Dwyer Instruments PMT2 Series, PMT2-05-A-U2 Installation And Operating Instructions Manual

Series PMT2 Particulate Transmitter

2X 1/2˝ NPT OR M20 ELECTRICAL ENTRY

[15.88]

L

1.13]

[147.64]

®

Specications - Installation and Operating Instructions

Bulletin PC-PMT2-M

The SERIES PMT2 Particulate Transmitter is designed to measure particulate emission
levels from dust collector discharge. Using DC coupled electrostatic induction sensing
technology, the transmitter monitors a pA current that is generated as particulate
passes near the probe; a 4 to 20 mA signal will vary based on the particulate level. The

PMT2 offers 6 sensitivity ranges allowing the user to choose the range that will best t

the application. The range and test selector switch can also be set to output a 4 mA or
20 mA signal to assist with set up or trouble shooting. Averaging time setting can be
used to dampen the signal if desired.

FEATURES/BENEFITS

• Simple 2-wire installation for PLC and control panels

• Non-stick PTFE coated probe to prevent false readings from moist and conductive
dusts, condensate, and dust buildup

• Remote zero calibration helps to decrease maintenance time

MODEL CHART

Example PMT2 -05 -A -U2 PMT2-05-A-U2
Series PMT2 Particulate transmitter

Probe
Length

Process
Connection

Enclosure Rating A2

Options STM2Stainless steel tag

*Options that do not have ATEX or IECEx.
Attention: Units without the A2 sufx are not Directive 2014/34/EC (ATEX)

compliant. These Units are not intended for use in potentially hazardous
atmospheres in the EU. These unites may be CE marked for other Directives
of the EU.

THREADED MOUNT
Probe
LengthAin [mm]

3˝

3 [76.20]

5˝

5 [127.00]

10˝

10 [254.00]

15˝

15 [381.00]

20˝

20 [508.00]

30˝

30 [762.00]

36˝

36 [914.40]

1.5˝ TRI-CLAMP MOUNT
Probe
LengthAin [mm]

3˝

3-1/2 [88.90]

5˝

5-1/2 [139.70]

10˝

10-1/2 [266.70]

15˝

15-1/2 [393.70]

20˝

20-1/2 [520.70]

30˝

30-1/2 [744.70]

36˝

36-1/2 [927.10]

03
05
10
15
20
30
36

A
B
C

3˝ probe length
5˝ probe length
10˝ probe length
15˝ probe length
20˝ probe length
30˝ probe length
36˝ probe length

3/4˝ male NPT

1.5˝ tri-clamp kit with 1˝ male NPT
3/4˝ male BSPT

ATEX and IECEx (IS)

U2

UL (IS)*

Female M20 electrical entries

(female 1/2˝ NPT standard)

B
in [mm]

1-25/32 [45.24]
3-25/32 [96.04]
8-25/32 [223.04]
13-25/32 [350.04]
18-25/32 [477.04]
28-25/32 [731.04]
34-25/32 [883.44]

3/4˝ NPT or 3/4˝ BSPT

5/8

“A”

3/4˝ Male NPT OR 3/4˝ Male BSPT Mount

2X 1/2˝ NPT OR M20 ELECTRICAL ENTRY

“B”

“A”

1.5˝ Tri-Clamp Option Mount

SPECIFICATIONS

Service: Air and compatible gases, any type of particulate conductive or non­conductive.

Wetted Materials: 316L SS, silicone, and PTFE.
Enclosure: Powder coated aluminum.

Accuracy: ±5% of reading.
Particulate Size: 0.3 microns and higher.

Detection Range: 5 to 5000 pA (6 selectable range options).

Temperature Limits: Ambient: -40 to 145°F (-40 to 63°C); Process: -40 to 248°F
(-40 to 120°C).
Pressure Limit: 30 psi (2 bar).

Output Signal: 4 to 20 mA.
Power Requirements: 12 to 28 VDC ( ).
Electrical Connection: Two 1/2˝ female NPT electrical entries or two M20 electrical

entries (A2 sufx only).

Terminal Block: Removable (16 to 20 AWG wire).
Process Connection: See model chart. BSPT process connections are not UL

listed.

Probe Lengths: See model chart.
Enclosure Rating: UL Type 4 (IP66) ATEX/IECEx IP65.
Mounting Orientation: Any.
Averaging Time: 1 to 360 s (10 selectable options).
Weight: Varies with length of probe and type of mount.
Agency Approvals: CE, cULus; ATEX Compliant: 0518 II 1 G Ex ia IIB T4 GA

(-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
(-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T

16ATEX1768 X. ATEX Standards: EN 60079-0:2012/A11:2013; EN 60079-11:2012.

