GF Signet 4150 User manual

Signet 4150 Turbidimeter
3-4150.090 Rev F 02/09
*3-4150.090*
Specifications
Measurement Range 0 to 100.0 NTU or 0 to 1000.0 NTU
Accuracy
<40 NTU: ±2% of reading or ±0.02 NTU
whichever is greater
>40 NTU: ±5% of reading
Resolution 0.0001 NTU (below 10 NTU)
Response Time Adjustable
Display Multi-Line LCD with backlighting
Alarm Relays (2) 120-240 VAC, 2A Form C Relay
Analog Output Active 4-20 mA/RS485, 600 Ωdrive
Wetted Materials
• Tubing: Vinyl
• Measuring cuvette: Borosilicate Glass
• Glass washer seal: Silicone
• Pressure regulator: Polypropylene
FPM
316 Stainless Steel
Delrin® by Dupont™
• Inlet tube: 316 Stainless Steel
Maximum Inlet Pressure Recommended 345 kPa (50 PSI)
based on tubing connection
Integral Pressure Regulator Rated 1380 kPa (200 PSI)
Flow Rate 0.1 L/m to 1 L/m
(0.026 GPM to 0.26 GPM)
Operating Temperature 1°C to 50°C (34°F to 122°F)
Sample Temperature Range 1°C-50°C (34°F – 122°F)
Power Supply 100 to 240 VAC, 47 to 63 Hz, 80 VA
Insulation Rating Double Insulated
Pollution Degree 2
Overvoltage Category II
Altitude 2000 meters (6562 ft.) maximum
Relative Humidity Maximum 95% RH non-condensing
Enclosure Rating IP 66 /NEMA 4X
Environmental Conditions Not recommended for outdoor use
Shipping Weight 2.5 kg (5.5 lb)
Regulatory Compliance And Certifications
CE
White Light version Compliant to U.S. EPA 180.1
Infrared version Compliant to ISO 7027
ETL Listed UL 61010-1 and CSA C22.2
No. 61010-1
Chinese RoHS
For detailed information go to www.gfsignet.com
Description
The Signet 4150 Turbidimeter provides accurate and reliable water quality monitoring for municipal and industrial applications.
The 4150 uses the Nephelometric method to calculate the turbidity of a sample as it flows through a viewing chamber. Models are
available that use white light technology as required by the U.S. EPA 180.1 standard, or select the models that use infrared technology
as required by ISO 7027.
Periodic calibration is mandatory with most turbidity systems, and the 4150 makes it fast and easy with sealed, reusable primary
calibration standards.
Two dry contact relays serve as high or low alarms, with programmable setpoints and time-based delays to prevent false alarms.
Additional features include a bright backlight for the display, and a convenient holder for the cuvette during calibration.
An ultrasonic automatic cuvette cleaning system is standard for 0-100 NTU/FNU systems and optional for 0-1000 NTU/FNU systems.
Signet Turbidimeter
ENTER
Power Supply &
Wiring Terminals
NTU=FNU=FTU

2 Signet 4150 Turbidimeter
Unpacking and Inspecting the Instrument and Accessories
The table below indicates the items in the turbidimeter shipment.
Item Quantity
3-4150- ( __ ) Turbidimeter 1
3-4150.090 Instruction Manual 1
3-4150.380 Desiccant Pack (Do not open until ready to install) 1
4150-0009 Measurement Cuvette 1
4150-0005 Tubing Kit:
1 ea. shutoff clamp
1 ea. backpressure valve
2 ea. connecting tubing with fittings for flow through assembly
1
Remove the instrument from the packing carton. Carefully inspect all items to ensure that no visible damage has occurred during
shipment. If the items received do not match the order, please immediately contact the local distributor or the Georg Fischer Signet
Customer Service department.
Dimensions
13.5 in.
7.34 in.
4.0 in.
2.0 in.
8.9 in.
Top View
Front View
Side View
Cuvette
Holder
Measuring
Cell
Safety
This manual contains basic instructions that must be followed
during the commissioning, operation, care and maintenance of
the instrument. The safety protection provided by this equipment
may be impaired if it is commissioned and/or used in a manner
not described in this manual. Consequently, all responsible
personnel must read this manual prior to working with this
instrument.
