature curves for ten common
buffers.
Dual alarms are a standard feature on the Model
1054A and are programmable for either high or low
operation. Alarm 2 may be programmed to activate in
event of a failure detected by the continuous diagnos-
tics. Both alarms feature independent setpoints,
adjustable hysteresis and time delay action. A dedicat-
ed interval timer with relay is also provided for chemi-
cal or ultrasonic cleaning.
The 1054A automatically compensates the pH read-
ing for process temperature changes. Automatic or
manual temperature compensation is keyboard selec-
table. The process temperature can be read on the
display in °F or °C. Additional process temperature
compensation is available.
The Analyzer includes a 0.7 inch digital display avail-
able in LCD or LED format.
An optional wall mount enclosure is available for use
in high solids or very cold environments.
• Broken or cracked electrode
• Worn out or non-immersed
electrode
• Calibration or coated elec-
trode warning
• Faulty slope value (off-line
only)
• Open wiring
• Analyzer electronics failure
• Faulty temperature element or
temperature value

2
MODEL 1054A pH SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
The Model 1054A pH Analyzer requires a preamplifier to convert
the high impedance pH glass electrode signal to a low impedance
signal. The preamplifier may be located in one of three areas; in the
pH sensor for best performance, in a remote junction box when
process temperatures exceed 80°C (176°F) in submersion applica-
tions, or in the analyzer when the distance between the pH sensor
and the analyzer is 4.5 meters (15 feet) or less. The result is that
the pH signal may then be reliably transmitted from the sensor to
the analyzer using standard shielded 4-wire instrument cable.
The Model 1054A pH measures over the full range of 0-14 pH. The
current output may be calibrated to represent any 1 to 14 pH span.
A two-point calibration is made by immersing the sensor in two dif-
ferent buffer solutions and entering the pH values. When two
buffers are used, the microprocessor automatically calculates the
electrode slope which is used for self-diagnostics. This electrode
slope can be read on the display and manually adjusted for longer
electrode life. A one-point process standardization is easily accom-
plished by entering the pH value of a grab sample.
1.3 INSTRUMENT SPECIFICATIONS @ 25ÞC
Measurement Range: 0 to 14 pH
Output Scale Expansion: Zero suppression: up to 13 pH units
Span: Any pH from 1 to 14
Accuracy: ±0.01 pH
Repeatability: ±0.01 pH
Stability: ±0.01 pH/month, non-cumulative
Temperature Coefficient: Input: ±0.003 pH/°C
Output: ±0.006 pH/°C
Temperature Compensation: PT 100 RTD, Automatic or Manual
-15 to 100°C (5 to 212°F)
1.2 PHYSICAL SPECIFICATIONS - GENERAL
Panel Mount Enclosure: Black, ABS, NEMA 4X, IP65,
CSA Enclosure 4.
144 X 144 X 192mm, DIN size.
(5.7 X 5.7 X 7.6 inches).
Wall Mount Enclosure: Weatherproof, Heavy duty fiberglass
reinforced thermoplastic.
300 X 330 X 190mm
(11.75 X 13 X 7.5 inches).
Front Panel: Membrane keyboard with tactile feedback and user
selectable security. Black and white on grey.
Digital Display: LCD, black on grey
Optional, red LED
Character Height: 18mm (0.7 inch)
Electrical Classification:
Group I Panel Mount Enclosure:
FM Class I, Div. 2, Group A thru D.
28 Vdc relays - 6.0 amps resistive only
150 mA - Groups A & B; 400 mA - Group C;
540 mA - Group D; Ci = 0; Li = 0
CSA Class I, Div. 2, Group A thru D.
28 Vdc, 110 Vac & 230 Vac relays
6.0 Amps resistive only
Group II Wall Mount Enclosure: General Purpose
Power: 115 Vac, ± 10%, 50/60 Hz ± 6%, 4.0 W
230 Vac, ± 10%, 50/60 Hz ± 6%, 4.0 W
Current Output: Isolated, 0-20 mA or 4-20 mA
into 600 ohms maximum load, Direct or Reverse
Output Dampening: 0-255 seconds.
AmbientTemperature: -10 to 65°C (14 to 149°F)
Ambient Humidity: LCD: 0-85% RH
LED: 0-95% RH
Alarms: Dual, field selectable High/Low, High/High, Low/Low
Alarm 2 configurable as a fault alarm
Time Delay 0 to 255 seconds
Dual Setpoints, continuously adjustable
Hysteresis is adjustable up to 2 pH units
for low side/High Alarm and high side/Low Alarm
IntervalTimer: Interval: Minimum 10 minutes
On Counts: 1 to 60
On Duration: 1 to 299 seconds
Off Duration: 1 to 299 seconds
Wait Duration: 1 to 299 seconds
Controls dedicated relay
Relay Contacts: Epoxy Sealed Form A contacts, SPST, Normally
Open. Resistive Inductive
28 Vdc 6.0 Amps 3.0 Amps
115 Vac 6.0 Amps 3.0 Amps
230 Vac 6.0 Amps 1.5 Amps
Weight/Shipping Weight: 1.1 kg/1.6 kg (2.5 lbs./3.5 lbs.)
1.4 RECOMMENDED SENSORS:
Model 300 Retractable pH Sensor
Model 320B FlowThrough pH Sensor
Model 320HP High Purity pH Sensor *
Model 328A Steam Sterilizable pH Sensor
Model 381 Insertion/Submersion/Flow pH Sensor
Model 385 Retractable pH Sensor
Model 399 Disposable pH Sensor
Model 389 Disposable pH Sensor
* Model 1054pH includes programmable temperature corrections
required for the presence of ammonia used in treating high puri-
ty water

