Analytical Technology Q46P User Manual

Model Q46P

pH Monitor

Home Office European Office

Analytical Technology, Inc. ATI (UK) Limited
6 Iron Bridge Drive Unit 1 & 2 Gatehead Business Park
Collegeville, PA 19426 Delph New Road, Delph
Saddleworth OL3 5DE
Ph: 800-959-0299 Ph: [phone]
610-917-0991
Fax: [phone] Fax: + 44 (0)1457-874-468
Email: [e-mail] Email:[e-mail]

PRODUCT WARRANTY

Analytical Technology, Inc. (Manufacturer) warrants to the Customer that if any part(s)
of the Manufacturer's products proves to be defective in materials or workmanship
within the earlier of 18 months of the date of shipment or 12 months of the date of start­up, such defective parts will be repaired or replaced free of charge. Inspection and
repairs to products thought to be defective within the warranty period will be completed
at the Manufacturer's facilities in Collegeville, PA. Products on which warranty repairs
are required shall be shipped freight prepaid to the Manufacturer. The product(s) will be
returned freight prepaid and allowed if it is determined by the manufacturer that the
part(s) failed due to defective materials or workmanship.

This warranty does not cover consumable items, batteries, or wear items subject to
periodic replacement including lamps and fuses.

Gas sensors, except oxygen sensors, are covered by this warranty, but are subject to
inspection for evidence of extended exposure to excessive gas concentrations. Should
inspection indicate that sensors have been expended rather than failed prematurely, the
warranty shall not apply.

The Manufacturer assumes no liability for consequential damages of any kind, and the
buyer by acceptance of this equipment will assume all liability for the consequences of
its use or misuse by the Customer, his employees, or others. A defect within the
meaning of this warranty is any part of any piece of a Manufacturer's product which
shall, when such part is capable of being renewed, repaired, or replaced, operate to
condemn such piece of equipment.

This warranty is in lieu of all other warranties (including without limiting the generality of
the foregoing warranties of merchantability and fitness for a particular purpose),
guarantees, obligations or liabilities expressed or implied by the Manufacturer or its
representatives and by statute or rule of law.

This warranty is void if the Manufacturer's product(s) has been subject to misuse or
abuse, or has not been operated or stored in accordance with instructions, or if the
serial number has been removed.

Analytical Technology, Inc. makes no other warranty expressed or implied except as
stated above.

Table of Contents

PART 1 - INTRODUCTION .................................. 4

1.1 General ............................................ 4

1.2 Features .......................................... 5

1.3 Q46P System Specifications ............ 6

1.4 Q46P Performance Specifications

(Common to all variations)................. 7

1.5 General – Q25P pH Sensor ............. 8

1.6 Sensor Features .............................. 8

1.7 Q25P Sensor Specifications ............ 9

PART 2 – ANALYZER MOUNTING ................... 11

2.1 General .......................................... 11

2.2 Wall or Pipe Mount ......................... 12

2.3 Panel Mounting .............................. 14

PART 3 – SENSOR/FLOWCELL MOUNTING .. 15

3.1 General .......................................... 15

3.2 Flow Tee Mounting ........................ 16

3.3 Union Mounting .............................. 17

3.4 Submersion Mounting .................... 18

3.5 Insertion Mounting ......................... 19

3.6 Conventional pH Sensors .............. 21

3.61 Sealed Flowcell .............................. 22

3.62 Flow Tee Adapter ........................... 23

3.7 Lock-n-Load System ...................... 24

PART 4 – ELECTRICAL INSTALLATION ......... 25

4.1 General .......................................... 25

4.2 Power Connection .......................... 26

4.3 Relay Connection ........................... 28

4.4 Optional Output or Relay

Connections .................................... 29

4.5 Sensor Wiring ................................ 30

4.6 Direct Sensor Connection .............. 33

4.7 Junction Box Connection ............... 34

4.8 Combination Electrode Connection . 35

4.9 External Preamplifier ...................... 37

PART 5 – CONFIGURATION ............................. 38

5.1 User Interface ................................. 38

5.11 Keys ............................................... 39

5.12 Display ........................................... 39

5.2 Software ......................................... 41

5.21 Software Navigation ...................... 41

5.22 Measure Menu [MEASURE] ........... 44

5.23 Calibration Menu [CAL] .................. 45

5.24 Configuration Menu [CONFIG] ....... 46

5.25 Control Menu [CONTROL] ............. 52

5.26 Diagnostics Menu [DIAG] .............. 59

PART 6 – CALIBRATION .................................. 64

6.1 Overview and Methods ................... 64

6.11 Sensor Slope .................................. 64

6.12 Sensor Offset ................................. 65

6.13 2-Point Calibration Explained ......... 65

6.14 1-Point Calibration Explained ......... 65

6.2 Performing a 2-Point Calibration ..... 66

6.3 Performing a 1-Point Calibration ..... 67

6.4 Temperature Calibration ................. 69

PART 7 – PID CONTROLLER DETAILS ........... 70

7.1 PID Description .............................. 70

7.2 PID Algorithm ................................. 70

7.3 Classical PID Tuning ...................... 72

7.4 Manual PID Override Control ......... 73

7.5 Common PID Pitfalls ...................... 73

PART 8 – MAINTENANCE AND

TROUBLESHOOTING ....................................... 75

8.1 System Checks .............................. 75

8.2 Instrument Checks ......................... 75

8.3 Display Messages .......................... 76

8.4 Cleaning the Sensor ....................... 80

8.5 Replacing the Saltbridge and

Reference Buffer Solution ....................... 81

8.6 Troubleshooting ............................. 82

SPARE PARTS .................................................. 84

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Table of Figures

FIGURE 1 – Q46 ENCLOSURE DIMENSIONS .................................................................................. 11

FIGURE 2 - WALL OR PIPE MOUNTING BRACKET ........................................................................... 12

FIGURE 3 - WALL MOUNTING DIAGRAM ........................................................................................ 13

FIGURE 4 - PIPE MOUNTING DIAGRAM .......................................................................................... 13

FIGURE 5 - 115/230 VAC PANEL MOUNT & CUT-OUT ................................................................... 14

FIGURE 6 - Q25 SENSOR TYPES .................................................................................................. 15

FIGURE 7 - FLOW THROUGH TEE MOUNT ..................................................................................... 16

FIGURE 8 - 1.5" UNION MOUNT .................................................................................................... 17

FIGURE 9 - SENSOR SUBMERSION MOUNT ................................................................................... 18

FIGURE 10 - S.S. SENSOR INSERTION MOUNT .............................................................................. 19

FIGURE 11 - CPVC SENSOR INSERTION MOUNT ........................................................................... 20

FIGURE 12 - (63-0013) COMBINATION PH SENSOR, FLOW TYPE .................................................... 21

FIGURE 13 - (63-0009) COMBINATION PH SENSOR, SUB. TYPE ..................................................... 21

FIGURE 14 - SEALED FLOWCELL DETAILS ..................................................................................... 22

FIGURE 15 - TWIST-LOCK FLOW TEE ........................................................................................... 23

FIGURE 16 - LOCK-N-LOAD SENSOR EXPLODED VIEW ................................................................... 24

FIGURE 17 – Q46 CONNECTIONS ................................................................................................ 27

FIGURE 18 – Q46 RELAY CONNECTIONS ...................................................................................... 28

FIGURE 19 - OPTIONAL RELAY BOARD WIRING ............................................................................. 29

FIGURE 20 - OPTIONAL ANALOG OUTPUT WIRING ......................................................................... 29

FIGURE 21 - CABLE DESCRIPTION, MODEL Q25P ......................................................................... 30

FIGURE 22 - DETACHABLE SINGLE SHIELDED CABLE, MODEL Q25P .............................................. 31

FIGURE 23 - Q46P SENSOR CONNECTIONS ................................................................................. 32

FIGURE 24 - SENSOR CABLE PREPARATION ................................................................................. 33

FIGURE 25 - JUNCTION BOX INTERCONNECT WIRING .................................................................... 34

FIGURE 26 – OEM SENSOR CONNECTIONS, COMBINATION ELECTRODES ...................................... 35

FIGURE 27 – ATI COMBINATION ELECTRODE CONNECTIONS ......................................................... 36

FIGURE 28 - EXTERNAL PREAMP FOR CONVENTIONAL SENSOR WIRING ......................................... 37

FIGURE 29 - USER INTERFACE ..................................................................................................... 38

FIGURE 30 - SOFTWARE MAP ...................................................................................................... 43

FIGURE 31 - AUTOMATIC PH BUFFER TABLES ............................................................................... 48

FIGURE 32 - AUTOMATIC PH BUFFER TABLES (CONT’D) ................................................................ 49

FIGURE 33 - CONTROL RELAY EXAMPLE, HYSTERESIS AND OPPOSITE PHASE ................................ 56

FIGURE 34 - ALARM RELAY EXAMPLE .......................................................................................... 57

FIGURE 35 - Q45H ISA (IDEAL) PID EQUATION ............................................................................ 71

FIGURE 36 - REPLACING THE SALTBRIDGE AND REFERENCE BUFFER ............................................ 81

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Part 1 - Introduction

1.1 General

The Model Q46P provides continuous measurement of pH in aqueous systems.
It is suitable for potable water, wastewater, and a wide variety of process water
applications. Q46P monitors may be used with Q25P “differential” pH sensors or
a variety of conventional “combination” pH sensors.

Monitors are available in two electronic versions, a universal AC powered
monitor for operation from 90-260 VAC and a 12-24 VDC unit. Both versions
provide two 4-20 mA analog outputs and 3 SPDT relays. One analog output may
be configured for PID control and one of the relays may be configured to provide
a remote trouble indication.

The Q46P is available with a few options to expand the capabilities of the
monitor. Users may select either a third analog 4-20 mA output or an expansion
card that provides three additional low voltage SPST relays. The expansion
relays are not isolated from each other.

This monitor also provides digital communication capability. Users may order
Q46 systems with either Profibus DP, Modbus RTU, or Ethernet communications
boards factory installed.

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ATI Q46P pH System Part 1 – Introduction

1.2 Features

· Standard Q46P Analyzers have fully isolated inputs and outputs. Analog outputs

are additionally completely isolated from each other.

· Available in either 90-260 VAC or 12-24 VDC power supply systems. All features

remain the same in both variations.

· Output Hold, Output Simulate, Output Alarm, and Output Delay Functions. All

forced changes in output condition include bumpless transfer for gradual return to
on-line signal levels to avoid system control shocks on both analog outputs.

· Three 6 amp SPDT relay outputs and two analog 4-20 mA outputs are standard.

Software settings for relay control include setpoint, deadband, phase, delay, and
failsafe. An optional 3-relay card, for 0-30 V signals, is available to bring the total
to 6 relays.

· Selectable PID controller on main analog output. PID controller can operate with

instrument configured as loop-power analyzer or as one of the two outputs on the
AC powered instrument. PID includes manual operation feature, and diagnostic
“stuck-controller” timer feature for alarm output of control problems.

· Digital communication option for Profibus-DP, Modbus-RTU. More versions

pending. See Q46 Digital Communications Manual for Specifications.

· Two analog outputs may be configured to track pH and temperature. Both

analog outputs can be individually programmed to fail to specific values. An
optional third output is available, providing separate outputs for pH or
Temperature.

· Low voltage relay expansion board provides for analyzer control of the optional

“air blast” sensor cleaning system available for submersion applications.

· Sensor diagnostics monitor glass breakage, sensor leaks, and RTD condition.

Diagnostic messages provide a clear description of problems.

· Two-point and sample calibration methods include auto-buffer recognition from

13 built-in buffer tables, with stability checks during calibration.

· Selectable Pt1000 or Pt100 temperature inputs.

· Security lock feature to prevent unauthorized tampering.

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ATI Q46P pH System Part 1 – Introduction

1.3 Q46P System Specifications

Displayed Parameters Main input, 0.00 to 14.00 pH

Sensor temperature, -10.0 to 110.0 °C (14 to 230ºF)

Loop current, 4.00 to 20.00 mA
Sensor slope/offset
Model number and software version

Enclosure NEMA 4X, polycarbonate, stainless steel hardware,

Mounting Options Wall or pipe mount bracket standard. Bracket suitable for

Weight 2 lb. (0.9 kg)

Display 0.75” (19.1 mm) high 4-digit main display with sign
12-digit secondary display, 0.3" (7.6 mm) 5x7 dot matrix.

Integral LED back-light for visibility in the dark.

Keypad 4-key membrane type, polycarbonate

Ambient Temperature Service, -20 to 60 °C (-4 to 140 ºF)

Storage, -30 to 70 °C (-22 to 158 ºF)

Ambient Humidity 0 to 95%, indoor/outdoor use, non-condensing.

Altitude Up to 2000 m (6562 Ft.)

Electrical Certification Ordinary Location, cCSAus (CSA and UL standards - both

EMI/RFI Influence Designed to EN 61326-1

Output Isolation 600 V galvanic isolation

Filter (Damping) Adjustable 0-9.9 minutes damping to 90% step input

Temperature Input Selectable Pt1000 or Pt100 RTD with automatic compensation

Power 90 - 260 VAC, 50-60 Hz, 10 VA max

12-24 VDC, 500 mA max.

weatherproof and corrosion resistant.

either 1.5” or 2” I.D. U-Bolts for pipe mounting. Panel
mounting bracket optional.

approved by CSA), pollution degree 2, installation category 2

change.

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ATI Q46P pH System Part 1 – Introduction

Enclosure NEMA 4X, polycarbonate, stainless steel hardware,

weatherproof and corrosion resistant.

Mounting Options Wall or pipe mount bracket standard. Bracket suitable for

either 1.5” or 2” I.D. U-Bolts for pipe mounting.

Panel mount adapter optional.

Conduit Openings Five ½” NPT openings, Adapter can be removed to

provide a 1” NPT opening in the bottom of the enclosure.
Gland seals provided but not installed.

