OleumTech H Series User manual

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TUNING FORK LEVEL SWITCHES - USER GUIDE
OleumTech® H Series Sensors
Tuning Fork Level Switches
HTF1740 / HTF1741
User Guide
Document ID: 80-7091-001_G

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TUNING FORK LEVEL SWITCHES - USER GUIDE
Table of Contents
1. PRODUCT INTRODUCTION ................................................................................. 3
2. SAFETY, CERTIFICATIONS, COMPLIANCE............................................................ 4
3. TECHNICAL SPECIFICATIONS .............................................................................. 7
4. ORDERING INFORMATION ................................................................................. 8
5. DIMENSIONS ...................................................................................................... 9
6. POWER ............................................................................................................. 10
7. WIRING & OPERATION ..................................................................................... 11
8. INSTALLATION BEST PRACTICES ....................................................................... 15
9. MAGNETIC SWITCH WIRING & OPERATION..................................................... 17
10. TROUBLESHOOTING..................................................................................... 19
11. MAINTENANCE............................................................................................. 20
12. LIMITED WARRANTY .................................................................................... 21
13. REVISION HISTORY....................................................................................... 22

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TUNING FORK LEVEL SWITCHES - USER GUIDE
1. PRODUCT INTRODUCTION
1. Working Principle
The piezoelectric component is used to drive the tuning fork and feedback
signal, which produces the resonation on the fork. When the fork comes
into contact with a material, the fork will release some frequency signal as
feedback. It will be converted into the output of the contact signal when
the circuit detects the frequency decrease of the signal.
The product relies on the damping effect by covering the testing material
on the tuning fork which reduces the vibration frequency of the tuning fork
and outputs a switch signal. Therefore, there is no signal amplification
circuit inside, which can eliminate the trouble of frequent sensitivity
adjustment due to the material change.
2. Features
•Contact output option:
oSPDT Relay contact: 3 A / 250 Vac / 250 Vdc
oSSR MOSFET (PNP/NPN): 400 mA / 60 Vac / 60 Vdc
•Wide voltage supply range: 20-250 Vac 50/60Hz, 20-250 Vdc
•Power consumption: 5 VA (AC) or 2.5 W (DC) Max, 120 Vac/30 mA or
24 Vdc/75 mA Normal Operation
•No frequent calibration required, easy-to-use, sturdy and durable
design. High/low alarm mode, safe and reliable.
•Sensitivity adjustment is available for different densities of media. Fine
powder can be detected.
•Suitable for liquid, powder, and solid applications.
•Adjustment setting for different densities of media.
3. Application Scope
It is applicable to the max. and min. level detection of the tanks or tubes
filled with various solid/liquid media. The product has a variety of
applications, such as in the chemical fiber industry, rubber industry, tire
industry, cement industry, steel industry, food industry, pharmaceutical
industry, and animal feed factories in terms of the level detection for the
bins of the raw material/process/finished products.
4. Applicable Materials
The tuning fork level switch can be widely applied to detect the minimum
and maximum levels in tanks, silos, and hoppers filled with materials of
different densities and states.
Common applications
•Water & solutions
•Powders
•General purpose solvent
•Oil
•Heavy oil
•Petroleum

