K-BULK is the ultrasonic flow sensor designed for precise thermal energy measurement in centralized heating and cooling systems.
K-BULK is the ultrasonic flow sensor designed for precise thermal energy measurement in centralized heating and cooling systems. The measuring element, with no moving parts, ensures long-term reliability even under harsh operating conditions. The metallic body with IP68 protection includes battery-powered electronic (10+1 years lifetime), making the device suitable for humid or demanding environments. Thanks to the dual ultrasonic paths and compatibility with Maddalena KS3C calculators and KPTEG probes, K-BULK guarantees maximum accuracy and interoperability in direct metering systems.
| Measurement method | Ultrasonic; time of flight (TOF) |
|---|---|
| Accuracy class (MID) | Class 2 |
| Environmental class | Class C |
| Mechanical class | M2 |
| Electromagnetic class | E2 |
| Storage temperature | -20°C ÷ +60°C |
| Protection class | IP68 |
| Power supply | 3.6 V battery 10+1 years (default) |
| Module B nr. | DE-24-MI004-PTB0005 |
| Module D nr. | 0119-SJ-A010-08 |
| Installation position | Any U0-D0 |
|---|---|
| Sampling frequency | 4 Hz |
| Flow range | 1:100 |
| Temperature range | +1°C ÷ +130°C |
| Recommended temperature range for heating applications | +10°C ÷ +130°C |
| Maximum temperature | 150°C for 2000 hours |
| Maximum overload | 1,25 x qₚ |
| Nominal pressure | PN16 – PN25 |
| Type | Open drain |
|---|---|
| Pulse length | 100 ms |
| Pulse type | Synchronous |
| Pulse options | DN50 ÷ DN100: 1/10L DN125 ÷ DN300: 1/100L |
| Cable length | 3 m |
| Voltage | Max: 12 Vdc |
| Current | Max: 10 mAdc |
| Closed-contact resistance | 100 Ω |
| Maximum output pulse frequency | 10 Hz |

OVERALL DIMENSIONS
| Diameter | mm | 50 | 65 | 80 | 100 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Inches | 50 | 65 | 80 | 100 | |||||
| PN16 | PN25 | PN16 | PN25 | PN16 | PN25 | PN16 | PN25 | ||
| L | mm | 200 | 270 | 200 | 300 | 225 | 300 | 250 | 360 |
| H | mm | 221 | 229 | 253 | 281 | ||||
| D | mm | 165 | 185 | 200 | 220 | 235 | |||
| K | mm | 125 | 145 | 160 | 180 | 190 | |||
| B | mm | 120 | 135 | 165 | 180 | 212 | 200 | ||
| nxΦL | mm | 4xΦ18 | 4xΦ18 | 8xΦ18 | 8xΦ18 | 8xΦ18 | 8xΦ18 | 8xΦ22 | |
| Weight | kg | 8,00 | 9,50 | 8,50 | 11,50 | 11,80 | 16,00 | 15,00 | 21,00 |
| Diameter | mm | 125 | 150 | 200 | 250 | 300 |
|---|---|---|---|---|---|---|
| Inches | 125 | 150 | 200 | 250 | 300 | |
| PN25 | PN25 | PN25 | PN25 | PN25 | ||
| L | mm | 350 | 350 | 350 | 400 | 450 |
| H | mm | 370 | 400 | 459 | 520 | 575 |
| D | mm | 270 | 300 | 360 | 425 | 485 |
| K | mm | 220 | 250 | 310 | 370 | 430 |
| B | mm | n/a | n/a | n/a | n/a | n/a |
| nxΦL | mm | 8xΦ26 | 8xΦ26 | 12xΦ26 | 12xΦ30 | 16xΦ30 |
| Weight | kg | 13,68 | 18,90 | 38,19 | 57,56 | 78,52 |