1. Product Features

1.1 Core Functional Characteristics

• Enables configuration and calibration of smart HART transmitters with support for remote and local on-site operations.
• Access to the transmitter database and modification operations are password-protected to ensure data security.
• Equipped with built-in permanent memory, capable of storing up to 40 sets of configuration parameters.
• Supports universal and general practice HART commands, and can configure and manage all HART-compatible smart devices, including non-ABB instruments.
• Software installation and upgrade can be completed via PC software through an RS232 serial communication cable.
• The program library of ABB instrument devices can be directly transmitted from a personal computer to the 691HT memory configurator.

1.2 Display Content

1.2.1 Read-only Information

1.2.2 Read-write Information

2. Technical Parameters and Specifications

2.1 Communication Parameters

• Communication Protocol: Adopts Bell 202 standard Frequency Shift Keying (FSK) technology.
• Signal Transmission: Digital signals are superimposed on the transmitter power/signal lines for transmission, with zero average energy injected into the loop.
• Loop Load Requirement: The signal loop must be equipped with a minimum load resistance of 250Ω to support normal communication.
• Communication Cable: Maximum length of 1km (0.62 miles), wire gauge of 0.75-1.25mm².
• Load Capacitance: Less than 0.22μF.
• Load Inductance: Less than 3.3mH.

2.2 Hardware Specifications

• Display Screen: 128×64 dot matrix LCD display.
• Control Module: Touch key control, including 4 directional keys, 19 function keys, and 1 power switch.
• Communication Cable Length: 1.1m (3.6ft).
• Wiring Spacing Requirement: Maintain a spacing of more than 15cm from power lines to avoid parallel wiring.

2.3 Power Supply Specifications

• Power Supply Type: 4 pieces of 1.2V rechargeable batteries (Ni-MH or Ni-Cd).
• Dimensions: 180×80×54mm (Length × Width × Height).

2.4 Environmental Specifications

• Operating Temperature: -10℃ to 55℃ (refer to similar handheld devices).
• Vibration Resistance: Random vibration, 2g, 5-500Hz.
• Impact Resistance: 30g, 11-millisecond half-sine wave impact.
• Safety Standard Compliance: Compliant with EN61010-1:1993 and ANSI/ISA industry standards.

3. Structure and Composition

• LCD Display Screen: 128×64 dot matrix screen for displaying transmitter data and operation menus.
• Touch Keypad: Integrated with 4 directional keys, 19 function keys and 1 power switch for human-computer interaction.
• Internal Memory: Permanent storage module supporting up to 40 sets of device configuration data.
• Communication Interface: Equipped with RS232 serial interface for PC-based software upgrade and data transmission.
• Battery Pack: Power supply module composed of 4 1.2V rechargeable batteries.
• Communication Cable: 1.1m dedicated cable for connecting to transmitter loops.

4. Application Fields

4.1 Main Application Objects

• ABB smart HART transmitters (including 2600T series pressure transmitters, 600T series transmitters and other mainstream models).
• All HART protocol-compatible smart devices from third-party manufacturers.
• Suitable for communication and operation of pressure (differential pressure) transmitters and flow transmitters.
• Applicable to various flow meters such as V-cone flow meters, target flow meters and vortex flow meters.

4.2 Industrial Application Scenarios

• Process industrial automation control systems.
• Industrial pressure measurement and process control.
• On-site flow measurement and real-time monitoring.
• Industrial temperature measurement and signal transmission.
• On-site commissioning, calibration, daily maintenance and fault diagnosis of industrial automation equipment.

5. Installation and Operation

5.1 Connection Requirements

• A minimum load resistance of 250Ω must be installed in the current loop to ensure stable communication.
• Install a minimum 250Ω load resistance between the power supply and the connection point of the handheld terminal.
• The communication cable with a wire gauge of 0.75-1.25mm² supports a maximum transmission distance of 1km.
• Keep a spacing of more than 15cm between the communication cable and power line, and avoid parallel wiring to prevent signal interference.

5.2 Basic Operation Steps

1. Confirm that the current loop is equipped with a load resistance of no less than 250Ω.
2. Connect the 691HT communication cable to the transmitter signal loop.
3. Turn on the device power supply and wait for the system to complete startup.
4. Select the corresponding device model and configure relevant parameter items.
5. Perform targeted configuration, calibration or fault diagnosis operations as required.
6. Save the completed configuration parameters and disconnect the device connection safely.