Relays, Electromechanical: Three SPDT, 6 amp @ 250 VAC, 5 amp @ 24 VDC

contacts. Software selection for setpoint, phase, delay,
deadband, hi-lo alarm, and failsafe.A-B indicators on main
LCD, and C indicator on lower display.

Expansion Relays: Optional relay board with 3 SPST low power relays.

Relays rated 2A @ 30 VDC. Relays are not isolated.

Analog Outputs Two 4-20 mA outputs. Output one programmable for pH or

PID. Output 2 programmable for pH or Temperature. Max
load 500 Ohms for each output. Outputs ground isolated
and isolated from each other. An additional 3rd analog
option is available.

1.4 Q46P Performance Specifications (Common to all variations)

Accuracy 0.1% of span or better (± 0.01 pH)

Repeatability 0.1% of span or better (± 0.01 pH)

Sensitivity 0.05% of span (± 0.01 pH)

Stability 0.05% of span per 24 hours, non-cumulative

Supply Voltage Effects ± 0.05% span

Instrument Response Time 6 seconds to 90% of step input at lowest setting

Temperature Drift Span or zero, 0.02% of span/°C

Max. Sensor-Instrument 3,000 ft. (914 meters) w/ preamp,
Distance 30 ft. (9.1 meters) w/o preamp

Sensor Types Model Q25P pH w/ preamp - 5 wire input, or combination

style pH electrode w/ TC

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ATI Q46P pH System Part 1 – Introduction

1.5 General – Q25P pH Sensor

Model Q25P “differential” pH sensors are the most commonly used sensors with
the Q46P monitor. The differential design utilizes a second glass measuring
electrode contained in an internal buffer as the reference element. This
eliminates the need for a silver/silver chloride reference used in conventional pH
sensor designs. It is designed to perform in the harshest of environments,
including applications that poison conventional pH sensors. All seals are dual
o-ring using multiple sealing materials.

Q25P sensors are available with a choice of two glass types. For the most
demanding industrial applications, P1 glass should be used. This glass is thicker
and will last longer in higher temperature and pressure applications. On the
other hand, P1 glass has a very high impedance and is not suggested for use in
very cold applications. P2 glass is a good general purpose glass that is better for
drinking water, wastewater, and low temperature industrial applications. This
glass is somewhat thinner with lower impendence and can handle cold water
more easily. Note that the salt bridge is different for these two sensors.

1.6 Sensor Features

· A high volume, dual junction saltbridge to maximize the in-service lifetime of

the sensor. The annular junction provides a large surface area to minimize
the chance of fouling. Large electrolyte volume and dual reference junctions
minimize contamination. The saltbridge is replaceable.

· An integral preamplifier encapsulated provides a low impedance signal output

which ensures stable readings in noisy environments. Sensor to transmitter
separation can be up to 3,000 feet (914 meters).

· Pt1000 RTD. The temperature element used in ATI sensors is highly

accurate and provides a highly linear output.

· Available in various configurations including submersible, flow type with quick

disconnect, sanitary, and insertion.

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ATI Q46P pH System Part 1 – Introduction

1.7 Q25P Sensor Specifications

Measuring Range 0 to 14.00 pH

Sensitivity 0.01 pH

Stability 0.02 pH per 24 hours, non-cumulative

Wetted Materials PEEK, ceramic, titanium, glass, Viton, EDPM

(optional: 316 stainless steel body)

Temperature Compensation Pt1000 RTD

Sensor Cable 6 Conductor (5 are used) plus 2 shields,

15 feet (4.6 meters) standard length

Temperature Range -5 to +95 °C (23 to 203 °F)

Pressure Range 0 to 100 psig

Maximum Flow Rate 10 feet (3 meters) per second

Sensor to Analyzer Distance 3,000 feet (914 meters) maximum

Sensor Body Options 1” NPT convertible, 1¼” insertion, 1½” or 2” sanitary-style

Weight 1 lb. (0.45 kg)

Notes: 1. The type of hardware used to mount the sensor may limit the maximum

temperature and pressure ratings. Please consult the hardware
manufacturer’s specifications to obtain the relevant temperature and pressure
rating information.

2. The maximum flow rate specification is lower for process solutions with low
ionic conductivity or high suspended solids concentration. High flow rates in
low ionic conductivity processes may cause a measurement error due to static
electrical discharge. High flow rates in processes with high suspended solids
concentration may decrease the functional life of the sensor by eroding the
pH-sensitive glass electrode.

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ATI Q46P pH System Part 1 – Introduction

1.8 Important Sensor Notes

· The glass electrode must be wetted at all times to ensure proper functionality.

Q25P sensors are shipped with a fluid-filled cap over the electrode to enable
immediate use (remove cap before installing, save for storage and shipping
purposes). Electrodes that have dried out for any reason should be hydrated
for 24 hours to restore full functionality.

· Hydrofluoric acid (HF) will dissolve conventional glass electrodes. For

applications involving hydrofluoric acid, a pH sensor with antimony electrode
is recommended.

NOTE: The standard Q25P process electrode is made of glass and can break if

not handled properly. Should the electrode ever break, USE CAUTION
when handling the sensor to avoid serious cuts.

Equipment bearing this marking may not be discarded by traditional
methods in the European community after August 12 2005 per EU
Directive 2002/96/EC. End users must return old equipment to the
manufacturer for proper disposal.

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Part 2 – Analyzer Mounting

2.1 General

All Q46 Series instruments provide for mounting flexibility. A bracket is included
that allows mounting to walls or pipes. In all cases, choose a location that is
readily accessible for calibrations. Also consider that it may be necessary to
utilize a location where solutions can be used during the calibration process. To
take full advantage of the high contrast display, mount the instrument in a
location where the display can be viewed from various angles and long
distances.

Locate the instrument in close proximity to the point of sensor installation - this
will allow easy access during calibration. The standard cable length of the pH
sensor is 15 feet. For sensor cables longer than 30 feet, use the optional
junction box (07-0100) and sensor interconnect cable (31-0057).

Figure 1 – Q46 Enclosure Dimensions

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ATI Q46P pH System Part 2 – Mounting

2.2 Wall or Pipe Mount

A PVC mounting bracket with attachment screws is supplied with each
transmitter. The multi-purpose bracket is attached to the rear of the enclosure
using the four flat head screws. The instrument is then attached to the wall using
the four outer mounting holes in the bracket. These holes are slotted to
accommodate two sizes of u-bolt that may be used to pipe mount the unit. Slots
will accommodate u-bolts designed for 1½ “or 2” pipe. The actual center to
center dimensions for the u-bolts are shown in the drawing. Note that these slots
are for u-bolts with ¼-20 threads. The 1½” pipe u-bolt (2” I.D. clearance) is
available from ATI in type 304 stainless steel under part number (47-0005).

Figure 2 - Wall or Pipe Mounting Bracket

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ATI Q46P pH System Part 2 – Mounting

Figure 3 - Wall Mounting Diagram

Note: Analyzer shown with optional
Profibus Connector mounted to
side of enclosure.

Figure 4 - Pipe Mounting Diagram

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ATI Q46P pH System Part 2 – Mounting

2.3 Panel Mounting

Panel mounting uses the panel mounting flange molded into the rear section of
the enclosure. Figure 5 provides dimensions for the panel cutout required for
mounting.

The panel mounting bracket kit must be ordered separately (part number 05-

0094). This kit contains a metal retainer bracket that attaches to the rear of the
enclosure, 4 screws for attachment of this bracket, and a sealing gasket to insure
that the panel mounted monitor provides a water tight seal when mounted to a
panel.

The sealing gasket must first be attached to the enclosure. The gasket contains
an adhesive on one side so that it remains in place on the enclosure. Remove
the protective paper from the adhesive side of the gasket and slide the gasket
over the back of the enclosure so that the adhesive side lines up with the back of
the enclosure flange. Once in place, you can proceed to mount the monitor in
the panel.

Figure 5 - 115/230 VAC Panel Mount & Cut-out

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3.1 General

The Q25P pH Sensor mounting options include flow-through, submersion,
insertion (special hardware required), or sanitary mount depending on the type of
sensor purchased.

Q25P Differential pH Sensors are available in 4 different versions as shown in
Figure 6. The convertible style is the most common and can be used for either
flow-through or submersion applications. A convertible sensor with a quick­disconnect receptacle is available. This version may not be submerged and
should not be used in unprotected outdoor locations. For special applications,
the Q25P is also available in a stainless steel bodied version for insertion type
installations, or can be supplied in either 1.5” or 2” sanitary versions.

Part 3 – Sensor/Flowcell Mounting

Figure 6 - Q25 Sensor Types

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.2 Flow Tee Mounting

Convertible sensors may be used in a 1” flow tee as shown in Figure 7. The flow
tee is a modified pipe fitting that accommodates the pipe thread on the front of
the sensor. Sample must flow directly against the face of the sensor as shown.
The sensor may be mounted horizontally provided that the outlet flow is pointed
up to avoid “air locking” in the tee. Note that standard 1” tee fittings will not work
without modification due to clearance problems in most molded tees.

Figure 7 - Flow Through Tee Mount

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

Q45P

SENSOR

1½ UNION

1½ NIPPLE

1 ½ TEE

SUPPLIED)

1½ UNION

1½ NIPPLE

1 ½ TEE

SUPPLIED)

3.3 Union Mounting

For mounting the sensor in larger pipe and allowing for easy sensor removal, a 1
½” or 2” union mount adapter system is available. This arrangement allows
connection of the sensor to pipe sizes up to 2 inches (using adapters if
necessary) while allowing easy removal without twisting sensor wires. Contact
ATI for part numbers and prices for union mount assemblies and associated pipe
tees. The 1 ½” assembly is shown below. The 2” tee assembly is similar.

(CUSTOMER

(CUSTOMER

Figure 8 - 1.5" Union Mount

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.4 Submersion Mounting

When using this sensor for submersion applications, mount the sensor to the end
of a 1” mounting pipe using a 1” coupling. ATI’s (00-0628) mounting assembly
shown in Figure 9 is available for submersible applications. This assembly is
designed to mount to standard handrails and facilitates insertion and removal of
the sensor.

Figure 9 - Sensor Submersion Mount

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.5 Insertion Mounting

Special insertion mounting hardware is available for applications requiring the
removal of the sensor from a process line or tank without shutting off the sample
flow in the line. Figure 10 & Figure 11 show typical insertion assemblies.

Figure 10 - S.S. Sensor Insertion Mount

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

Figure 11 - CPVC Sensor Insertion Mount

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.6 Conventional pH Sensors

As indicated previously, Model Q46P transmitters may be used with standard
combination pH sensors available from a variety of manufacturers. For simple
clean water applications, these lower cost sensors may be all that’s needed for
reliable monitoring. ATI offers a few of these types of sensors as standard items
and can assist with the selection of special sensors should the need arise.

Figure 12 below show the dimensions of two pH sensors frequently used with the
Q46P. The 63-0013 sensor is suitable for use with either a pipe tee adapter or a
special clear acrylic sealed flowcell.

The 63-0009 pH sensor with flat glass tip is suitable for submersion use, or for
screwing directly into a pipe tee. If using in a tee, be careful to allow for enough
slack cable so that the cable does not twist excessively.

Figure 12 - (63-0013) Combination pH Sensor, Flow Type

Figure 13 - (63-0009) Combination pH Sensor, Sub. Type

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.61 Sealed Flowcell

For applications where a flowcell is desired, a sealed flowcell (00-1527) shown in
Figure 14 is available. This flowcell is used only with sensor (63-0005) or (63-

0013) and may be used for sample pressures up to 75 PSIG. The sample flow
should be controlled to 300-800 cc/min. When using this flowcell for pH
measurement, put the flow control valve AFTER the flowcell. This will maintain
sample pressure through the flowcell and avoid “degassing” of the sample.
Degassing can lead to bubbles on the end of the sensor which will cause erratic
readings. If degassing cannot be avoided, mount the flowcell horizontally

with the inlet on the side and the outlet on the top so that air bubbles
naturally flow away from the sensor tip.

Figure 14 - Sealed Flowcell Details

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.62 Flow Tee Adapter

When using the 63-0013 sensor in a flow application, a 1” or ¾” pipe tee adapter
is required. Figure 15 shows a detail of that arrangement.

Figure 15 - Twist-Lock Flow Tee

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ATI Q46P pH System Part 3 – Sensor/Flowcell Mounting

3.7 Lock-n-Load System

A special sensor/flowcell system is available that allows insertion and removal of
a pH sensor under flow conditions. Called a Lock-n-Load system, this assembly
uses a 2” flow tee and special sensor holder that retracts the sensor from a
flowing sample for maintenance and cleaning. It is simpler than an insertion
assembly and is very useful in lower pressure and clean water applications.

Figure 16 - Lock-n-Load Sensor Exploded View

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Part 4 – Electrical Installation

4.1 General

The Q46 is powered in one of two ways, depending on the version purchased.
The 12-24 VDC powered analyzer requires a customer supplied DC power
supply. The 90-260 VAC version requires line power. Please verify the type of
unit before connecting any power.

WARNING: Do not connect AC line power to the DC version. Severe

damage will result.

Important Notes:

1. Use wiring practices that conform to all national, state and local
electrical codes. For proper safety as well as stable measuring
performance, it is important that the earth ground connection be made
to a solid ground point from TB7. The AC power supply contains a
single 630mA slo-blo fuse (Wickmann/Littlefuse #372-0630). The fuse
F1 is located adjacent to TB7 and is easily replaceable.

2. Do NOT run sensor cables or instrument 4-20 mA output wiring in the
same conduit that contains AC power wiring. AC power wiring should
be run in a dedicated conduit to prevent electrical noise from coupling
with the instrumentation signals.