IECEx Certied: Ex ia IIB T4 Ga (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
Ex ia IIIC T120°C Da (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
Certicate of Conformity: IECEx UL 16.013X. IECEx Standards: IEC 60079-0: 2011;

IEC 60079-11: 2011. UL Listed Intrinsically Safe for Class I, Groups C and D; Class

II, Groups E, F and G; Class III; Class I Zone 0 AEx ia IIB T4 Ga; Class I Zone 0 Ex

ia IIB T4 Ga.

1-1/2

[38.10]

1˝ NPT

3/4

[19.05]

4-15/16
[125.41]

5-13/16

3-29/32

[99.22]

3-29/32

[99.22]

Process ≤ 120°C) / II 1 D Ex ia IIIC T120°C Da
Process ≤ 120°C). Type Certicate No.: DEMKO

ALLOW 1-1/4˝ [32]
FOR COVER REMOVA
BOTH SIDES

Process ≤ 120°C).

Process ≤ 120°C) /

[11

4-3/8

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: [phone]
Fax: [phone]

www.dwyer-inst.com
e-mail: [e-mail]

OPERATING PRINCIPLE
Technology

The PMT2 utilizes a highly reliable DC coupled electrostatic induction sensing

technology. The sensor probe is mounted in an airow stream such as a pipe, duct

or stack. The inductive effect takes place when particulate passes near the probe

transferring a charge from the particulate to the probe. A microprocessor lters and

processes the signal into a output that is linear to the mass concentration of particulate.

The PTFE coated probe ensures reliable operation with all types of particulate including
moist powders and highly conductive dusts. The PTFE coated probe eliminates the
need for an air purge and keeps maintenance to a minimum.

Particulate Monitoring

The PMT2 is specically designed to continuously monitor the particulate levels in air
ow from stacks or other emission points being passed through a lter within an air
ltration system. The transmitter should be installed in the exhaust ductwork and can
be used in conjunction with various types of bag, ceramic, cartridge or cyclone lters.
When the PMT2 is rst installed a baseline reading must be measured and noted. This

baseline reading is application dependent and should be measured independently for
each installation. From this baseline the operator will monitor output signal from the
PMT2. The increase in mA output indicates a rising level of particulate in the air stream

which indicates that lters are either wearing out or broken.

The PMT2 is designed to give a proportional output based on the particulate levels in
a duct or pipe, it is not designed to output a signal based on the particulate volumetric

ow. Different types of particulate carry different charges, meaning that two particulates
owing at the same volumetric ow rate could have different output response. The
PMT2 is designed to nd a baseline under ideal operating conditions and allow an
operator to watch the output signal for increases that would signify the bags or lters
are starting to wear or break. The six sensitivity ranges allow the PMT2 to monitor

particulates with low charge properties or high charge properties. As a reference, Table
1 lists particulate charge properties and the suggested range.

INSTALLATION
Unpacking

Remove the PMT2 from the shipping carton and inspect for damage. If damage is
found, notify the carrier immediately.

Location

The following factors should be considered when determining the installation location
for the PMT2:

• Make sure the transmitter is rated for the area classication it will be mounted in.

• Mount the transmitter in a location that will not exceed the temperature and pressure
ratings listed in the specications. The process pressure should not exceed 30 psi (2

bar).

• Make sure the 4 to 20 mA signal wires are not sharing the same conduit with high
voltage power wires.

• Make sure the location the transmitter is mounted in meets the NEMA or IP rating
for the enclosure.

• Locate the transmitter in a location were it can be accessed in case service is
required.

The PMT2 should be mounted in a grounded metal stack, pipe or duct. It should not

be mounted in berglass or plastic stacks, pipes or ducts. The sensing probe should

reach 1/2 to 2/3 the way across the stack, pipe or duct to ensure accurate readings.
For the most stable and accurate readings it is recommended to mount the PMT2 in

a location where the air ow is as laminar as possible. Avoid mounting the transmitter

close to blowers and dampers that cause turbulence. It is ideal to mount the PMT2 in
an area with two upstream duct diameters and one down stream duct diameter that
are free of turbulent causing objects. The sensing probe is coated in a non-stick PTFE
preventing material from coating the probe reducing the need for cleaning or an air
purge.

