Chemtrac SCM2500XRD, SCC3500XRD Operation Manual

OPERATIONS MANUAL

SCC3500XRD

SCM2500XRD

Streaming Current Monitor &

Streaming Current Controller

with Dura-Trac

R 4 8/2/06 RA

™

Remote Sensor

TABLE OF CONTENTS

Section Title Page

IMPORTANT INSTRUCTIONS .......................................................................... 4

WARRANTY INFORMATION............................................................................. 5

1.0 GENERAL INFORMATION................................................................................ 6

1.1 Description of Operation ............................................................................ 6

1.2 Selecting Proper Sample Point .................................................................. 6

1.3 Process Control Procedures ...................................................................... 8

1.4 System Components ................................................................................. 9

1.5 Technical Specifications ............................................................................ 10

2.0 MOUNTING AND INSTALLATION..................................................................... 12

2.1 Mounting Location ..................................................................................... 12

2.2 Power Requirement ................................................................................... 12

2.3 Signal Wiring ........................................................................................ 14

2.4 Sample Connection ................................................................................... 15

2.5 Sensor Flush Options ................................................................................ 16

2.5.1 Dura-Trac with Flush ....................................................................... 16

2.5.2 Sensor Maintenance Module ........................................................... 17

3.0 OPERATION ........................................................................................ 19

3.1 Monitor/Controller User Interface............................................................... 19

3.2 SCM2500XRD Readout, Menus and Controls ........................................... 20

3.2.1 SCM2500XRD Main Screen ........................................................... 20

3.2.2 SCM2500XRD Setup Menu (1)........................................................ 21

3.2.3 SCM2500XRD Setup Menu (2)........................................................ 22

3.2.4 SCM2500XRD Alarm Status Menu .................................................. 23

3.2.5 SCM2500XRD Flush Control Menu ................................................. 24

3.3 SCC3500XRD Readout, Menus, and Controls........................................... 24

3.3.1 SCC3500XRD Main Screen ............................................................ 24

3.3.2 SCC3500XRD Setup Menus............................................................ 25

3.3.3 SCC3500XRD Alarm Status Menu .................................................. 26

3.3.4 SCC3500XRD Pump Control (1) Menu............................................ 27

3.3.5 SCC3500XRD Pump Control (2) Menu............................................ 29

3.3.6 SCC3500XRD Flow Control (3) Menu.............................................. 29

3.3.7 SCC3500XRD Flush Control Menu.................................................. 31

3.4 System operation....................................................................................... 33

3.5 Treatment Optimization Procedure ............................................................ 34

3.6 Manual Control Using Controller ................................................................ 35

3.7 Automatic Control ...................................................................................... 35

3.8 Automatic Control Setup............................................................................ 38

3.9 Flow Control ........................................................................................ 38

3.10 Tuning Constant Specifications ................................................................. 39

4.0 GENERAL GUIDELINES ................................................................................... 41

4.1 Streaming Current Value Response Factors.............................................. 41

4.2 Fundamental Streaming Current Knowledge ............................................. 42

Page 2

TABLE OF CONTENTS (Continued)