3. This analyzer must be installed by specifically trained personnel in
accordance with relevant local codes and instructions contained in this
operating manual. Observe the analyzer's technical specifications and
input ratings. Proper electrical disconnection means must be provided
prior to the electrical power connected to this instrument, such as a
circuit breaker - rated 250 VAC, 2 A minimum. If one line of the line
power mains is not neutral, use a double-pole mains switch to
disconnect the analyzer.

4. Repeated problems with lightning strikes damaging sensitive
instrumentation are often attributed to poorly bonded earth grounds in
the instrument power source. The protection schemes incorporated
into this analyzer cannot operate to maximum efficiency unless the
ground connection is at its’ absolute lowest impedance.

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ATI Q46P pH System Part 4 – Electrical Installation

WARNING

Disconnect line power voltage BEFORE connecting

er wires to Terminal TB7 of the power supply.

wire

single phase power. AC power supplies are

260 VAC operation at the factory at

time of order, and the power supply is labeled as

T connect voltages other than the

There is no standard ground resistance universally recognized. Many
agencies recommend a ground resistance value of 5 ohms or less.
The NEC recommends an impedance to ground of less than 25 ohms,
and less than 5 ohms where sensitive equipment is installed. Power
sources feeding sensitive instruments like the Q46H/79PR should have
the lowest possible impedance to ground.

4.2 Power Connection

Verify the AC power supply requirement before installing. Also verify that power
is fully disconnected before attempting to wire.

Q46 systems are supplied with 5 cable gland fittings for sealing cable entries.

Connect HOT, NEUTRAL, and GROUND to the matching designations on
terminal strip TB7.

The two analog outputs for the standard system are present at terminal TB1.
The loop-load limitation in this configuration is 500 Ohms maximum for each
output. Also note that these two outputs are completely isolated from each other
to insure that ground loops do not result from the connection of both outputs to
the same device such as a PLC or DCS.

A ribbon cable connects the power supply assembly with the microprocessor
assembly located in the front section of the enclosure. This cable may be
unplugged from the front section of the monitor if service is needed, but should
normally be left in place during installation.

line pow
The power supply accepts only standard three-

configured for 90-

such. Do NO
labeled requirement to the input.

26
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ATI Q46P pH System Part 4 – Electrical Installation

Figure 17 – Q46 Connections

The power strip, TB7, allows up to 12 AWG wire. A wire gauge of 16 AWG is
recommended to allow for an easy pass-through into the ½” NPT ports when
wiring.

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ATI Q46P pH System Part 4 – Electrical Installation

4.3 Relay Connection

Three SPDT relays are provided on the power supply board. None of the relay
contacts are powered. The user must supply the proper power to the contacts.
For applications that require the same switched operating voltage as the Q46
(115 or 230 V), power may be jumpered from the power input terminals at TB7.
Relay wiring is connected at TB4, TB5, and TB6 as shown below. Note that the
relay contact markings are shown in the NORMAL mode. Programming a relay
for “Failsafe” operation reverses the NO and NC positions in this diagram (Figure

18).

Figure 18 – Q46 Relay Connections

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ATI Q46P pH System Part 4 – Electrical Installation

4.4 Optional Output or Relay Connections

TB2, is used to connect to the optional 3-relay card (Figure 19) OR the optional

third analog output Out#3, (Figure 20). The Q46 can be configured for only one
of these optional features, and the hardware for either option must be factory
installed.

Figure 19 - Optional Relay Board Wiring

Figure 20 - Optional Analog Output Wiring

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ATI Q46P pH System Part 4 – Electrical Installation

4.5 Sensor Wiring

The sensor cable can be quickly connected to the Q46 terminal strip by matching
the wire colors on the cable to the color designations on the label in the monitor.
A junction box is also available to provide a break point for long sensor cable
runs. Route signal cable away from AC power lines, adjustable frequency drives,
motors, or other noisy electrical signal lines. Do not run sensor or signal cables
in conduit that contains AC power lines or motor leads.

Standard convertible sensors, insertion sensors, and sanitary sensors have cable
permanently attached to the sensor. This cable contains double shielded
conductors to minimize noise problems in heavy industrial environments.
Convertible sensors with connectors and flow type sensors use a slightly different
cable assembly with only a single shield. This assembly is sufficient for many
applications where EMI/RFI problems are not severe. Figure 21 and Figure 22
show the two different cable assembly terminations.

Figure 21 - Cable Description, Model Q25P

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ATI Q46P pH System Part 4 – Electrical Installation

RED - DRIVE ELECTRODE
BLACK - COMMON (GROUND)

GREEN - DRIVE ELECTRODE

ORANGE - TEMPERATURE COMPENSATION

WHITE - SENSE ELECTRODE

BLUE - NOT USED

CABLE SHIELD - EARTH GROUND

Figure 22 - Detachable Single Shielded Cable, Model Q25P

DANGER: DO NOT connect sensor cable to power lines. Serious injury
may result.

Take care to route sensor cable away from AC power lines, adjustable frequency
drives, motors, or other noisy electrical signal lines. Do not run signal lines in the
same conduit as AC power lines. Run signal cable in dedicated metal conduit if
possible. For optimum electrical noise protection, run an earth ground wire to the
ground terminal in the transmitter.

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ATI Q46P pH System Part 4 – Electrical Installation

NOTE: If sensor is experiencing Low-Slope or Low-Output conditions, due to

poor Earth Ground Connections, move the Shield connection from P/S
Board to alternate location on lid, where indicated with an “S”

Figure 23 - Q46P Sensor Connections

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ATI Q46P pH System Part 4 – Electrical Installation

4.6 Direct Sensor Connection

Sensor connections are made in accordance with Figure 23. The sensor

cable can be routed into the enclosure through one of cord-grips supplied
with the unit. Routing sensor wiring through conduit is only recommended
if a junction box is to be used. Some loose cable is needed near the
installation point so that the sensor can be inserted and removed easily
from the flowcell.

Cord-grips used for sealing the cable should be snugly tightened after

electrical connections have been made to prevent moisture incursion.
When stripping cables, leave adequate length for connections in the
transmitter enclosure as shown below. The standard 15 ft. sensor cable
normally supplied with the system is already stripped and ready for wiring.
This cable can be cut to a shorter length if desired to remove extra cable
in a given installation. Do not cut the cable so short as to make
installation and removal of the sensor difficult.

Figure 24 - Sensor Cable Preparation

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ATI Q46P pH System Part 4 – Electrical Installation

4.7 Junction Box Connection

For installations where the sensor is to be located more than 30 feet from the
monitor (max. 3000 feet), a junction box must be used. The junction box is
shown in
Figure 25, and is supplied with Pg 9 gland seals for sensor and interconnect
wiring installation.

NOTE: If sensor is experiencing Low-Slope or Low-Output conditions, due
to poor Earth Ground Connections, move the Shield connection from P/S
board to alternate location on lid, where indicated with an “S”.

Connecting sensor cable lengths can be up to 400 feet with a

2-wire RTD connection, and up to 3,000 feet with a 3-wire
RTD connection. Contact factory if 3-wire system is needed.

When utilizing the junction box connection, the blue wire on

the connecting sensor cable must be attached to Terminal 6
on the Q46 Transmitter, as above. However, the blue wire on
the Q25 Sensor cable is not used.

Use ONLY ATI 6-conductor Q25 Sensor interconnect cable

between the transmitter and the junction box.

Figure 25 - Junction Box Interconnect Wiring

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ATI Q46P pH System Part 4 – Electrical Installation

4.8 Combination Electrode Connection

The Q46P may also be used with non-amplified simple combination electrodes
(see Figure 26). Note that a wire jumper must be installed from Terminal 3 to
Terminal 8. The user must also select Sensor Type 2 within the Config Menu
(see Section 5.24). The maximum sensor-to-instrument cable length will be
severely limited (30-50 feet) with electrodes of this type. The length will depend
on the specific electrode impedance and the quality of interconnect cable
provided by the manufacturer.

Figure 26 – OEM Sensor Connections, Combination Electrodes

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ATI Q46P pH System Part 4 – Electrical Installation

Flow pH Probe (63-0013)

Submersible pH Probe (63-0009)

Connect ATI sensors listed above as follows:

Terminal 1 – Center clear (coax)
3 – Shield (coax)
7 – Red (Pt100)
8 – White and Green or Blue (Pt100)

Terminals 3 & 8 MUST be connected with a jumper wire

For Other Combination Electrodes connect as follows:

Terminal 1- Glass Electrode
3 - Reference Electrode
7 - PT100 or PT1000 Temp. Element
8 - PT100 or PT1000 Temp Element

Terminals 3 and 8 MUST be connected with jumper wire.

Figure 27 – ATI Combination Electrode Connections

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ATI Q46P pH System Part 4 – Electrical Installation

4.9 External Preamplifier

An external preamplifier (part no. 00-1391) is available which allows the
use of conventional pH sensors long distances from the Q46P electronics.
This preamp is housed in a NEMA 4X enclosure and must be located
within 25 ft. of the pH sensor. It is critical that any conduit entry installed
in this enclosure be completely sealed. Moisture entering the enclosure
through a conduit will cause failure of the amplifier circuit. Use of this
preamp. allows the Q46P to be located up to 300 metres from the
sensor/preamp. installation location. Wiring for that system is shown
below.

Figure 28 - External Preamp for Conventional Sensor Wiring

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ENTER

MENU ICONS

12-CHARACTER

Part 5 – Configuration

5.1 User Interface

The user interface for the Q46 Series instrument consists of a custom display
and a membrane keypad. All functions are accessed from this user interface (no
internal jumpers, pots, etc.).

SIGN

RELAY/LO-BAT

INDICATOR

4-KEY USER

INTERFACE

RELAY

INDICATOR

A

B

MENU

ESC

4-DIGIT

MAIN DISPLAY

MENU ICONS

CAL

UNITS

12-CHARACTER

SECONDARY

DISPLAY

MEMBRANE

KEYPAD

CONF

DIAG
FAIL

HOLD

UNITS

SECONDARY

DISPLAY

MEMBRANE

KEYPAD

MENU/ESCAPE

KEY

UP ARROW

KEY

Figure 29 - User Interface

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ENTER KEY

LEFT ARROW

KEY

38

ATI Q46P pH System Part 5 – Configuration

5.11 Keys

All user configurations occur through the use of four membrane keys. These
keys are used as follows:

MENU/ESC To scroll through the menu section headers or to escape

from anywhere in software. The escape sequence allows
the user to back out of any changes in a logical manner.
Using the escape key aborts all changes to the current
screen and backs the user out one level in the software tree.
The manual will refer to this key as either MENU or ESC,
depending upon its particular function.

UP (arrow) To scroll through individual list or display items and to

change number values.

LEFT (arrow) To move the cursor from right to left during changes to a

number value.

ENTER To select a menu section or list item for change and to store

any change.

5.12 Display

The large custom display provides clear information for general measurement
use and user configuration. There are three main areas of the display: the main
parameter display, the secondary message line, and the icon area.

Main Parameter During normal operation, the main parameter display

indicates the present process input with sign and units. This
main display may be configured to display any of the main
measurements that the system provides. During
configuration, this area displays other useful set-up
information to the user.

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ATI Q46P pH System Part 5 – Configuration

Lower Line During normal operation, the lower line of the display indicates

user-selected secondary measurements that the system is making.
This also includes calibration data from the last calibration
sequence and the transmitter model number and software version.
During configuration, the lower line displays menu items and set-up
prompts to the user. Finally, the lower line will display error
messages when necessary. For a description of all display
messages, refer to Section 8.3.

Icon Area The icon area contains display icons that assist the user in set-up

and indicate important states of system functions. The CAL,
CONFIG, and DIAG icons are used to tell the user what branch of
the software tree the user is in while scrolling through the menu
items. This improves software map navigation dramatically. Upon
entry into a menu, the title is displayed (such as CAL), and then the
title disappears to make way for the actual menu item. However,
the icon stays on.

HOLD The HOLD icon indicates that the current output of the transmitter

has been put into output hold. In this case, the output is locked to
the last input value measured when the HOLD function was
entered. HOLD values are retained even if the unit power is cycled.

FAIL The FAIL icon indicates that the system diagnostic function has

detected a problem that requires immediate attention. This icon is
automatically cleared once the problem has been resolved.

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ATI Q46P pH System Part 5 – Configuration

Relay Area A/B The relay area contains two icons that indicate the state of

the system relays. Relay C is normally configured for FAIL
indication, so it is only displayed on the lower MEASURE
display line.

5.2 Software

The software of the Q46P is organized in an easy to follow menu-based system.
All user settings are organized under five menu sections: Measure, Calibration
[CAL], Configuration [CONFIG], Control [CONTROL] and Diagnostics [DIAG].

Note: The default Measure Menu is display-only and has no menu icon.

5.21 Software Navigation

Within the CAL, CONFIG, CONTROL, and DIAG menu sections is a list of
selectable items. Once a menu section (such as CONFIG) has been selected
with the MENU key, the user can access the item list in this section by pressing
either the ENTER key or the UP arrow key. The list items can then be scrolled
through using the UP arrow key. Once the last item is reached, the list wraps
around and the first list item is shown again. The items in the menu sections are
organized such that more frequently used functions are first, while more
permanent function settings are later in the list. See Figure 30 for a visual
description of the software.

Each list item allows a change to a stored system variable. List items are
designed in one of two forms: simple single variable, or multiple variable
sequence. In the single variable format, the user can quickly modify one
parameter - for example, changing temperature display units from °F to °C. In
the multiple variable sequence, variables are changed as the result of some
process. For example, the calibration of pH generally requires more than one
piece of information to be entered. The majority of the menu items in the
software consist of the single variable format type.

A

B

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ATI Q46P pH System Part 5 – Configuration

Any data that may be changed will be flashing. This flashing indicates user entry
mode and is initiated by pressing the ENTER key. The UP arrow key will
increase a flashing digit from 0 to 9. The LEFT arrow key moves the flashing
digit from right to left. Once the change has been completed, pressing ENTER
again stores the variable and stops the flashing. Pressing ESC aborts the
change and also exits user entry mode.