Disclaimer
Georg Fischer Signet LLC accepts no responsibility for damage
caused by the introduction of vapors, fluids or other materials into
the instrument process stream which is not compatible with the
wetted materials. A list of the wetted materials can be found in the
specifications on page 1 of this manual.
Material Safety Data Sheets (MSDS) are available online at
http://www.gfsignet.com/msds.htm.
It is the responsibility of the Distributor, Dealer, or Agent to
provide a current copy of the MSDS to the Consumers of Georg
Fischer Piping Systems products. The information contained
herein is presented in good faith and has been compiled from
sources believed to be reliable. It represents the best information
currently available to us. No warranty express or implied, or
merchantability, fitness or otherwise is made and we assume no
liability resulting from its use. This information is offered for your
consideration and users should make their own investigation
and verification to determine the suitability of the information for
their particular purposes. In no event shall Georg Fischer Piping
Systems, the parent company or its subsidiaries be liable for any
claims, losses, or damages of any third party or for lost profits
or any special, indirect, incidental, consequential or exemplary
damages, howsoever arising, even if Georg Fischer Piping
Systems has been advised of the possibility of such damages.
This information relates to the material designated and may not
be valid for such material used in combination with any other
materials nor in any process.

3
Signet 4150 Turbidimeter
Installation and Commissioning
Mounting & Site Selection
The 4150 is designed to be wall mounted. All the necessary hardware is included.
• Mount the 4150 within 2-3 meters (6-10 ft) of the sampling point to ensure a
quick response time.
• For ease of service there should be about 20 cm (8 in.) free area above the
instrument for calibration and cuvette maintenance.
• Choose a location that is easily accessible for operation and service.
• The display should be positioned at eye level.
• The overall mounting dimensions of the instrument are shown on page 2.
• Four pan head screws and four wall anchors are provided to mount the wall
bracket.
Plumbing
• Use 4.75 mm (3/16 in.) ID, 8 mm (5/16 in.) OD flexible tubing for the
water supply connections.
• Opaque tubing (not supplied) should be used if the tubing will be
exposed to sunlight, to prevent algae growth.
• The 4150 requires only 1 psi head pressure to operate.
• The flow through cuvette is rated for a flow of 100 mL/m to 1 L/m (0.026-
0.26 GPM).
• The integral pressure regulator is rated for a maximum pressure of 200
PSI. It is factory adjusted. Do not tamper with the regulator.
• Inlet water pressure should not exceed 50 PSI to avoid damage to
the tubing connection to the regulator.
• Fluid temperature must not exceed 50°C (122°F).
• The shutoff clamp is used to interrupt the flow during cuvette
maintenance.
• Route the sensor drain tubing to a suitable drain. Do not reintroduce the
drain sample to the process stream.
Signet Turbidimeter
ENTER
Sensor
Interconnect
Cable
Provide 8 in. clearance
for maintenance.
Water IN
from source
Measuring
Cell
Dessicant access
Water OUT
to Drain
Shutoff
Clamp
Pressure
Regulator
Backpressure
Valve
Drain Vent
DESSICANT COMPARTMENT
OPEN ONLY FOR MAINTENANCE
Adjust the Flow to Eliminate Bubbles
The cuvette must be free of air bubbles to provide accurate measurement. The 4150 provides two tools to make this adjustment.
Open the SHUTOFF CLAMP to allow water to flow through the cuvette.
1. If the flow is gravity-fed, remove the screw that is blocking the DRAIN VENT. This allows for atmospheric equalization and helps to
eliminate bubbles. The vent may leak for a few seconds, until the flow is well established.
2. Adjust the BACKPRESSURE VALVE to prevent air from coming out of solution, which may be observed as tiny air bubbles in the
cuvette:
• Remove the measuring cuvette from the measuring cell and place it in the cuvette holder so it is visible while making these
adjustments.
• If bubbles are visible inside the cuvette, turn the BACKPRESSURE VALVE until the bubbles disappear.