Section Title Page

5.0 TROUBLESHOOTING GUIDES......................................................................... 45

6.0 MAINTENANCE PROCEDURES ....................................................................... 47

6.1 Replacement Procedures .......................................................................... 47

6.2 Cleaning Procedures ................................................................................. 47

6.3 Replacement Parts .................................................................................... 48

6.4 Ordering Information.................................................................................. 50

7.0 Mechanical Specifications............................................................................... 53

LIST OF FIGURES

Figure Title Page

1 Streaming Current Profile ................................................................................. 7

2 System Components ........................................................................................ 9

3 Monitor/Controller Power Wiring ....................................................................... 12

4 Dura-Trac Sensor Power Wiring ....................................................................... 13

5 Dura-TRAC II Sensor Power Wiring.................................................................. 13

6 Signal Wires Interconnection Diagram.............................................................. 14

7 Dura-TRAC Sensor Sample Connection ........................................................... 15

8 Dura-TRAC II Sensor Sample Connection ........................................................ 16

9 Dura-TRAC Sensor with Flush.......................................................................... 17

10 SMM Tubing Connections to Dura-Trac II Sensor............................................. 18

11 Automatic Flush Timing Diagram ...................................................................... 33

12 Dura-Trac Sensor Parts Identification ............................................................... 49

13 Dura-Trac II Sensor Parts Identification ............................................................ 50

14 Streaming Current Monitor/Controller Dimensions ............................................ 53

15 Dura-Trac Sensor Dimensions.......................................................................... 54

16 Dura-Trac II Sensor with SMM Dimensions....................................................... 54

17 Dura-Trac Sensor with Flush Dimensions ......................................................... 55

18 Dura-Trac II Sensor Dimensions....................................................................... 56

19 SMM Dimensions ........................................................................................ 56

Chemtrac Systems, Inc.

Page 3

IMPORTANT INSTRUCTIONS

When using this instrument, basic safety precautions shall always be followed to
reduce the risk of fire, electrical shocks and injury to persons, including the
following:

R Before attempting to unpack, set up, or operate this instrument, please

read this entire manual.

R Make certain the unit is disconnected from the power source before

attempting to service or remove any component.

R Follow all warnings and marked on the instrument.

R Failure to follow these precautions could result in personal injury or

damage to the equipment.

R Do not attempt to disassemble the unit.

R Water must not be allowed to enter the housing of the unit.

R Close and fasten the covers of the unit prior to any external cleaning to

prevent water ingress.

R Do not drop or jar the unit.

R Do not modify any internal electrical wiring or electronics.

R Use a mild non-abrasive cleanser when cleaning the outer cover of the

unit.

SAFETY PRECAUTIONS

In order to provide maximum user safety this instrument was designed with all electrical
circuitry enclosed within a protective non-conductive housing. The label below will be
visible at any location where high voltage is present.

Chemtrac Systems, Inc.

Page 4

WARRANTY INFORMATION

Chemtrac® Systems, Inc. warrants its equipment to be free from defects in
material and workmanship for a period of one (1) year from date of shipment to
the original purchaser. Upon receipt of written notice from purchaser, seller shall
repair or replace the equipment (at option of Chemtrac® Systems, Inc.).

Chemtrac® Systems, Inc. assumes no responsibility for equipment damage or
failure caused by:

1. Improper installation, operation, or maintenance of equipment.

2. Abnormal wear and tear on moving parts caused by some processes.

3. Acts of nature (i.e. lightning, etc.)

This warranty represents the exclusive remedy of damage or failure of
equipment. In no event shall Chemtrac® Systems, Inc. be liable for any special,
incidental, or consequential damage such as loss of production or profits.

Should you experience trouble with the equipment, please contact:

Chemtrac Systems, Inc

6991 Peachtree Industrial Blvd., Building 600
Norcross, GA 30092

Phone: [phone] (Inside US only), 770-449-6233
Fax: [phone]
Email: [e-mail]
Website: www.chemtrac.com

Chemtrac Systems, Inc.

Page 5

SECTION 1.0 GENERAL INFORMATION

1.1 DESCRIPTION OF OPERATION

The Streaming Current Monitor/Controller includes a remote sensor module placed at
the desired sample point, and a Monitor/Controller module. The monitor is a charge­measuring device. The charge that it measures is the net ionic and colloidal surface
charge (positive and negative) in the sample being tested. Streaming current is related
to zeta potential, however, they are not the same value.

The treated water sample flows into the sample cell where it is drawn into the bore
during the upstroke of the piston cycle and is expelled from the bore on the piston down
stroke. Particles contained in the water are temporarily immobilized on the piston and
cylinder surfaces. As the water is moved back and forth by the piston, charges
surrounding these particles (+ and -) are moved downstream to the electrodes. This
movement of like charges causes an alternating current to be generated, defined as
"streaming current." A signal gain selector, accessed through the menu screen, is used
to select the best signal amplification. The signal amplification should be set where a
normal change in dosage results in a desired deviation in streaming current (normally 30
units). The displayed streaming current value (SCV) should be considered as a relative
reading due to amplification of the primary signal.