The starting (default) screen is always the Measure Menu. The UP arrow key is
used to select the desired display. From anywhere in this section the user can
press the MENU key to select one of the four Menu Sections.

The UP arrow icon next to all list items on the display is a reminder to scroll
through the list using the UP arrow key.

To select a list item for modification, first select the proper menu with the MENU
key. Scroll to the list item with the UP arrow key and then press the ENTER key.
This tells the system that the user wishes to perform a change on that item. For
single item type screens, once the user presses the ENTER key, part or all of the
variable will begin to flash, indicating that the user may modify that variable using
the arrow keys. However, if the instrument is locked, the transmitter will display
the message Locked! and will not enter user entry mode. The instrument must
be unlocked by entering the proper code value to allow authorized changes to
user entered values. Once the variable has been reset, pressing the ENTER key
again causes the change to be stored and the flashing to stop. The message
Accepted! will be displayed if the change is within pre-defined variable limits. If
the user decides not to modify the value after it has already been partially
changed, pressing the ESC key aborts the modification and returns the entry to
its original stored value.

In a menu item which is a multiple variable sequence type, once the ENTER key
is pressed there may be several prompts and sequences that are run to complete
the modification. The ESC key can always be used to abort the sequence
without changing any stored variables.

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ATI Q46P pH System Part 5 – Configuration

MENU

SECTIONS

MEASURE

CAL CONFIG DIAG

or

Temperature

mV

1

PID % Output

Cal pH

Cal Temp

Loop Current (#1)

Loop Current (#2)

2

Loop Current (#3)

3

Aux rly=

Slope

Offset

Software Version

LIST

ITEMS

Notes:
(1) If Relay A,B,C,D,E,F is set to FAIL mode, relay settings are not
displayed in menu.
(2) The annunciator for Relay C is shown in the MEASURE/
temperature display

1

PID is enabled

2

Optional third 4-20 output installed

3

Optional 3-relay card installed (D,E,F)

4

If Relay A is set to ALARM mode, the settings are divided into

2 groups of HI and LO points.

5

If Comm Mode is set to a selection other than none,

additional Comm menus will show.

6

If Relay C is set to CON

(Factory Default is Fail)

or

Entry Lock

Set Delay

Contrast

Main Units

Zero Filter

Main Display

Select TC

Sensor Type

Auto Buffer

Com Mode

I out 1 Mode

I out 2 Mode

2

I out 3 Mode

Relay A Mode

Relay B Mode

Relay C Mode

3

Relay D Mode

3

Relay E Mode

3

Relay F Mode

Temp Units

5

Com Mode

5

Com Address

CONTROL

or

1

PID 0% #1

1

PID 100% #1

1

PID Setpoint #1

1

PID Prop #1

1

PID Int #1

1

PID Deriv #1

Set 4mA (#1)

Set 20mA (#1)

Set 4mA (#2)

Set 20mA (#2)

2

Set 4mA (#3)

2

Set 20mA (#3)

4

Setpnt A (or A-HI, A-LO)

4

Hyst A (or A-HI, A-LO)

4

Delay A (or A-HI, A-LO)

Phase A

Setpnt B

Hyst B

Delay B

Phase B

6

Setpnt C

6

Hyst C

6

Delay C

6

Phase C

3

Setpnt D

3

Hyst D

3

Delay D

3

Phase D

3

Setpnt E

3

Hyst E

3

Delay E

3

Phase E

3

Setpnt F

3

Hyst F

3

Delay F

3

Phase F

or

Set Hold

Fault List

Sim Out

Glass Diags

1

PID Timer

Fail Out #1

Fail Val #1

Fail Out #2

Fail Val #2

2

Fail Out #3

2

Fail Val #3

Backlight

Start Delay

Failsafe

Set Default

Figure 30 - Software Map

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ATI Q46P pH System Part 5 – Configuration

5.22 Measure Menu [MEASURE]

The default menu for the system is the display-only menu MEASURE. This menu
is a display-only measurement menu, and has no changeable list items. When
left alone, the instrument will automatically return to this menu after
approximately 30 minutes. While in the default menu, the UP arrow allows the
user to scroll through the secondary variables on the lower line of the display. A
brief description of the fields in the basic transmitter version is as follows:

TRANSMITTER MEAS SCREENS:

25.7° Temperature display. Can be displayed in °C or °F,

depending on user selection. A small “m” on the left side of
the screen indicates the transmitter has automatically
jumped to a manual 25°C setting due to a failure with the
temperature signal input.

+132 mV Raw sensor voltage. Useful for diagnosing problems.

100% 20.00 mA PID Status screen (if enabled.) Shows the present controller

output level on left, and actual analyzer current on the right.
The controller can be placed in manual while viewing this
screen by pressing and holding the ENTER key for 5
seconds until a small flashing “m” appears on the screen. At
that point the controller output can be adjusted up or down
using the UP and LEFT arrow keys. To return to automatic
operation, press and hold the ENTER key for 5 seconds and
the “M” will disappear.

#1 4.00 mA Analyzer output current # 1.

#2 12.00 mA Analyzer output current # 2.

#3 20.00 mA Analyzer output current # 3 (if option included.)

Aux relay=D,E,F Auxilliary relay annunciators (if option included.)

Slope = 100% Sensor output response vs. ideal calibration. This value

updates after each calibration. As the sensor ages, the slope
reading will decay indicating sensor aging. Useful for
resolving sensor problems.

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ATI Q46P pH System Part 5 – Configuration

Offset = 0.0 mV Sensor output current at a zero ppm input. This value

updates after a zero-calibration has been performed. Useful
for resolving sensor problems.

Q46P v4.01 Transmitter software version number.

Toff 0.9mn Auto-Clean status screen (if enabled)

Note: A display test (all segments ON) can be actuated by pressing and

holding the ENTER key while viewing the model/version number on
the lower line of the display.

The MEASURE screens are intended to be used as a very quick means of
looking up critical values during operation or troubleshooting.

5.23 Calibration Menu [CAL]

The calibration menu contains items for frequent calibration of user parameters.
There are two items in this list: Cal pH and Cal Temp.

Cal pH The pH calibration function allows the user to adjust the

transmitter offset and span reading to match reference
buffers, or to adjust the sensor offset to match the sample
reading. See Part 6 - Calibration for more details.

Cal Temp The temperature calibration function allows the user to

adjust the offset of the temperature response by a small
factor of ± 5 °C. The temperature input is factory calibrated
to very high accuracy. However, long cable lengths and
junction boxes may degrade the accuracy of the temperature
measurement in some extreme situations. Therefore, this
feature is provided as an adjustment. See Part 6 ­Calibration for more details.

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ATI Q46P pH System Part 5 – Configuration

5.24 Configuration Menu [CONFIG]

The Configuration Menu contains all of the general user settings:

Entry Lock This function allows the user to lock out unauthorized

tampering with instrument settings. All settings may be
viewed while the instrument is locked, but they cannot be
modified. The Entry Lock feature is a toggle-type setting;
that is, entering the correct code will lock the transmitter and
entering the correct code again will unlock it. The code is
preset at a fixed value. Press ENTER to initiate user entry
mode and the first digit will flash. Use arrow keys to modify
value. See the last page of this manual for the Q46P
lock/unlock code. Press ENTER to toggle lock setting
once code is correct. Incorrect codes do not change state of
lock condition.

Set Delay The delay function sets the amount of damping on the

instrument. This function allows the user to apply a first
order time delay function to the pH measurements being
made. Both the display and the output value are affected by
the degree of damping. Functions such as calibration are
not affected by this parameter. The calibration routines
contain their own filtering and stability monitoring functions to
minimize the calibration timing. Press ENTER to initiate user
entry mode, and the value will flash. Use the arrow keys to
modify value; range is 0.1 to 9.9 minutes. Press ENTER to
store the new value.

Contrast This function sets the contrast level for the display. The

custom display is designed with a wide temperature range,
Super-Twist Nematic (STN) fluid.

The STN display provides the highest possible contrast and

widest viewing angle under all conditions. Contrast control
of this type of display is generally not necessary, so contrast
control is provided as a means for possible adjustment due
to aging at extreme ranges. In addition, the display has an
automatic temperature compensation network. Press
ENTER to initiate user entry mode, and the value will flash.
Use arrow keys to modify the value; range is 0 to 8 (0 being
lightest). Press ENTER to update and store the new value.

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ATI Q46P pH System Part 5 – Configuration

Main Display This function allows the user to change the measurement in

the primary display area. The user may select between pH,
sensor temperature, or output current. Using this function,
the user may choose to put temperature in the main display
area and pH on the secondary, lower line of the display.
Press ENTER to initiate user entry mode, and the entire
value will flash. Use the UP arrow key to modify the desired
display value. Press ENTER to store the new value.

Com Mode Sets digital communication mode of analyzer. Optional

digital communication card must be plugged into the power
supply slot for this function to work. Press ENTER to initiate
user entry mode, and the entire value will flash. Use the UP
arrow key to modify the desired value; selections include 1­Modb for Modbus, 2- P-DP for Profibus DP. Press ENTER
to store the new value.

Com Address Sets bus address for digital communication mode of

analyzer. Optional digital communication card must be
plugged into the power supply slot for this function to work.

Press ENTER to initiate user entry mode, and the entire

value will flash. Use the UP arrow key to modify the desired
value. Range is 1-125. Press ENTER to store the new
value.

Select TC This function allows the user to select either a Pt1000 or a

Pt100 RTD temperature element. The Pt1000 element is the
standard element in all high performance Q25 sensors; it is
the recommended temperature sensing element for all
measurements. The Pt100 selection is provided as an
alternative for use with existing combination-style sensors.
Press ENTER to initiate user entry mode, and the entire
value will flash. Use the UP arrow key to modify the desired
value. Press ENTER to store the new value.

Sensor Type This function sets the sensor input type. This selection is

critical for control of the internal diagnostics and
compensation factors. Press ENTER to initiate user entry
mode, and the entire value will flash. Use the UP arrow key
to modify the desired value. Selections are 1 for Q25P glass
sensor, 2 for combination electrode, 3 for Q25P antimony
electrode, and 4 for pure water sensor using special
compensation table. Press ENTER to store the new value.

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ATI Q46P pH System Part 5 – Configuration

Auto Buffer This is a multiple variable function that allows the user to

choose which pH buffer sets that will be utilized in the 2­point calibration mode. The Q46P contains 3 sets of built-in
buffer tables with compensation values ranging from 0 to
95°C. During 2-point calibration, the instrument will
automatically identify which buffer is being used and
compensate for the value based on the built-in tables. This
allows very quick, highly accurate calibrations by the user.
The order in which the buffers are used during calibration is
unimportant, since the system automatically chooses the
correct buffer.

The default setting for this feature is OFF, which disables the
auto-recognition function. Press ENTER to change this
setting. The buffer table set options are: 1: [4/7/10], 2:
[4/7/9.18], and 3: [4.65/6.79/9.23]. See Figure 32 for buffer
tables. Once the buffer set is selected, press ENTER and
the message Accepted! will be displayed on the lower line.

Table 1 Table 2

4.00 pH 7.00 pH 10.00 pH

ºC pH °C pH °C pH

0 4.00 0 7.10

0 10.27

10 3.99 10 7.06 10 10.15

20 4.00 20 7.02 20 10.05

30 4.01 30 6.99 30 9.95

40 4.03 40 6.97 40 9.87

50 4.05 50 6.98 50 9.80

60 4.08 60 6.98 60 9.75

70 4.12 70 6.97 70 9.73

80 4.16 80 6.99 80 9.73

90 4.21 90 7.01 90 9.75

95 4.24 95 7.01 95 9.77

Figure 31 - Automatic pH Buffer Tables

4.00 pH 7.00 pH 9.18 pH

ºC pH °C pH °C pH

0 4.00 0 7.10

0 9.46

10 3.99 10 7.06 10 9.33

20 4.00 20 7.02 20 9.23

30 4.01 30 6.99 30 9.14

40 4.03 40 6.97 40 9.07

50 4.05 50 6.98 50 9.01

60 4.08 60 6.98 60 8.96

70 4.12 70 6.97 70 8.92

80 4.16 80 6.99 80 8.89

90 4.21 90 7.01 90 8.85

95 4.24 95 7.01 95 8.83

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ATI Q46P pH System Part 5 – Configuration

Table 3

Figure 32 - Automatic pH
Buffer Tables (Cont’d)

4.65 pH 6.79 pH 9.23 pH

ºC pH °C pH °C pH

0 4.67 0 6.89

0 9.48

10 4.66 10 6.84 10 9.37

20 4.65 20 6.80 20 9.27

30 4.65 30 6.78 30 9.18

40 4.66 40 6.76 40 9.09

50 4.68 50 6.76 50 9.00

60 4.70 60 6.76 60 8.92

70 4.72 70 6.76 70 8.88

80 4.75 80 6.78 80 8.85

90 4.79 90 6.80 90 8.82

95 4.79 95 6.80 95 8.82

Iout#1 Mode This function sets analog output #1 to either track pH

(default) or enables the PID controller to operate on the pH
input. Press ENTER to initiate user entry mode, and the
entire value will flash. Use the UP arrow key to modify the
desired value;selections include 1-pH, 2-PID for PID output.
Press ENTER to store the new value.

Iout#2 Mode This function sets analog output #2 for temperature (default),

or pH. Press ENTER to initiate user entry mode, and the
entire value will flash. Use the UP arrow key to modify the
desired value; selections include 1-C/F for temperature, 2­pH for pH. Press ENTER to store the new value.

*Iout#3 Mode OPTIONAL. This function sets analog output #3 for

temperature or pH. Press ENTER to initiate user entry
mode, and the entire value will flash. Use the UP arrow key
to modify the desired value; selections include 1-C/F for
temperature, 2-pH for pH. Press ENTER to store the new
value.

