ATI Technologies Q46H/65 User manual

O & M Manual
Model Q46H-65
Chlorine Dioxide 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
Phone: [phone] Saddleworth OL3 5DE
610-917-0991 Phone: [phone]
Fax: [phone] Fax: + 44 (0)1457-874-468
Email: [email protected] Email: [email protected]

2
O&M Manual
Rev-J (11/18)
Table of Contents
PART 1 - INTRODUCTION ......................................... 4
1.1 GENERAL ..........................................................4
1.2 STANDARD SYSTEM.............................................5
1.3 FEATURES .........................................................8
1.4 Q46H/65 SYSTEM SPECIFICATIONS.......................9
1.5 Q46H PERFORMANCE SPECIFICATIONS ................10
PART 2 –ANALYZER MOUNTING.............................12
2.1 GENERAL ........................................................12
2.2 WALL OR PIPE MOUNT .....................................13
2.3 PANEL MOUNTING ...........................................15
PART 3 –SENSOR/FLOWCELL MOUNTING ..............16
3.1 GENERAL ........................................................16
3.2 CONSTANT-HEAD FLOWCELL ..............................16
3.3 LOW-VOLUME FLOWCELL ..................................17
3.4 SEALED FLOWCELL............................................18
PART 4 –ELECTRICAL INSTALLATION.......................20
4.1 GENERAL ........................................................20
4.2 POWER CONNECTION........................................21
4.3 DIRECT SENSOR CONNECTION.............................24
4.4 SENSOR WIRING ..............................................25
4.5 JUNCTION BOX CONNECTION..............................26
4.6 OPTIONAL PHINPUT.........................................27
PART 5 –SENSOR ASSEMBLY ..................................29
5.1 CHLORINE DIOXIDE SENSOR PREPARATION............29
5.2 OPTIONAL PHSENSORS.....................................30
PART 6 –CONFIGURATION .....................................31
6.1 USER INTERFACE ..............................................31
6.11 KEYS ..............................................................32
6.12 DISPLAY..........................................................32
6.2 SOFTWARE......................................................33
6.21 SOFTWARE NAVIGATION ...................................34
6.22 MEASURE MENU [MEASURE] ..........................36
6.23 CALIBRATION MENU [CAL] ................................37
6.24 CONFIGURATION MENU [CONFIG]....................37
6.25 CONTROL MENU [CONTROL] ..........................42
6.26 DIAGNOSTICS MENU [DIAG].............................45
PART 7 –CALIBRATION...........................................49
7.1 CHLORINE DIOXIDE CALIBRATION ........................49
7.11 CLO2ZERO CAL ...............................................49
7.12 CLO2SPAN CAL ...............................................50
7.2 TEMPERATURE CALIBRATION ..............................51
7.3 PHCALIBRATION..............................................52
7.31TWO-POINT PHCAL ...........................................52
7.32 ONE-POINT PHCAL..........................................53
PART 8 –PID CONTROLLER DETAILS .......................54
8.1 PID DESCRIPTION.............................................54
8.2 PID ALGORITHM..............................................54
8.3 CLASSICAL PID TUNING.....................................56
8.4 MANUAL PID OVERRIDE CONTROL......................56
8.5 COMMON PID PITFALLS ....................................56
PART 9 –SYSTEM MAINTENANCE...........................58
9.1 GENERAL ........................................................58
9.2 ANALYZER MAINTENANCE..................................58
9.3 SENSOR MAINTENANCE.....................................58
9.4 SENSOR ACID CLEANING....................................59
9.5 Q22P SENSOR CLEANING ..................................59
9.6 REPLACING THE SALTBRIDGE AND REFERENCE
BUFFER SOLUTION.....................................................60
9.7 FLOW CELL MAINTENANCE ................................61
PART 10 –TROUBLESHOOTING ..............................62
10.1 GENERAL ........................................................62
10.2 EXTERNAL SOURCES OF PROBLEMS ......................62
10.3 ANALYZER TESTS ..............................................63
10.4 DISPLAY MESSAGES ..........................................63
10.5 SENSOR TESTS .................................................65
10.6 TROUBLESHOOTING (Q22P SENSOR)...................66
SPARE PARTS..........................................................67