The streaming current amplitude and polarity is a function of sampling location in the
treatment process. It is important to understand why the streaming current varies at
different points in the system to properly interpret the readings, therefore, Section 1.2
should be read very carefully.

1.2 SELECTING PROPER SAMPLE POINT

The sample must be taken at a point where uniform distribution and mixing of coagulant
is obtained for all flow rate conditions, and at a point that allows for a quick response to
chemical feed changes as measured by the monitor (i.e. after the rapid mixer or static
mixer, and before the slow mixer or flocculation basin). The lag time, or the amount of
time it takes the water to travel from the point of chemical addition to the sensor, should
be no greater than 3 minutes (30 seconds to 1.5 minutes are typical lag times). If
uniform distribution and mixing is not being obtained at a selected sample point, the
streaming current reading will oscillate. If the chemical is not being properly mixed
(indicated by an oscillating monitor reading), the sample point needs to be moved
further downstream away from the mixing device to allow the chemical more time to mix
in with the water. Under rare circumstances, moving the sample point further
downstream in order to obtain a more stable reading may result in a lag time longer than
3 minutes. Steps should be taken to improve chemical mixing under these conditions.

When possible, avoid sampling from places where sludge, grit, etc., will be drawn into
the sensor sample cell. Sample lines must be sized to provide velocities that will
prevent floc/sludge accumulation. Keep sample lines as short as possible to minimize
delay in response time.

Figure 1, Streaming Current Profile, normally observed in a typical water plant. When
coagulant is added to raw water, the charge neutralization process begins immediately.
The time required for this neutralization process to go to completion is primarily a
function of mixing, time, raw water characteristics, type of coagulant, and to a lesser

Chemtrac Systems, Inc.

Page 6

degree, temperature. Untreated raw water has a net negative charge. Cationic
coagulant charges, (alum, polymer, etc.) can produce a net positive streaming current
early in the system. As shown on the graph, this current becomes less positive as
negative charges react with the coagulant. At the settling basin outlet, the streaming
current value can return to nearly the same as raw water. If raw water flow or sample
flow rate is increased, the total time for the sample to travel from point of coagulation
injection to the cell is decreased. This may cause a change in monitor reading (in the
positive direction), even though the coagulant dosage (PPM) remains constant.
Conversely, if raw water or sample flow rate is decreased, streaming current readings
may go more negative. Plants that have a shifting set point caused by wide swings in
raw water flows can minimize this effect by moving the sample point further
downstream, lengthening sample line, or adding a detention pot. It is important to
maintain the sample flow at +/- 10% of the rate initially set.

Based upon the above discussion, the proper sample point for a specific plant depends
upon the following conditions:

1. Point or points of coagulant feed.

2. Mixing efficiency of raw water and coagulant.

3. Magnitude of raw water flow swings.

4. Type and quantity of coagulants used.

Chemtrac Systems, Inc.

FIGURE 1. Streaming Current Profile

Page 7

1.3 PROCESS CONTROL PROCEDURES

Model SCC3500XRD Only

In order for the monitor to be used for automatically controlling the coagulant feed
(alum, polymer, ferric chloride), the following guidelines must be followed:

1. The coagulant must be thoroughly mixed with the raw water by the time the
sample is taken.

2. “Lag time” (i.e., the time it takes for the monitor to see a change in coagulant
feed) should be no greater than 5 minutes.

3. Variability in sample flow rates should be no greater than +/- 10 % of the initial
rate.

4. Coagulant pumps must be kept in good mechanical condition to respond quickly
and accurately to process changes.

5. Raw water quality should be in a stable condition (turbidity, pH, color, etc. should
not change rapidly or widely) when setting up the system.

The monitor should be operated a few days in manual control to observe how it
responds to normal process operation. Recording streaming current changes on a strip
chart recorder is very helpful in anticipating factors that may have to be dealt with when
automatic control is started. This period, if using the monitor with a recorder for
monitoring, is also a good time to determine the optimum coagulant dosage and
establish the operating “setpoint”. This enables the system to be put on automatic
control very simply.

Chemtrac Systems, Inc.