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Rly A Mode Relay A can be used in three different ways: as a setpoint

control, as a fail alarm, or as a HI-LO alarm band. The three
settings for Rly A Mode are CON, FAIL and AL.

The CON setting enables normal control operation for Relay

A, with settings for setpoint, hysteresis, delay and phasing
appearing in the CONFIG menu automatically. See Figure
33 for further details.

The FAIL setting enables the fail alarm mode for Relay A.

Relay A will then trip on any condition that causes the FAIL
icon to be displayed on the LCD. Using this mode allows the
User to send alarm indications to other remote devices.

The AL setting allows two setpoints to be selected for the

same relay, producing a HI-LO alarm band. In this mode,
Relay A will trip inside or outside of the band, depending
upon the Phase selected. See Figure 34 for further details.

*Relay B Mode Relay B can be used in a number of ways: as a setpoint

control, as an alarm, or as an auto-cleaner. The four
settings for Relay B Mode are CON, FAIL, CLn1, and CLn2.

The CON setting enables normal setpoint operation for

Relay B. Relay B then operates identically to Relay A, with
settings for setpoint, hysteresis, delay and phasing
appearing in the CONFIG menu automatically. See Figure
33 for details.

The FAIL setting enables the fail alarm mode for Relay B.
Relay B will then trip on any condition that causes the FAIL
icon to be displayed on the LCD. Using this mode allows the
User to send alarm indications to other remote devices.
Figure 34 for details.

Relay B in Auto-Clean Monitors is used to activate the air­wash cleaning system that keeps the sensor operating
properly. This relay should normally be set to CLn1 1 Mode
for normal cleaning. Do not change the factory setting for
this relay without first consulting ATI or your ATI
representative

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ATI Q46P pH System Part 5 – Configuration

Relay C Mode Relay B and C can be used in two ways: as a setpoint

control, or as an alarm. The two settings for Relay B Mode
are CON and FAIL.

The CON setting enables normal setpoint operation for

Relay B/C. Relay B/C then operates identically to Relay A,
with settings for setpoint, hysteresis, delay and phasing
appearing in the CONFIG menu automatically. See Figure
33 for details.

The FAIL setting enables the fail alarm mode for Relay B/C.

Relay B/C will then trip on any condition that causes the
FAIL icon to be displayed on the LCD. Note that the Relay C
indicator shows up only on the lower screen of the display
next to the temperature reading. This is because the default
setting for relay C is the FAIL setting. Using this mode
allows the User to send alarm indications to other remote
devices. See Figure 34 for details.

*Relay D Mode
*Relay E Mode
*Relay F Mode OPTIONAL. RelaysD,E,and F can be used in two ways: as a

setpoint control, or as an alarm. The two settings for Relay
B Mode are CON and FAIL.

The CON setting enables normal setpoint operation for

Relay B. Relay B then operates identically to Relay A, with
settings for setpoint, hysteresis, delay and phasing
appearing in the CONFIG menu automatically. See Figure
33 for details.

Temp Units This function sets the display units for temperature

measurement. Press ENTER to initiate user entry mode,
and the entire value will flash.

Use the UP arrow key to modify the desired display value.

The choices are °F and °C. Press ENTER to store the new
value.

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ATI Q46P pH System Part 5 – Configuration

5.25 Control Menu [CONTROL]

The Control Menu contains all of the output control user settings:

Set PID 0%
Set PID 100%

[Iout1=PID] If the PID is enabled, this function sets the minimum and

maximum controller end points. Unlike the standard 4-20
mA output, the controller does not “scale” output values
across the endpoints. Rather, the endpoints determine
where the controller would normally force minimum or
maximum output in an attempt to recover the setpoint (even
though the controller can achieve 0% or 100% anywhere
within the range.)

If the 0% point is lower than the 100% point, then the

controller action will be “reverse” acting. That is, the output
of the controller will increase if the measured value is less
than the setpoint, and the output will decrease if the
measured value is larger than the setpoint. Flipping the
stored values in these points will reverse the action of the
controller to “direct” mode.

The entry value is limited to a value within the range

specified in “Set Range”, and the 0% and the 100% point
must be separated by at least 1% of this range Use the
LEFT arrow key to select the first digit to be modified. Then
use the UP and LEFT arrow keys to select the desired
numerical value. Press ENTER to store the new value.

PID Setpnt

[Iout1=PID] The measured value which the controller is attempting to

maintain by adjusting output value. It is the nature of the
PID controller that it never actually gets to the exact value
and stops. The controller is continually making smaller and
smaller adjustments as the measured value gets near the
setpoint.

PID Prop

[Iout1=PID] Proportional gain factor. The proportional gain value is a

multiplier on the controller error (difference between
measured value and setpoint value.) Increasing this value
will make the controller more responsive.

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ATI Q46P pH System Part 5 – Configuration

PID Int

[Iout1=PID] Integral is the number of “repeats-per-minute” of the action

of the controller. It is the number of times per minute that
the controller acts on the input error. At a setting of 2.0 rpm,
there are two repeats every minute. If the integral is set to
zero, a fixed offset value is added to the controller (manual
reset.) Increasing this value will make the controller more
responsive.

PID Deriv

[Iout1=PID] Derivative is a second order implementation of Integral, used

to suppress “second-order” effects from process variables.
These variables may include items like pumps or mixers that
may have minor impacts on the measured value. The
derivative factor is rarely used in water treatment process,
and therefore, it is best in most cases to leave it at the
default value. Increasing this value will make the controller
more responsive.

Set 4 mA

Set 20 mA
[Iout1=pH] These functions set the main 4 and 20 mA current loop #1

output points for the analyzer when output 1 is in normal,
non-PID, mode of operation.

The value stored for the 4 mA point may be higher or lower

than the value stored for the 20 mA point. The entry values
are limited to values within the range specified in “Set
Range”, and the 4 mA and the 20 mA point must be
separated by at least 1% of this range Use the LEFT arrow
key to select the first digit to be modified. Then use the UP
and LEFT arrow keys to select the desired numerical value.
Press ENTER to store the new value.

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ATI Q46P pH System Part 5 – Configuration

*Set 4 mA #2
*Set 20 mA #2
[temp/pH] These functions set the second 4 mA and 20 mA current

loop output points for the transmitter. The output may be set
to track temperature (default) or pH. The values stored for
the 4 mA point may be higher or lower than the value stored
for the 20 mA point.

The entry value is limited to a value between 0 and 55 °C if it

is set for temperature and must be within 0-14 pH if set to
track pH. The 4 mA and the 20 mA point must be at least 20
units away from each other. Press ENTER to initiate user
entry mode, and the value will flash. Use arrow keys to
modify value. Press ENTER to store the new value.

*Set 4 mA #3
*Set 20 mA #3
[temp/pH] OPTIONAL These functions set the optional third 4 mA and

20 mA current loop output points for the transmitter. The
output may be set to track temperature (default) or pH. The
values stored for the 4 mA point may be higher or lower than
the value stored for the 20 mA point.

The entry value is limited to a value between 0 and 55 °C if it

is set for temperature and must be within 0-14 pH if set to
track pH. The 4 mA and the 20 mA point must be at least 20
units away from each other. Press ENTER to initiate user
entry mode, and the value will flash. Use arrow keys to
modify value. Press ENTER to store the new value.

*A Setpoint This function establishes the pH trip point for relay A. The

entry value is limited to a value within the range specified in
“Set Range”. Use the LEFT arrow key to select the first digit
to be modified. Then use the UP and LEFT arrow keys to
select the desired numerical value. Press ENTER to store
the new value.

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ATI Q46P pH System Part 5 – Configuration

*A Hysteresis This function establishes the hysteresis, or “deadband”, for

Relay A. Hysteresis is most often used to control relay
chattering; however, it may also be used in control schemes
to separate the ON/OFF trip points of the relay. Press
ENTER to initiate user entry mode, and the value will flash.
Use the arrow keys to modify value. Press ENTER to store
the new value.

*A Delay This function places an additional amount of time delay on

the trip point for relay A. This delay is in addition to the main
delay setting for the controller. The entry value is limited to a
value between 0 and 999 seconds. Press ENTER to initiate
user entry mode, and the value will flash. Use arrow keys to
modify value; range is 0 to 999 seconds. Press ENTER to
store the new value.

*A Phasing This function establishes the direction of the relay trip.

When phase is HI, the relay operates in a direct mode.
Therefore, the relay energizes and the LCD indicator
illuminates when the pH value exceeds the setpoint. When
the phase is LO, the relay energizes and the LCD indicator
illuminates when the pH level drops below the setpoint. The
failsafe setting does have an impact on this logic. The
description here assumes the failsafe setting is OFF. Press
ENTER to initiate user entry mode, and the entire value will
flash. Use the UP arrow key to modify the desired value;
selections include HI for direct operation or LO for reverse
operation. Press ENTER to store the new value.

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ATI Q46P pH System Part 5 – Configuration

closes.

8.95 pH, relay

9.05 pH, relay

9.00 pH, relay

9.00 pH

ON

HYSTERESIS

“DEADBAND”

9.05 pH

HYSTERESIS

“DEADBAND”

See Figure 33 below for a visual description of a typical control relay application.

When value rises to ≥ 9.00 pH, relay

When value falls to ≤
opens.

Setpoint: 9.00 pH

PHASE: HI

X

OR

8.95 pH
OFF

Hyst: 0.05
Delay: 000
Failsafe: OFF

When value rises to ≥
opens.

When value falls to ≤
closes.

PHASE: LO

9.00 pH

X

ON

OR

Figure 33 - Control Relay Example, Hysteresis and Opposite Phase

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ATI Q46P pH System Part 5 – Configuration

9.00 pH, relay

8.95

7.00 pH, relay

7.05

7.00 pH, relay

6.95

9.00 pH, relay

*Setpnt A

-

HI

ON

ON

}

}

9.05 pH

9.00 pH

7.00 pH

6.95 pH

PHASE: LO

OFF

HYST - HI

HYST - LO

OFF

X

X

If Relay A Mode is set to Alarm Mode, AL, then the following

*Hyst A-HI
*Delay A-HI
*Setpnt A-LO
*Hyst A-LO
*Delay A-LO

Figure 34 is a visual description of a typical alarm relay

When value rises to ≥
closes, until value falls back to <

settings will appear in the Config Menu list automatically. In
this mode, two setpoints can be selected on the same relay,
to create an alarm band. Phase HI selection causes the
relay to energize outside of the band, and Phase LO causes
the relay to energize inside of the band. This feature
enables one relay to be used as a control relay while the
other is used as a HI-LO Alarm relay at the same time.
Setpoint A-LO must be set lower than Setpoint A-HI. When
AL mode is first selected, Setpoint A-LO is defaulted to 0.

application.

When value falls to <
closes, until rises back to > 9.05 pH.

PHASE: HI

9.00 pH

8.95 pH

7.05 pH

7.00 pH

X

OFF

X

HYST - HI

}

HYST - LO

}

Setpoint A-HI: 9.00 pH Setpoint A-LO: 7.00 pH
Hyst A-HI: 0.050 Hyst A-LO: 0.05 pH
Delay A-HI: 000 Delay A-LO: 000

When value falls to <
closes, until value rises back to >
pH.

Figure 34 - Alarm Relay Example

ON

When value rises to ≥
closes, until value falls back to <
pH.

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*B Setpoint

If Relay B Mode is set to CON or FAIL, then Relay B will

*B Hysteresis
*B Delay
*B Phasing

*Timer B ON
*Timer B OFF
*Timer B HOLD If Relay B Mode is set to CLn1 (see Relay B Mode), then

Relay B will toggle ON and OFF based on the time settings

Note: The sensor wash timer is not based on a “real-

function identically to Relay A CON or FAIL modes
described earlier. Relay B settings appear in the CONFIG
menu list automatically.

these timer settings appear in the CNTRL menu list
automatically.

entered by the user. The timer ON setting controls the
amount of time that Relay B is engaged (N.O. contact
closed), and the timer OFF setting controls the amount of
time that Relay B is released (N.O. contact open.)

The timer HOLD setting allows an output hold time to be
entered into the ON/OFF cleaning cycle. This hold time
allows the outputs to stabilize back to normal readings
before the outputs are released from their “hold” state.
Using this feature properly avoids disturbing any instruments
connected to the outputs during the cleaning cycle – where
D.O. readings can fluctuate.

time” clock circuit. Therefore, the time accuracy is only
within about 10 minutes per day.

Note: A timer wash cycle can be manually started by
pressing and holding the ENTER key for a few seconds
while viewing the timer status screen in the MEAS
menu. The timer must be in the “OFF” state” to allow a
manual start (“T” is not flashing in the display.) After
this forced cycle, the system will return to normal.

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ATI Q46P pH System Part 5 – Configuration

C Setpoint

D,E,F Setpoint

If Relay C Mode is set to CON (see Relay C Mode), then

C Hysteresis
C Delay
C Phasing

D,E,F Hyster
D,E,F Delay
D,E,F Phasing

5.26 Diagnostics Menu [DIAG]

The diagnostics menu contains all of the user settings that are specific to the
system diagnostic functions, as well as functions that aid in troubleshooting
application problems.

Set Hold The Set Hold function locks the current loop output values

CAUTION: There is no time-out on the hold feature.

The Set Hold function can also hold at an output value

Relay C will function identically to Relay A. Relay C settings
appear in the CONFIG menu list automatically.

If Relay D, E, or F Mode is set to CON (see Relay D,E,F
Modes), then the Relay will function identically to Relay A.
Relay settings appear in the CONFIG menu automatically.

on the present process value. This function can be used
prior to calibration, or when removing the sensor from the
process, to hold the output in a known state. Once HOLD is
released, the outputs return to their normal state of following
the process input. The transfer out of HOLD is bumpless on
the both analog outputs - that is, the transfer occurs in a
smooth manner rather than as an abrupt change. An icon
on the display indicates the HOLD state, and the HOLD state
is retained even if power is cycled. Press ENTER to initiate
user entry mode, and entire value will flash. Use the UP
arrow key to modify the desired value, selections are ON for
engaging the HOLD function, and OFF to disengage the
function. Press ENTER to store the new value.