3
O&M Manual
Rev-J (11/18)
TABLE OF FIGURES
FIGURE 1-TYPICAL CHLORINE DIOXIDE MONITORING SYSTEM..........................................................................5
FIGURE 2–CHLORINE DIOXIDE SYSTEM W/CONVENTIONAL PHSTYLE SENSOR .................................................6
FIGURE 3-SEALED FLOWCELL ASSEMBLIES WITH FLOW CONTROL....................................................................7
FIGURE 4-Q46 ENCLOSURE DIMENSIONS......................................................................................................12
FIGURE 5-WALL OR PIPE MOUNT BRACKET...................................................................................................13
FIGURE 6-WALL MOUNTING DIAGRAM...........................................................................................................14
FIGURE 7-PIPE MOUNTING DIAGRAM ............................................................................................................14
FIGURE 8-PANEL MOUNT CUTOUT................................................................................................................15
FIGURE 9-CONSTANT HEAD FLOWCELL DETAILS ...........................................................................................16
FIGURE 10 -LOW VOLUME FLOWCELL ASSEMBLY...........................................................................................17
FIGURE 11 -SEALED FLOWCELL DETAILS .......................................................................................................18
FIGURE 12 -SEALED PHFLOWCELL DETAILS..................................................................................................19
FIGURE 13 -LINE POWER CONNECTIONS........................................................................................................21
FIGURE 14 -OPTIONAL RELAY BOARD WIRING ...............................................................................................22
FIGURE 15 -OPTIONAL RELAY BOARD WIRING ...............................................................................................23
FIGURE 16 -OPTIONAL ANALOG OUTPUT WIRING ...........................................................................................23
FIGURE 17 -SENSOR CABLE PREPARATION....................................................................................................24
FIGURE 18 -DIRECT SENSOR CONNECTION....................................................................................................25
FIGURE 19 -JUNCTION BOX INTERCONNECT WIRING.......................................................................................26
FIGURE 20 -JUNCTION BOX WIRING W/OPTIONAL PHCOMP............................................................................28
FIGURE 21 -CLO2 SENSOR ASSEMBLY..........................................................................................................29
FIGURE 22 -USER INTERFACE .......................................................................................................................31
FIGURE 23 -SOFTWARE MAP.........................................................................................................................35
FIGURE 24 -AUTOMATIC PHBUFFER TABLES .................................................................................................41
FIGURE 25 -CONTROL RELAY EXAMPLE.........................................................................................................44
FIGURE 26 -ALARM RELAY EXAMPLE.............................................................................................................45
FIGURE 27 -Q46H ISA PID EQUATION..........................................................................................................54
FIGURE 28 -REPLACING SALTBRIDGE AND REFERENCE BUFFER .....................................................................61
FIGURE 29 -Q46H DISPLAY MESSGES...........................................................................................................64
FIGURE 30 -Q46H DISPLAY MESSAGES (CONTINUED)....................................................................................64
FIGURE 31 -PT100 RTD TABLE ....................................................................................................................65

4
O&M Manual
Rev-J (11/18)
Part 1 - Introduction
1.1 General
The Model Q46H/65 is a versatile on-line monitoring system designed for the continuous
measurement of chlorine dioxide in solution. The full scale operating range of the system may be
selected by the user for 0-200.0 ppb, 0-2.000 ppm, 0-20.00 ppm, or 0-200.0 ppm, and the
sensing system will operate on water streams with temperatures ranging from 0 to 55

C. The
Q46H/65 ClO2Measurement System is well suited for potable water systems, cooling tower
monitoring, food wash water systems, or other ClO2 treated water applications.
The basic sensing element used in the chlorine dioxide monitor is a polarographic membrane
sensor which measures dissolved ClO2directly. Water simply flows past the sensor and directly
to drain, with the flow rate and pressure across the sensor controlled by a constant head flow cell
assembly. The chlorine dioxide measurement does not alter the sample or add any chemicals to
the sample stream, so the water flow can return to the system if desired.
Q46H/65 Monitors are available in two basic electronic versions, a 90-260VAC powered monitor,
or a 12-24VDC powered monitor –both with three relays and two 4-20 mA analog outputs. Both
versions allow flexible output options which include an additional 4-20 mA current output,
additional 0-30V signal relays, PID control, and digital communication cards.
In addition to chlorine dioxide measurement, the Q46H/65 is also available with an optional pH
input which provides a two-parameter monitoring system. Both dissolved ClO2and pH are
displayed simultaneously, and outputs are available for both chlorine dioxide and pH.
Digital communication options for Profibus-DP, Mobus-RTU, and Ethernet-IP are supported in the
Q46 series of products. If your monitor contains a communication card, a separate manual is
provided for that protocol. Consult that manual for information regarding wiring requirements for
your system.