3
MODEL 1054A pH SECTION 2.0
INSTALLATION
SECTION 2.0
INSTALLATION
2.1 GENERAL. This analyzer's enclosure is suitable
for outdoor use. However it should be located in an
area where temperature extremes, vibrations, electro-
magnetic and radio frequency interferences are mini-
mized or absent.
2.2 UNPACKING AND INSPECTION. Inspect the
analyzer 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.
2.3 MECHANICAL INSTALLATION. Select an instal-
lation site that is at least one foot from any high volt-
age conduit, has easy access for operating
personnel, and is not in direct sunlight. Mount the
Model 1054A pH as follows:
1. Remove the four screws that secure the rear
cover of the enclosure (not required for wall
mounting, options 20 or 21). The latching hard-
ware for panel and pipe mounting is located
inside the rear cover.
2. For standard panel and pipe mounting, remove
the four screws holding the front panel assembly
of the enclosure and carefully pull the front panel
and connected printed circuit boards straight out
(not required for options 20 or 21).
3. Follow the procedure for the appropriate mount-
ing configuration: Section 2.3.1 for panel mount-
ing, Section 2.3.2 for wall mounting, or Section
2.3.3 for pipe mounting, or Section 2.3.4 for wall
mounting enclosure.
2.3.1 Panel Mounting (Standard). The Model 1054A
pH is designed to fit into a DIN standard 137.9 mm X
137.9 mm (5.43 inch X 5.43 inch) panel cutout (refer
to Figures 2-1 and 2-2).
1. Prepare the analyzer as described in Section 2.3.
2. Install the mounting latches as shown in Figure
2-2 (latches are shown oversize for clarity). If the
latches are not installed exactly as shown, they
will not work correctly. The screws provided are
self-tapping. Tap the screw the full depth of the
mounting latch (refer to side view) leaving a gap
greater than the thickness of the cutout panel.
3. Align the latches as shown and insert the analyz-
er enclosure through the front of the panel
cutout. Tighten the screws for a firm fit. To avoid
damaging the mounting latches, do not use
excessive force.
4. Replace the front panel assembly. Circuit boards
must align with the slots on the inside of the enclo-
sure. Replace the door and four front panel screws.
2.3.2 Wall Mounting (Option-07). Refer to Figures 2-
3 and 2-4. The integral preamp (1054A Code 54)
should not be used with this option.
1. Prepare the analyzer as described in Section 2.3.
2. Mount the junction box and bracket to the ana-
lyzer with the hardware provided. All wiring can
be brought to the terminal strip prior to mounting
the analyzer.
3. Place the metal stiffener on the inside of the ana-
lyzer and mount the two ¼-inch conduit fittings
using two each weather seals as shown. Mount
NEMA 4X conduit plug (included) into center con-
duit hole.
4. Mount the analyzer to the junction box using the
¼-inch conduit fittings.
5. Complete wiring from the 1054A pH to the junc-
tion box (Figure 2-4).
2.3.3 Pipe Mounting (Option-08). The 2" pipe mount-
ing bracket includes a metal plate with a cutout for
the 1054A pH refer to Section 2.3 for mounting the
analyzer into the plate. Mounting details are shown in
Figure 2-5.
2.3.4 Wall Mounting Enclosure (Options-20, 21).
Refer to Figure 2-6. In this configuration the analyzer
is housed in NEMA 4X heavy duty enclosure and may
be mounted on a wall or handrail. Sufficient clearance
should be provided in front of the enclosure to permit
opening the door, which is hinged on the left side.

