Hach Surface Scatter 7 User manual

DOC273.53.80483
Surface Scatter® 7 Auto Flush Kit
General information
In no event will the manufacturer be liable for direct, indirect, special, incidental or
consequential damages resulting from any defect or omission in this manual. The
manufacturer reserves the right to make changes in this manual and the products it
describes at any time, without notice or obligation. Revised editions are found on the
manufacturer’s website.
Safety information
NOTICE
The manufacturer is not responsible for any damages due to misapplication or misuse of this
product including, without limitation, direct, incidental and consequential damages, and disclaims
such damages to the full extent permitted under applicable law. The user is solely responsible to
identify critical application risks and install appropriate mechanisms to protect processes during a
possible equipment malfunction.
Please read this entire manual before unpacking, setting up or operating this equipment.
Pay attention to all danger and caution statements. Failure to do so could result in serious
injury to the operator or damage to the equipment.
Make sure that the protection provided by this equipment is not impaired. Do not use or
install this equipment in any manner other than that specified in this manual.
Use of hazard information
DANGER
Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death
or serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury.
NOTICE
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that
requires special emphasis.
1

Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed. A symbol on the instrument is referenced in the
manual with a precautionary statement.
This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.
This symbol indicates that a risk of electrical shock and/or electrocution exists.
Electrical equipment marked with this symbol may not be disposed of in European domestic or public disposal
systems. Return old or end-of-life equipment to the manufacturer for disposal at no charge to the user.
Specifications
Specifications are subject to change without notice. Table 1 shows the specifications for
the solenoid valves in the kit.
Table 1 Solenoid valves
Specification Details
Enclosure NEMA 4
Wetted materials Viton, CPVC and Teflon
Weight 2.44 kg (5.38 lb)
Power requirements 4669212: 120 VAC, 60 Hz, 3 A maximum
4669222: 230 VAC, 50 Hz, 3 A maximum
Pipe connections ¾-inch NPT
Water temperature 93 °C (200 °F) maximum
Water flow rate 30.3 lpm (8 gpm) maximum
Water pressure 3.45 bar (50 psi) maximum
Product overview
This auto flush kit is used with the Surface Scatter® 7 turbidimeter to remove sediment
material from the bottom of the bubble trap/head regulator. This auto flush kit is
connected to an sc200 controller for relay controlled operation.
Product components
Make sure that all components have been received. Refer to Figure 1. If any items are
missing or damaged, contact the manufacturer or a sales representative immediately.
2

Figure 1 Product components
1 Solenoid valves, 3-way, with fittings for glued connections
(2x)
3 Flow control valves, ½-inch NPT PVC (2x)
2 Replacement fittings for threaded pipe connections (6x) 4 Reducer bushings, ¾-inch MPT x ½-inch FPT (3x)
Installation
DANGER
Multiple hazards. Only qualified personnel must conduct the tasks described in this
section of the document.
Wall mounting
Attach the solenoid valves to a flat, vertical surface. The valve orientation is not important.
Make sure that the valve mounting is sufficient to hold the weight of the solenoid valves.
Install the solenoid valves in a location where there is sufficient space to make
connections.
3

Connect to a relay
DANGER
Electrocution hazard. Always remove power to the instrument before making electrical
connections.
DANGER
Fire hazard. Do not daisy-chain the common relay connections or jumper wire from the
mains power connection inside the instrument.
DANGER
Electrocution hazard. In order to maintain the NEMA/IP environmental ratings of the
enclosure, use only conduit fittings and cable glands rated for at least NEMA 4X/IP66 to
route cables in to the instrument.
Connect equipment in accordance with national, state and local electrical codes.
Items to collect:
• 18–12 AWG wire (as determined by the load application)*
• Cable strain relief fitting (cable gland)
1. Remove power to the sc controller.
2. Connect the solenoid valves to an sc controller relay (Relay A, B, C or D). Refer to
Figure 2. Refer to the sc controller documentation for wiring instructions.
3. Connect Terminal 1 in each solenoid valve to the neutral line of a 115/230 VAC
power source. Refer to Figure 2.
4. Connect the power line of the 115/230 VAC power source to the COM (common)
terminal of the sc controller relay.
5. Assemble the sc controller enclosure. Refer to the sc controller documentation.
6. Supply power to the sc controller.
*Wire gauge less than 18 AWG is not recommended.
4