Once placed into hold mode, return to normal operation
must be done manually.

specified by the user. To customize the hold value, first turn
the HOLD function on. Press the ESC key to go to the DIAG
Menu and scroll to Sim Output using the UP arrow key.
Press ENTER. Follow the instructions under Sim Output
(see following page).

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Fault List The Fault List screen is a read-only screen that allows the

user to display the cause of the highest priority failure. The
screen indicates the number of faults present in the system
and a message detailing the highest priority fault present.
Note that some faults can result in multiple displayed failures
due to the high number of internal tests occurring. As faults
are corrected, they are immediately cleared.

Faults are not stored and are immediately removed if power

is cycled. If the problem causing the faults still exists,
however, faults will be displayed again after power is re­applied and a period of time elapses during which the
diagnostic system re-detects them. The exception to this
rule is the calibration failure. When a calibration fails, no
corrupt data is stored. Therefore, the system continues to
function normally on the data that was present before the
calibration was attempted.

After 30 minutes or if power to the transmitter is cycled, the

failure for calibration will be cleared until calibration is
attempted again. If the problem still exists, the calibration
failure will re-occur. Press ENTER to initiate view of the
highest priority failure. The display will automatically return
to normal after a few seconds.

PID Timer This function sets a timer to monitor the amount of time the

PID controller remains at 0% or 100%. This function only
appears if the PID controller is enabled. If the timer is set to
0000, the feature is effectively disabled. If the timer value is
set to any number other zero, a FAIL condition will occur if
the PID controller remains at 0% or 100% for the timer value.
If one of the relays is set to FAIL mode, this failure condition
can be signaled by a changing relay contact.

Press ENTER to initiate user entry mode, and the entire

value will flash. Use the UP arrow key to modify desired
value; range of value is 0-9999 seconds. Press ENTER to
store the new value.

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Sim Out The Sim Out function allows the user to simulate the pH

level of the instrument in the user selected display range.
The user enters a pH value directly onto the screen, and the
output responds as if it were actually receiving the signal
from the sensor. This allows the user to check the function
of attached monitoring equipment during set-up or
troubleshooting. Escaping this screen returns the unit to
normal operation. Press ENTER to initiate the user entry
mode, and the right-most digit of the value will flash. Use
arrow keys to modify desired value.

The starting display value will be the last read value of the

input. The output will be under control of the SIM screen
until the ESC key is pressed.

NOTE: If the HOLD function is engaged before the Sim Output

function is engaged, the simulated output will remain
the same even when the ESC key is pressed. Disengage
the HOLD function to return to normal output.

Glass Diags This function allows the user to shut off the glass

breakage/leak diagnostics. It does not affect the state of the
remaining system diagnostics. This capability is provided to
eliminate nuisance trips in electrically noisy applications,
such as some plating operations. If ON, Relay B is
automatically configured as a fail alarm relay. The relay trips
on any fail condition. Therefore, the normal settings for
control Relay B will disappear from the CONFIG menu since
they cannot be used. Note that the probe timer function can
also alter the operation of Relay B. If the electrode
diagnostic function is enabled, that function takes
precedence over the probe timer. Note also that this

function cannot be used with conventional pH sensors.
It works only when using the Q25 differential pH
sensors.

PID Timer This function sets a timer to monitor the amount of time the

PID controller remains at 0% or 100%. This function only
appears if the PID controller is enabled. If the timer is set to
0000, the feature is effectively disabled. If the timer value is
set to any number other zero, a FAIL condition will occur if
the PID controller remains at 0% or 100% for the timer value.
If one of the relays are set to FAIL mode, this failure
condition can be signaled by a changing relay contact.

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Press ENTER to initiate user entry mode, and the entire
value will flash. Use the UP arrow key to modify desired
value; range of value is 0-9999 seconds. Press ENTER to
store the new value

Fail Out #1 This function enables the user to define a specified value

that the main current output will go to under fault conditions.
When the Relay Option Board is installed, the display will
read Fail Out #1. When enabled to ON, the output may be
forced to the current value set in Fail Val (next item.) With
the Fail Out setting of ON, and a Fail Val setting of 6.5 mA,
any alarm condition will cause the current loop output to drop
outside the normal operating range to exactly 6.5 mA,
indicating a system failure that requires attention.

Press ENTER to initiate user entry mode, and the entire
value will flash. Use the UP arrow key to modify desired
value; selections are ON, OFF. Press ENTER to store the
new value.

Fail Val #1 Sets the output failure value for Iout#1. When Fail Out

above is set to ON, this function sets value of the current
loop under a FAIL condition. When the Relay Option Board
is installed, the display will read Fail Out #1. The output
may be forced to any current value between 4-20 mA.

Press ENTER to initiate user entry mode, and the entire

value will flash. Use the UP arrow key to modify desired
value; selections are between 4mA, and 20mA. Press
ENTER to store the new value.

Fail Out #2 This function sets the fail-mode of current loop output #2

under a FAIL condition. The settings and operation are
identical to Fail Out for output #1.

Fail Val #2 This function sets the value of current loop output #2 under a

FAIL condition. The settings and operation are identical to
Fail Out for output #1.

*Fail Out #3 OPTIONAL. This function sets the fail-mode of current loop
output #3 under a FAIL condition. The settings and

operation are identical to Fail Out for output #1.

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*Fail Val #3 OPTIONAL. This function sets the value of current loop

output #3 under a FAIL condition. The settings and
operation are identical to Fail Out for output #1.

*Failsafe This function allows the user to set the optional system

relays to a failsafe condition. In a failsafe condition, the relay
logic is reversed so that the relay is electrically energized in
a normal operating state. By doing this, the relay will not
only change state when, for example, a pH limit is exceeded,
but also when power is lost to the controller.

When failsafe is selected to be ON, the normally-open

contacts of the relay will be closed during normal operation.
To make this configuration less confusing, the LCD icon
logic is reversed with this setting, and the icon is OFF under
this normal condition. Therefore, when the trip condition
occurs, the closed N.O. contacts will be opened (relay de­energized), and the LCD icon will illuminate. In addition, a
power fail would also cause the same contacts to open.

Start Delay This function is designed to minimize control or alarm issues

arising from temporary power loss. When power goes down,
the monitor records the analog output values and the status
of relays and PID functions. When power is restored, the
analog values and relays will be held at the pre-power loss
values for a defined period of time. This “start delay” may be
programmed for periods from 0-9.9 minutes. This function is
set to 0.0 minutes by default and must be activated by the
user if desired by setting a positive time value

Set Default The Set Default function allows the user to return the

instrument back to factory default data for all user settings or
for just the calibration default. It is intended to be used as a
last resort troubleshooting procedure. All user settings or
the calibration settings are returned to the original factory
values. Hidden factory calibration data remains unchanged.
Press ENTER to initiate user entry mode and select either

All or CAL with the UP arrow key.

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Part 6 – Calibration

6.1 Overview and Methods

Since the sensor slope (mV/pH output) will degrade over time, the instrument
must be calibrated periodically to maintain a high degree of measurement
accuracy. Frequency of calibration must be determined by the application. High
temperature applications or applications involving extreme pH operating
conditions may require more frequent calibration than those that operate at more
neutral pH levels and ambient level temperatures. It is important for the user to
establish a periodic cleaning and calibration schedule for sensor maintenance to
maintain high system accuracy.

Before calibrating the instrument for the very first time after initial installation, it is
important to select the proper operating parameters in the configuration menus
for items like Sensor Type and Auto Buffers.

If Auto Buffers is not enabled, select buffers with values that are close to the
normal operating pH of the process. For example, if the process is operating
normally at 8 pH, buffer values of 9.18 pH and 7.00 pH are preferred over buffers
of 4.00 pH and 7.00 pH. If possible, select one of the buffers to be near 7.00 pH.

NOTE: Buffers must be at least 2 pH units apart to ensure accurate

calibration.

The system provides two methods of pH calibration: 2-point and 1-point. These
two methods are significantly different. See Sections 6.13 and 6.14 for a brief
description of their uses.

6.11 Sensor Slope

The sensor slope is a number (expressed as a percentage) which represents the
current condition of the sensor electrodes. The slope display is updated after
every calibration. When new, the sensor slope should be between 95% and
105%. A 100% slope represents an ideal sensor output of 59.16 mV/pH, from
standardization (7.00 pH at 25°C). Over time, the glass electrodes in the sensor
will age with use. This results in a reduction of the slope (mV/pH output) of the
sensor. Thus a sensor slope of 85% is equivalent to an output of 50.29 mV/pH
from standardization. The instrument will not allow calibrations on a sensor with
a slope less than 80%. The slope information from the most recent calibration
can be viewed at any time in the Measure Menu (see Section 5.22).

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ATI Q46P pH System Part 6 – Calibration

6.12 Sensor Offset

Sensor offset is a number that indicates sensor output (expressed in mV) in 7.00
pH buffer at 25 ºC. Ideally, the sensor will output 0 mV under these conditions.
A sensor offset reading of +10 mV indicates that the sensor will output +10 mV
when placed into a perfect 7.00 pH buffer at 25 ºC. In other words, sensor offset
shifts the entire mV/pH curve up or down. Sensor offset is generally produced by
a small voltage drop at the sensor reference junction. Large offsets are most
typically the result of foulants on the reference junction, an aged reference
junction, or a weak reference fill solution. The instrument does not allow
calibrations on a sensor with an offset greater than +90 mV or less than –90 mV.
Sensor offset information from the most recent calibration can be viewed at any
time in the Measure Menu (See Section 5.22).

6.13 2-Point Calibration Explained

The 2-point calibration method involves the movement of the sensor through two
known pH buffer values. Therefore, the sensor must be removed from the
application to utilize this method. Two-point calibration adjusts both the slope
and the offset of the sensor. It is the recommended method of calibration for
highest accuracy. In addition, this calibration method utilizes an automatic buffer
recognition and compensation method.

IMPORTANT: the 2-point calibration mode MUST be performed when a new
sensor is first put into operation so that accurate calibration data is available for
possible later 1-point calibrations.

6.14 1-Point Calibration Explained

The 1-point calibration method is generally known as the "grab sample"
calibration method. In the 1-point calibration method, the sensor may be
removed from the application and placed into one buffer. It may also be left in
the measurement process and calibrated by reference. 1-point calibration
adjusts only the sensor offset. Since the sensor slope degrades much slower
than the sensor offset, this method may be used as a frequent calibration method
between more involved 2-point calibrations. For example, a user may choose to
perform on-line 1-point calibrations weekly and 2-point calibrations monthly.

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6.2 Performing a 2-Point Calibration

The 2-point calibration method utilizes an automatic buffer recognition and
compensation system. For this system to operate properly, the user must first
configure the proper buffers in the Set Buffers screen (see Section 5.24). If the
buffers are not present in this menu, the user can override the automatic values
and enter arbitrary values. However, the highest accuracy is provided when the
user selects and uses buffers from this pre-defined table list. With the pre­defined buffers, the temperature variations in the buffer are automatically
compensated for during the calibration process. If the buffer data is manually
entered, the calibration buffer sample must be very temperature stable to achieve
the same degree of accuracy.

Procedure

1. Remove sensor from application. Rinse and clean if necessary.

2. Allow sensor to temperature equilibrate with the buffer as best as possible. With

the sensor coming from an application solution that differs greatly in temperature
from the buffer, the user may have to wait as much as 20 minutes for this to
occur.

3. Scroll to the CAL menu section using the MENU key and press ENTER or the UP
arrow key. Cal pH will then be displayed.

4. Press the ENTER key. The screen will display a flashing 1 for 1-point or a 2 for
2-point calibration. Using the UP arrow key, set for a 2-point calibration and
press ENTER.

5. The display will prompt the user to place the sensor in the first buffer and press
ENTER. If the sensor has been placed into this buffer already, once the
temperature has stabilized, press ENTER to continue.

6. The present pH value will be displayed and the secondary line of the display will
flash Wait for approximately 10-15 seconds. At this time the system is
attempting to recognize the first buffer value from the two values entered into the
Set Buffers selection.

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7. The screen will display the buffer value to be used for calibration. If the user
chooses to change this value, the arrow keys can be used to modify the value.
Any value between 0.00 and 14.00 pH can be entered. After adjusting this value,
or to accept the automatic value, press ENTER.

8. The system now begins acquiring data for the calibration value of this buffer
point. As data is gathered, the units for pH and temperature may begin to flash.
Flashing units indicates that this parameter is unstable. The data point
acquisition will stop only when the data remains stable for a pre-determined
time. This can be overridden by pressing ENTER. If the data remains unstable
for 10 minutes, calibration will fail and Cal Unstable will be displayed.

9. Once the first calibration value has been established, the screen will prompt the
user to move the sensor to the second buffer. At this point, rinse sensor with
water and move the sensor into the second buffer solution. Allow temperature to
stabilize, and then press ENTER.

10. The present pH value will be displayed and the secondary line of the display will
flash Wait for approximately 10-15 seconds. At this time the system is
attempting to recognize the second buffer value from the two values entered into
the Set Buffers selection.

11. The screen will display the buffer value to be used for calibration. If the user
chooses to change this value, the arrow keys can be used to modify the value.
Any value between 0.00 and 14.00 pH can be entered. The second buffer must
be at least 2 pH units away from the first. After adjusting this value, or to accept
the automatic value, press ENTER.

12. The system now begins acquiring data for the calibration value of this buffer
point. As data is gathered, the units for pH and/or temperature may again flash,
indicating unstable parameters.

13. If accepted, the screen will display the message PASS with the new slope and
offset readings, then it will return to the main measurement display. If the
calibration fails, a message indicating the cause of the failure will be displayed
and the FAIL icon will be turned on.

