VALLEY FORGE & BOLT SPC4 406A User manual

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
VALLEY FORGE & BOLT MANUFACTURING COMPANY
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA
Phone: (602) 269 - 5748 • Fax: (602) 269 - 7851
E-mail: [email protected] • Web: www.vfbolts.com
SPC4™ MODEL 406A
LOAD MONITORING
SYSTEM
– Firmware Version 1.0 –
Revision 1.0 User Manual for Valley Forge 406A Unit

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 1 of 21 -
INTRODUCTION TO VALLEY FORGE & BOLT LOAD INDICATING FASTENERS
Founded in 1974, by Ronald Clarke, Valley Forge & Bolt Mfg. Co. continues to maintain core
values as a domestic manufacturer of the highest quality, state-of-the-art fasteners, and services
in a timely and efficient manner. We began our legacy in controlled bolting supplying the mining
industry with an improved design of forged liner bolts. Our capabilities expanded to forging and
machining specialty fasteners and the innovation of our load indicating fasteners. Markets
throughout the world, including, oil and gas, refining, chemical, power, heavy equipment, steel,
and transportation have appreciated our efforts in continuous improvement.
Critical joints in any application require controlled bolting throughout their service life to maintain
performance, enhance safety, simplify maintenance and inspections, and improve uptime.
However, the term is more often applied to installation than to the service life of the bolted joint.
Valley Forge & Bolt’s family of load indicating fasteners makes it possible to monitor bolted joints
after installation and to always know fastener tension, regardless of the service interval.
We are constantly developing new technology to optimize the integrity of the bolted joint. Our
load indicating fasteners, Maxbolt™ and SPC4™, meet ASTM F-2482 standards to measure direct
elongation or tension with an accuracy of +/-5% of minimum yield.
Maxbolt™ and SPC4™ fasteners directly measure fastener tension by built-in gages with the
Maxbolt™ or by local or remote meters with the SPC4™ systems. Any tightening tool – hydraulic
electric or a hand wrench may be used to install the fasteners to achieve even and optimal
fastener load. These load indicating fasteners allow users to measure fastener load during
installation, maintenance intervals or inspections and monitor load while fasteners are in service.
Using the family of SPC4™ Meters, fastener load data is directly visible locally with analog and
digital hand-held meters or transmitted through wired or wirelessly meters to a local or remote
monitoring system. Tightening tool “shut-off” control is also available.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 2 of 21 -

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 3 of 21 -
This device contains FCC ID: 2ADMF-HC06 RF module that complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 4 of 21 -
Table of Contents
1.0.0 Introduction.......................................................................................................................................... 5
1.1.0 Inspection......................................................................................................................................... 5
1.2.0 Included Items................................................................................................................................ 5
1.3.0 Descriptions of the SPC4™ Model 406A Load Monitoring System............................... 6
1.3.1 406A Unit – Top View Descriptions ...................................................................................... 6
1.3.2 406A Unit – Top View Image .................................................................................................. 7
1.3.3 406A Unit – Rear View Descriptions .................................................................................... 8
1.3.4 406A Unit – Rear View Image ................................................................................................ 9
1.3.5 Calibration Gage (CG).............................................................................................................. 10
1.3.6 Brass Bristle Brush (BBB)....................................................................................................... 10
1.3.7 Carrying Case (CC).................................................................................................................... 10
1.3.8 AA Batteries (AA)....................................................................................................................... 11
1.3.9 Helper Tool (HT) ........................................................................................................................ 11
2.0.0 SPC4™ 406A Operation................................................................................................................... 12
2.1.0 Measuring SPC4™ Fastener Load................................................................................................ 12
2.5.0 Low Battery Indication .............................................................................................................. 16
3.0.0 SPC4™ Model 406A Load Monitoring System Specifications............................................ 17
3.1.0 Electrical Specifications............................................................................................................. 17
3.2.0 Environmental Specifications.................................................................................................. 17
3.3.0 Physical Characteristics................................................................................................................... 17
4.0.0 User Maintenance – Recommended Cleaning Procedures ................................................ 18
4.1.0 Cleaning the Probe Sensor ....................................................................................................... 18
4.2.0 Cleaning the Datum Disc on the SPC4™ Fastener ........................................................... 19
4.3.0 Cleaning the Enclosure .............................................................................................................. 19
5.0.0 Troubleshooting............................................................................................................................ 20

SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
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1.0.0 Introduction
The SPC4™ Model 406A Load Monitoring System (SPC4™ System) is designed to measure SPC4™
fastener tension in real-time and display the load data as a percentage of minimum yield on the
406A’s LCD or employ the Bluetooth 2.0 capability for remote clamp load monitoring from a smart
device.. There are several uses for the 406A Load Monitoring System:
1. During fastener installation, the SPC4™ 406A will confirm that the fastener has reached
desired proper clamp load.
2. During a flange installation, the SPC4™ 406A can be used to check how SPC4™ fasteners
react as load is being distributed among the installed fasteners.
3. During maintenance inspections, the SPC4™ 406A can be used to verify load on each
SPC4™ fastener to determine if it needs to be retightened.
The SPC4™ System contains precision electronic devices. Care must be taken in handling all its
components. Abusive handling of these components or devices can render them inoperable
and/or compromise the accuracy of the measured load readings.
All SPC4™ load indicating fasteners have been shipped with protective caps installed over the
datum discs to protect and maintain surface cleanliness. These protective caps must remain on
the datum disc, only to be removed during use of the SPC4™ 406A unit.
Valley Forge & Bolt Manufacturing Company assumes no responsibility for inaccurate loading or
failure of SPC4™ load indicating fasteners as a result of damage to the measuring instrument
caused by improper handling or improper maintenance of datum disc surfaces. With proper care
and use, this system will provide years of reliable operation.
This manual includes critical information on the components, operation, and maintenance of the
SPC4™ System. It is imperative to read this manual carefully and completely familiarize yourself
with the operation of this system before use.
1.1.0 Inspection
When unpacking the SPC4™ System, carefully check each item for damage that may have
occurred during shipment. If anything is damaged or missing contact:
VALLEY FORGE & BOLT MANUFACTURING COMPANY
4410 West Jefferson Street ● Phoenix, AZ 85043 ● USA
Phone: (602) 269 - 5748 ● Fax: (602) 269 - 7851
E-mail: [e-mail] ● Web: www.vfbolts.com
1.2.0 Included Items
1
SPC4™ Model 406A Load Monitoring System (406A unit)
406A unit
1
User’s Manual (this manual)
UM
1
Calibration Gage (0% & 100%)
CG
1
Brass Bristle Brush
BBB
1
Carrying Case
CC
3
AA Batteries
AA
1
Helper Tool
HT

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 6 of 21 -
1.3.0 Descriptions of the SPC4™ Model 406A Load Monitoring System
1.3.1 406A Unit – Top View Descriptions
See Figure 1 - 406A Unit - Top View
1
“LINK” LED
A red light emitting diode (LED) that represents the Bluetooth connection status of the 406A unit.
The LED is off when the Bluetooth function is disabled. The LED blinks red
when Bluetooth is
enabled but not connected to another device. The LED will be continuously red when there is an
active Bluetooth connection to another device.
2
LIQUID CRYSTAL DISPLAY (LCD)
The LCD contains useful information regarding the status of the meter and displays the measured
SPC4™ fastener load as a percentage of minimum yield. The LCD will show the words “BAT” in
the bottom left corner of the LCD when the batteries of the 406A should be changed. A ‘~’ like
symbol will appear in the upper left corner of the LCD when the Bluetooth is enabled.
3
“ON/ OFF” BUTTON
A momentary press (a press followed by a release) will turn the 406A unit on or off (will toggle
the power state of the 406A unit). Use the pad / underside of your finger (a soft surface) to press
the “ON/OFF” button and DO NOT use a sharp object such as the tip of your fingernail or a tool.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 7 of 21 -
1.3.2 406A Unit – Top View Image
Figure 1 - 406A Unit - Top View
1.. - “
LINK
” LED
.2.. - LIQUID CRYSTAL DISPLAY
(LCD)
3.. - “
ON/ OFF
” BUTTON