Neutral

Particulate Suggested Range

Human Hands
Asbestos
Rabbit Fur

Acetate
Glass
Mica
Human Hair

Nylon

PositiveNegative

Wood
Fur
Lead
Silk

Aluminum
Paper

Cotton

Steel
Wood

Mylar™
Nickel/Copper
Silver/Brass
Gold/Platinum
Sulfur

Acetate Rayon
Polyester
Styrene (Styrofoam)
Acrylic
Saran™
Polyurethane

Polyethylene
Polypropylene
Vinyl (PVC)
Silicon
PTFE
Silicone Rubber

Table 1: Suggested Ranges

5 to 5000 pA

5 to 1000 pA

5 to 500 pA

5 to 100 pA

5 to 500 pA

5 to 1000 pA

5 to 5000 pA

WIRING

(IF USED)

REMOTE ZERO

NOTICE

• Always install or service this device with the power off and where
required install a disconnect lockout

• Use 16 to 20 AWG copper wire only for line and load connections. Installation must
be made in accordance with local codes and regulations such as the National Electric
Code

• Degree of protection TYPE 4 (IP66) is maintained when suitable glands/plugs are
used in conjunction with UL Listed models

WARNING

HAZARDOUS LOCATIONS
To prevent ignition of hazardous locations the following cau-

tions should be taken:

• Keep device covers tightly closed in operation

• De-energize supply circuit before opening device covers

• Replace device covers before energizing the electrical circuits

• Device is not eld repairable and should be returned to Dwyer Instruments if repair

is needed

WARNING

INTRINSIC SAFETY SPECIFIC CONDITIONS OF USE
To maintain Intrinsic Safety the following cautions should be

taken:

• 4-20 mA signal and remote zero must be treated as separate circuits

• Enclosure parts are constructed of aluminum. Enclosure must be protected from
ignition hazard due to impact or friction

• All openings to enclosure must be sealed using suitable glands and/or plug main-

taining a minimum IP rating of IP66 for UL Listed models and IP65 for ATEX/IECEx

compliant models

• Substitution of parts may impair Intrinsic Safety.

CONTROL DRAWING UL LISTED INTRINSIC SAFETY (SUFFIX U2):

UL Listed Intrinsically Safe for use in Class I Div. 1 Groups C and D; Class II Div. 1

Groups E, F and G; Class III Div. 1; Class I Zone 0 AEx ia IIB T4 Ga; Class I Zone 0 Ex

ia IIB T4 Ga; T4@63°C when installed in accordance with Control Drawing 001744-48
on page 6 of this document.

ATEX COMPLIANT (SUFFIX A2)

II 1 G Ex ia IIB T4 Ga (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
IIIC T120°C Da (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T

Process ≤ 120°C) / II 1 D Ex ia

Process ≤ 120°C) when installed in

accordance with Control Drawing 001744-81 on page 7 of this document.

POWER SUPPLY REQUIREMENTS

The maximum DC power supply is 28 VDC. The minimum required DC power supply

is based upon the following:

1. Minimum DC voltage requirement of the Model PMT2.

2. Total load resistance.

3. Total leadwire resistance.

4. Zener barrier voltage drop (Model PMT2-XX-X-X2 only).

The formula for calculating the DC Power Supply is:

VDC = VPMT2 + VLOAD + VLEADWIRE + VBARRIER

Where VPMT2 = 9.5 V
VLOAD = Total load resistance X 20 mA
VLEADWIRE = Total leadwire resistance X 20 mA
VBARRIER = 8.1 V (Typical zener barrier voltage drop for this application)

Example 1: Calculate minimum DC power supply for intrinsically safe models

Step 1 VPMT2 = 9.5 V
Step 2 Calculate VLOAD. Using the industry standard 250 Ω conversion
resistor, VLOAD = 250 X 20 mA = 5 V.
Step 3 Calculate VLEADWIRE. For this example assume a leadwire
resistance of 10 Ω, VLEADWIRE = 10 X 20 mA = 0.2 V
Step 4 VBARRIER = 8.1 V
Step 5 VDC = VPMT2 + VLOAD + VLEADWIRE + VBARRIER = 9.5 + 5 +

0.2 + 8.1 = 22.8 V

CONTROLS

WARNING

LIVE MAINTENANCE PROCEDURE

Live maintenance of Zero, Averaging Time, Range and Test

controls cannot be performed when a ammable or combustible atmosphere is

present.

Zero Switch (see Figure 2)

Press and hold the switch for 3 seconds and the PMT2 will digitally re-zero. It is

recommended to re-zero after a lter failure or lter changes. Re-zeroing should only
be done when there is no air ow in the duct.

Averaging Time Selection Switch

The PMT2 will average the output for the selected amount of time. This will dampen

output spikes caused during normal lter cleaning cycles.