The sensor offset value in % from the last span calibration is displayed on the
lower line of the Default Menus for information purposes.

6.3 Performing a 1-Point Calibration

The 1-point, or sample calibration method does not utilize the automatic buffer
recognition and compensation system. This calibration method is intended to be
primarily used as an on-line calibration method, in which the actual calibration
point will not be a buffer value. However, the sensor can be removed and
calibrated in a separate buffer. During calibration, the system will display the
current pH reading and the user can manually enter a reference value from a lab
grab-sample or a comparative reference instrument.

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Procedure

1. Determine whether the calibration will be done on-line or with the sensor
removed and placed into a buffer. If the sensor is removed from the
application, rinse and clean if necessary.

2. If the sensor has been removed and placed into a buffer, allow sensor to
temperature equilibrate with the buffer as much as possible. With the sensor
coming from an application which differs greatly in temperature difference, the
user may have to wait as much as 20 minutes. If the sensor is on-line, the
user may want to set the output HOLD feature prior to calibration to lock out
any output fluctuations.

3. Scroll to the CAL menu section using the MENU key and press ENTER or the
UP arrow key. Cal pH will then be displayed.

4. Press the ENTER key. The screen will display a flashing 1 for 1-point or a 2
for 2-point calibration. Using the UP arrow key, set for a 1-point calibration
and press ENTER.

5. The system now begins acquiring data for the calibration value. As data is
gathered, the units for pH and temperature may flash. Flashing units indicate
that this parameter is unstable. The calibration data point acquisition will stop
only when the data remains stable for a pre-determined amount of time. This
can be overridden by pressing ENTER. If the data remains unstable for 10
minutes, the calibration will fail and the message Cal Unstable will be
displayed.

6. The screen will display the last measured pH value [or the auto buffer value, if
activated] and a message will be displayed prompting the user for the lab
value. The user must then modify the screen value with the arrow keys and
press ENTER. The system then performs the proper checks.

7. If accepted, the screen will display the message PASS with the new offset
reading, and then it will return to the main measurement display. If the
calibration fails, a message indicating the cause of the failure will be
displayed and the FAIL icon will be turned on.

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6.4 Temperature Calibration

The temperature input is factory calibrated for the highest accuracy. Temperature
calibration is not recommended unless the installation involves long cable lengths. For
example, at 50 feet, readings may be off ± 0.2°C. The temperature calibration
sequence is essentially a 1-point offset calibration that allows adjustments of
approximately ± 5°C.

The sensor temperature may be calibrated on line, or the sensor can be removed from
the process and placed into a known solution temperature reference. In any case, it is
critical that the sensor be allowed to reach temperature equilibrium with the solution in
order to provide the highest accuracy. When moving the sensor between widely
different temperature conditions, it may be necessary to allow the sensor to stabilize as
much as one hour before the calibration sequence is initiated. If the sensor is on-line,
the user may want to set the output HOLD feature prior to calibration to lock out any
output fluctuations.

Procedure

1. Scroll to the CAL menu section using the MENU key and press ENTER or the
UP arrow key.

2. Press the UP arrow key until Cal Temp is displayed.

3. Press the ENTER key. The message Place sensor in solution then press
ENTER will be displayed. Move the sensor into the calibration reference (if it
hasn’t been moved already) and wait for temperature equilibrium to be
achieved. Press ENTER to begin the calibration sequence.

4. The message Adjust temp value then press ENTER will be displayed, and
the right-most digit will begin to flash, indicating that the value can be
modified. Using the UP and LEFT arrow keys, modify the value to the known
ref solution temperature. Adjustments up to ± 5°C from the factory calibrated
temperature are allowed. Press ENTER.

5. The calibration data gathering process will begin. The message Wait will
flash as data is accumulated and analyzed. The °C or °F symbol may flash
periodically if the reading is too unstable.

6. Once completed, the display will indicate PASS or FAIL. If the unit fails, the
temperature adjustment may be out of range, the sensor may not have
achieved complete temperature equilibrium, or there may be a problem with
the temperature element. In the event of calibration failure, it is
recommended to attempt the calibration again immediately.

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Part 7 – PID Controller Details

7.1 PID Description

PID control, like many other control schemes, are used in chemical control to
improve the efficiency of chemical addition or control. By properly tuning the
control loop that controls chemical addition, only the amount of chemical that is
truly required is added to the system, saving money. The savings can be
substantial when compared to a system which may be simply adding chemical at
a constant rate to maintain some minimal addition under even the worst case
conditions. The PID output controller is highly advantageous over simple control
schemes that just utilize direct (proportional only) 4-20 mA output connections for
control, since the PID controller can automatically adjust the “rate” of recovery
based on the error between the setpoint and the measured value – which can be
a substantial efficiency improvement..

The PID controller is basically designed to provide a “servo” action on the 4-20
mA output to control a process. If the user requires that a measured process
stay as close as possible to a specific setpoint value, the controller output will
change from 0% to 100% in an effort to keep the process at the setpoint. To
affect this control, the controller must be used with properly selected control
elements (valves, proper chemicals, etc.) that enable the controller to add or
subtract chemical rapidly enough. This is not only specific to pumps and valves,
but also to line sizes, delays in the system, etc.

This section is included to give a brief description of tuning details for the PID
controller, and is not intended to be an exhaustive analysis of the complexities of
PID loop tuning. Numerous sources are available for specialized methods of
tuning that are appropriate for a specific application.

7.2 PID Algorithm

As most users of PID controllers realize, the terminology for the actual algorithm
terms and even the algorithms themselves can vary between different
manufacturers. This is important to recognize as early as possible, since just
plugging in similar values from one controller into another can result in
dramatically different results. There are various basic forms of PID algorithms
that are commonly seen, and the implementation here is the most common
version; The ISA algorithm (commonly referred to as the “ideal” algorithm.)

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tde

dt

)(

ù
ú

û

é
ê

ë

1

tePoutput

)(

ò

I

++=

Dtdte

)()(

Where:

output = controller output
P = proportional gain
I = integral gain
D = derivative gain
t = time
e(t) = controller error (e=measured variable – setpoint)

Figure 35 - Q45H ISA (ideal) PID Equation

The most notable feature of the algorithm is the fact the proportional gain term
affects all components directly (unlike some other algorithms - like the “series”
form.) If a pre-existing controller utilizes the same form of the algorithm shown
above, it is likely similar settings can for made if the units on the settings are
exactly the same. Be careful of this, as many times the units are the reciprocals
of each other (i.e. reps-per-min, sec-per-rep.)

PID stands for “proportional, integral, derivative.” These terms describe the three
elements of the complete controller action, and each contributes a specific
reaction in the control process. The PID controller is designed to be primarily
used in a “closed-loop” control scheme, where the output of the controller directly
affects the input through some control device, such as a pump, valve, etc.

Although the three components of the PID are described in the setting area
(section 4.25), here are more general descriptions of what each of the PID
elements contribute to the overall action of the controller.

P Proportional gain. With no “I” or “D” contribution, the controller output is

simply a factor of the proportional gain multiplied by the input error
(difference between the measured input and the controller setpoint.)
Because a typical chemical control loop cannot react instantaneously to a
correction signal, proportional gain is typically not efficient by itself – it
must be combined with some integral action to be useful. Set the P term to
a number between 2-4 to start. Higher numbers will cause the controller
action to be quicker.

I Integral gain. Integral gain is what allows the controller to eventually drive

the input error to zero – providing accuracy to the control loop. It must be
used to affect the accuracy in the servo action of the controller. Like
proportional gain, increasing integral gain results in the control action
happening quicker. Set the I term to a number between 3-5 to start (1-2
more than P). Like proportional gain, increasing the integral term will
cause the controller action to be quicker.

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D Derivative gain. The addition of derivative control can be problematic in

many applications, because it greatly contributes to oscillatory behavior.
In inherently slow chemical control process’, differential control is
generally added in very small amounts to suppress erratic actions in the
process that are non-continuous, such as pumps and valves clicking on
and off. However, as a starting point for chemical process control, its best
to leave the “D” term set to 0.

Based on these descriptions, the focus on tuning for chemical applications really
only involves adjustment of “P” and “I” in most cases. However, increasing both
increases the response of the controller. The difference is in the time of recovery.
Although combinations of high “P’s” and low “I” will appear to operate the same
as combinations of low “P’s” and high “I’s”, there will be a difference in rate of
recovery and stability. Because of the way the algorithm is structured, large “P’s”
can have a larger impact to instability, because the proportional gain term
impacts all the other terms directly. Therefore, keep proportional gain lower to
start and increase integral gain to achieve the effect required.

Many of the classical tuning techniques have the user start with all values at 0,
and then increase the P term until oscillations occur. The P value is then
reduced to ½ of the oscillatory value, and the I term is increased to give the
desired response. This can be done with the Q45H controller, with the exception
that the I term should start no lower than 1.0.

If it appears that even large amounts of integral gain (>20) don’t appreciably
increase the desired response, drop I back to about 1.0, and increase P by 1.00,
and start increasing I again. In most chemical control schemes, I will be
approximately 3 times the value of P.

7.3 Classical PID Tuning

Unlike many high speed position applications where PID loops are commonly
used, the chemical feed application employed by this instrument does not require
intense mathematical exercise to determine tuning parameters for the PID. In
fact, the risk of instability is far greater with overly tuned PID control schemes. In
addition, many of the classical mathematical exercises can be damaging or
wasteful in the use of chemicals when the process is bumped with large amounts
of input error to seek a response curve. Because of this, the general adjustment
guidelines described in section 6.2 are sufficient for almost all application tuning
for this instrument. Beyond this, many sources are available for classical tuning
methods.

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7.4 Manual PID Override Control

The Q45 PID output function allows the user to take manual control of the PID
control signal. This is often useful when starting up a control loop, or in the event
that you wish to bump the system manually to measure system response time.

To access the manual PID control, you must be in the MEASURE mode of
operation and you must have the PID output displayed on the lower line. This
line will indicate “XX.X% XX.X mA” with the X values simply indicating the
current values. With this display on the screen, press and hold the ENTER key
for about 5 seconds. You will see a small “m” show up between the % value and
the mA value. This indicates you are now in manual mode.

Once in manual, you may increase the PID output by pressing the UP arrow or
you may decrease the output by pressing the LEFT arrow. This will allow you to
drive the PID output to any desired setting.

To revert to normal PID control, press and hold the ENTER key again until the
“m” indicator disappears.

7.5 Common PID Pitfalls

The most common problem occurring in PID control applications involves the
false belief that proper settings on only the PID controller can balance any
process to an efficient level.

Close-loop control can only be effective if all elements in the loop are properly
selected for the application, and the process behavior is properly understood.
Luckily, the nature of simple chemical control process’ are generally slow in
nature. Therefore, even a de-tuned controller (one that responds somewhat
slowly) can still provide substantial improvements to setpoint control. In fact,
damaging oscillatory behavior is far more likely in tightly tuned controllers where
the user attempted to increase response too much.

When deciding on a PID control scheme, it is important to initially review all
elements of the process. Sticking valves, undersized pumps, or delays in
reaction times associated with chemical addition can have a dramatic effect on
the stability of the control loop. When controlling a chemical mix or reaction, the
sensor should be placed in a location that ensures proper mixing or reaction time
has occurred.

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The easiest processes to control with closed-loop schemes are generally linear,
and symmetrical, in nature. For example, controlling level in tank where the
opening of valve for a fixed period of time corresponds linearly to the amount that
flows into a tank. Chemical control process’ can be more problematic when the
nature of the setpoint value is non-linear relative to the input of chemical added.
For example, pH control of a process may appear linear only in a certain range of
operation, and become highly exponential at the extreme ranges of the
measuring scale. In addition, if a chemical process is not symmetrical, that
means it responds differentially to the addition and subtraction of chemical. It is
important in these applications to study steady-state impact as well as step­change impact to process changes. In other words, once the process has
apparently been tuned under normal operating conditions, the user should
attempt to force a dramatic change to the input to study how the output reacts. If
this is difficult to do with the actual process input (the recommended method), the
user can place the control in manual at an extreme control point such as 5% or
95%, and release it in manual. The recovery should not be overly oscillatory. If
so, the loop needs to be de-tuned to deal with that condition (reduce P and/or I.)

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Part 8 – Maintenance and Troubleshooting

8.1 System Checks

1. If the FAIL icon is flashing on the display, check the Fault List to determine
the cause of the failure. To access the Fault List, press the MENU/ESC key
until the DIAG menu appears. Then press the UP arrow key until the Fault
List appears. Press the ENTER key to access the Fault List, and the highest
priority fault message will be displayed. For a list of all messages and
possible causes/solutions, see message table at the end of this section.

2. In ALL environments, connect an earth ground jumper to earth terminal
connection on monitor.

3. Perform a two-point calibration with two fresh buffers prior to sensor
installation.

4. Check sensor cable color to terminal strip markings.

5. For highly unstable behavior, remove sensor from the process and measure
the process solution in a plastic beaker. If the reading now stabilizes, place
wire in beaker solution and actual process solution to determine if a ground
loop exists.

6. Verify that the black rubber shipping boot has been removed from the end of
the sensor prior to submersion. If the sensor has been left to dry out, allow
sensor to be submerged in buffer or water to re-hydrate for at least 4 hours.
The saltbridge may need replacement if the sensor has dried out for too long.

7. If the instrument 4-20 mA output is connected into other control systems,
disconnect output loop from system load and run through a handheld DMM to
monitor current. Verify that the system operates correctly in this mode first.

8.2 Instrument Checks

1. Remove sensor completely and connect 1100 Ohms from the yellow to black
sensor input leads. Make sure the unit is configured for a Pt1000 thermal
element and that the temperature is not in manual locked mode. Also,
connect a wire jumper from the red cable lead input to the green cable lead
input. The temperature reading should be approximately 25°C, the pH
reading should be approximately 7.00 pH, and the sensor mV reading should
be between -20 and +20 mV.