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TUNING FORK LEVEL SWITCHES - USER GUIDE
2. SAFETY, CERTIFICATIONS, COMPLIANCE
1. Safety
CAUTION: Ensure installation of the tuning fork level switch meets
applicable state and National Electrical Code requirements. The installation
of the transmitter should only be performed by a qualified installer or a
factory representative.
WARNING: The tuning fork level switch is powered by an external power
supply. The power supply circuit must comply with the energy-limiting
circuit by relevant standards and pay attention to the high voltage circuits
that may exist.
WARNING: The level switch cover must be fully engaged and secure to
meet Explosion-proof requirements.
WARNING: Using the tuning fork level switch in hazardous areas,
installation, use and maintenance must also comply with the operation
manual and relevant requirements of national standards.
WARNING: Do not remove the level switch cover in an explosive
atmosphere when the circuit is alive.
WARNING: EXPLOSION HAZARD – THIS DEVICE SHALL BE REMOVED
FROM THE AREA KNOWN TO BE HAZARDOUS IF MAINTENANCE IS
REQUIRED.
WARNING: To prevent static discharge, wipe with damp cloth only.
WARNING: Although the switch is very durable, do not install it on high
vibration applications or where the switch is subject to severe mechanical
shock.
WARNING: If the equipment is used in a manner not specified by
OleumTech, the protection provided by the equipment may be impaired.
WARNING: Safety of any system incorporating the transmitter is the
responsibility of the assembler of the system.
CAUTION: All housing entries MUST be tightly SEALED using thread seal
tape or sealant. Failure to seal all port entries may allow moisture to enter
the transmitter housing, cause damage to internal components, and void
warranty.
CAUTION: All housing covers MUST be tightly fastened to protect against
external environmental elements.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
Sécurité
ATTENTION: Assurez-vous que l'installation du commutateur de niveau du
diapason est conforme aux exigences des codes électriques nationaux et
nationaux applicables. L'installation de l'émetteur ne doit être effectuée
que par un installateur qualifié ou un représentant d'usine.
AVERTISSEMENT: l'interrupteur de niveau du diapason est alimenté par
une alimentation externe. Le circuit d'alimentation doit être conforme au
circuit limiteur d'énergie selon les normes pertinentes et faire attention
aux circuits haute tension qui peuvent exister.
AVERTISSEMENT: Le couvercle du commutateur de niveau doit être
complètement engagé et sécurisé pour répondre aux exigences anti-
déflagrantes.
AVERTISSEMENT: L'utilisation du commutateur de niveau du diapason
dans les zones dangereuses, l'installation, l'utilisation et la maintenance
doivent également être conformes au manuel d'utilisation et aux exigences
pertinentes des normes nationales.
AVERTISSEMENT: ne retirez pas le couvercle du commutateur de niveau
dans une atmosphère explosive lorsque le circuit est sous tension.
AVERTISSEMENT: RISQUE D'EXPLOSION - CET APPAREIL DOIT ÊTRE RETIRÉ
DE LA ZONE CONNUE POUR ÊTRE DANGEREUSE SI L'ENTRETIEN EST
NÉCESSAIRE.
AVERTISSEMENT: pour éviter les décharges d'électricité statique, essuyez
uniquement avec un chiffon humide.
AVERTISSEMENT: bien que le commutateur soit très durable, ne l'installez
pas sur des applications à fortes vibrations ou là où le commutateur est
soumis à de graves chocs mécaniques.
AVERTISSEMENT: si l'équipement est utilisé d'une manière non spécifiée
par OleumTech, la protection fournie par l'équipement peut être altérée.
ATTENTION: Toutes les entrées du boîtier DOIVENT être hermétiquement
scellées à l'aide d'un ruban d'étanchéité pour filetage ou d'un produit
d'étanchéité. Le fait de ne pas sceller toutes les entrées des ports peut
permettre à l'humidité de pénétrer dans le boîtier du transmetteur,
endommager les composants internes et annuler la garantie.
ATTENTION: Tous les couvercles de boîtier DOIVENT être fermement
fixés pour se protéger des éléments environnementaux externes.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
2. Certifications
IECEx TUR 19.0037
Ex d IIB T4 or T5 or T6 Gb
Ex tb IIIC T 130 °C or T95 °C or T80 °C Db
Ambient Temperature: Ta = -20 °C to 70 °C

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TUNING FORK LEVEL SWITCHES - USER GUIDE
3. TECHNICAL SPECIFICATIONS
Download Datasheet / Technical Specifications

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TUNING FORK LEVEL SWITCHES - USER GUIDE
4. ORDERING INFORMATION

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TUNING FORK LEVEL SWITCHES - USER GUIDE
5. DIMENSIONS
1. HTF1740 / HTF1741
300 lbs flanged connection dimensions shown below:
All housing entries MUST be tightly SEALED using thread seal tape or
sealant. Failure to seal all port entries may allow moisture to enter the
transmitter housing, cause damage to internal components, and void
warranty.
All housing covers MUST be tightly fastened to protect against external
environmental elements.
Check the housing cover O-ring(s) every time the access cover is removed.
- Apply lubricant if the O-ring is dry.
- Replace the O-ring when it is damaged, discolored, or showing
signs of wear.
- The O-ring should be seated firmly on the bottom of threads
without stretching to fit or without bulging.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
6. POWER
1. Power Supply
Power supply (VAC): 20-250 Vac 50/60 Hz, fail under 18 Vac 50/60Hz
Power supply (VDC): 20-250 Vdc, fail under 18 Vdc
2. Power Consumption
5 VA (AC) Max., 120 Vac/30 mA Normal Operation
2.5 W (DC) Max., 24 Vdc/75 mA Normal Operation
3. Signal Output
Relay Contact (SPDT): 3 A / 250 Vac / 250 Vdc
SSR MOSFET (PNP/NPN): 400 mA / 60 Vac / 60 Vdc
4. LED Indicators
Red: Power Supply
Green On: Normal State
Green Off: Alarm State / Fork Switch Failure