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 8 of 21 -
1.3.3 406A Unit – Rear View Descriptions
See Figure 2 - 406A - Rear View
4
BATTERY COMPARTMENT
The battery compartment of the 406A contains three AA batteries as well as the means to
calibrate the unit and to enable/disable the Bluetooth.
5
ENCLOSURE SCREWS (x6)
These screws fasten the enclosure top to the enclosure bottom of the 406A unit. These screws
should never be removed as there is zero user serviceable parts inside the enclosure.
6
“OFFSET” ADJUSTMENT
A dial used in calibrating the 406A unit. This dial is used to adjust the calibration offset value and
should be used in conjunction with the 0% end of the calibration gage supplied with this unit.
7
“GAIN” ADJUSTMENT
A dial used in calibrating the 406A unit. This dial is used to adjust the calibration gain value and
should be used in conjunction with the 100% end of the calibration gage supplied with this unit.
8
BLUETOOTH “ON/OFF” SWITCH
The Bluetooth “ON/OFF” switch enables or disables Bluetooth on the 406A unit. The Bluetooth is
enabled when the switch is in the “BT-ON” position. The Bluetooth is disabled when the switch is
in the “BT-OFF” position. To save battery life, disable the Bluetooth when not in use.
9
AA BATTERY CONTACTS
These battery contacts hold the three AA batteries (R6 size) that power the 406A unit. It should
be noted that the battery contacts are designed to be tight to limit contact fatigue over the unit’s
years of service. Use the supplied Helper Tool to assist when installing and removing batteries.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 9 of 21 -
1.3.4 406A Unit – Rear View Image
Figure 2 - 406A - Rear View
..4. –
BATTERY COMPARTMENT
..5.. – ENCLOSURE SCREWS
..6.. – “
OFFSET
” ADJUSTMENT
..7.. – “
GAIN
” ADJUSTMENT
. 8 .. – BLUETOOTH “
ON/ OFF
”
SWITCH
. 9 .. – AA BATTERY CONTACTS

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 10 of 21 -
1.3.5 Calibration Gage (CG)
Figure 3 - Calibration Gage (CG)
The calibration gage (see
Figure 3 -
Calibration Gage
(CG) ) is used to check the calibration of the 406A unit.
When the probe is attached to the end marked
“0%” , the
406A unit will display a load value of “000” ±5% (between
-5% “-005” and +5% “005”).
When the probe is attached to the end marked “100%” ,
the 406A unit will display
a load value of “100” ±5%
(between 95% “095” and 105% “105”).
1.3.6 Brass Bristle Brush (BBB)
Figure 4 - Brass Bristle Brush (BBB)
The brass bristle brush (see
Figure 4 -
Brass Bristle Brush
(BBB) )
is supplied with each unit in the event that a
SPC4™ fastener datum-disk experiences corrosion,
potentially seen in fastener’s installed after several years.
Use the BBB only on the SPC4™ fastener and DO NOT
attempt to use it on any surface of the 406A unit.
1.3.7 Carrying Case (CC)
Figure 5 - Carrying Case (CC)
The carrying case (
see Figure 5 - Carrying Case (CC) )
protects the 406A unit and
kit contents during
transportation on and to the job, or when it is being stored
for later use.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 11 of 21 -
1.3.8 AA Batteries (AA)
Figure 6 – Battery (BAT)
The AA batteries (see
Figure 6 – Battery (BAT) ) are
located inside of the 406A unit. They are D6 sized Alkaline
batteries with a nominal voltage of 1.5V each.
See 2.2.0 406A Battery Replacement
on how to
properly install or remove a 406A battery.
Battery life can be extended by using good practices such
as turning off the Bluetooth when not in use.
We recommend using non-rechargeable AA Lithium
batteries to further extend the battery life of the 406A.
1.3.9 Helper Tool (HT)
Figure 7 - Helper Tool (HT)
The supplied battery helper tool (see
Figure 7 -
Helper
Tool (HT) ) is to be used while installing or removing the
406A batteries.
This tool is very effective at assisting
in the installation
process of the batteries as it
guides the and prevents
damage to the batteries.
The HT should also be used in removing the batteries as
a leverage tool to free the batteries from the contacts.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 12 of 21 -
2.0.0 SPC4™ 406A Operation
Outlined in this section are instructions on how to properly measure the load of an SPC4™ fastener
using the 406A unit along with the operation of the 406A unit including the optional Bluetooth
connection, removing and replacing the batteries, and checking the calibration.
Calibration certificates are supplied for each 406A unit and SPC4™ fastener.
2.1.0 Measuring SPC4™ Fastener Load
[1] Determine if Bluetooth will be used or not before taking measurements. See 2.3.0 Using the
406A Bluetooth if a Bluetooth connection will be used.
[2] Turn on the 406A unit by momentarily pressing the
“ON/OFF” button.
The 406A will begin the boot up sequence by first testing all LCD segments, as seen in
Figure 8
- LCD Boot Up Sequence.
Figure 8 - LCD Boot Up Sequence
After a second, the LCD will display the current firmware version of the 406A as shown in Figure
9 - LCD Firmware Version
.
Figure 9 - LCD Firmware Version
[3] After the boot up is complete, the 406A LCD will start displaying the measurement it is currently
reading. When the 406A is not connected to datum disc the LCD will display “^---” as shown in
Figure 10 - LCD ^--- Measurement .
Figure 10 - LCD ^--- Measurement
[4] At this point, it is recommended to check the calibration of the 406A unit before starting a new
job (review and complete 2.4.0 System Calibration).

