Hardwired Instrumentation
OleumTech Hardwired Sensors and Switches
TUNING FORK LEVEL SWITCHES
High or Low Point Level Detection Solutions
HTF1740 | HTF1741 | HTF1742
HIGHLIGHTS
- Ideal for monitoring high or low level conditions of
liquids, fine grained solids, and powders - Unaffected by turbulence, flow,
foam/bubbles, vibration, liquid properties,
product variations, coating products,
and solids content - Fork material: 316 or 316L stainless steel
- Process temperature:
HTF1740/1741: -40 to 130 °C (-40 to 266 °F)
HTF1742: -40 to 150 °C (-40 to 302 °F) - Max pressure: 2900 PSI (200 BAR)
- HTF1740/1741: 5” to 118” length option in 1” increments
- HTF1742: 2” to 60” length option in 1” increments
- Signal Output:
HTF1740/1741: Relay SPDT/Single Pole Double Throw (NO and NC)
HTF1742: Dual Relay SPDT (NO and NC) - SSR MOSFET (PNP/NPN) option available on HTF1740/1741
- Fitting options: NPT, BSP, 150 and 300 lbs
- Selectable alarm high or low option
- Sensitivity adjustment option (HTF1740/1741)
- Debounce delay option (HTF1742)
- Support for wide power supply range
- NEMA 4X, IP66, Explosion-Proof
- Magnetic Switch Kit available to verify operation, 1/2″ NPT Direct-Mount (Available for HTF1740/1741)
- HTF1742 provides a built-in relay function tester
Low Maintenance, High Reliability
The Tuning Fork Level Switches by OleumTech are part of the H Series line of high quality instruments delivering unrivaled performance, reliability, and accuracy in the most demanding environments, including hazardous locations.
These instruments are designed based on the tuning fork principle for providing point level detection for alarm, monitoring, and control applications. When in air, the tuning fork vibrates at its natural frequency, but when immersed in a particular medium, the frequency drops and provides an output state change.
The H Series Tuning Forks provide exceptional performance for overflow (high) or dry run (low) detection of liquids such as oil, petroleum, corrosive liquid, and water as well as many other mediums such as powders, granular plastics, and gravel. You can select the alarm mode to high or low level detection on the device.
Tuning Fork Switch Designed for Hazardous Locations
The OleumTech Tuning Fork Level Switches provide local LED indication for facilitating the installation process and running diagnostics: dedicated LEDs for both power and alarm indication.
The HTF1740/1741 Tuning Forks provide adjustable sensitivity controls. The default setting is set to high (max), with the switching point set at 0.6” (15 mm) from the top of the tuning fork. The adjustment dial provides an approximate 2.4” (60 mm) of range. The HTF1742 offers two selectable sensitivity options.
The H Series Tuning Forks are Explosion-Proof, certified for use in hazardous locations. The HTF1740 can be ordered from 5” to 12″ range from the thread to the tip of the fork while the HTF1741 is offered from 13” to 118” option in 1” increments. The HTF1742 is offered in 2″ to 60″ probe lengths in 1″ increments.
Applications:
Point Level Detection for Gas Scrubbers
TECHNICAL SPECIFICATIONS
| HARDWARE FEATURES | HTF1740/1741 |
|---|---|
| Device Functionality | ∙ Point Level Detection Switch using Vibrating Tuning Fork Technology |
| Interface | ∙ Relay (Normally Open and Normally Closed) or SSR MOSFET (PNP/NPN) |
| MECHANICAL SPECIFICATIONS | |
| Dimensions (Head) | ∙ 4.45" (W) x 4.25" (H) x 4.45" (D) / 113 mm (W) x 108 mm (H) x 113 mm (D) |
| Tuning Fork Length (Thread to Tip) | ∙ HTF1740: 5" to 12" (127-305 mm) / HTF1741: 13" to 118" (330 to 3000 mm) |
| Package Dimensions | ∙ 18" Length: 20.1" (W) x 6.7" (H) x 6.7" (D) / 51 cm (W) x 17 cm (H) x 17 cm (D) |
| Package Weight | ∙ 18" Length: 8 lbs. / 3.6 kg, Please Ask an OleumTech Sales Representative for More Information |
| Ports | ∙ Two 1/2" NPT |
| Connection Fitting (Standard) | ∙ 1" NPT |
| Connection Fitting Options | ∙ NPT, BSP, 150 lbs, 300 lbs (1", 1.25", 1.5", 2", 2.5", 3", 4", 5", 6") |
| Enclosure Casing Material | ∙ Type 4X Aluminum; IP66 |
| Fork Trigger Point | ∙ Default: 0.91" (23 mm) From Tip of the Fork (Maximum Sensitivity: 0.59" (15 mm) From Tip of the Fork) |
| Tuning Fork Material | ∙ Stainless Steel 316 or 316L Option |
| Max. Vertical Load on Rod. | ∙ 177 in/lb (20 Nm) |
| Process Pressure | ∙ 2900 PSI (200 BAR) Max |