Backpressure
Valve
Shutoff
Clamp
Backpressure
Valve
Drain vent
To Drain
DESSICANT COMPARTMENT
OPEN ONLY FOR MAINTENANCE
Pressure
Regulator
The Inlet pressure
regulator is factory
set. Do not adjust!
Contact the factory
if inlet pressure
will exceed 50 PSI!
A modified tubing
connection may be
required.

4 Signet 4150 Turbidimeter
Electrical Connections
All of the electrical connections to the 4150 are made inside the
power supply, located to the right of the display.
The connections are labeled within the terminal box and are self-
descriptive.
Follow all local and government recommendations and methods
for installation of electrical connections to and between the
instrument and other peripheral devices.
An external grounding terminal is provided for use in the most
extreme electrical noise environments. It is not required for most
installations.
This instrument requires AC voltages that can injure or kill.
Wiring should be done by qualified personnel only.
WARNING
Normally Closed
Normally Open
Common
Relay
Coil
4150 Internal Power
V+
V-
External
Power
Supply
Normal Condition
Normally Closed
Normally Open
Common
4150 Internal Power
V+
V-
External
Power
Supply
Alarm Condition
or Power Failure
Relay
Coil
NC
COM
NO NC
COM
NO
ALARM2 ALARM1
4-20 mA
RS-485
+-
AB
Removable
Terminals
AC Cable
Restraint
GL1 L2
115/230 VAC
Ground
90-250 VAC
47-63 Hz
}
Power
• Install a circuit breaker in the AC line before the 4150 power
connection to allow for service.
• The 4150 is not supplied with a power cord.
• The power cable bulkhead will accept cable diameters from
5.8 mm (.230 in.) up to 10 mm (.395 in.).
• All terminals are designed to accept wires in the range of 14-
28 AWG.
• All wires should be stripped to a length of 6 mm (¼ in.).
• A strain relief strap is provided to reduce tension on the AC
power terminals.
RS-485
• The RS-485 half-duplex (2-wire) digital interface operates
with differential levels that are not susceptible to electrical
interferences.
• The last device on each bus may require terminating with a
120-ohm resistor to eliminate signal reflection on the line.
• Do not run RS-485 cables in the same conduit as power.
Relays
Both Alarm relays are configured for fail-safe operation.
The normal condition is with power applied to the 4150 and in a non-alarm condition.
• The relays are rated for 2 A maximum.
• If power is removed from the 4150, the relays will be in an alarm state.
4-20 mA
• The active 4-20 mA output is driven by a 15 VDC power
source and can drive external loads up to 600 ohms.
• Do not run 4-20 mA cables in the same conduit as power.
Attach a wire to the small spade lug and connect the housing to a
local Earth ground if necessary.

5
Signet 4150 Turbidimeter
The Display
All of the elements on the LCD are identified here:
The Keypad
4 keys are used to set up, calibrate and operate the 4150.
Signet Turbidimeter
Turbidity Measurement
Security Indicator
Offset Indicator
Alarm Indicators
Drying Period
Calibrate Menu
Options Menu
Units display
Error Messages
ENTER
ENTER Key
Press to access menus
Press to save changes
UP, DOWN keys
Scroll through Menu options
RIGHT key
Select item or character to edit
During normal operation, the instrument will have the Units selection displayed on the lower row of the
display and the measured reading on the upper row of the display.
The instrument is equipped with a security access code to protect the instrument settings from
inadvertent modification.
If the CODE feature is enabled in the OPTIONS menu, the KEY icon is displayed.
If OFFSET is displayed, the 4150 output has been adjusted to match an external reference
measurement.
The ALM1 and ALM2 icons are displayed if the 4150 measurement has exceeded a HIGH or LOW
alarm setpoint.
DRY indicates that the 4150 is in a drying period, following the replacement of the cuvette. The internal
fan will circulate air to clear condensation from the cuvette.
NOTE: DRY is not an alarm condition. During a DRY period the ultrasonic cleaning system is disabled,
but the instrument is still operating.
