Imac Type Series - User Manual

Drive Hub
Assembly
(included)
Index
(from meter)
Index Cover
(from meter)
Fillister
Head
Screws
#10-24 x
1
/
2
"
(from meter)
Panhead Screws
#10-24 x
3
/
8
"
(from meter)
Pulser
Assembly
(included)
P: 215-946-2200
www.imacsystems.com
IMAC PULSER TYPE III
Installation and Operations Instructions
For Use on Itron Metris 250, I-250 and 400A Diaphragm Gas Meters
PURPOSE:
To add a pulse signal to a gas meter with a ratio of
1 Pulse per 1 Cubic Foot
KIT INCLUDES:
(QTY: 1) Pulser Assembly (featuring a
Form ‘A’ Reed Switch)
(QTY: 1) Drive Hub Assembly
(QTY: 2) Security Seals
(QTY: 1) Identification
Label
www.lincenergysystems.com

Summary

IMAC PULSER TYPE III Installation and Operations Instructions

Purpose of the IMAC Pulser

To add a pulse signal to a gas meter with a ratio of 1 Pulse per 1 Cubic Foot.

Kit Inclusions

Lists included components: Pulser Assembly, Drive Hub Assembly, Security Seals, and Identification Label.

Installing the IMAC PULSER TYPE III

Detaching Meter Components

Instructions for unscrewing and removing the index cover and index from the meter.

Replacing Meter Drive

Guide for removing the brass meter drive and installing the supplied drive hub assembly.

Attaching Pulser and Index

Steps for attaching the pulser assembly, remounting the index, and aligning components.

Finalizing Installation and Testing

Includes remounting the index cover, inserting seals, testing pulse output, and affixing the label.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The IMAC PULSER TYPE III is a device designed to add a pulse signal to gas meters, specifically Itron Metris 250, I-250, and 400A Diaphragm Gas Meters. Its primary function is to provide a pulse signal with a ratio of one pulse per one cubic foot of gas, enabling remote monitoring or integration with other data acquisition systems.

Function Description:

The pulser assembly integrates with the existing gas meter mechanism to detect gas flow and convert it into electrical pulses. It features a Form 'A' Reed Switch, which is a common type of magnetic switch known for its reliability and long lifespan in metering applications. As the gas meter's internal mechanism rotates, the pulser assembly detects this movement and generates a corresponding electrical pulse. This pulse can then be used by various data logging or control systems to track gas consumption remotely. The device is designed to be a retrofit solution, meaning it can be installed on existing meters without requiring a complete meter replacement.

Important Technical Specifications:

The kit includes several components essential for its installation and operation:

• Pulser Assembly: This is the core component, featuring a Form 'A' Reed Switch. The reed switch is a magnetically actuated switch, which means it operates without physical contact, reducing wear and tear.
• Drive Hub Assembly: This component connects the pulser assembly to the meter's internal drive shaft, ensuring accurate pulse generation based on gas flow.
• Security Seals: Two security seals are provided to prevent tampering with the installed pulser and meter.
• Identification Label: An identification label is included for visual identification of the IMAC PULSER Type III on the meter.
• Screws: The installation process utilizes existing panhead screws (#10-24 x 3/8") and fillister head screws (#10-24 x 1/2") from the meter, which are used to secure the index, index cover, and pulser assembly.

The pulse output ratio is specified as 1 Pulse per 1 Cubic Foot. For testing purposes, the manual notes that every full revolution of the 2CF test dial will create 2 pulses, which is consistent with the 1 pulse per 1 cubic foot ratio (2 pulses for 2 cubic feet).

Usage Features:

The IMAC PULSER TYPE III is designed for straightforward installation on compatible Itron gas meters. The installation process involves several steps that require careful handling of meter components:

1. Detaching the Index Cover: The existing index cover, secured by three fillister head screws, must be removed. If present, red security caps need to be broken and removed first.
2. Detaching the Index: The meter's index, secured by two panhead screws, is then detached.
3. Removing the Brass Meter Drive: The existing brass meter drive is unscrewed in a counterclockwise rotation. This component is replaced by the supplied drive hub assembly.
4. Installing the Drive Hub Assembly: The new drive hub assembly is threaded onto the meter shaft clockwise, with the pin facing outward.
5. Attaching the Pulser Assembly: The pulser assembly is attached using the panhead screws from the index removal, initially leaving them loose.
6. Remounting the Meter's Index: The meter's index is remounted onto the panhead screws.
7. Alignment and Tightening: The mechanical index and drive hub assembly are aligned, and the panhead screws are tightened.
8. Remounting the Index Cover: The index cover is remounted using the fillister head screws, ensuring the index seal or gasket is not damaged. The pulser wires must be carefully guided around the meter's index and through the bottom notch or hole in the index cover to avoid twisting or straining.
9. Inserting Security Seals: New red security seals are inserted into the index cover holes.
10. Testing the Pulse Output: A multimeter set to ohm or continuity mode is used to test the pulse output. By slowly blowing air through the meter's inlet, the 2CF test dial will rotate, and the multimeter should indicate continuity (or sound an alert) for every two pulses generated per full revolution of the test dial.
11. Affixing Identification Label: The IMAC PULSER Type III label is affixed to the meter for visual identification.

The design emphasizes ease of installation, with clear instructions provided for each step. The use of existing meter screws and a direct replacement for the meter drive simplifies the process.

Maintenance Features:

The IMAC PULSER TYPE III is designed for low maintenance. The Form 'A' Reed Switch, being a non-contacting component, inherently has a long operational life and is less prone to mechanical wear compared to other switch types. The security seals help prevent unauthorized access and tampering, ensuring the integrity of the meter and pulser system. The installation process itself, particularly the careful routing of wires and ensuring no damage to the index seal, contributes to the long-term reliability of the installation. Regular checks would primarily involve verifying the pulse output using a multimeter, as described in the testing procedure, to ensure continued functionality. The robust construction and simple design contribute to its reliability in various operating environments.

Imac Type Series Specifications