IECEx COMPLIANT (SUFFIX A2)

Ex ia IIB T4 Ga (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
Da (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T

Process ≤ 120°C) when installed in accordance

Process ≤ 120°C) / Ex ia IIIC T120°C

with Control Drawing 001744-81 on page 7 of this document.

INTRINSIC SAFETY INPUT PARAMETERS:

4-20 mA Signal, Vmax (Ui) = 28 V; Imax (li) = 93 mA; Ci = .022 μF; Li = 0.373 mH;
Pmax (Pi) = 651 mW
Remote Zero, Vmax (Ui) = 28 V; Imax (li) = 93 mA; Ci = Negligible; Li = 0 mH; Pmax
(Pi) = 651 mW

POWER
SUPPLY

RECEIVER

4 to 20mA

4
3
2
1

REMOTE ZERO SWITCH

Figure 1: General Installation Wiring (Non-IS)

Range and Test Selection Switch

There are 6 sensitivity ranges that can be selected based on the material the PMT2
will be sensing (see Table 1). There is also an option to output a 4 mA or 20 mA signal,
these options can assist in the installation of the transmitter or trouble shooting.

Zero Switch

Averaging

Time

Range &

Grounding

Screw

Tes t

Figure 2

SET UP

1000 pA

Spike Alarm

TIME

Mounting

Make sure the PMT2 is securely mounted to the stack, pipe or duct to prevent vibration
during operation. Make sure the transmitter is grounded properly.

Control Signal Set Up

Check the power supply wiring to make sure the polarity is correct before powering
the PMT2. Turn the power on to the transmitter and turn the Range and Test selector
switch to 4 mA (position 2). The PMT should output 4 mA, check the output with a

multi-meter or at the device (PLC, Display, etc.) receiving the output signal. Once it is
veried the 4 mA signal is being received, switch the Range and Test selector switch to

20 mA (position 1) and repeat the process. If the output is 0 mA, make sure the power
supply is on and check for loose wires.

Range and Test Selection

When selecting one of the 6 available ranges, the baseline and maximum peak signals
that take place during lter cleaning must be taken into account. The selected ranges
should have enough resolution to monitor the baseline and capture the maximum

peaks during a cleaning cycle. The four linear ranges output 4 mA at 5 pA and 20 mA

at maximum range. The two logarithmic ranges have ner resolution at the low end of

the ranges and less at the high end.

Switch Position Range Output

1 Test 20 mA
2 Test 4 mA
3 5 to 100 pA 5 pA = 4 mA

4 5 to 500 pA 5 pA = 4 mA

5 5 to 1000 pA 5 pA = 4 mA

6 5 to 5000 pA 5 pA = 4 mA

7 Log 5 to 500 pA 5 pA = 4 mA

8 Log 5 to 5000 pA 5 pA = 4 mA

Note: Position 9 and 0 are unused.

Table 2: Range and Test Switch

25 pA = 8 mA
50 pA = 12 mA
75 pA = 16 mA
100 pA = 20 mA

125 pA = 8 mA
250 pA = 12 mA
375 pA = 16 mA
500 pA = 20 mA

250 pA = 8 mA
500 pA = 12 mA
750 pA = 16 mA
1000 pA = 20 mA

1250 pA = 8 mA
250 pA = 12 mA
3750 pA = 16 mA
5000 pA = 20 mA

16 pA = 8 mA
50 pA = 12 mA
158 pA = 16 mA
500 pA = 20 mA

28 pA = 8 mA
158 pA = 12 mA

890 pA - 16 mA

5000 pA = 20 mA

LOGARITHMIC RANGE

The logarithmic ranges offer a prolonged low-end of the scale while the high-end of the
range is compressed. This offers better resolution for the baseline monitoring and still
allows the operator to see the particulate spikes during cleaning cycles. Logarithmic

ranges are recommended for lter bags since they have a greater tendency for

particulate spikes during cleaning cycles.

LOGARITHMIC RANGE EQUATIONS

(M-4)

pA = 10 x R + 0.699

(

16

pA = Measured (pA) Picoamps
M = Measured (mA) Milliamps from the PMT2
R = 2 (for Logarithmic Range 5 to 500 pA)
R = 3 (for Logarithmic Range 5 to 5000 pA)

Example 1: Logarithmic Range 5 to 500 pA with current output of 12 mA:

(12-4)

pA = 10 x 2 + 0.699

(

16

pA = 50

Example 2: Logarithmic Range 5 to 5000 pA with current output of 14 mA:

(14-4)

pA = 10 x 3 + 0.699

(

16

pA = 375

SETTING EMISSION LEVEL ALARMS

The PMT2 will provide a 4 to 20 mA signal based on the range selected at set up.
Alarms can be programmed in the PLC or control system based on the 4 to 20 mA
signal from the particulate transmitter.

