Description

Riotronics RotaRead Pulse Adapter Kit

The Riotronics RotaRead Pulse Adapter Kit (RMLL-CU-CF-1P) converts mechanical rotation from a Dresser Roots rotary gas meter into a Form A dry contact pulse signal for use with flow computers, RTUs, data loggers, and telemetry systems.

Unlike many factory meter outputs that require powered electronics, the RotaRead provides a true dry contact (Form A) pulse output, making it ideal for applications where a simple, reliable, low-power signal is required.

This kit is designed for Roots B-Series and LMMA rotary meters and is commonly used in gas measurement, industrial monitoring, and remote telemetry applications.

Key Features

• Form A Dry Contact Output
Reliable digital pulse output compatible with most flow computers and telemetry systems.

• Designed for Dresser Roots Rotary Gas Meters
Compatible with B-Series and LMMA rotary gas meters.

• No External Power Required
Mechanical sensing produces a clean contact closure pulse.

• Simple Retrofit Installation
Installs on meters without an instrument drive.

• Ideal for Telemetry & SCADA Systems
Commonly used with gas flow computers, RTUs, PLCs, and data loggers.

Pulse Resolution (Process Valve Configuration)

The RMLL-CU-CF-1P supplied by Process Valve provides the following pulse outputs:

This resolution is well suited for gas telemetry, volume tracking, and remote monitoring applications.

Compatible Gas Meter Models

The RotaRead pulse adapter kit is designed for installation on:

• Dresser Roots B-Series rotary gas meters
• Dresser Roots LMMA rotary gas meters

For B-Series meters, the device installs on a meter cover without an instrument drive, with magnetic pickups mounted to the drive gear.

For LMMA meters, the adapter installs beneath the index cover and provides the same digital pulse output.

Output Specifications

Output Type
Form A dry contact (digital)

Optional Output
PS4 FET transistor output (power-saving electronics)

Duty Cycle
50% ON / 50% OFF ±6%

Maximum Pulse Rate
Dependent on meter speed
Shortest rate: 0.75 seconds per pulse

Operating Temperature
-40°F to +240°F

Optional Features (Factory Options)

• Dual independent outputs
• Power-saving FET electronics
• Custom wire lead lengths
• Tamper-sense wiring
• Conduit fitting for B-Series meters

Typical Applications

• Gas flow computers
• Remote telemetry units (RTUs)
• SCADA monitoring systems
• Data loggers
• Gas consumption monitoring

Why Use a Dry Contact Pulse Output?

Many rotary gas meter outputs require powered electronic transmitters. The RotaRead adapter instead provides a simple dry contact pulse, which offers several advantages:

• Works with almost any pulse input device
• No power consumption at the meter
• High reliability in harsh environments
• Easy integration with existing telemetry systems

Manufacturer Product Information

The RotaRead pulse adapter is manufactured by RIO Tronics and designed specifically for use with Dresser Roots rotary gas meters. For additional product details and technical documentation, you can view the manufacturer’s overview of the RotaRead pulse output device.

Learn more about the product directly from Riotronics.

Need Help Selecting a Pulse Output Device?

Process Valve has supported the oil & gas and natural gas measurement industry since 1951. If you need help selecting the correct pulse output adapter for your gas meter or telemetry system, our team can help.

Contact Us

[email protected]
1-800-922-8897
440-247-6111