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 13 of 21 -
NOTE: When handling the probe, grip it with your hand in the area of the green arrows as
shown in
Figure 11 - Probe Handling - A. It is essential to provide a path for the cable and the
cable grip to move freely without crimping or bending. DO NOT pull or push the cable of the
probe or the cable grip. DO NOT use the cable as a handle to carry the 406A unit and/or the
probe. Repeated deformation of the cable as shown in
Figure 11 - Probe Handling-B will cause
fracture of the wires in the region marked on the drawing (the red sign marked “FRACTURE”)
and render the probe inoperable.
Figure 11 - Probe Handling
[5] Remove the protective cap from the fastener and verify that the datum disc and 406A probe
sensor are clean of any liquid or debris. See 4.0.0 User Maintenance – Recommended
Cleaning Procedures.
[6] Remove the protective cap from the datum disc.
[7] Hold the 406A enclosure in one hand and use the other hand to grasp the attached probe
assembly.
[8] Use uniform pressure to actuate the probe onto the fastener datum disc. The probe assembly will
snap onto the fastener, at this point the probe is self-retaining.
[9] The LCD will now show the measured load (
See Figure 12 - LCD Load Reading Example ) of the
fastener within ±5% as a percentage of the fastener’s minimum yield load. Use the load
certification sheet supplied with the SPC4™ fasteners to correlate this percentage to tension (
see
Figure 13 - SPC4™ Calibration Cert.
). NOTE:Seen below is a 406A measured load of 72% which
correlates to a load approximately 170,000 lbf.
Figure 12 - LCD Load Reading
Example
Figure 13 - SPC4™ Calibration Cert.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 14 of 21 -
[10] Remove the probe from the datum disc by pulling the probe sleeve away from the fastener.
CAUTION: DO NOT USE THE YELLOW CABLE TO PULL THE PROBE OFF THE DATUM
DISC.
[11] Remember to reattach the protective cap over the datum disc! This ensures that the datum disc
is protected from the environment and remains clean for future use.
2.2.0 406A Battery Replacement
[1] Relocate the 406A kit to a clean work bench. Remove the 406A from the kit and place it face
down on a flat surface so that the back is exposed up.
[2] Remove the battery compartment cover to reveal the three AA batteries.
[3] Using one of the helper tools (HT), carefully remove each AA battery by leveraging the battery’s
positive end up. The clips hold onto the batteries tightly so some feel will be required.
[4] Dispose of the old batteries.
[5] Install fresh batteries into the 406A unit, following the positive and negative lead indications. The
battery clips provide a tight fit so that the batteries are held in place during the use of the 406A
unit. The use of the HT may be required to ease the batteries into position.
NOTE:Never mix batches of batteries, especially old and new batteries!
[6] Once the new batteries are installed, confirm that the 406A unit turns on.
[7] Reattach the battery compartment cover.
2.3.0 Using the 406A Bluetooth
[1] Turn the 406A unit over so that the back is accessible. Remove the battery compartment cover.
[2] Locate the Bluetooth
“ON/OFF” switch within the battery compartment as seen in Figure 14 -
ON/OFF Switch Location
.
Figure 14 - ON/OFF Switch Location
[3] Actuate the switch to the “BT
-ON” position. The “LINK” LED will begin to blink and a new symbol
‘~’ will appear on the LCD as seen in
Figure 15 - LCD Bluetooth ON . The Bluetooth switch can be
easily actuated using a HT.
Figure 15 - LCD Bluetooth ON