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
5
O&M Manual
Rev-J (11/18)
1.2 Standard System
The standard model Q46H/65 system includes three main components, the Q46H analyzer, a
constant head flow cell, and a ClO2sensor. A sealed flowcell is also available for applications
where sample flow rate and pressure can be carefully controlled. Figure 1 shows a typical
installation.
For connection of the sensor to the electronics, a 25 foot cable is supplied. An additional 100 feet
of interconnect cable may be added using #07-0100 junction box. All required spare parts are
also provided with the basic system, including spare membranes, electrolyte, o-rings, and any
special hardware.
Note that standard 25 foot sensor cables for both ClO2and optional pH sensors can be cut to a
shorter length. Cutting the cables will not affect performance, and elimination of extra cable can
sometimes eliminate electrical noise pickup through the cables.
Figure 1 - Typical Chlorine Dioxide Monitoring System

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
6
O&M Manual
Rev-J (11/18)
Figure 2 below shows the same standard flowcell assembly and ClO2sensor along with the
conventional type pH sensor. A special adapter is required to hold the pH sensor in its proper
location in the flowcell inlet chamber.
Figure 2 –Chlorine Dioxide System w/Conventional pH Style Sensor

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
7
O&M Manual
Rev-J (11/18)
Figure 3 below shows an installation using a 00-1522 sealed flowcell for the ClO2sensor and a 00-1527
sealed flowcell for the pH sensor. This type of installation requires careful flow control. We recommend
the use of our 03-0372 flow control assembly when using sealed flowcells. This assembly consists of an
in-line filter and a fixed-flow regulator which will maintain a constant 400 cc/min flow rate through the
system. This flow will be maintained so long as inlet pressures are between 5 and 125 PSIG. The in-line
filter is used mainly to protect the flow control element against larger particles that might cause plugging
of the device.
Figure 3 - Sealed Flowcell Assemblies with Flow Control

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
8
O&M Manual
Rev-J (11/18)
1.3 Features
Standard Q46H analyzers have fully isolated inputs and outputs. Analog outputs are additionally
completely isolated from each other.
Available in either 90-260VAC or 12-24 VDC power supply systems. All features remain the
same in both variations.
High accuracy, high sensitivity system, measures from 20 ppb to 200.0 ppm through 4 internal
automatic ranges. User ranges of 200.0 ppb, 2.000 ppm, 20.00 ppm, or 200.0 ppm.
Output Hold, Output Simulate, Output Alarm, and Output Delay Functions. All forced changes in
output condition include bumpless transfer to provide gradual return to on-line signal levels and to
avoid system control shocks on both analog outputs.
Three6 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 low voltage signalsis 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 and Modbus-RTU. Ethernet-IP is pending.
Two analog outputs may be configured to track ClO2and temperature, ClO2and ClO2, or ClO2
and pH. Both analog outputs can be individually programmed to fail to specific values. An
optional third analog output is available, providing separate outputs for ClO2, pH, and
temperature.
Selectable Output Fail Alarm feature allows system diagnostic failures to be sent to external
monitoring systems.
Large, high contrast, custom LCD display with LED back light provides excellent readability in any
light conditions. The secondary line of display utilizes 5x7 dot matrix characters for clear
message display. Two of four measured parameters may be on the display simultaneously.
Diagnostic messages provide a clear description of any problem with no confusing error codes to
look up. Messages are also included for diagnosing calibration problems.
Quick and easy one-point calibration method and sensor zero-cal. To provide high accuracy, all
calibration methods include stability monitors that check temperature and main parameter stability
before accepting data.
High accuracy three-wire Pt100 temperature input. Temperature element can be user calibrated.
Security lock feature to prevent unauthorized tampering with analyzer settings. All settings can
be viewed while locked, but they cannot be changed.

