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• Designed to differentiate between gross failure and dust leakage
from faulty/failing flter systems including bag flters
• Selection of advanced features and options for improved functionality
• Supports simple and flexible confguration via keypad/display or remote PC software
• Improved performance over previous models
Filter Leak
Monitor with
optional added
value options
Dust
Filter Leak
Monitor
LEAK ALERT 73
Passionate
about
Particulate
The Leak aLert 73 is particularly well suited for use on fabric flter type
dust collectors (baghouses) and provides reliable and robust monitoring
of particulate leaks from bags. With its compact cost effective transmitter
design, pragmatic and reliable monitoring can now be provided for all
types of industrial bagflters. The instrument benefts, frst from PCME’s
unique ElectroDynamic™ Probe Electrifcation technology, secondly
advanced features enabling the Leak aLert 73 to be confgured for all
types of bagflters irrespective of cleaning sequence and fnally a choice
of feld upgradeable options to provide quality assurance (QA) features
for the user. The Leak aLert 73 is part of the PCME Leak Alert family
of products, which have been specifcally designed to detect low and
medium levels of dust leakage in addition to gross bag failure enabling
bagflter users to maximise flter performance.
technology/applications
System Description and Product Range
Principles of Operation

The Leak aLert 73 combines advanced signal processing techniques
with PCME’s unique ElectroDynamic™ Probe Electrifcation technology.
When the sensing probe is installed after the bagflter, particles in the
airstream interact with the sensing rod to induce a charge signature. The
resulting signal is fltered electronically to reject signals outside a defned
frequency range (including the dc Triboelectric signal) which makes the
instrument less susceptible to changes in particle velocity and virtually
eliminates the effect of any particle contamination on the rod. In bagflter
applications the instrument provides a robust signal proportional to dust
emissions which is used to monitor and detect bag leaks. The instrument
has the necessary features to discriminate between the variation in dust
due the bag cleaning sequence and real leak conditions.
Sensor
Duct
shown with
optional
external keypad
Emission Report
Company:A Non ContactMr Sellophane
Increases in particulate due to deteriorating bags within baghouse. A nuber
of replacements carried out as required.

From:08 Jun 07 00:00:00
Cal Factor: 0.50 (constant)

To:21 Jun 07 00:00:00

Device 1 : GTC1 Stack Total

Maximum:14.62

Average:3.860

Averaging Period:15 mins

   

 

0
Jun

 

1

 

2

 

3

 

4

 

5

 

6

 

7

 

8

 

9

 

10

 

11

 

12

 

13

 

14

 

15

 

16

 

17

 

18

 

19

 

20

Normal
operation
Bags
deteriorating
Change bags
Post bag
replacment

mg/m3
11Jun
21Jun
16Jun
0809Jun
10Jun
12Jun
13Jun
14Jun
15Jun
17Jun
18Jun
19Jun
20Jun
12:00
12:00
12:00
12:00
12:00
12:00
12:00
12:00
12:00
12:00
12:00
12:00
12:00
Leak Alert Monitors Bag Leak Conditions
The Leak aLert 73 provides powerful bag leak capability based on the following standard features:
Bag leak monitoring performance
· High quality leak response with suffcient dynamic range and time response
to track emissions from single and multi-compartment pulse cleaned bagflters
· Instrument drift and minimum detection level below 0.1mg/m3 with leak
monitoring to 500mg/m3
· Fully confgurable warning alarm and limit alarm levels with independent
alarm delay
· Convenient bag leak output range scaled 0-100%. Option for scaling in
defned units (user selectable)
Designed for practical bagflter issues
· Category 3 option is suitable for ATEX dust zone 22
(see Category 1 option for zones 20 and 21)
· Inbuilt surge protection to counter effects of indirect lightning
· Input available for marker pulse from bag cleaning cycle
· Industrially hardened enclosure and sensor mechanics provides convenient
connections to plant allowing armoured cable use
· Powered directly from mains power supply 100-240VAC (or 24VDC option)
Powerful user Interface
· 4 digit display and keypad within instrument
· Instrument set-up via internal keypad or PC/laptop (optional software required)
· Intuitive multilevel user interface (user set-up, engineering set-up) with password protection
· Three separate tri colour status LEDs, for power, emission alarms and instrument self-checks
Advanced Features
Leak aLert 73 with lid open showing
3 LEDs, display and internal set up keys
User Selectable Added Value Options
product features
The Leak aLert 73 is provided with a full choice of optional user selectable added value features. These include:
*option: requires external supply of 5-10 litres/min of dry, clean, oil free instrument air depending on dust loading.
Feature Specifcation

Ambient Air Temperature (stack limit is 250°C or 400°C)
Stack Gas Temperature

-25°C to +55°C
250°C standard, 400°C option

Stack Connection (at sensor connection)

1 ½” BSP

Enclosure Rating

IP-65 (with hinged lid closed)

Power Requirements

100-240VAC 50/60Hz (32mA) or 24VDC (300mA)

Outputs (Standard)
Outputs (Optional)

