I. Basic Information

Model: Z7306

Manufacturer: German HIMA (Paul Hildebrandt GmbH)

Product Type: HART分流 adapter / Parallel resistance module (for connecting HART operator panel to analog circuits)

Purpose: Provide 250 Ω HART resistor in 4–20 mA analog circuits, allowing parallel connection of HART operator panel / modem without cutting off the signal, used for analog signal debugging and communication in SIS system

Compatible Systems: HIMatrix F30/F50/F60， H41q， H51q and other safety system I/O circuits

Installation Location： Inside the cabinet， at the I/O terminal side or in the intrinsically safe / flameproof circuits (depending on the explosion-proof rating

II. Technical Parameters (Operating Parameters)

HART Resistance: 250 Ω (with an accuracy of ±1%)

Loop Signal: 4–20 mA analog signal, compatible with HART protocol

Operating Voltage: DC 24 V (on the loop side, non-powered type)

Operating Temperature: -25 ℃ ~ +70 ℃

Relative Humidity: 5%–95% RH (without condensation)

Protection Level: IP20 (for indoor / cabinet installation)

Safety Level: SIL 3 (compatible with HIMA safety loop)

Certifications: TÜV, CE, IEC 61508 SIL 3

Connection Method: Screw terminals / Flat plugs (compatible with HIMA I/O terminal block)

Dimensions (approx.): 35 mm DIN rail installation, 2U width

Weight (approx.): 0.2 kg

III. Functions and Features

HART Parallel Connection, No Loop Interruption

Connected in series to the 4–20 mA loop and providing 250 Ω. The operator controller can be directly connected to Z7306 without interruption and without affecting the control signal.

SIL 3 Safety Adaptation

Designed specifically for HIMA SIS, the resistance stability and insulation withstand voltage meet the requirements of the safety system, and can be used for ESD/FGS/BMS.

Compact and Easy Installation, Plug-and-Play

Standard DIN rail, directly connected to the HIMA I/O terminal block, no on-site welding / crimping, reducing fault points.

Wide Temperature Range, Anti-interference

Industrial-grade temperature range, shielded design, suitable for strong interference environments such as petrochemical, chemical, and power industries.

IV. Typical Applications

Petrochemical: 4–20 mA transmitter loop of ESD system HART debugging

Natural Gas: Online configuration of pressure / level / temperature instruments at the station

Power: Boiler / Turbine SIS analog loop maintenance

Pharmaceuticals / Precision Chemicals: HART communication in explosion-proof circuits in hazardous areas

V. Installation and Wiring Tips

Wiring Sequence: Positive pole of 4–20 mA signal → Z7306 → Positive pole of the load / AI module; Negative pole directly connected.

Operator Controller Connection: Simply connect to the HART terminal of Z7306 for communication.

Installation Environment: Avoid severe vibration, humidity, and corrosive gases; Stay away from large power frequency inverters.

Maintenance: Regularly check terminal fastening and no rust; Replace the module when the loop resistance is abnormal.

VI. Compatibility Relationship (Selection Comparison)

Z7306: Standard 250 Ω HART分流 adapter (most commonly used)

Z7306/Ex： Explosion-proof version (requires additional confirmation of explosion-proof certification)