Figure 2 Wiring overview
1 Solenoid valve for cooling water/flush water inlet 4 Neutral line (–)
2 sc200 controller 5 Solenoid valve for sample inlet
3 Power line (+)
5

Plumbing
Make the plumbing connections that are shown in Figure 3. The pipe, adapters and tee
fittings are supplied by the user.
Notes:
• The valve location and orientation is not important. Figure 3 shows an example
installation.
• The flow control valve fittings are ½-inch NPT.
• The solenoid valve fittings are ¾-inch NPT. Install the supplied reducer bushings on
the solenoid valve fittings to connect ½-inch NPT pipe.
• If the sample temperature is more than 50° C (122° F), use CPVC or other heat
resistant material (e.g., PVC pipe or flexible polypropylene) for all plumbing
connections made on the sample line to the solenoid valve.
• Make sure to use pipe materials with a resistance rating that is sufficient for the
sample.
6

Figure 3 Plumbing connections
1 Cooling water/Flush water inlet 8 Outlet to turbidimeter
2 Heat exchanger 9 Flow control valve, ½-inch NPT PVC
3 Cooling water/Flush water to drain 10 Sample to turbidimeter
4 Solenoid valve for cooling water/flush water inlet 11 Sample inlet
5 Bubble trap 12 Sample to drain
6 Cooling water/Flush water to turbidimeter 13 Solenoid valve for sample inlet
7 Outlet to drain
Table 2 Flow pathway legend
A. Sample to turbidimeter (normal flow) D. Cooling water/Flush water to turbidimeter (flush flow)
B. Sample to drain (flush flow) E. Bubble trap water to drain
C. Cooling water/Flush water flow to drain (normal flow)
7

Configuration
Set the flush frequency and cycle time
Configure the sc controller to close the NO (normally open) contact of the relay on a
schedule.
When the NO (normally open) relay contact closes, power is supplied to the solenoid
valves and the water flow direction changes from normal flow to flush flow. Refer to
Figure 3 on page 7 for the normal flow pathway and the flush flow pathway.
Note: The correct flush cycle time and flush interval are dependent on the application conditions.
More frequent flushing is necessary for processes with high concentrations of solids or other fouling
material.
1. Push MENU.
2. Select sc200 Setup>Relay Setup.
3. Select the relay that is connected to the two solenoid valves (Relay A, B, C or D).
4. Select Source>sc200>Set Function>Scheduler to configure the NO relay contact to
close on a schedule.
5. Set the controller to hold the last measured turbidity value on the analog outputs
when the NO relay contact is closed as follows:
a. Select Set Transfer>Inactive.
b. Select Fail Safe>No.
c. Select Activation.
d. Select Hold Outputs>Set Outmode>Hold Outputs.
e. Select Set Channels>None. The measured value will be transmitted on a
4–20 mA loop.
6. Push BACK.
7. Select and configure each option to set the flush frequency and the cycle time.
Use the arrow keys to change a setting. Push BACK to select a different option.
Option Description
Run days Sets the weekday(s) that an auto flush is done. Make sure that the date and time
are correct on the sc controller.
Start time Sets the start time for an auto flush (24-hour format).
Interval Sets the time between auto flushes (0–999 minutes). Refer to Figure 4.
Duration Sets the amount of time of auto flush cycle (0–999 seconds). Refer to Figure 4.
Off delay Sets the time for additional hold/output time after the auto flush. Set to 0 seconds.
Refer to Figure 4.
8

Figure 4 Relay function
1 Duration 3 Interval
2 Off delay 4 Time (x-axis)
Set the flow rate
1. Push MENU.
2. Select Test/Maint>Test Relay>Energize to do a flush.
3. Slowly open the flow control valve to set the flow rate for the auto flush. Refer to
Figure 3 on page 7.
Make sure that the flow rate is sufficient to remove sediment but does not cause
water to come out of the turbidimeter.
4. When the flow rate is correct, select De-energize to stop the flush.
Replacement parts
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate
distributor or refer to the company website for contact information.
Description Item no.
Solenoid valve, 3-way, 120 VAC 2628400
Solenoid valve, 3-way, 230 VAC 2628402
Flow control valve, ½-inch NPT PVC 4668800
Reducer bushing, ¾-inch MPT x ½-inch FPT 4698400
9

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© Hach Company/Hach Lange GmbH, 2014. All rights reserved. Printed in U.S.A. 06/2014, Edition 1