It is suggested to set two alarm set points. One alarm set point to monitor the emission

spikes and the second alarm to detect an increase in the baseline.

The alarm monitoring the emission spikes should be set to identify changes in the

spikes caused by the cleaning cycles. As lters become worn, the spike’s height and

duration will increase. The emission spike frequency will also increase because the

lters will require more frequent cleaning as they wear out. If there is a continuous
output above the emission spike alarm, it is more than likely a lter has torn and should

be changed right away.

The baseline alarm should detect an increase in the baseline reading. The type of
dust collector and facility regulations will dictate where the baseline alarm has to be
set. Typically the baseline alarm should be set 4 to 5 times over the initial baseline

reading measurement when lters are rst installed. So, if the baseline is 10 pA the

base line alarm should be set between 40 pA and 50 pA. It is recommended to set a
time delay in the PLC or control panel alarm to prevent false alarms during cleaning
cycles. When the output signal from the PMT2 is continuously above baseline alarm

it is time to replace the lters. If the emission spikes have increased yet the baseline
remains unchanged, it’s an early indication that the lters are starting to wear out and

will need to be changed soon.

)

)

)

750 pA

Emission

500 pA

Baseline

Alarm

5 pA

Spikes caused
by cleaning

Increased spike
because of
filter wear

Figure 3: Typical Filter Emissions

Increased spike and
baseline because
of filter wear

Replaced

filters

AVERAGING SELECTION

The PMT2 offers a digital averaging function because of the irregular ow of particulates

and the spikes during cleaning cycles. There are ten options for averaging ranging
from 1 to 360 seconds. The digital averaging takes a running average of the readings
for the selected amount of time. This will dampen output spikes from particulate

uctuations that could trip alarm settings. It is important to select an averaging setting

that will allow the operator to see the cleaning cycles. It is recommended to monitor the
baseline trend and peak to peak trend between cleaning cycles.

ZERO CALIBRATION

Even though the PMT2 will come zeroed from the factory it is recommended to zero
the transmitter after installation to ensure the best accuracy. When zeroing the PMT2,

make sure the dust collector is shut down and there is no air ow in the duct, stack or

pipe the transmitter is monitoring. It is recommended to re-zero the PMT2 once every
12 months for optimal performance. Please check your local laws and regulations as
clean air standards may require zero calibration on a certain time schedule based

on application. There are two ways the PMT2 can be zeroed. The rst method is

with the zero button on the front of the transmitter. Press and hold the button for 3
seconds and the transmitter will begin zeroing. The second method is the remote zero.
Supply DC voltage as shown in Figure 4 across the zero terminals on the back of
the transmitter for at least 3 seconds for the transmitter to start zeroing. While the
transmitter is zeroing, the PMT2 will output about 3.5 mA. The zero function will take

approximately 3 minutes. When zeroing is complete the output will return to a normal

output signal and the transmitter is ready for operation.

Remote Zero

10 to 28 V

- +

Zero Switch

MAINTENANCE/REPAIR

Upon nal installation of the Series PMT2, no routine maintenance is required. The
Series PMT2 is not eld serviceable and should be returned if repair is needed. Field

repair should not be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.

Note: Do not zero the PMT2 while the dust collector is in operation.

Figure 4: Remote Zero and Zero Switch

Symptom Potential Source Corrective Action

High Output Loop Wiring Check for dirty or defective terminals,

Power Supply Check the output voltage of the power

Erratic Output Loop Wiring Check the output voltage of the power

Low or No Output Zeroing The PMT2 will output about 3.5 mA

Loop Wiring Check for intermittent shorts, open

Table 3: Troubleshooting

interconnecting pins or receptacles.

supply at the transmitter terminals. It
should be 9.5 to 28 VDC.

supply at the transmitter terminals. It
should be 9.5 to 28 VDC.
Check for intermittent shorts, open
circuits and multiple grounds.
Check the polarity at the signal
terminals.

while zeroing. Wait approximately 3

minutes and the 4 to 20 mA signal
should return to normal.

circuits and multiple grounds.
Check the polarity at the signal
terminals.
Check the loop impedance.