CAL is displayed when the 4150 is being calibrated.
• The alarm relays are held in their NORMAL condition when CAL is displayed.
• The 4150 will return to normal operation if no keys are pressed in the CAL menu for 6 minutes.
OPTIONS is displayed when the 4150 is being configured.
• The alarm relays are held in their NORMAL condition when OPTIONS is displayed.
• The 4150 will return to normal operation if no keys are pressed in the OPTIONS menu for 10
minutes.
Display Icons and Functions

6 Signet 4150 Turbidimeter
Security Access Feature
If CODE is enabled in the OPTIONS menu, the Access code (▲-▲-▲-▼) must be entered to gain access to CAL or OPTIONS menus.
• Press and hold the ►key for 2 seconds to access the CALIBRATE menu.
• Press and hold the ►key for 5 seconds to access the OPTIONS menu.
Signet Turbidimeter
ENTER
5s
ENTER
ENTER
ENTER
ENTER
Signet Turbidimeter
ENTER
2s
ENTER
ENTER
ENTER
ENTER
100 NTU Calibration for
4150-3, 4150-4 Only
1. Press the ▲key 1. Press the ▲key
2. Press the ▲key 2. Press the ▲key
3. Press the ▲key
3. Press the ▲key
4. Press the ▼key
4. Press the ▼key
5. Press the ▲and ▼keys to select the NTU standard value
needed.
Alarm relay contacts are held at the last valid condition while the
instrument is in the CALIBRATE or in the OPTIONS menu.
While in the CALIBRATE menu, the instrument has a time-out
feature that automatically returns the system to normal operation
if no keys are pressed for 6 minutes.
CALIBRATE
The 4150 is calibrated and tested prior to leaving the factory, and
is ready to use directly out of the box.
The EPA recommends that on-line turbidity systems be calibrated
at least once every three months if they are used for EPA
reporting.
The 4150 is designed to recognize the specific NTU values of
certifed calibration standards to make periodic recalibration very
safe, quick and simple. The CALIBRATE menu is dedicated to
this method of calibration.
The OFFSET function found in the OPTIONS menu allows a
single-point alignment with an external measurement device.
OFFSET is not a substitute for calibration, but it may be useful if
standard solutions are not readily available.
5. Press the ▲and ▼keys to select the OPTIONS function that
will be modified.
While in the OPTIONS menu, the instrument has a time-out
feature that automatically returns the system to normal operation
if no keys are pressed for 10 minutes.
Access to CALIBRATE Menu Access to OPTIONS Menu
Output Options:
Select the 4-20 mA output or the RS485
Digital output.
Extended Options:
Display many single-set options like
brightness and decimal location.
(See OPTIONS: EXTENDED, pg 11)
Code option:
Turn the Access Code ON or OFF.
Offset option:
Turn the OFFSET option ON or OFF.
Alarm 1 Option:
Turn on the 1st ALARM RELAY.
Alarm 2 Option:
Turn on the 2nd ALARM RELAY.
ALM RELAY
is now LOCKED
ALM RELAY
is now LOCKED

7
Signet 4150 Turbidimeter
Calibration Procedure
1. Access the Calibrate menu by pressing the ENTER key for 2 seconds.
2. Enter the access security code if necessary. (See pg. 6)
CAL will be illuminated on the display.
The upper display will show the measured NTU value.
The lower display will alternate the value of the first NTU standard and
3. Remove the measuring cuvette and place it in the cuvette holder.
If the Signet 4150 will be used over the entire range, a 3-point calibration is required. Calibration standard kits include three cuvettes
and three different turbidity solutions.
• For 4150-3 (range 0-100 NTU): P/N 3822-4001 (code 159 001 585) calibration kit, turbidity, 100, 10 & 0.02 NTU
• For 4150-1 and -5 (range 0-1000 NTU): P/N 3822-4003 (code 159 001 586) calibration kit, turbidity, 1000, 10 & 0.02 NTU
• A Formazin stock solution kit is also available (P/N 3822-4002). Formazin is very unstable, so it is important to ensure that a
fresh stock suspension of Formazin is used to achieve the accuracy quoted for the instrument. The primary calibration standards
are much more stable than Formazin and have a shelf life of 12 months.