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 15 of 21 -
[4] Reattach the battery compartment cover.
[6] On a mobile device with Bluetooth capability such as a smart phone or tablet, enable Bluetooth.
[7] Begin searching for Bluetooth devices and find the device named “SPC4_M406A”
[8] Select the device and press pair. Enter the pairing code “4410”. The mobile device and 406A unit
are now paired. NOTE:There is NO change in the
“LINK” LED at this time.
[9] On a mobile device open up a Bluetooth serial monitor of your choosing.
NOTE: A “Bluetooth serial monitor” app can be downloaded onto a smart device via the Appstore.
Valley Forge does not endorse any particular app.
[10] With the Bluetooth serial monitor app open, establish a connection to the SPC4_M406A. Tweak
the Bluetooth data settings to match the Bluetooth settings found in 3.1.0 Electrical
Specifications.
[11] Data can now be monitored remotely from a smart device.
2.4.0 System Calibration
[1] Locate the Calibration Gage. This gage is calibrated at VFB that enables a field check to verify
that the 406A unit is properly calibrated by reading 0% “000” and 100% “100” (within ±5%).
[2] Verify the 406A unit is reading 0% “000” (within ±5%).
1. Turn on the 406A unit.
2. Attach the 406A unit to the supplied calibration gage at the end marked “0%”.
3. Verify that LCD is reading “000” (within ±5%).
Figure 16 - LCD 0%
4. If the LCD is not reading “000” then an adjustment must be made by accessing the
battery compartment.
5. First, remove the protective cover.
6. Adjust the “OFFSET” dial until the LCD reads “000”.
7. Attach and remove the calibration gage several times to ensure the integrity of the
“000” reading which verifies that the 0% measurement has been calibrated correctly.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
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SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 16 of 21 -
[3] Verify the 406A unit is reading 100% “100” (within ±5%).
1. Attach the 406A unit to the supplied calibration gage at the end marked “100%”.
2. Verify that LCD is reading “100” (within ±5%).
Figure 17: LCD 100%
3. If the LCD is not reading “100” then an adjustment must be made by accessing the
battery compartment.
4. First, remove the protective cover.
5. Adjust the “GAIN” dial until the LCD reads “100”.
6. Attach and remove the calibration gage several times to ensure the integrity of the
“100” reading which verifies that the 100% measurement has been calibrated correctly.
[4] It may be necessary to perform the calibration check multiple times.
NOTE: Only adjust the “OFFSET” dial for 0% and the “GAIN” dial for 100%.
2.5.0 Low Battery Indication
If the battery supply voltage drops below approximately 3.1V while the 406A unit is on, the LCD
will display low battery indication in the LCD as shown in
Figure 18 - Low Battery Indication . The
operation of the unit is not affected until the battery supply voltage reaches approximately 2.5V,
but it is recommended to stop operation of the system and change the batteries at 3.1V. If the
supply voltage drops to less than 1.8V, the unit will not turn back on.
Figure 18 - Low Battery Indication