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
9
O&M Manual
Rev-J (11/18)
1.4 Q46H/65 System Specifications
Displayed Parameters Main input, 0.1 ppb (0.0001 ppm) to 200.0 ppm
Sensor temperature, -5.0 to 55.0 °C (23 to 131 ºF)
Sensor Current, 0.0–999.9 nA, 0.000 to 99.99 uA
Loop current, 4.00 to 20.00 mA
Sensor slope/offset
Model number and software version
PID Controller Status
Optional pH Input value.0.00 to 14.00 pH
Main Parameter Ranges Manual selection of one of the following ranges,
0.000 to 200.0 ppb
0.0 to 2.000 ppm
0.00 to 20.00 ppm
0.00 to 200.0 ppm
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 with tactile feedback, polycarbonate with
UV coating
System Weight Approximately 5 lbs. (2.3 Kg) with sensor &flowcell
Ambient Temperature Analyzer Service, -20 to 60 °C (-4 to 140 ºF)
Sensor Service, -5 to 55°C (23 to 131 °F)
Storage, -5 to 70 °C (-22 to 158 ºF)
Ambient Humidity 0 to 95%, indoor/outdoor use, non-condensing to rated ambient
temperature range
Altitude Maximum 2000 m (6562 ft.)
Electrical Certification Ordinary Location, cCSAus (CSA and UL standards - both
approved by CSA), pollution degree 2, installation category 2
EMI/RFI Influence Designed to EN 61326-1
Output Isolation 600 V galvanic isolation
Filter Adjustable 0-9.9 minutes additional damping to 90% step input
Temperature Input Pt100 RTD, 3-wire type
Sensor 2-electrode polarographic membraned sensor for direct
measurement of ClO2
Sensor Materials PVC and stainless steel
Sensor Cable 25 ft. (7.5 meter) cable with 6-pin plug

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
10
O&M Manual
Rev-J (11/18)
Max. Sensor-to-Analyzer 100 feet (30.5 meters), with junction box
Distance
Optional pH Input Accepts standard combination or Q22P pH Sensors
Flow Cell Constant head overflow, clear cast acrylic, 7-30 GPH, 15 GPH
recommended, inlet is ¼” hose barb at 1/8” MNPT, outlet is ½”
hose barb at 3/8” MNPT
Power 90 - 260 VAC, 50-60 Hz, 10 VA max or
12-24 VDC, 500 mA max.
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.
Optional Relays: Three additional non-isolated low power relays available. SPST,
1 Amp @ 30 VDC.
Analog Outputs Two 4-20 mA outputs. Output one programmable for PPM ClO2
or PID. Output 2 programmable for PPM ClO2, Temperature, or
pH. Max load 500 Ohms for each output. Outputs ground
isolated and isolated from each other. An additional 3rd analog
option is available.
1.5 Q46H Performance Specifications
Accuracy 0.5% of selected range or 0.02 PPM
Repeatability 0.3% of selected range or 0.01 PPM
Sensitivity 0.05% of selected range
Non-linearity 0.1% of selected range
Warm-up Time 3 seconds to rated performance (electronics only)
Supply Voltage Effects ± 0.05% span
Instrument Response Time 60 seconds to 90% of step input at lowest damping

ATI Q46H/65 Residual Chlorine Dioxide System Part 1 - Introduction
11
O&M Manual
Rev-J (11/18)
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.

12
O&M Manual
Rev-J (11/18)
Part 2 – Analyzer Mounting
2.1 General
All Q46 Series instruments offer maximum mounting flexibility. A bracket is included with each
unit 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 sensor-to-instrument distance should not exceed 100 feet. To
maximize signal-to-noise ratio however, work with the shortest sensor cable possible. The
standard cable length of the ClO2sensor is 25 feet.
Refer to Figure 4 for overall dimensions of the Q46 monitor.
Figure 4 - Q46 Enclosure Dimensions

ATI Q46H/65 Residual Chlorine Dioxide System Part 2 –Analyzer Mounting
13
O&M Manual
Rev-J (11/18)
2.2 Wall or Pipe Mount
A PVC mounting bracket with attachment screws is supplied with each analyzer (see Figure 5for
dimensions). 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 (Figure 6) 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 (Figure 7). 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 5 - Wall or Pipe Mount Bracket

ATI Q46H/65 Residual Chlorine Dioxide System Part 2 –Analyzer Mounting
14
O&M Manual
Rev-J (11/18)
Figure 6 - Wall Mounting Diagram
Figure 7 - Pipe Mounting Diagram