’

’

–––

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: [phone]
Fax: [phone]

www.dwyer-inst.com
e-mail: [e-mail]

Partikeltransmitter Serie PMT2

2X 1/2˝(12,7 mm) NPT ODER M20

[15.88]

AUF BEIDEN SEITEN

[147.64]

®

Technische Daten – Installations- und Betriebsanleitung

Merkblatt PC-PMT2

GEWINDEMONTAGE
Sonde
LängeAin [mm]

3˝

3 [76.20]

5˝

5 [127.00]

10˝

10 [254.00]

15˝

15 [381.00]

20˝

20 [508.00]

30˝

30 [762.00]

36˝

36 [914.40]

MONTAGE TRI-CLAMP 1.5˝ (38 mm)
Sonde
LängeAin [mm]

3˝

3-1/2 [88.90]

5˝

5-1/2 [139.70]

10˝

10-1/2 [266.70]

15˝

15-1/2 [393.70]

20˝

20-1/2 [520.70]

30˝

30-1/2 [744.70]

36˝

36-1/2 [927.10]

Der Partikeltransmitter der SERIE PMT2 dient der Messung des Partikelausstoßes
von Entstaubern. Mittels einer direkt gekoppelten elektrostatischen
Induktionssensortechnologie überwacht der Transmitter einen pA-Strom, der entsteht,
wenn sich ein Partikel entlang der Sonde bewegt; das Signal beträgt je nach Stärke des

Partikels zwischen 4 und 20 mA. Der PMT2 bietet 6 Empndlichkeitsstufen, so dass der

Benutzer diejenige auswählen kann, die am besten zu seiner Anwendung passt. Auch
der Auswahlschalter für Messbereich und Tests kann auf ein Ausgabesignal von 4 mA
oder 20 mA eingestellt werden, wenn dies bei der Einrichtung oder Fehlerbehebung
hilfreich ist. Bei Bedarf lässt sich zur Dämpfung des Signals die Zeiteinstellung mitteln.

MERKMALE / VORZÜGE

• simple 2-Drahtmontage für SPS und Steuertafeln

• haftabweisende Sonde mit PTFE-Beschichtung gegen Falschmessungen an

feuchtem und leitfähigem Staub, Kondensat und Staubansammlungen

• durch Nullkalibrierung aus der Ferne verringert sich Wartungszeit

TABELLE
Beispiel PMT2 -05 -A -U2 PMT2-05-A-U2
Serie PMT2 Partikeltransmitter

Sondenlänge 03

Prozessanschluss A

Gehäuse A2U2ATEX und IECEx (IS)

Optionen STM2Kennzeichnung Edelstahl

*Optionen ohne ATEX- oder IECEx-Schutz
Achtung: Geräte ohne A2-Sufx sind nicht nach 2014/34/EC (ATEX) zertiziert.
Diese Geräte sind für den Einsatz in explosionsgefährdeten Räumen nicht

geeignet. Sie sind nur nach CE getestet.

05
10
15
20
30
36

B
C

B
in [mm]

1-25/32 [45.24]
3-25/32 [96.04]
8-25/32 [223.04]
13-25/32 [350.04]
18-25/32 [477.04]
28-25/32 [731.04]
34-25/32 [883.44]

Sondenlänge 3˝ (76.20 mm)
Sondenlänge 5˝ (127 mm)
Sondenlänge 10˝ (254 mm)
Sondenlänge 15˝ (381 mm)
Sondenlänge 20˝ (508 mm)
Sondenlänge 30˝ (762 mm)
Sondenlänge 36˝ (914 mm)

Außengewinde 3/4˝ (19 mm)

1.5˝ (38 mm)-Tri-clamp-Bausatz mit 1˝

(25 mm)-NPT-Außengewinde

3/4˝ (19 mm) BSPT-Gewinde

UL (IS)*

Sockel M20 elektrische Eingänge

(Sockel 1/2˝ (12.7 mm) NPT-

Standard)

5/8

Montage NPT-Außengewinde 3/4˝ (19 mm) ODER

ELECTRISCHER EINGANG

3/4˝ (19 mm) NPT oder

3/4˝ (19 mm) BSPT

“A”

3/4˝ (19 mm) Montage BSPT-Außengewinde

2X 1/2˝(12,7 mm) NPT ODER M20
ELECTRISCHER EINGANG

“B”

Montageoption Tri-Clamp 1.5˝ (38 mm)

3-29/32

[99.22]

3/4

[19.05]

1-1/2

[38.10]

1˝ (25 mm) NPT

“A”

TECHNISCHE DATEN
Wartung: Luft und kompatible Gase, alle Arten von Partikel leitend oder nicht

leitend.

