Configured for precise process monitoring and alarm management in industrial instrumentation networks, the Yokogawa UT35A (UT35A Digital Indicator with Alarms) provides direct physical signal processing for primary variables and auxiliary analog inputs.

Suffix Breakdown & Model Matrix

• UT35A: Base digital indicator model identifier.
• 0 (Basic control): Standard instrumentation type.
• 0 (Functions): No secondary auxiliary functions.
• 0 (Open networks): Standalone operation without integrated fieldbus network connectivity.
• 1 (Display language): Default English interface.
• 1 (Case color): Black (Light charcoal gray).
• -00: Standard fixed code.
• LP: Optional suffix denoting integrated 24 VDC loop power supply.

Hardware Specifications

Loop Power and Signal Conditioning

The UT35A features an integrated 24 VDC loop power supply (LP option) to excite field-mounted transmitters, eliminating the requirement for external power distribution blocks. The input stage supports high-resolution signal conversion for primary process variables, while the non-isolated auxiliary input handles secondary data points. The unit provides configurable control outputs, including relay contacts rated for 250 VAC, 3 A, or current outputs ranging from 4-20 mA to 0-20 mA.

Frequently Asked Questions

Q: Is the auxiliary analog input isolated from the primary PV input?

A: No, the auxiliary analog input on the UT35A is non-isolated. Care must be taken during wiring to ensure that the common-mode voltage between the auxiliary signal and the primary input does not exceed the specified isolation limits of the module to prevent measurement errors or damage.

Q: Can the UT35A be configured for heating/cooling control?

A: While the unit supports various control output types, heating/cooling functionality is typically restricted to specific model variations (such as the UT52A or UT32A series). Refer to the specific control output configuration of your unit to confirm dual-output capability.

Field Installation Guidelines

1. Ensure the panel cutout dimensions are 92 mm x 92 mm per DIN standards to ensure a secure fit for the 96 mm x 96 mm bezel.
2. Verify that the power supply voltage (100-240 VAC or 24 VAC/DC) matches the unit rating label before connection to prevent circuit failure.
3. Use M3.0 crimp terminals for all field wiring; ensure proper torque to prevent loose connections in high-vibration industrial environments.
4. Separate signal wiring (PV/Aux) from high-voltage power lines and relay output cabling to minimize induced noise.
5. Utilize the 24 VDC loop power supply terminals only for specified transmitter loads; do not exceed the internal current capacity of the LP option.