4
MODEL 1054A pH SECTION 2.0
INSTALLATION
2.4 ELECTRICAL WIRING. The Model 1054A pH
has three conduit openings in the bottom rear of the
analyzer housing which will accommodate ¼-inch
conduit fittings. From a back view, the conduit open-
ing on the left is for timer, alarm, and AC connec-
tions; the center is for signal output and the opening
on the right is for sensor wiring.
The wall mount enclosure has three 3¼4-inch conduit
openings, two with 3¼4-inch fittings and one with a
NEMA 4X conduit plug. From the front view the con-
duit opening on the left is for sensor wiring; the cen-
ter is for signal output, and the right is for timer,
alarm and AC power supply connections. Sensor
wiring should always be run in a separate conduit
from power wiring.
NOTE
Option-07 wall mount: use opening on the
left for sensor wiring. (Refer to Figure 2-4
for wiring.)
NOTE
Option-54 requires installation of the inte-
gral preamplifier module. (Refer to Figure
2-8 for installation and wiring.)
2.4.1 Power Input Wiring. The Model 1054A pH has
been configured at the factory for either 115 VAC or
230 VAC power. Operating power can be changed
by a selector switch located on the power supply
board (P/N 23056-02/03). To access this switch,
remove the four screws from the front keyboard and
pull the electronic assembly straight out.
Connect AC power to TB1-7 and -8, ground to the TB3-
8 (refer to Figure 2-7).
CAUTION
The sensitivity and stability of the analyzer
will be impaired if the input wiring is not
grounded. DO NOT apply power to the
analyzer until all electrical connections are
verified and secure. The following precau-
tions are a guide using UL 508 as a safe-
guard for personnel and property.
1. AC connections and grounding must be in com-
pliance with UL 508 and/or local electrical
codes.
2. The metal stiffener is required to provide support
and proper electrical continuity between conduit
fittings.
3. This type 4/4X enclosure requires a conduit hub
or equivalent that provides watertight connect,
REF UL 508-26.10.
4. Watertight fittings/hubs that comply with the
requirements of UL 514B are to be used.
5. Conduit hubs are to be connected to the conduit
before the hub is connected to the enclosure,
REF UL 508-26.10.
6. If the metal support plate is not used, plastic fit-
tings must be used to prevent structural damage
to the enclosure. Also, appropriate grounding lug
and awg conductor must be used with the plastic
fittings.
2.4.2 Output Wiring. The signal output and alarm
connections are made to terminals 1 through 6 of TB1
and terminals 1 and 2 of TB3 (refer to Figure 2-7).

5
FIGURE 2-1. Panel Mounting Cutout
MODEL 1054A pH SECTION 2.0
INSTALLATION
WHEN INCH AND METRIC DIMS
ARE GIVEN
MILLIMETER
INCH
DWG. NO. REV.
41054A01 B

6
MODEL 1054A pH SECTION 2.0
INSTALLATION
FIGURE 2-2. Panel Mounting Tab Installation
DWG. NO. REV.
41054A26 A

7
MODEL 1054A pH SECTION 2.0
INSTALLATION
FIGURE 2-3.Wall Mounting J-Box Installation
DWG. NO. REV.
41054A27 A
ITEM PART NUMBER DESCRIPTION QUANTITY
1 23058-01 S Assy, J-Box 1
2 33030-00 Bracket, wall mtg 1
3 9900600 Nut, 6-32 Hex 4
4 9910600 Washer, Flat #6 4
5 9910610 Washer, Lock Int. #6 8
6 9600612 Screw, 6-32 X .75 4
7 9510048 Seal, Weathertight 1

MODEL 1054A pH SECTION 2.0
INSTALLATION
8
FIGURE 2-4.Wall Mounting J-Box Wiring
DWG. NO. REV.
41054A08 B
WHEN INCH AND METRIC DIMS
ARE GIVEN
MILLIMETER
INCH

MODEL 1054A pH SECTION 2.0
INSTALLATION
9
FIGURE 2-5. Pipe Mounting Installation
WHEN INCH AND METRIC DIMS
ARE GIVEN
MILLIMETER
INCH
DWG. NO. REV.
41054A02 C

MODEL 1054A pH SECTION 2.0
INSTALLATION
10
FIGURE 2-6.Wall Mount Enclosure Dimensions and Mounting
DWG. NO. REV.
41054A12 D
WHEN INCH AND METRIC DIMS
ARE GIVEN
MILLIMETER
INCH

MODEL 1054A pH SECTION 2.0
INSTALLATION
11
FIGURE 2-7. Electrical Wiring
DWG. NO. REV.
41054A03 A