• If the application is limited to measurements below 10 NTU, such as potable water, a 2-point calibration may be performed using
only a 10 NTU and a 0.02 NTU standard.
• New calibration standard cuvettes should be indexed to the specific instrument before being used the first time. See pg. 14.
IMPORTANT! Calibration does NOT remove OFFSET values.
ALWAYS turn the OFFSET function OFF (Options menu) before performing a full calibration.
Calibration Standards
Calibration Tips
• Keep the measurement cell covered as much as possible during the calibration period.
• Replace the cuvette immediately after the calibration to prevent accelerated saturation of the desiccant.
• During calibration, the fan is turned off to extend the life of the desiccant.
• The fan will be turned on during calibration countdowns and after returning to the AUTO mode or after five minutes, which ever
comes first.
10 NTU
10 NTU
Signet Turbidimeter
ENTER
Signet Turbidimeter
ENTER
CAUTION!
Do not touch the glass surface of the cuvette!
Substances on the surface of the glass
will cause errors in the measurement.
Do not remove the glass cuvette from the cap while
holding the assembly over the measuring cell.
Do not allow any debris to fall into the measuring cell.
Do not leave the measuring cell open longer than
necessary. Extended exposure to the atmosphere may
shorten the effective life of the desiccant.

8 Signet 4150 Turbidimeter
Calibration Error
If the 4150 displays Error after calibration, the calibration standards were out of calibration range, or the standard did not match the
NTU value being requested by the 4150. The instrument cannot be used until the error is resolved.
1. Check the standards and recalibrate:
Press and hold the ENTER key for 2 seconds and start the calibration sequence again.
2. Restore the factory calibration:
• Press and hold the ▲key and the ►key for about 2 seconds.
Signet Turbidimeter
ENTER
Signet Turbidimeter
ENTER
Signet Turbidimeter
ENTER
Signet Turbidimeter
ENTER
5. Insert the 10 NTU Standard cuvette.
• Press the ►key. The 4150 will begin the calibration process. The upper display will count down the progress.
When the process is complete, the upper display shows the new NTU value, while the lower display alternates the value of the NTU
standard and
6. Insert the 0.02 NTU Standard cuvette.
• Press the ►key. The 4150 will begin the calibration process. The upper display will count down the progress.
When the process is complete, the upper display shows the new NTU value, while the lower display alternates the value of the NTU
standard and
• Press the ▼key. The lower display will show the next NTU Standard value and
When calibration is complete, press the ▲and ▼keys
together to exit the CAL menu and return to normal operation.
Signet Turbidimeter
ENTER
Signet Turbidimeter
ENTER
4. Insert the Standard cuvette requested by the 4150.
The first NTU standard requested will be either 1000 or 100, depending on the range of the 4150.
If the application will be limited to low Turbidity values (less than 10 NTU), press the ▼key to go to the 10 NTU calibration.
• Press the ►key. The 4150 will begin the calibration process. The upper display will count down the progress.
When the process is complete, the upper display shows the new NTU value, while the lower display alternates the value of the NTU
standard and
• Press the ▼key. The lower display will show the next NTU Standard value and
IMPORTANT!
This action will reset all of the CALIBRATE and OPTION
menus back to factory settings.

9
Signet 4150 Turbidimeter
Instrument Offset
The OFFSET function allows the 4150 to be calibrated to match a process grab sample. This procedure is not recommended in lieu of
regular instrument calibration. This function is only useful at turbidity levels in the immediate vicinity of the grab sample and not in the
full range of the instrument. The OFFSET icon is illuminated whenever an offset is applied.
The maximum offset is ± 1.00 NTU. If the 4150 varies from the sample by more than 1 NTU a full calibration is required.
IMPORTANT! Offset values will remain in the memory even after a complete calibration.
ALWAYS turn the OFFSET function OFF (Options menu) before performing a full calibration.