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2. With a DMM, measure the DC voltage from the white sensor lead connection
to the black sensor lead connection. With the positive DMM lead on the white
wire, the meter should read between -4.5 and -5.5 VDC.

3. With power disconnected, unplug the fuse from the power supply board and
verify continuity across the fuse.

8.3 Display Messages

The Q45 Series instruments provide a number of diagnostic messages that
indicate problems during normal operation and calibration. These messages
appear as prompts on the secondary line of the display or as items on the Fault
List as follows.

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Max is 200

Min is 200

Cal

Slope HIGH

Slope LOW

Offset HIGH

Out of

Locked!

Unlocked!

TC-F25

calibrations, change TC mode from F25

The following messages will appear as prompts:

MESSAGE

Unstable

Range

lock!

Entry failed, maximum value
allowed is 200.

Entry failed, minimum value
allowed is 200.

Calibration problem, data too
unstable to calibrate.

Sensor slope from calibration
is greater than 110%.

Sensor slope from calibration
is less than 80%.

Sensor offset from calibration
is less than –90 mV or
greater than +90 mV

Input value is outside
selected range of the specific
list item being configured.
Transmitter security setting is
locked.

Transmitter security has just
been unlocked.

The TC selection is in F25
mode, locked at 25 ºC

DESCRIPTION

POSSIBLE CORRECTION

Reduce value to ≤ 200

Increase value to ≥ 200

Clean sensor, get fresh cal solutions,
allow temperature and pH readings to
fully stabilize, do not handle sensor or
cable during calibration.
Get fresh cal solutions, allow
temperature and pH readings to fully
stabilize, check for correct buffer values
Clean sensor, get fresh cal solutions,
allow temperature and pH readings to
fully stabilize, check for correct buffer
values.
Clean or replace saltbridge, replace
reference cell solution, clean sensor,
get fresh cal solutions, allow
temperature and pH readings to fully
stabilize, check for correct buffer
values.
Check manual for limits of the function
to be configured.

Enter security code to allow
modifications to settings.

Displayed just after security code has
been entered.

Calibration and TC adjustment cannot

be performed while the TC is in F25
mode. To allow access to TC

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ATI Q46P pH System Part 8 – Maintenance and Troubleshooting

Sensor

The raw signal from the sensor is

Sensor Low

The raw signal from the sensor is

pH too High

pH too Low

Temp High

The temperature reading is > 110

test as described in sensor manual.

Temp Low

test as described in sensor manual.

TC Error

Meas Break

may falsely trip this diagnostic. Turn

Ref

Break

may falsely trip this diagnostic. Turn

The following messages will appear as items on the Fault List:

MESSAGE

High

DESCRIPTION

POSSIBLE CORRECTION

Check wiring connections to sensor.

too high.

Check wiring connections to sensor.

too low.
The pH reading is > 14.00 pH. The pH reading is over operating

limits.

The pH reading is < 0.00 pH. The pH reading is under operating

limits.
The temperature reading is over

ºC.

operating limits. Check wiring and
expected temp level. Perform RTD

Recalibrate sensor temperature

element if necessary.
The temperature reading is < -10
ºC

The temperature reading is under

operating limits. Check wiring and

expected temp level. Perform RTD

Recalibrate sensor temperature

element if necessary.
TC may be open or shorted. Check sensor wiring and perform

RTD test as described in sensor

manual.
Leakage detected on measuring
electrode of sensor.

Measuring electrode glass may be

cracked or broken. Electrical noise

Leakage detected on reference
electrode of sensor.

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off glass diagnostic feature and see

if sensor operates correctly. If it

does not, sensor must be replaced.

Reference glass electrode may be

cracked or broken. Electrical noise

off glass diagnostic feature and see

if sensor operates correctly. If it

does not, sensor must be replaced.

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pH Cal Fail

Clean sensor, get fresh cal solutions,

regenerate sensor (if necessary) and

redo calibration. If still failure, sensor

or offset

may be out of range. Perform sensor

tests as described in sensor manual.

TC Cal Fail

Clean sensor, check cal solution

temperature and repeat sensor temp

calibration function

6 ºC.

If still failure, perform sensor tests as

described in sensor manual.

Replace sensor if still failure. Note

that TC offset may also be adjusted

using the Cal TC Factor function

which involves no

Eeprom Fail

Internal nonvolatile memory

Chcksum

Display Fail

mV Cal Fail

Failure of factory temperature

MESSAGE

DESCRIPTION

Failure of pH calibration.

Failure of temperature calibration.

failure

POSSIBLE CORRECTION

slope may be less than 80%

Replace sensor if still failure.

calibration. TC
only allows adjustments of +/-

(See Section 6.5)
calibration reference solutions.
System failure, consult factory.

Fail

Internal software storage error. System failure, consult factory.

Internal display driver fail. System failure, consult factory.

Consult factory.

calibration.

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8.4 Cleaning the Sensor

Keep the sensor as clean as possible for optimum measurement accuracy - this
includes both the saltbridge and the measuring electrode glass. Frequency of
cleaning depends upon the process solution.

Carefully wipe the measuring end of the sensor with a clean soft cloth. Then

rinse with clean, warm water - use distilled or de-ionized water if possible. This
should remove most contaminate buildup.

Prepare a mild solution of soap and warm water. Use a non-abrasive detergent
(such as dishwashing liquid).

NOTE: DO NOT use a soap containing any oils (such as lanolin). Oils

can coat the glass electrode and harm sensor performance.

Soak the sensor for several minutes in the soap solution.

Use a small, extra-soft bristle brush (such as a mushroom brush) to thoroughly

clean the electrode and saltbridge surfaces. If surface deposits are not
completely removed after performing this step, use a dilute acid to dissolve the
deposits. After soaking, rinse the sensor thoroughly with clean, warm water.
Placing the sensor in pH 7 buffer for about 10 minutes will help to neutralize any
remaining acid.

NOTE: DO NOT soak the sensor in dilute acid solution for more than 5

minutes. This will help to prevent the acid from being absorbed into the
saltbridge.

WARNING: ACIDS ARE HAZARDOUS. Always wear eye and skin

protection when handling. Follow all Material Safety Data Sheet
recommendations. A hazardous chemical reaction can be created when
certain acids come in contact with process chemicals. Make this
determination before cleaning with any acid, regardless of concentration.

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8.5 Replacing the Saltbridge and Reference Buffer Solution

1. Hold the sensor with the process electrode pointing up. Place a cloth or towel
around the saltbridge. Turn the saltbridge counterclockwise (by hand) to
loosen and remove the saltbridge. Do NOT use pliers.

2. Pour out the old reference buffer by inverting the sensor (process electrode
pointing down). If the reference buffer does not run out, gently shake or tap
the sensor.

3. Rinse the reference chamber of the sensor with de-ionized water. Fill the
reference chamber of the sensor with fresh Reference Cell Buffer. The
chamber holds 6 to 7 mL of solution. MAKE SURE that 6 to7 mL is used
when refilling. The chamber should be FULL.

4. Inspect the new saltbridge to verify that there are 2 o-rings inside the
threaded section of the saltbridge

5. Place the new saltbridge over the ground assembly of the sensor. Place a
cloth or towel around the saltbridge and hand-tighten the saltbridge by turning
it clockwise.

NOTE: Every ATI Q25P Sensor includes a spare bottle of Reference

Buffer Solution, 7.0 pH. This is NOT typical pH 7 buffer, it is a special
“high-capacity” buffer developed to ensure the highest possible stability
of the reference portion of the pH measurement. No substitutions should
be made.

Figure 36 - Replacing the Saltbridge and Reference Buffer

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º

C RTD

Ω

8.6 Troubleshooting

The first step in resolving any measurement problem is to determine whether the
trouble lies in the sensor or the transmitter. Since measurement problems can
often be traced to dirty sensor electrode glass and/or saltbridge, cleaning the
sensor using the method outlined in Section 8.4 should always be the first step in
any troubleshooting.

If the sensor cannot be calibrated after cleaning, replace the saltbridge and
reference cell buffer 7 pH as outlined in Section 8.5.

If the sensor still cannot be calibrated, perform the following test. A multimeter, 7
pH buffer and another buffer at least 2 pH units away will be needed.

1. With transmitter power on and sensor connected, place the multimeter’s
positive (+) lead on the white position of the transmitter terminal strip and the
negative (-) lead on the black position. The multimeter should read between
–4.2 and –6.5 VDC.

2. Disconnect the sensor’s red, green, yellow, and white wires from the
transmitter or junction box. Re-check Step 1.

3. Place the sensor in pH 7 buffer. As in calibration, allow the temperatures of
the sensor and buffer to equilibrate at room temperature (approximately 25
ºC).

4. Verify that the sensor’s temperature element (Pt1000 RTD) is functioning
properly by measuring the resistance between the sensor’s yellow and black
wires. The nominal resistance value at 25 ºC is 1097 ohms. Use the
following table as a guide to the approximate resistance value:

5. Reconnect the yellow and white wires.

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25

30

35

1078

1097

1117

1136

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ATI Q46P pH System Part 8 – Maintenance and Troubleshooting

pH mV

6. Connect the multimeter’s positive (+) lead to the red wire and its negative (-)
lead to the green wire. With the sensor in the pH 7 buffer at approximately
20-30 ºC, measure the DC millivolts. The sensor offset reading should be
between –50 and +50 mV. If it is not, replace sensor reference solution and
saltbridge (See Section 8.5) and re-test.

7. With the multimeter connected as in Step 5, rinse the sensor with clean water
and place it in the second buffer. Allow the temperatures to equilibrate as
before. Now measure the sensor span reading. Use the following table to
determine approximate mV:

2.00

4.00

7.00

9.18

10.00

+296

+178

0

-129

-178

NOTE: The mV values listed above are for ideal conditions (sensor

offset = 0 mV) and therefore represent midpoints in a range. The table
shows the difference in mV which should be seen when going from one
pH value to another. For example, at 7.00 pH, the mV reading will be from
–50 to +50 mV (at room temperature) if the sensor is working properly. If
the reading is exactly +20 mV, then going to 4.00 pH buffer should
produce a reading of +198 mV, or a difference of +178 mV.

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Spare Parts

Part No. Description

07-0338 Q46P pH Monitor, 100-240 VAC
07-0339 Q46P pH monitor, 12-24 VDC
07-0340 Q46P pH monitor with Profibus, 100-240 VAC
07-0341 Q46P pH monitor with Profibus, 12-24 VDC
03-0397 Q46P Front Lid Assembly
03-0407 Q46 P/S Assy, 90-260VAC
03-0408 Q46 P/S Assy, 90-260VAC with 3rd 4-20mA output
03-0409 Q46 P/S Assy, 90-260VAC with 3 relay exp. board
03-0410 Q46 P/S Assy, 12-24 VDC
03-0411 Q46 P/S Assy, 12-24 VDC with 3rd 4-20mA output
03-0412 Q46 P/S Assy, 12-24 VDC with 3 relay exp. board
23-0029 Fuse, 630mA, 250V, TR-5 (for AC and DC Analyzers)

07-0100 Junction box
31-0057 Sensor interconnect cable
63-0017 ¾” NPT Flow “T” adapter for (63-0013)
63-0021 1” NPT Flow “T” adapter for (63-0013)
05-0068 Panel Mount Bracket Kit

07-0209 1” Flow Tee for Q25 Sensors
00-0628 Submersion Mounting Hardware
00-1527 Sealed Twist-Lock Flowcell, for 63-0013 sensors
07-0203 Insertion Assembly without Assist, 1¼”NPT, 316SS
07-0228 Insertion Assembly with Assist, 1¼”NPT, 316SS
07-0224 Insertion Assembly without Ball Valve, 1¼”NPT, 316SS
07-0223 Insertion Assembly without Assist, 1¼”NPT, CPVC
07-0221 1½” NPT Union/Tee Mount, CPVC (uses existing 1½” tee)
44-0219 1½” NPT Tee, Schedule 80, CPVC
07-0210 2” NPT Union/Tee Mount, CPVC (uses existing 2” tee)
44-0233 2” NPT Tee, Schedule 80, CPVC

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Q25 pH Sensors & Sensor Parts

07-0050 Q25P1-1-1 pH Sensor, 15 ft. cable
07-0051 Q25P2-1-1 pH Sensor, 15 ft. cable
07-0062 Q25P1-1-2 pH Sensor, 30 ft. cable
07-0063 Q25P2-1-2 pH Sensor, 30 ft. cable
07-0052 Q25P3 Antimony pH Sensor, 15 ft. cable
07-0077 Q25P1-3-1 SS pH Sensor, 15 ft. cable
07-0088 Q25P2-6 pH Sensor witth connector
07-0057 Q25P1-2-9 SS Insertion Sensor, specify cable length
07-0117 Q25P2-2-9 SS Insertion Sensor, specify cable length
07-0092 Q25P2-6Ag pH Sensor, Ag/AgCl Ref., with connector
07-0149 Q25P2-1-2Ag pH Sensor, 30 ft. cable, AgCl Ref.

05-0060 Saltbridge replacement for P1 Sensors
05-0066 Saltbridge replacement for P2 Sensors
09-0033 Differential pH/ORP Reference Cell Buffer
09-0052 Convention pH Reference Solution- AgCl Ref.

09-0034 pH 4 Buffer, 1000 mL
09-0036 pH 7 Buffer, 1000 mL
09-0037 pH 10 Buffer, 1000 mL

Conventional Sensors & Sensor Parts

63-0009 Submersible pH Sensor, 25’, Pt100
63-0013 Twist-Lock sensor, 25’, Pt100
63-0053 Lock-n-Load pH Sensor, 25’
63-0051 Lock-n-Load Temperature Compensator, 25’
63-0058 High Purity Water pH Sensor, 10 ft. cable

Lock/Unlock Code: 1464

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