Page 8

1.4 SYSTEM COMPONENTS

The SCM2500XRD and SCC3500XRD system include the following:

q Monitor/Controller

q Dura-Trac Remote Sensor

q Dura-Trac Remote Sensor with Flush (Optional)

q Dura-Trac II Remote Sensor (Optional)

q Sensor Maintenance Module (Optional)

Figure 2 illustrates system components.

MONITOR/CONTROLLER

SCC3500XRD

Power
Service
Diag.
Alarm

CHEMTRAC

SYSTEMS, INC.

SEMSOR MAINTENANCE MODULE

DURA-TRAC SENSOR OR DURA-TRAC SENSOR WITH FLUSH

CHEMTRAC

SYSTEMS, INC.

PATENTED MADE IN U.S.A.

DURA-TRAC

TM

CHEMTRAC

SYSTEMS, INC.

PATENTED MADE IN U.S.A.

DURA-TRAC

TM

DURA-TRAC II SENSOR

Chemtrac Systems, Inc.

CHEMTRAC

SYSTEMS, INC.

TM

PATENTED MADE IN U.S.A.

DURA-TRAC II

FIGURE 2. System Components

Page 9

OPERATOR

MANUAL

1.5 TECHNICAL SPECIFICATIONS

MONITOR/CONTROLLER

Power ...................................... 85-264 VAC, 47–63 Hz

Current Load ........................... 110 VAC @ 0.5A Max

220 VAC @ 0.25A Max

User Interface.......................... Backlit Liquid Crystal Display, Menu Driven Functions,

Keypad Interface

SCV Readout .......................... -1000 to +1000

Resolution ............................... Streaming Current Units

Signal Gain.............................. User Adjustable 1X to 20X

Zero Offset .............................. Automatic, Full Scale All Ranges

Accuracy ................................. 0.5% of Full Scale

Response Time ....................... 1 Second

SCV Output Signal .................. Standard 4-20 mA (300 ohm Load)

Optional 0-10 VDC

Alarm Output ........................... 24 VDC (Solid State Relay Optional) and Auditable

Alarm for Sensor Status, High/Low Streaming Current

Value and High/Low Pump Output - SC3500XRD Only

Digital Input ............................ Dry Contacts

Enclosure Type ....................... NEMA 250 Type 4X, Reinforced Fiberglass

Enclosure Size ........................ 9.2”W, 11.2”H, 6.3”D (234mm W, 285mm H, 161mm D)

Mounting Holes ....................... 11.25”W, 7.4”H (286mm W, 188mm H)

Weight..................................... 6 Pounds (2.72 kg)

Control Output Alarms............. Adjustable High/Low Alarms

Operating Temperature ........... 32° F to 120° F (0° C to 49° C)

Following Parameter are for SCC3500XRD Only

PID Tuning Parameters........... Proportional Gain: Range 0-1000

Integral Time: Range 0-1000
PID Rate: Range 1-20

SmartTrac PID Control ............ SCC3500XRD Only

Analog Input ............................ 4-20 mA

Control Output Signal .............. 4 – 20 mA (300 Ohm Load) or 0 – 10 VDC

Control Output Limits............... Adjustable High/Low Limits

Dura-Trac REMOTE SENSOR

Power ...................................... 115 VAC, 60 Hz (standard)

230 VAC, 50 Hz (optional)

Sample Flow Rate ................... 5.0 GPM

Sample Cell Type .................... External Receiver, High Flow

Probe Type.............................. Quick Replacement Cartridge

Water Sample Connections..... Inlet: 3/4” O.D. Barb Type, Outlet: 1” O.D.

Materials Contacting Sample... Delrin, Nylon, Neoprene Viton, PVC, Stainless Steel

Chemtrac Systems, Inc.