1. Insert a cuvette filled with the sample water and record the turbidity reported by the 4150.
2. Measure the turbidity of the sample using a laboratory turbidimeter.
3. Compare the turbidity reported by the 4150 to that obtained in the laboratory. Subtract the Lab value from the 4150 value.
8. If the OFFSET value is a POSITIVE number, press the ▲key to scroll to a
positive offset value.
Press the ▲and ▼keys simultaneously to exit the OPTIONS menu and return to normal operation.
Example:
Laboratory sample measures 4.20 NTU, while the 4150 reads 4.50 NTU, or 0.3 NTU high. The OFFSET needs to be set to -0.3
4. Press and hold the ENTER key until OPTIONS is illuminated on the display.
5. Push the ▼key until OFST is displayed on the lower row.
6. If the upper display says ON, go to step 7.
If the upper display says OFF:
• Press the ►key and then ▼to turn the OFFSET function ON.
• Press the ENTER key to save the change.
• Press the ▼key to display the OFFSET value in the upper display.
7. Press the ►key. The upper display will begin blinking.
If the OFFSET value is a NEGATIVE number, press the ▼key to scroll to a
negative offset value.
9. Press the ENTER key to save the changes.
Scroll UP for positive
Offset.
Scroll DOWN for
negative Offset.

10 Signet 4150 Turbidimeter
Options menu
OPTIONS: Output (O/P)
1. The lower display should show O/P. If it does not, Push the ▼
key until the lower display shows O/P.
2. Press the ►key. The upper display will begin blinking.
3. Press the ▲or ▼keys to scroll to the 4-20 mA output or the
RS485 Output.
4. Press the ENTER key to save the selection.
5. See instructions for 4-20 mA settings below.
6. See instructions for configuring the RS-485 port below.
Setting the 4-20 mA Output
1. Press the ▼key. The lower display shows LOLM (Low Limit).
2. Press the ►key. The upper display will begin blinking.
3. Press the ▲and ▼keys to scroll to the NTU value at 4 mA.
4. Press the ENTER key to save the setting.
5. Press the ▼key. The lower display shows UPLM (Upper
Limit).
6. Press the ▲and ▼keys to scroll to the NTU value at 20 mA.
7. Press the ENTER key to save the setting.
Press the ▲and ▼keys simultaneously to exit the OPTIONS
menu and return to normal operation.
Configuring the RS–485 Port Output
1. Press the ▼key. The lower display shows BAUD.
2. Press the ►key. The upper display will begin blinking.
3. Press the ▲and ▼keys to scroll to the baud rate required
(1200, 2400, 4800, 9600, or 19200)
4. Press the ENTER key to save the setting.
5. Press the ▼key. The lower display shows ADDR (Address).
6. Press the ►key. The upper display will begin blinking.
7. Press the ▲and ▼keys to scroll to the correct address.
Address options are from 1 to 255.
Press the ENTER key to save the setting.
8. Press the ▼key. The lower display shows MBUS.
9. Press the ►key. The upper display will begin blinking.
10. Press the ▲and ▼keys to select ASCII or RTU.
Press the ENTER key to save the setting.
Press the ▲and ▼keys simultaneously to exit the OPTIONS
menu and return to normal operation.
The OPTIONS menu contains settings that are generally set once
then rarely changed. The factory setting for all the items in the
OPTIONS menu is OFF. When an option is turned ON, settings
related to that option will appear in the menu. Signet Turbidimeter
ENTER
5
s
Output Options:
Select the 4-20 mA output or
the RS485 Digital output.
Extended Options:
Enable access to performance and
setup options like brightness and
decimal location.
(See OPTIONS: EXTENDED, pg 11)
Code option:
Turn the Access Code ON or OFF.
Offset option:
Turn the OFFSET option ON or OFF.
Alarm 1 Option:
Turn ALARM RELAY 1 ON or OFF.
Alarm 2 Option:
Turn ALARM RELAY 2 ON or OFF.
ENTER
ENTER
Press and hold the ENTER key until
OPTIONS is illuminated on the display.
Enter the ACCESS CODE if the key is
displayed.
Section 7.2
Section 7.3