The DOLD BH 9098.90 Series Motor Load Transmitter (German: Belastungswandler / English: Active Power & Motor Load Transducer) is a benchmark industrial measurement and signal conversion instrument belonging to the prestigious VARIMETER family, researched and manufactured by E. DOLD & SÖHNE GmbH & Co. KG in Germany. In modern automated processing facilities, supervising motor drive loading states solely through pure current measurement methods (Current Monitoring) reveals substantial limitations: under low-load conditions (ranging from 0% up to approximately 60% of rated capacity), motor current changes very little because the reactive magnetizing current predominates. Consequently, standard current monitoring relays fail to reliably detect critical mechanical failures such as snapped V-belts, broken drive shafts, or centrifugal pumps running dry without fluid.

The DOLD BH 9098.90 series decisively overcomes this technological constraint by measuring actual effective/active power (P = U × I × cos φ for 1-phase, or P = √3 × U × I × cos φ for 3-phase networks) in real-time. Because active power directly correlates with the mechanical shaft load, the transmitter's output signal provides a true, linear representation of physical motor torque from 0% no-load up to 100% full capacity. This permits preemptive identification of mechanical drive irregularities well before equipment breakdown takes place. The unit translates this measured load into standard industrial analog process signals (0/4-20mA or 0-10V) for direct ingestion into PLCs, digital panel meters, or central SCADA supervisory systems.

This entry covers seven specialized configurations within the DOLD BH 9098.90 series:
1. BH9098.90/010 AC35-250V AC24A (UH=AC230/110V): Designed for single-phase motor loads across AC 35-250V with current capacity up to 24A, powered by an AC 230/110V auxiliary supply.
2. BH9098.90/011 3AC100-760V AC40A (UH=AC230/110V): Heavy-duty 3-phase variant spanning an ultra-wide 100-760V measuring range and direct currents up to 40A, powered by an AC 230/110V auxiliary supply.
3. BH9098.90/011 3AC60-440V AC8A (UH=AC230/110V): Standard 3-phase configuration covering 60-440V and up to 8A, powered by an AC 230/110V auxiliary supply.
4. BH9098.90/011 3AC60-440V AC800mA (UH=AC230/110V): High-sensitivity variant optimized for low-power drives or secondary current transformer (CT 5A/1A) secondary circuits with a measuring span of AC 800mA.
5. BH9098.90/011 3AC100-760V AC40A (UH=DC24V): High-power 40A 3-phase variant spanning 100-760V, powered by a safe DC 24V auxiliary supply.
6. BH9098.90/011 3AC60-440V AC8A (UH=DC24V): Standard 8A 3-phase model spanning 60-440V, powered by a DC 24V auxiliary supply.
7. BH9098.90/111 3AC60-440V AC8A (UH=DC24V): Advanced /111 variant featuring dedicated analog output stage scaling across 60-440V, 8A rating, powered by DC 24V.

Housed in a rugged BH enclosure (45 mm width) suited for 35mm DIN-rail mounting, the device incorporates integrated internal current transformers for straightforward wire feed-through. Fully certified under IEC/EN 60688 and IEC/EN 60947-1, the DOLD BH 9098.90 provides dependable, real-time drive protection across industrial processing plants worldwide.

• Manufacturer: DOLD (E. DOLD & SÖHNE GmbH & Co. KG)
• Country of Origin: Germany
• Product Series: VARIMETER BH 9098
• Configuration Code: BH 9098.90 (Including variants /010, /011, /111)
• Technical Classification: Active Power / Motor Load Transmitter (Belastungswandler)
• Included Product Part Numbers:
  - BH9098.90/010 AC35-250V AC24A (UH=AC230/110V)
  - BH9098.90/011 3AC100-760V AC40A (UH=AC230/110V)
  - BH9098.90/011 3AC60-440V AC8A (UH=AC230/110V)
  - BH9098.90/011 3AC60-440V AC800mA (UH=AC230/110V)
  - BH9098.90/011 3AC100-760V AC40A (UH=DC24V)
  - BH9098.90/011 3AC60-440V AC8A (UH=DC24V)
  - BH9098.90/111 3AC60-440V AC8A (UH=DC24V)
• Measuring Principle: True Active/Effective Power Measurement (P = U × I × cos φ / √3 × U × I × cos φ)
• Measuring Voltage Ranges:
  - 1-Phase variant (/010): AC 35 ... 250 V
  - 3-Phase standard: 3AC 60 ... 440 V
  - 3-Phase high-voltage: 3AC 100 ... 760 V
• Measuring Current Ranges: AC 800 mA, AC 8 A, AC 24 A, AC 40 A (Direct measurement or via external CT)
• Operating Frequency: 50 / 60 Hz (45 ... 65 Hz)
• Auxiliary Supply Voltage (UH):
  - AC models: AC 230 V / 110 V (selectable via terminal links)
  - DC models: DC 24 V (tolerance 0.8 ... 1.25 UH)
• Analog Output Signal: Standard industrial 0 ... 20 mA, 4 ... 20 mA, or 0 ... 10 V proportional to motor load
• Measurement Accuracy: Class 1.5 (< 1.5% of full scale according to IEC/EN 60688)
• Response Time: < 50 ms
• Module Dimensions (W x H x D): 45 x 84 x 121 mm (Standard BH enclosure)
• Mounting Architecture: Snap-on mounting for standard 35 mm DIN-rail (IEC/EN 60715)
• Connection Architecture: Vibration-resistant screw-clamp terminals with integrated feed-through channels
• Protection Degree: Housing IP40, Terminals IP20 (according to IEC/EN 60529)
• Ambient Operating Temperature: -20°C to +60°C
• Compliant Safety Standards: IEC/EN 60688, IEC/EN 60947-1, IEC/EN 61000-6-2, IEC/EN 61000-6-4, CE
• Typical Applications: Submersible pump dry-run prevention, broken belt detection, mixer overload supervision, CNC spindle tool wear monitoring, crusher jam protection