Mediumberührende Teile: 316L SS, Silikon und PTFE.
Gehäuse: pulverbeschichtetes Aluminium.
Genauigkeit: ±5 % des Messwerts.
Partikelgröße: 0,3 Mikrometer und mehr.
Messbereich: 5 bis 5000 pA (6 auswählbare Messbereichsoptionen).
Temperaturbereich: Umgebungstemp.: -40 to 145 °F (-40 bis 63 °C);

Prozesstemp.: -40 bis 120 °F (-40 bis 248 °C).

Druckbereich: 30 bar (2 psi).
Signalausgabe: 4 bis 20 mA.
Leistungsbedarf: 12 bis 28 V Gleichstrom ( ).
Elektrischer Anschluss: Zwei 1/2˝ NPT-Außengewinde für elektrische Eingänge

oder zwei M20 elektrische Eingänge (A2 nur Sufx).

Klemmleiste: abnehmbar (Draht 16 bis 20 AWG).

Prozessanschluss: Siehe Tabelle. BSPT-Prozessanschlüsse sind nicht UL­gelisted.

Sondenlängen: Siehe Tabelle.
Gehäuse: UL-Typ 4 (IP66) ATEX/IECEx IP65.
Montagerichtung: alle.
Mittelungszeit: 1 bis 360 s (10 auswählbare Optionen).
Gewicht: je nach Probenlänge und Art der Befestigung.
Zulassungen: CE, cULus; ATEX zertiziert: 0518 II 1 G Ex ia IIB T4 GA (-40°C

≤ Tamb ≤ 63°C) (-40°C ≤ T
(-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T

16ATEX1768 X. ATEX-Standards: EN 60079-0:2012/A11:2013; EN 60079-11:2012.

IECEx Zertiziert: Ex ia IIB T4 Ga (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
/ Ex ia IIIC T120°C Da (-40°C ≤ Tamb ≤ 63°C) (-40°C ≤ T
Konformitätszertikat: IECEx UL 16.013X. IECEx-Standards: IEC 60079-0: 2011;
IEC 60079-11: 2011. UL als eigensicher Klasse I, Gruppe C und D eingestuft;
Klasse II, Gruppe E, F und G; Klasse III; Klasse I Zone 0 AEx ia IIB T4 Ga; Klasse I
Zone 0 Ex ia IIB T4 Ga.

4-15/16
[125.41]

5-13/16

3-29/32

[99.22]

Prozess ≤ 120°C) / II 1 D Ex ia IIIC T120°C Da

Process ≤ 120°C). Zertikat Nr.: DEMKO

SPIELRAUM 1-1/4˝ (32 mm) [32]
FÜR ENTFERNUNG DER
ABDECKUNGEN

Prozess ≤ 120°C).

Prozess ≤ 120°C)

4-3/8

[111.13]

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, USA

Tel.: +1 - 219/879-8000
Fax: +1 - 219/872-9057

www.dwyer-inst.com
E-Mail: [e-mail]

FUNKTIONSPRINZIP
Technologie

Der PMT2 verwendet eine höchst verlässliche direkt gekoppelte elektrostatische
Induktionssensortechnologie. Dabei wird die Sensorsonde in einem Luftstrom montiert
wie beispielsweise einer Leitung, einem Rohr oder Schacht. Der induktive Effekt tritt ein,
wenn sich ein Partikel an einer Sonde entlang bewegt, so dass die Ladung vom Partikel

auf die Sonde übertragen wird. Dabei ltert ein Mikroprozessor das Signal und wandelt es

in ein Ausgabesignal um, das sich linear zur Massenkonzentration des Partikels verhält.

Die beschichtete PTFE-Sonde gewährleistet bei allen Partikeln einen verlässlichen
Betrieb, einschließlich Feuchtpulver und hochleitfähiger Stäube. Dank der
beschichteten PTFE-Sonde wird keine Sperrluft benötigt und die Wartung auf ein
Mindestmaß beschränkt.

Partikelüberwachung

Der PMT2 ist speziell zur durchgängigen Überwachung des Partikelgehalts in
Luftströmen aus Schächten und anderen Ausstoßstellen ausgelegt, die durch einen Filter

in einer Luftlteranlage geleitet werden. Der Transmitter sollte im Abluftkanal montiert
werden und kann in Verbindung mit verschiedenen Arten von Beutel-, Keramik-, Kerzen­oder Zyklonltern verwendet werden. Bei der Erstmontage des PMT2 eine Messung der

Grundlinie vornehmen und den Wert festhalten. Dieser Messwert richtet sich nach der
Anwendung und muss bei jeder Installation einzeln ermittelt werden. Auf der Grundlage
dieses Werts überwacht der Bediener das Ausgabesignal des PMT2. Ein Anstieg beim
mA-Wert des Ausgangssignals deutet auf einen erhöhten Partikelgehalt im Luftstrom
hin, weil die Filter entweder abgenutzt oder defekt sind.