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 17 of 21 -
3.0.0 SPC4™ Model 406A Load Monitoring System Specifications
3.1.0 Electrical Specifications
Input Voltage................................. 4.5 VDC Nominal – 3 x AA (D6) Sized Batteries
Maximum Permissible Range ........... 2.5 VDC to 5.0 VDC
Low Battery Indication.................... Under ≈ 3.1 VDC (or ≈ 1VDC/Cell)
Power Consumption (±5%)............. 2 µA (7.2µW) – Standby (OFF)
(At 20 °C / 68 °F)........................... 20 mA (72mW) – Typical (ON – NO Bluetooth (BT))
................ 75 mA (270mW) – BT ON – Not Connected
........ 50 mA (180mW) – BT ON – Connected
Wireless Frequency ........................ 2.4 GHz
Wireless Protocol............................ Bluetooth Version 2.0 SPP (Serial Port Profile)
Wireless Data Format ..................... Serial, 9600 baud, 8N1
Pairing Code .................................. 4410
Display Type.................................. 3-1/2 Digit Reflective LCD
............................ (12.7 mm / 0.50 in. Digit Height)
Viewing Area (W x H) ..................... 45.7 mm x 17.7 mm / 1.80 x 0.70 in.
Optimum Viewing Angle.................. Six o’ Clock
Measuring Method.......................... 16-Bit A-to-D Conversion and >87 dB 50/60 Hz Rejection
Precision........................................ Equal to or better than ±5% (±2% typical)
3.2.0 Environmental Specifications
Operating Conditions:
Temperature................................................... -10 to 60 °C / 14 to 140 °F
Humidity......................................................... 80% Maximum (Non-condensing)
Storage Conditions:
Temperature................................................... -25 to 70 °C / -13 to 158 °F
Humidity......................................................... 95% Maximum
Ingress Protections Class ................................. IP-54
Note: Any condensing humidity will have negative effects on the readings of the unit.
3.3.0 Physical Characteristics
Dimensions (L x W x H) ................................... 260 x 100 x 33 mm / 10.24 x 3.94 x 1.30 in.
Weight ........................................................... 762 g / 1.68 lbs.

VALLEY FORGE & BOLT MANUFACTURING COMPANY PHONE: (602) 269 - 5748
4410 W. Jefferson St. • Phoenix, AZ 85043 • USA WEB: www.vfbolts.com
SPC4™ SYSTEM • MODEL 406A • USER’S MANUAL Rev. 1.0
- Page 18 of 21 -
4.0.0 User Maintenance – Recommended Cleaning Procedures
UNDER NO CIRCUMSTANCES SHOULD THE PROBE FACE OR THE DATUM DISC
SURFACE BE ABRAIDED.
CAUTION:
1. DO NOT attempt to clean the probe sensor or the datum disc with abrasives or by scraping
it with emery cloth or sandpaper.
2. DO NOT use abrasives, solvents, or aromatic hydrocarbons to clean the 406A unit as damage
may occur to the plastic half of the enclosure. If cleaning is necessary, use only a mild solution
of warm water and detergent.
3. Any attempts to clean the 406A unit should be made in the “OFF” power state while the
enclosure lid is tightened on.
4. DO NOT ATTEMPT TO CLEAN THE INSIDE OF THE ENCLOSURE!
4.1.0 Cleaning the Probe Sensor
[1] Wipe the probe sensor face clean followed by a forced moisture-free air cleaning.
1. ONLY use a clean lint-free dry cotton cloth.
2. The forced air stream can be compressed air delivered through an air nozzle, or a can of
compressed air commonly used in cleaning electronic components and computer equipment.
Figure 19 - Probe Sensor Cleanliness
Dirty or contaminated
probe sensor face
Probe sensor face visually clean using a
clean lint-free dry cotton cloth
[2] Visually inspect the surface has been cleaned from contaminants.
[3] Check the calibration as outlined in 2.4.0 System Calibration.