| Min. Material Density Sensed | ∙ Solid: ≥0.04 oz/in3 (0.07g/cm3), Liquid: ≥0.04 oz/in3 (0.7g/cm3), Viscosity: 1~10000 cst |
| Time Delay (Debounce) | ∙ 0.6 Second / Operation: 1-3 Seconds / Reset |
| Vibrating Frequency | ∙ 350-370 Hz |
| Selectable Alarm Mode | ∙ High (Overflow) or Low (Dry Run) |
| Selectable Sensitivity | ∙ Low to High (Closer to Tip of the Fork) |
| LED Status Indicators | ∙ Red (Power): On = Normal, Off = Power Failure; Green (Signal): On = Normal State, Off = Alarm State |
| Fork Operation Test Points | ∙ Short RT1 and RT2 Wiring Terminals to Test Tuning Fork Operation |
| ELECTRICAL SPECIFICATIONS | |
| Signal Output | ∙ Relay Contact (SPDT): 3 A / 250 Vac / 250 Vdc; SSR MOSFET (PNP/NPN): 400 mA / 60 Vac / 60 Vdc |
| Output Modes | ∙ Relay Type: Normally Open and Normally Closed; SSR Type: PNP or NPN |
| Power Supply | ∙ 20-250 Vac 50/60Hz Vac or 20-250 Vdc, Fail Under 18 Vac/Vdc, 50/60 Hz |
| Power Consumption | ∙ 5 VA (AC) or 2.5 W (DC) Max., 120 Vac/30 mA or 24 Vdc/75 mA Normal Operation |
| HARDWARE FEATURES | HTF1742 |
|---|---|
| Device Functionality | ∙ Point Level Detection Switch using Vibrating Tuning Fork Technology |
| Interface | ∙ Dual Relay (Normally Open and Normally Closed) |
| MECHANICAL SPECIFICATIONS | |
| Dimensions (Head) | ∙ 3.31" (W) x 4.21" (H) x 3.31" (D) / 84 mm (W) x 107 mm (H) x 84 mm (D) |
| Tuning Fork Length (Thread to Tip) | ∙ Top of Thread to Tip: 2.99" (76 mm) / Bottom of Thread to Tip: 2.12" (54 mm) |
| Package Dimensions | ∙ Depends on Probe Length (Please ask Sales for Details) |
| Package Weight | ∙ Depends on Probe Length (Please ask Sales for Details) |
| Ports | ∙ Two 1/2" NPT |
| Connection Fitting (Standard) | ∙ 3/4" NPT (Standard), 1" NPT (Optional) |
| Enclosure Casing Material | ∙ Type 4X Aluminum; IP66 |
| Fork Trigger Point | ∙ 0.51" (13 mm) From Tip of the Fork |
| Tuning Fork Material | ∙ Stainless Steel 316 or 316L Option |
| Repeatability | ∙ 0.02" (0.5 mm) |
| Hysteresis Band | ∙ ~0.08 (2 mm) |
| Process Pressure | ∙ 2900 PSI (200 BAR) Max |
| Minimum Density | ∙ 0.5 g/cm3 or 0.7 g/cm3 |
| Liquid Viscosity | ∙ Max 10000 mm2/S, 10000 cSt |
| Normal Switching Delay | ∙ Covered by Material: 0.5s | Not Covered by Material: ~1s |
| Optional Debounce Switching Time | ∙ Covered by Material: 5s | Not Covered by Material: 5s |
| Selectable Alarm Mode | ∙ High (Overflow) or Low (Dry Run) |
| LED Status Indicators | ∙ Green (Power): On = Normal, Off = Power Failure; Red (Signal): On or Off Based on Mode Setting |
| ELECTRICAL SPECIFICATIONS | |
| Signal Output | ∙ Relay Contact (SPDT): 3 A / 250 Vac / 250 Vdc |
| Output Modes | ∙ Relay Type: Normally Open and Normally Closed |
| Power Supply | ∙ 19-253 Vac 50/60Hz or 19-253 Vdc, Fail Under 18 Vac/Vdc, 50/60 Hz |
| Power Consumption | ∙ 1.3 W Max |
| Overvoltage Protection | ∙ Overvoltage Category III |
| Contact Capacity | ∙ 6 A / 250 Vac, 6 A / 28 Vdc |
| CERTIFICATION & COMPLIANCE | HTF1740/1741 | HTF1742 |
|---|---|---|
| Safety | ∙ Explosion-Proof for Use in Hazardous Environments | ∙ Explosion-proof for Use in Hazardous Environments |
| ∙ IECEx TUR 19.0037 | ∙ Conforms to IECEx | |
| ∙ Ex d IIB T4 or T5 or T6 Gb | ∙ Ex db IIC T6...T2 GA/Gb (Zone 0/1) | |
| ∙ Ex tb IIIC T130 °C or T95 °C or T80 °C Db | ∙ Ex tb IIIC T125 °C or T95 °C or T80 °C Db |
| GENERAL SPECIFICATIONS | HTF1740/1741 | HTF1742 |
|---|---|---|
| Operating Conditions | ∙ Tuning Fork: Process Temperature: -40 to 130 °C (-40 to 266 °F) | ∙ Tuning Fork: Process Temperature: -40 to 150 °C (-40 to 302 °F) |
| ∙ Housing: Ambient Temperature: -40 to 70 °C (-40 to 158 °F) | ∙ Housing: Ambient Temperature: -40 to 70 °C (-40 to 158 °F) | |
| ∙ Operating Humidity: 20 to 80 %, Non-Condensing | ∙ Operating Humidity: 20 to 80 %, Non-Condensing | |
| Warranty | ∙ 2-Year Parts and Labor | ∙ 2-Year Parts and Labor |
| ORDERING INFORMATION | |
|---|---|
| Model Numbers | ∙ HTF1740 (5" to 12" Tuning Fork Length Option in 1" Increments) |
| ∙ HTF1741 (13" to 118" Tuning Fork Length Option in 1" Increments) | |
| ∙ HTF1742 (2", 3", and 4" Tuning Fork Length Options) | |
| Accessory | ∙ Magnetic Switch Kit (1/2" NPT Direct-Mount Switch to verify operation), SX1000-MS1 |
| ∙ See Datasheets for additional ordering configuration information |
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