Braun 1697.32

Technical Dossier

Product Details And Specifications

Braun 1697 Series Technical Notes

The Braun 1697 Series represents a well-established line of precision thermometers and temperature measurement instruments deployed across global heavy industry sectors including chemical processing plants, petroleum refineries, nuclear facility auxiliary systems, and pharmaceutical manufacturing environments. The 1697 Series is recognized for its robust mechanical construction, calibrated bimetallic and liquid-in-glass sensing elements, and compliance with DIN EN 13190 and related industrial measurement standards. Installed base units remain operational in legacy process control loops where replacement with modern digital alternatives requires significant re-engineering of existing instrumentation panels. DriveKNMS maintains a dedicated inventory of 1697 Series units and sub-components to support long-term asset maintenance programs.

The Evolution of 1697 Series Architecture

The Braun 1697 Series was developed during the mid-20th century industrial instrumentation era, when bimetallic dial thermometers and capillary-tube sensing systems were the standard for process temperature monitoring. Early variants in the 1697 family used all-stainless wetted parts with glycerin-filled dials for vibration resistance, a design that proved durable enough to remain in service for decades in continuous-process industries.

As digital field instruments (HART-enabled RTDs, thermocouple transmitters) became dominant from the 1990s onward, the 1697 Series transitioned from primary instrumentation to a backup and verification role. Compatibility challenges arise when integrating 1697 Series mechanical readouts with modern DCS historian systems, as signal conversion from bimetallic deflection to 4–20 mA analog output requires auxiliary transmitter modules. The series entered its mature/end-of-production phase, making reliable spare parts sourcing a critical operational concern for facilities that have not yet completed full instrumentation upgrades.

1697 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent documented models within the Braun 1697 Series. Each unit is classified by its primary measurement function and construction specification:

1697.32: Bimetallic dial thermometer, 0–120°C range, 100mm dial, stainless stem
1697.10: Bimetallic thermometer, 0–60°C range, 80mm dial, back connection
1697.11: Bimetallic thermometer, 0–80°C range, 80mm dial, bottom connection
1697.12: Bimetallic thermometer, −20–60°C range, 80mm dial, adjustable angle
1697.20: Bimetallic thermometer, 0–100°C range, 100mm dial, bottom connection
1697.21: Bimetallic thermometer, 0–160°C range, 100mm dial, back connection
1697.22: Bimetallic thermometer, 0–200°C range, 100mm dial, stainless case
1697.23: Bimetallic thermometer, −30–50°C range, 100mm dial, glycerin-filled
1697.30: Bimetallic thermometer, 0–120°C range, 100mm dial, bottom connection
1697.31: Bimetallic thermometer, 0–160°C range, 100mm dial, adjustable stem
1697.33: Bimetallic thermometer, 0–200°C range, 100mm dial, back connection
1697.40: Bimetallic thermometer, 0–300°C range, 100mm dial, high-temp process
1697.41: Bimetallic thermometer, 0–400°C range, 100mm dial, industrial flange mount
1697.50: Bimetallic thermometer, −50–50°C range, 100mm dial, cryogenic service
1697.60: Bimetallic thermometer, 0–120°C range, 160mm dial, panel-mount version
1697.61: Bimetallic thermometer, 0–200°C range, 160mm dial, large-format display
1697.70: Bimetallic thermometer with thermowell, 0–120°C, 100mm dial, process isolation
1697.80: Bimetallic thermometer, 0–100°C, ATEX-rated enclosure, hazardous area

Quality Control for the 1697 Series Range

Each Braun 1697 Series unit processed through DriveKNMS undergoes a structured inspection protocol prior to dispatch. Mechanical inspection covers dial glass integrity, pointer alignment, case seal condition, and stem straightness. Functional verification includes immersion testing in a calibrated temperature bath at three reference points (typically 25%, 50%, and 75% of full scale) with deviation recorded against the original accuracy class (typically ±1% FSD per DIN EN 13190 Class 1 or Class 2). Connection threads are inspected for damage and re-tapped where necessary. Units with dial fogging, cracked bourdon elements, or stem corrosion beyond serviceable limits are quarantined and not offered for resale. All passed units are tagged with a DriveKNMS inspection reference number and dispatched with a condition report.