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TUNING FORK LEVEL SWITCHES - USER GUIDE
7. WIRING & OPERATION
1. PCB Layout / Controls
PWR: Power Supply (Red LED, On = Normal, Off = Power failure)
SIGNAL: Output Indication (Green LED, On = Normal, Off = Alarm)
ALARM HIGH MODE: For Overflow Protection
Normal State: The signal LED is on and the relay is energized
(conductive).
Alarm State: The tuning fork switch senses the material and the
signal LED is off and the relay is de-energized (not conductive).
ALARM LOW MODE: For Dry Run Protection
Normal State: The signal LED is on and the relay is energized
(conductive).
Alarm State: When the tuning fork switch no longer senses the
material, the signal LED is off and the relay is de-energized (not
conductive).
SENSITIVITY L: Low Sensitivity
SENSITIVITY H: High Sensitivity
2. Relay Output (HTF174xR Option)
RT1, RT2: Remote-Test
(Short RT1 and RT2 terminals to verify tuning fork operation after
installation)
NC, COM, NO: Relay Output
N-, L+: Power Supply
：Ground Connection
Wiring Recommendation:
Normally Open Signal: Use for level detection
Normally Closed Signal: Use for power failure detection
L H

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TUNING FORK LEVEL SWITCHES - USER GUIDE
3. SSR (PNP/NPN) Output (HTF174xN Option)
RT1, RT2: Remote-Test
(Short RT1 and RT2 terminals to verify tuning fork operation after
installation)
COM, NO: PNP/NPN Output
N-, L+: Power Supply
：Ground Connection

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TUNING FORK LEVEL SWITCHES - USER GUIDE
4. Level Alarm Operation
a. Alarm High Mode (Overflow Protection):
Switch the Alarm mode to High on the PCB.
Normal State:The Green signal LED is on. It indicates that the
tuning fork switch does not sense the material and the relay is
active/energized.
Alarm State: The Green signal LED is off. The tuning fork senses
the material and the relay is not active/de-energized.
Loss of Power: Both LEDs are off and the relay is not active/de-
energized.
b. Alarm Low Mode (Dry Run Protection):
Switch the Alarm mode to Low on the PCB.
Normal State: The Green signal LED is on. The tuning fork switch
senses the material and the relay is active/energized.
Alarm State: The Green signal LED is off. The tuning fork switch
does not sense the material and the relay is not active/de-
energized.
Loss of Power: Both LEDs are off and the relay is not active/de-
energized.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
5. Sensitivity Adjustment
The OleumTech Tuning Forks are shipped calibrated from factory.
Typically, there is no need for any sensitivity adjustment.
OleumTech calibrates all Tuning Forks to water specific gravity (S.G. = 0.58
oz/in3or S.G.=1 g/cm3), at the trigger point located at 0.91” from the tip of
the tuning fork. Typically, hydrocarbon-based media typically found in
O&G fields have S.G that falls within the acceptable tolerances of
calibrated tuning forks and no field adjustment should be needed.
CAUTION: For most applications, the factory default setting meets
requirements and a sensitivity adjustment is not necessary. If an
adjustment is necessary, contact OleumTech Technical Support for
additional instructions.
When required, use a small flathead screwdriver
to rotate the dial clockwise or counterclockwise
to make minor adjustments to sensitivity. The
sensitivity will increase when the dial is rotated
clockwise towards the “H” position. The sensitivity will decrease when the
dial is rotated counterclockwise towards the “L” position. The default
switching point is at .91” (23 mm) from the tip of the tuning fork.
Adjustment Best Practices
If the S.G. of the testing medium is lowerthan that of water, then the
sensitivity of the tuning fork ideally should be increased to bring the
trigger point back down to its optimal position on the tuning fork.
If the S.G. of the testing medium is greater than that of water, then the
sensitivity of the tuning fork ideally should be decreased to bring the
trigger point back up to its optimal position on the tuning fork.
CAUTION: It is strongly recommended to test the trigger point using a
sample of the testing medium and make proper sensitivity adjustment to
ensure optimal performance of the Tuning Fork.
6. Fork Trigger Point
The default testing medium is set for water (S.G.=0.58 oz/in3or S.G.=1
g/cm3), and its default trigger point is about 0.91” (23mm) from the fork
tip.
If the testing medium’s Specific Gravity (S.G.) is lower than
0.58 oz/in3(water), the trigger point will move upward on the tuning fork,
which requires an increase in sensitivity adjustment.
Similarly, the trigger point will move downward if the S.G is greater than
water, which requires a decrease in sensitivity adjustment.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
8. INSTALLATION BEST PRACTICES
1. Horizontal Installation
a. Do not install the tuning fork near the process inlet.
b. Install the device with the wiring ports facing down towards the
ground.
The tuning fork blades will be aligned in the correct orientation as long
as the wiring ports are facing down.
2. Vertical Installation
a. The default switching point is 0.91” (23 mm) from the tip of the tuning
fork.
b. Install the switch in the direction that would allow the medium to
easily pass between the fork blades.
c. Do not install the switch near the process inlet.
0.91” (23