ATI Q46H/65 Residual Chlorine Dioxide System Part 2 –Analyzer Mounting
15
O&M Manual
Rev-J (11/18)
2.3 Panel Mounting
Panel mounting uses the panel mounting flange molded into the rear section of the enclosure.
Figure 8provides 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 8 - Panel Mount Cutout

16
O&M Manual
Rev-J (11/18)
Part 3 – Sensor/Flowcell Mounting
3.1 General
Select a location within the maximum sensor cable length for mounting of the sensor flow cell.
3.2 Constant-Head Flowcell
Dissolved ClO2sensors are best used in a constant-head overflow chamber because variations in
sample flow rate and pressure can cause unstable readings. When monitoring low
concentrations (below 0.5 PPM), this method should always be used.
Mechanical installation of the flow cell requires that it be mounted to a wall or other convenient
flat surface. Alternatively, the mounting holes on the plate will accommodate a 2" U-bolt for
mounting the plate to a 2" pipe. Figure 9 shows the dimensions and mounting hole locations for
the flow cell. Be sure to allow enough clearance on the left side of the flow cell for insertion and
removal of the sensor. About 12 inches clearance is recommended.
Figure 9 - Constant Head Flowcell Details

ATI Q46H/6 Residual Chlorine Dioxide System Part 3 –Sensor/Flowcell Mounting
17
O&M Manual
Rev-J (11/18)
Once mounted, inlet and drain connections must be made. The flow cell contains a ⅛" MNPT
inlet connection and a ⅜" MNPT drain connection. Hose barbs for the inlet and drain connections
are supplied with the flow cell for use with flexible tubing. The inlet hose barb is used with ¼" I.D.
tubing and the drain hose barb is used with ½" I.D. tubing.
3.3 Low-Volume Flowcell
Dissolved ClO2 sensors can sometimes be used in special low-volume flow cells to reduce the
amount of water consumed by the monitor. This flow cell contains hose barbs for ¼” I.D. tubing
on the inlet and outlet. The female thread in the flow cell is 1/8” NPT, and other fitting may be
used in place of the hose barbs if desired. See Figure 10.
Figure 10 - Low Volume Flowcell Assembly

ATI Q46H/6 Residual Chlorine Dioxide System Part 3 –Sensor/Flowcell Mounting
18
O&M Manual
Rev-J (11/18)
Great care must be taken in using the low-volume flow cell. Passages are very small, so only
very clean water may be put through this type of system. The suggested flow rate is 150-300
cc/min., but the flow rate must be maintained precisely. The flow rate should not be allowed to
vary by more than ± 5 cc/min. A rotameter installed on the inlet side of the flow cell should be
used to set and maintain the flow. The drain line should contain a vacuum break if the outlet
tubing is more than 3 feet (1 meter) in length.
To avoid air bubbles trapping under the membrane in the flow cell, the flow cell should be
mounted in the horizontal plane with the inlet at the bottom and the outlet at the top. With flow
always moving upward, air will be swept out of the cell and will not accumulate. Figure 10 shows
mounting of the low volume flow cell using the optional clamp assembly.
3.4 Sealed Flowcell
Applications where the sample inlet flow is well controlled can use a simpler sealed flowcell.
Using this flowcell requires that flow be controlled externally to about 400 cc/min. Variable flow
rate or variable pressure will cause unstable readings in this flowcell. ATI offers a special flow
control element that can be used ahead of this flowcell on the incoming sample line. The flow
control is part no. (55-0048). It will control the inlet flowrate at 400 cc/min. with inlet pressure
variations from 5-150 PSIG. A 50 micron y-strainer ahead of the flow control element is
recommended. The sealed flowcell provides a drain vent with check valve to avoid pulling a
vacuum on the flow chamber.
Figure 11 - Sealed Flowcell Details

ATI Q46H/6 Residual Chlorine Dioxide System Part 3 –Sensor/Flowcell Mounting
19
O&M Manual
Rev-J (11/18)
Figure 12 - Sealed pH Flowcell Details

20
O&M Manual
Rev-J (11/18)
Part 4 – Electrical Installation
4.1 General
The Q46 is powered in one of two ways, depending on the version purchased. The 12-24VDC
powered analyzer requires a customer supplied DC power supply. The 90-260VAC 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 TB7and 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.
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.