Page 10

Dura-Trac REMOTE SENSOR (Continue)

Output Wiring .......................... 4 Conductors Twisted Shielded Pair, 20 AWG

(6 Conductors Twisted Shielded Pair with Flush Option)

Enclosure Type ....................... NEMA 250 Type 4X, Reinforced Fiberglass

Enclosure Size ........................ 11.2”W, 9.2”H, 6.3”D (285mm W, 234mm H, 161mm D)

Mounting Holes ....................... 7.4” W, 11.25” H (188mm W, 286mm H)

Overall Height with Sensor ...... 14.7’’ (373mm)

Weight..................................... 10 Pounds (4.5 kg)

Operating Temperature ........... 32° F to 120° F (0° C to 49° C)

Dura-Trac WITH FLUSH (OPTION):

Flush Water Connections ........ ¼’’ Quick Connect Tube Fitting, Adaptable

Flush Water Pressure…. ......... 35 to 80 PSI

Overall Height with Sensor ...... 17.6’’ (447mm)

Dura-Trac II REMOTE SENSOR

Power ...................................... 115 VAC, 60 Hz (standard)

230 VAC, 50 Hz (optional)

Sample Flow Rate ................... 10 GPM

Sample Cell Type .................... External Receiver, High Flow

Probe Type.............................. Quick Replacement Cartridge

Water Sample Connections..... Inlet: 3/4” O.D. Barb Type, Outlet: 1-1/2” O.D.

Materials Contacting Sample... Delrin, Nylon, Neoprene Viton, PVC, Stainless Steel

Output Wiring .......................... 4 Conductors Twisted Shielded Pair, 20 AWG

(6 Conductors Twisted Shielded Pair with Flush Option)

Enclosure Type ....................... NEMA 250 Type 4X, Reinforced Fiberglass

Enclosure Size ........................ 11.2”W, 9.2”H, 6.3”D (285mm W, 234 mm H, 161mm D)

Overall Height with Sensor ...... 18.8’’ (477mm) without SMM Option

21.8’’ (554mm) with SMM Option

Mounting Holes ....................... 9.7”W x 10.5”H (247mm W x 266mm H)

Weight..................................... 15 Pounds (6.8 kg)

Operating Temperature ........... 32° F to 120° F (0° C to 49° C)

SENSOR MAINTENANCE MODULE (OPTIONAL)

Power ...................................... 24 VDC (Supplied From Monitor)

Flush Water Connections ........ ¼’’ Quick Connect, Adaptable

Flush Water Inlet PSI .............. 35 to 80 PSI

Chemical Injection Pump......... 1,000 mL/min (Max)

Outlet Connection.................... ¼’’ Quick Connect, Semi Rigid Tubing

Enclosure Type ....................... NEMA 250 Type 4X, Reinforced Fiberglass

Module Size ............................ 11.2”W, 9.2”H, 6.3”D (285mm W, 234 mm H, 161mm D)

Mounting Holes ....................... 9.7”W x 10.5”H (247mm W x 266mm H)

Weight..................................... 6 Pounds (2.72 kg)

Chemtrac Systems, Inc.

Page 11

SECTION 2.0 MOUNTING AND INSTALLATION

2.1 MOUNTING LOCATION

The sensor can be located several hundred feet from the monitor. The sensor must be
mounted in a vertical position with the sample flowing into the inlet (3/4” barb fitting) and
exiting from the outlet (PVC elbow). Typically, the sensor is mounted as closely as
possible to the sampling point. Minimizing sample line lengths provides quicker
response to process changes. Sample may be obtained by using a sample pump,
tapping off a pressurized line, or using gravity feed system to get sample to the sensor.
The sample flow rate should not exceed 5.0 GPM for Dura-Trac sensor and 10.0 GPM
for Dura-Trac II sensor. Draining to atmosphere (unobstructed) is required; a
closed pipe (pressurized) drain is not recommended.

The Monitor/Controller module should be installed in a location, which will allow regular
viewing of the display as well as easy access to the front panel menu keys. See
Mounting Dimension Diagrams at end of Manual.

2.2 POWER REQUIREMENT

Electrical power should be connected in the following order

R Insert the ground wire into the middle terminal labeled “G”.
R Insert the hot wire into the left terminal labeled “L”.
R Insert the neutral wire into the right terminal labeled “N”.

For safety and proper operation, the monitor must be properly grounded through their
power cord. In cases where potential noise sources could affect the performance of the
equipment, a "surge suppressor" must be installed with the unit. The following drawings
show power terminal connections for models SCM2500XRD and SCC3500XRD
monitors, and Dura-Trac or Dura-Trac II Sensor.