Isolated 4-20mA (500 ohm)
Warning alarm relay (SPST 1A@24VDC) Fail safe
Emission alarm relay (SPST 1A@24VDC) Fail safe
RS232 (Modbus RTU) - option
RS485 (Modbus RTU) - option
}Enables use of PC-ME Dust Tools PC software suite

Inputs

Plant stop signal (output to zero when plant is off), marker for start of bag cleaning sequence

External LED x3

1 Power/ sensor OK
2 Warning and limit alarm
3 Self check status (options)

User Set Up

4 digit display and set up buttons (external keypad and display option)

Cable Entries

3 x M20 gland/conduit entries

Air Purge Connection

Optional air purge ftting is required *1/4” BSP connection to instrument air line

Specifcations
· Automatic insulator contamination detection - option
ElectroDynamicTM sensors are tolerant to dust contamination of the sensor rod
(unlike Triboelectric systems) due to the non–contact measurement principle,
however, build-up of conductive material across the insulator at the base of
the rod can lead to error as with all charge electrifcation systems. For standard
dry dust collector applications, contamination is unlikely, but a possibility. The
short circuit check option provides a reliable method for detecting insulator
contamination and hence improve Quality Assurance (for applications where
water condensation is likely, PCME’s patented insulated sensor is a preferred
option).
· Electronic zero and reference drift detection - option
Electronic dust signals are injected into the front end of the sensor electronics
to ensure any electronic and signal measurement malfunction is automatically
detected. This Quality Assurance feature checks that the sensor electronics are
operating within manufacturer specifcation.
· User scaling of display
Of assistance to plant personnel wishing to manually scale the display to an approximate known dust level rather than a relative % level.
The Leak aLert 73 may be upgraded to provide Leak Locate capability by adding the optional Bag Pulse Display module. This enables plant operators
to locate the position of failing bag rows in the dust collector, hence reducing bag replacement costs and minimising time diagnosing dust collector faults.
Bag Pulse Display Module
Pulse Display permits failing bag rows to be
identifed during bag cleaning

Dimensions
specifcations

ID

 

A

Short Circuit Check

None
Short circuit check*

std
option

0
SC

B

Electronic Self-checks

None
Manually initiated

std
option

0
MAN

C

Scaling Method

0-100%
Scaling Factor

std
option

%
SF

D

ATEX Category

None
Category 3 dust (zone 22)
Category 1 dust (zone 20)

std
option
option

0
X22
X20

E

Power Option

100-240VAC
24V DC

option
option

AC
24DC

F

RS485 Data Output1

Not included
RS485 included

std
option

0
485

G

RS232 Data Output1

Not included
RS232 included

std
option

0
232

H

External Connector for
RS232

Internal connector
External connector

std
option

0
FLY

I

Keypad

Internal keypad
External keypad

std
option

IK
EK

J

Display

Internally Display
Externally viewable

std
option

ID
ED

P

Leak Locate Capabilities

Not included
Bag Pulse Display Module

option

BPD 0

SC 0

%

X22 AC 485 0 0 IK
Leak aLert 73 - 1 2 3 4 5 - a B C D e F G H I J - P
Sensor Features (A B C D E F G H I J P)
199 mm
181 mm
Leak aLert 73 (back view)
Order Codes
Example: Sen 73 - 250C ROD0500 S
1 2 3 A B C D E F G H
AP REG -
4 5 I J
About PCME Ltd
PCME Ltd
Clearview Building
60 Edison Road
St Ives Cambs UK
PE27 3GH
Tel: +44 (0)1480 468200
Fax: +44 (0)1480 463400
E-mail: contact@pcme.com
www.pcme.com
Issue 02/12_32
As a progressive environmental Company, PCME specialises in particulate measurement for industrial processes. With
a worldwide reputation for reliability, innovation and technological excellence, the Company produces equipment
for concentration and mass monitoring for regulatory, environmental and process control requirements. A dedicated
team of qualifed application and sales engineers is always on hand and should be consulted in the selection and usage
of the most suitable equipment for any particulate application.
PC Software Options (PC-ME Dust Tools)

Device Set

For instrument confguration by PC

Online

For viewing emissions on PC

Predict

For baghouse performance monitoring

Contact your national or area sales and service offce
Baghouse images reproduced with kind permission of Dantherm Filtration Ltd
Duct Connection
1½" BSP
Ø45 mm
Ø45 mm
296 mm 64 mm
106 mm
Ø15
175 mm
106 mm
55 mm rod
length
250°C Stainless steel 250°C Insulated 400°C Stainless steel
rod length
less 85 mm
rod
length
Ø15 Ø23
31
mm
175 mm
*not available with insulated rod material 1Cannot have both together
(standard version
without display and keypad)
Passionate
about
Particulate

1

Stack Temperature

Up to 250°C
Up to 400°C

options

250C 400C

2

Rod Length

0100mm to 1000mm

specify

RODxxxx

3

Rod Material

Stainless
Insulated (PTFE)

std
option

SI

4

Air Purge Fitting

None
Air Purge Fitting

std
option

0
AP

5

Air Filter/Regulator

None
Filter + regulator assembly

std
option

0
REG

Mechanical Options (12345)
BPD
P
-