Der PMT2 ist für ein proportionales Ausgabesignal auf der Grundlage des Partikelpegels
in Rohren und Leitungen ausgelegt, nicht jedoch für ein Ausgabesignal auf der Grundlage
des Partikelvolumenstroms. Verschiedene Partikelarten transportieren unterschiedliche

Ladungen, so dass zwei Partikel, die sich mit derselben Durchussgeschwindigkeit

bewegen, zwei verschiedene Ausgabesignale erzeugen können. Der PMT2 wurde

dazu entwickelt, unter idealen Betriebsbedingungen eine Grundlinie zu nden und

dem Bediener die Möglichkeit zu geben, das Ausgangssignal auf einen Anstieg zu
kontrollieren, die darauf hinweist, dass die Beutel oder Filter sich allmählich abnutzen

oder Schäden aufweisen. Durch die sechs Empndlicheitsstufen lassen sich mit dem

PMT2 sowohl Partikel mit niedriger als auch mit hoher Ladung überwachen. Zur

Orientierung sind in Tabelle 1 die Ladungseigenschaften und die empfohlenen Stufen

aufgeführt.

MONTAGE
Auspacken

Den PMT2 aus dem Versandkarton nehmen und auf Schäden untersuchen. Bei

eventuellen Schäden den Spediteur umgehend in Kenntnis setzen.

Montagestelle

Bei der Auswahl der Stelle, an der der PMT2 installiert werden soll, sind folgende
Punkte zu beachten:

• Darauf achten, dass der Transmitter für die Umgebung eingestuft ist, in der er
montiert werden soll.

• Den Transmitter an einer Stelle montieren, an der die in den technischen Daten
aufgeführten Temperatur- und Druckwerte nicht überschritten werden. Der
Prozessdruck darf 2 Bar (30 psi) nicht überschreiten.

• Darauf achten, dass die Signalkabel für 4 bis 20 mA nicht durch die gleiche Leitung
verlaufen wie die Starkstromkabel.

• Darauf achten, dass die Stelle, an der der Transmitter angebracht wird, den NEMA­oder IP-Betriebswert für das Gehäuse erfüllt.

• Den Transmitter an einer Stelle anbringen, wo er im Wartungsfall erreichbar ist.

Der PMT2 sollte in einem geerdeten Metallschacht, -rohr oder einer geerdeten
Metallleitung montiert werden. Nicht an Schächten, Rohren oder Leitungen aus

Glasfaser oder Kunststoff anbringen. Zur Gewährleistung einer genauen Messung

muss die Sonde 1/2 bis 2/3 über den Schacht, das Rohr oder die Leitung reichen.
Am stabilsten und genausten sind die Messwerte, wenn der PMT2 an einer Stelle
montiert wird, an der der Luftstrom möglichst laminar ist. Den Transmitter möglichst
nicht in der Nähe von Ventilatoren und Luftklappen montieren, die Turbulenzen
verursachen. Idealerweise sollte der PMT2 in einem Bereich mit zwei vorgelagerten
Rohrdurchmessern und einem nachgelagerten Rohrdurchmesser montiert werden,
die frei von Turbulenzen hervorrufenden Gegenständen sind. Die Sensorsonde ist mit
einem haftabweisenden PTFE beschichtet, so dass kein Material an der Sonde haften
bleibt, wodurch sich der Reinigungs- und Luftspülaufwand verringert.

neutral

Partikel Empfohlene Stufe

Menschenhände
Asbest

Kaninchenfell

Azetat
Glas
Glimmer
Menschenhaar

Nylon

positivnegativ

Holz
Fell
Blei
Seide

Aluminium
Papier

Baumwolle

Stahl
Holz

Mylar™

Nickel / Kupfer

Silber / Messing
Gold / Platin
Schwefel

Azetatseide
Polyester
Styren (Styropor)
Acryl
Saran™
Polyurethan

Polyethylen
Polypropylen
Vinyl (PVC)
Silikon
PTFE
Silikonkautschuk

Tabelle 1: empfohlene Stufen

5 bis 5000 pA

5 bis 1000 pA

5 bis 500 pA

5 bis 100 pA

5 bis 500 pA

5 bis 1000 pA

5 bis 5000 pA