MODEL 1054A pH SECTION 2.0
INSTALLATION
12
FIGURE 2-8. Integral Preamp Wiring for Group I Panel Mount Enclosure
DWG. NO. REV.
41054A04 B

13
MODEL 1054A pH SECTION 2.0
INSTALLATION
FIGURE 2-9. Integral Preamp Wiring for Group II Wall Mount Enclosure
DWG. NO. REV.
41054A14 A

15
MODEL 1054A pH SECTION 3.0
DESCRIPTION OF CONTROLS
SECTION 3.0
DESCRIPTION OF CONTROLS
3.1 KEYBOARD FUNCTIONS. All functions of the
1054A pH are accessed through keyboard entry
routines. The analyzer uses no switches or poten-
tiometers.
The four keys across the top row and the CAL and
ENTER keys are dual function. One press of the key
will display the value of the function shown on the
lower portion of the key. A quick double press of the
key will display the value of the function shown on the
upper portion of the key. Each of these keys have
read functions that can be accessed without security
code entry. Each key also has a calibration or set
function when used with the SELECT key. This func-
tion requires entry of the security code when the
security feature is active. (Refer to Section 6.0 for key-
board security.)
NOTE
When no key is pressed for a period of 60
seconds the analyzer will default to read-
ing pH.
CAUTION
The HOLD function and the CAL function
are not read functions. Refer to section 5.3.
A. Standardize pH. Standardization of the pH sensor
is achieved by pressing the pH key
once, followed immediately by pressing
the SELECT key. “Std” displays to
acknowledge the standardize function,
followed by the Numeric Display for user
input. Entering the known pH of the measured solu-
tion will cause the analyzer to restandardize the sen-
sor. The slope value will not be changed. Refer to
Section 5.4.
B. Standardize Temperature. Standardization of the
temperature is achieved by pressing the
TEMP key once, followed immediately
by pressing the SELECT key. “AdJ” dis-
plays to acknowledge the standardiza-
tion function, followed by the Numeric
Display for user input. Entering the known tempera-
ture of the measured solution will cause the analyzer
to restandardize the temperature reading. Refer to
Section 5.2.
C. Alarm 1 and Alarm 2 Setpoint. The
alarm setpoint may be adjusted by
pressing the ALARM 1 or ALARM 2 key
once, followed by pressing the SELECT
key. “AdJ” displays, followed by the
Numeric Display for user input. Refer to Section 4.10.
D. Current Output – Zero Setpoint. The
zero point (0 or 4 mA) of the pH output
range is adjusted by pressing the ZERO
key twice, followed by pressing the
SELECT key. “AdJ” displays, followed by
the Numeric Display for user input. Refer to Section 4.11.
E. Current Output – F.S. Setpoint. The
full scale point (20 mA) of the pH output
range is adjusted by pressing the F.S.
key twice, followed by pressing the
SELECT key. “AdJ” displays, followed by
the Numeric Display for user input. The full scale set-
point for the other output. Refer to Section 4.11.
F. Two Buffer Calibration. A two buffer
calibration is initiated by pressing the
CAL key once. Refer to Section 5.3.
G. pH Glass Slope. The millivolt output
per pH unit is adjusted by pressing the
SLOPE key twice, followed by pressing
the SELECT key once. “AdJ” displays,
followed by the Numeric Display for user
input. Refer to Section 5.5.
H. Simulate Current Output. The pH
output can be simulated by pressing the
OUTPUT key twice, followed by pressing
the SELECT key. The Numeric Display
appears for user input. Refer to Section
4.12.
ZERO
ALARM 1
OUTPUT
pH
HOLD
TEMP
SLOPE
CAL
ZERO
ALARM 1
F.S.
ALARM 1
OUTPUT
pH
SLOPE
CAL

16
MODEL 1054A pH SECTION 3.0
DESCRIPTION OF CONTROLS
3.1.1 Item Selection and Value Adjustment Keys.
The three keys located on the lower right side of the
keypad are used for menu navigation, value adjust-
ment and entry, and item selection. These keys per-
form the following functions:
A. SELECT/Shift () Key. This key is
used to select the displayed menu, or for
shifting to the next digit in the Numeric
Display.
B. Scroll Key (▲). This key is used to
scroll through menu when selected, or
scroll through digits on the active (flash-
ing) Numeric Display. Holding key down
auto scrolls through the main menu and
Numeric display.
C. ACCESS/ENTER Key. This key is
used to ACCESS the Set Mode (Section
4.1.2) and to ENTER the displayed value
into memory (from Numeric Display).

SELECT

ACCESS
ENTER
FIGURE 3-1. Keyboard Overlay