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TUNING FORK LEVEL SWITCHES - USER GUIDE
All housing entries MUST be tightly SEALED using thread seal tape or
sealant. Failure to seal all port entries may allow moisture to enter the
transmitter housing, cause damage to internal components, and void
warranty.
All housing covers MUST be tightly fastened to protect against external
environmental elements.
Check the housing cover O-ring(s) every time the access cover is removed.
- Apply lubricant if the O-ring is dry.
- Replace the O-ring when it is damaged, discolored, or showing
signs of wear.
- The O-ring should be seated firmly on the bottom of threads
without stretching to fit or without bulging.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
9. MAGNETIC SWITCH WIRING & OPERATION
1. Part Number: SX1000-MS1
You can install an SX1000-MS1 Magnetic Switch to the Tuning Fork to easily
verify the operational integrity of the device.
A magnet is required for the switching operation: ≥1100 gauss.
2. Installation
a. Use an available port on the Tuning Fork to install the Magnetic
Switch.
b. Must apply sealant to the threads.
c. Do not connect any wires until the Switch is fully tightened and
secured to the housing.
3. Wiring
a. Connect the Magnetic Switch wires to terminals RT2 and RT1 as
shown. Wiring orientation does not matter.
a
b. Remove the PCB if necessary to facilitate the wiring process that is
secured by two screws.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
4. Operation
a. Under Tuning Fork’s normal operating condition, the green LED is lit
(non-alarm state).
b. To verify the health of the Tuning Fork, you simply make contact with
the Magnetic Switch using a magnet to trigger an alarm state.
A magnet is required for the switching operation: ≥1100 gauss.
a. Good condition: the green LED turns off.
b. Faulty condition: the green LED stays lit.

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TUNING FORK LEVEL SWITCHES - USER GUIDE
10. TROUBLESHOOTING
1. The device won’t power on:
a. Verify that the wiring is correct and the user has used the correct
polarity
b. Verify that the device is being supplied with values that are above
18 Vac/Vdc
2. The device does not trigger:
a. Verify that the sensitivity settings are not too high or too low for your
application
b. Verify that the Product is compatible with the tuning fork
c. Verify the correct Alarm Settings are being used
3. No or incorrect response from Normally Closed/Normally
Open wiring:
a. Verify that the correct terminal port has been wired into. Either NO or
NC depending on your application

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11. MAINTENANCE
1. General
The H Series Tuning Fork Level Switch is easy to maintain and does not
require periodic system checks. The sensor generally only needs a yearly
visual inspection to monitor the following.
•Is the device still securely fastened to the mounting location?
•Are there any visible signs of corrosion, cracks or residue build-up on
the unit?
•Has anything about the intended use of the original application
changed?
If the device is securely fastened, with no signs of corrosion, cracks, or
residue build-up, or nothing has changed about the location of its intended
use, it should continue to operate within designed specifications.
If the device is not securely fastened, there are signs of corrosion,
cracks, residue build-up, or if there has been a change to the location of
its intended use resulting in undesirable performance, contact
the manufacturer for service instructions.
2. Cleaning
a. Cleaning: To prevent static discharge, wipe the outer casing with a
damp cloth only.
b. Please notice the following when cleaning:
•Use a cleaning agent that will not damage the instruments.
3. Recycling/Disposal
Recycling of equipment and package recommended. Dispose of equipment
and packaging in accordance with local and national regulations.