Figures 3 thru 5 illustrate power-wiring connections to Monitor/Controller, Dura-Trac,
and Dura-Trac II Sensors.

FUSE: AGC-1.5A

Chemtrac Systems, Inc.

FUSE

WARNING TURN POWER OFF BEFORE MAKING ANY WIRE CONNECTIONS

TO AVOID DAMAGING THE ELECTRONIC CIRCUIT.

OFF

ON

G

L N

L

N

GND

POWER CORD

SMM | Sensor

*
*

*
*

*

1

432 65

FIELD WIRING TERMINALS

8 9 1311 12 1514 16

7

10

181719 20

FIGURE 3. Monitor/Controller Power Wiring

Page 12

6543

1

2

119 10 1287

Opto (W)

Opto (O)

+24 Vdc

Opto (B)

+ Probe

Vdc Gnd

Cond.

High

- Probe

Shield

Signal

Opto

L1

N

FIGURE 4. Dura-Trac Sensor Power Wiring

543

1

2

6 119 10 1287

Opto (W)

Opto (O)

+24 Vdc

Vdc Gnd

Opto (B)

Cond.

+ Probe

High

- Probe

Shield

Signal

Opto

L1

N

FIGURE 5. Dura-TRAC II Sensor Power Wiring

Chemtrac Systems, Inc.

Page 13

2.3 SIGNAL WIRING

The Dura-Trac and Dura-Trac II Sensors transmit the sensing signal to
Monitor/Controller by a multi conductor wires, see Figure 7 for signal wires
interconnection diagram. Twisted shielded cable should be used. The cable should be
enclosed in conduit for maximum protection against damage or electrical interference.
Do not run cable in same conduit with any other wiring.

R Make sure the monitor’s power switch is turn to off position before making any

signal wiring connections.

FUSE

FUSE: AGC-1.5A

OFF

ON

GL N

WARNING TURN POWER OFF BEFORE MAKING ANY WIRE CONNECTIONS

TO AVOID DAMAGING THE ELECTRONIC CIRCUIT.

1
2
3
4
5
6
7

SMM | Sensor

8

CAUTIONS

1817 19 20

9
10
11
12
13
14
15
16

*
*

*
*

1

32 4

17
18
19

*

8657

920121110

16151413

L

N

GND

(BLACK)

(RED)

(WHITE)

(BLUE)

1
+24 Vdc

Vdc Gnd

Signal +

Signal -

5432
Shield

6 87 9
+ Probe

- Probe

Opto (O)

Opto (B)

10
Opto (W)

(BLACK)

(BROWN)

(RED)

(WHITE)

64 5321 12111087 9

CHEMICAL PUMP

FLUSH VALVE

SAMPLE ISO VALVE

24 VDC COMMON

FIGURE 6. Signal Wires Interconnection Diagram

Chemtrac Systems, Inc.

Page 14

2.4 SAMPLE CONNECTION

Sample shall be connected to the sample cell inlet side. A 3/4" barbed fitting connection
is provided for hose connection. The PVC elbow opposite the inlet is the outlet. The
outlet sample must flow to an open drain (sample receiver). The cell cannot operate
properly if pressurized. Do not replace either fitting with any other type of fitting.

Start treated water sample through the cell at a rate of between 1 to 5 GPM. Make sure
the outlet is free of obstructions. Continuous reliability of the sample flow is essential.
Interruption of the sample flow will result in erroneous readings on the
Monitor/Controller. For Controller model SCC3500XRD operating in AUTO mode, loss
of flow to the Dura-Trac sensor will result in improper coagulant dosing. A suitable flow
alarm is recommended for maximum reliability.

On the SCC3500XRD, the pump control output of the controller must be set in the
MANUAL mode if the sensor is flushed or cleaned or if power to the sensor is
interrupted for any reason. The controller can be placed back in AUTO once power
and sample flow is restored. For system with Dura-Trac with flush with Sensor
Maintenance Module (SMM), during Automatic Flushing cycles, the pump control
output signal is maintained at a constant value (see Flush Menu).

IMPORTANT

PATENTED MADE IN U.S.A.

SAMPLE OUTLET

PVC Drain

Funnel

4" Cup

DURA-TRAC

TM

SAMPLE INLET
3/4" BARB FITTING

FIGURE 7. Dura-TRAC Sensor Sample Connection

Chemtrac Systems, Inc.

2" Line

Page 15

CHEMTRAC

SYSTEMS, INC.

DURA-TRAC II

PATENTED MADE IN U.S.A.

SAMPLE INLET

3/4" BARB FITTING

FIGURE 8. Dura-TRAC II Sensor Sample Connection

2.5 SENSOR FLUSH OPTIONS

The SCM2500XRD and SCC3500XRD are available with one of two options for
automatic sensor flushing/cleaning. The first option is the Dura-Trac with flush and is
composed of a valve mounted onto the Dura-Trac sensor, which is connected to flush
water. The second option is the SMM and is composed of a flush valve, sample
isolation valve, and chemical injection pump. The Dura-Trac with flush is recommended
for Drinking Water applications where high turbidity is often experienced. The SMM is
recommended for Waste Water applications. These options are only supplied if
specified at the time of purchase. The line of monitors offered by Chemtrac® can be
upgraded to include one of these two options. To upgrade to the Dura-Trac with either
options, the Dura-Trac sensor will need to be returned to the factory.

Potable water or the best quality plant water available shall be used for the flush water
supply. If potable water is used for flush water, a backflow prevention device should be
installed on the flush water line to prevent contamination of the potable water source.
The flush water needs to maintain a pressure of 35 PSI min to 80 PSI max.

2.5.1 Dura-Trac with Flush

Connect the male NPT end of the ¼’’ MNPT to ¼’’ Quick Connect Tube adapter fitting
(supplied with the unit) to the flush water supply. Connect a sufficient length of ¼’’
Teflon tubing between the flush water supply (¼’’ Quick Connect Tube adapter fitting)
and the valve’s ¼” quick connect fitting (see Figure 10 on the next page). The flush
valve’s outlet should already be connected to the probe flush assembly. The third valve
outlet (located on the bottom of the valve and pointed towards the ground) is the drain
outlet. Run this outlet to an appropriate drain using ¼’’ semi-rigid tubing. A manual
control valve should be installed on the flush water line in close proximity of the unit so

TM

SAMPLE OUTLET
45 DEGREE ELBOW

4" Cup

2" Line

PVC Drain

Funnel

Chemtrac Systems, Inc.

Page 16

that the flush water may be shut off during sensor maintenance. Do not open flush
water supply valve until all connections have been made.

CHEMTRAC

SYSTEMS, INC.

PATENTED MADE IN U.S.A.

25 PSI

CHECK

VALVE

FIGURE 9. Dura-TRAC Sensor with Flush

2.5.2 Sensor Maintenance Module

Figure 11 show tubing connections between SMM and Dura-Trac II sensor. The semi­rigid Teflon tubing is supplied with the unit.

u Connect an appropriate length of ¼’’ semi-rigid Teflon tubing between the

PINCH VALVE outlet quick connect fitting on the SMM and the PINCH VALVE
assembly quick connect fitting.

DURA-TRAC

TM

FLUSH WATER
CONNECTION
1/8" NPT TO 1/4"
COMPRESSION

FLUSH VALVE

v Connect the male NPT end of the ¼’’ MNPT to ¼’’ Quick Connect Tube adapter

fitting to the flush water supply. Connect a sufficient length of ¼’’ Teflon tubing
between the flush water supply (1/4’’ Quick Connect Tube adapter fitting) and
the SMM’s flush water inlet ¼’’ quick connect fitting. A manual control valve
should be installed on the flush water line in close proximity of the unit so that the
flush water may be shut off during sensor maintenance. Do not open flush water
supply valve until all connections have been made.

w Connect an appropriate length of ¼’’ semi-rigid Teflon tubing between the

PROBE FLUSH outlet quick-connect fitting on the SMM and the PROBE FLUSH
assembly quick connect fitting on the Dura-Trac II Sensor.

x Connect an appropriate length ¼’’ semi-rigid Teflon tubing between the

“Chemical Rinse” PUMP INLET quick connect fitting on the SMM and the
chemical carboy.

Chemtrac Systems, Inc.

Page 17