No part of this document may be
reproduced, published or publicly
displayed in any form or by any means,
electronic or mechanical (including
photocopying), nor may its contents be
modified, translated, adapted, sold or
disclosed to a third party without prior
written permission of the copyright holder.
Translated documents and translated
portions of multilingual documents are
based on the original English versions. In
ambiguous cases, the English versions are
applicable, not the translations.
The contents of this document are subject
to change without prior notice.
Local rules and regulations may vary and
they shall take precedence over the
information contained in this document.
Vaisala makes no representations on this
document’s compliance with the local
rules and regulations applicable at any
given time, and hereby disclaims any and
all responsibilities related thereto.
This document does not create any legally
binding obligations for Vaisala towards
customers or end users. All legally binding
obligations and agreements are included
exclusively in the applicable supply
contract or the General Conditions of Sale
and General Conditions of Service of
Vaisala.
This product contains software developed
by Vaisala or third parties. Use of the
software is governed by license terms and
conditions included in the applicable
supply contract or, in the absence of
separate license terms and conditions, by
the General License Conditions of Vaisala
Group.
DMP series probes are dew point and temperature measurement probes with a digital output
(Modbus protocol). The probes are designed for demanding dew point measurement
applications. The probes have a two-part structure, with measurement electronics contained in
the probe body and sensor(s) in the probe head. The probe body and the probe head are
connected by a cable. Length options for this connecting cable depend on the probe model.
The probes are compatible with Vaisala Indigo transmitters. They can also be connected to
Vaisala Insight software for configuration, calibration, diagnostics, and temporary online
monitoring.
Probe Structure
Figure 1 Probe Parts
1Protection cap (remove before use)
25-pin M12 connector
3Probe body with type label
4Status indicator:
GreenPower on and probe online,
RedError
OPower o or indicator
5Probe cable (do not cut)
6Probe head (DMP7 model shown)
7Location of sensors on the probe head.
DMP series probes have a removable
filter over the sensors that can be
replaced if it gets dirty or damaged.
8Protection cap (remove before use)
Basic Features and Options
• Comprehensive list of output parameters. For example: relative humidity, temperature,
dew point temperature, wet-bulb temperature, absolute humidity, mixing ratio, water
vapor pressure, enthalpy. See Output Parameters (page 4).
• Sensor purge provides superior chemical resistance
• Sensor warming function minimizes condensation on sensor
• Traceable calibration certificate
• Standalone Modbus RTU over RS-485
• Compatible with Indigo series of transmitters
• Can be connected to Vaisala Insight PC software for configuration, calibration,
diagnostics, and temporary online monitoring
flashes when communicating
disabled
3
Page 6
Output Parameters
Values of all available output parameters are always locked (showing the latest
valid value) when chemical purge, autocalibration, or extra heat functions are
active.
Output parameter is available
Output parameter is unavailable during sensor warming unless temperature is written to
register 0334
Output parameter is not available on this model
Table 1 Availability of Output Parameters
Output ParameterOutput UnitDMP5DMP6DMP7DMP8
Relative humidity%RH
Temperature°C
Dew point temperature°C
Dew/frost point temperature°C
Dew/frost point temperature at
1 atm
Dew point temperature at 1 atm °C
Absolute humidity
Mixing ratiog/kg
Water concentrationppm
Water vapor pressurehPa
Water vapor saturation
pressure
EnthalpykJ/kg
Dew point temperature
dierence
Absolute humidity at NTP
Water mass fractionppm
from an external source
hex
°C
3
g/m
v
hPa
°C
3
g/m
w
4M212356EN-A
Page 7
Installation
1
2
3
4
When you choose the installation location for the probe, consider the following:
• Verify the operating environment specification of the probe model. The probe head
typically has a much wider operating temperature range than the probe body.
• If the temperature of the measured environment diers greatly from ambient
temperature, the entire probe head and preferably plenty of cable must be inside the
measured environment. This prevents measurement inaccuracy caused by heat
conduction along the cable.
• Probe mounting options are model-specific.
Figure 2 Example Installation
Mount the probe head horizontally to prevent any water condensing on the probe head
1
from running to the sensors.
2Let the cable hang loosely to prevent condensed water from running along the cable to
the probe body or probe head.
3Attach the probe body to a wall or other surface using the two mounting clips (Vaisala
item 243257SP) supplied with the probe. Each clip attaches to the installation surface with
one screw (screw hole Ø 4.2 mm).
4Cable to Modbus master or Indigo transmitter.
CAUTION!
vibration. Use other methods to secure the probe body if necessary. For
example, attach the probe body using a cable tie.
The supplied mounting clips are not designed to withstand strong
5
Page 8
DMP5 Probe
mm
[in]
136 [5.35]
Ø 25
[0.98]
M12/5
41 [1.61]
242 [9.53]
192 [7.56]
Ø 12
[0.47]
Ø 13.5
[0.53]
Ø 5
[0.2]
Probe cable
2 m [6.56 ft] or 10 m [32.8 ft]
Figure 3 DMP5 Dimensions
Vaisala DRYCAPâ Dew Point and Temperature Probe DMP5 is designed for humidity
measurement in applications with high temperatures. The long and robust steel probe and an
optional installation flange allow easy installation with adjustable depth through insulation, for
example, in ovens.
DMP5 is built for direct measurement in hot and dry processes, up to +180 °C (+356 °F). As the
probe can be directly placed in the process, there is no need for a sampling system or trace
heating. As a result, high measurement accuracy and constancy are maintained. DMP5
provides unmatched dry-end measurement accuracy at temperatures up to 140 °C; however, it
can operate safely at temperatures up to 180 °C.
• Operating temperature of probe body −40 … +80 °C (−40 … +176 °F)
• Operating temperature of probe head −40 ... +180 °C (−40 ... +356 °F)
6M212356EN-A
Page 9
Installing with Mounting Flange 210696
75 [2.95]
50 [1.97]
Drilling 16 ... 22
[0.63 ... 0.87]
105 ... 200 [4.1 ... 7.87]
1
2
3
4
5
mm
[in]
Mounting flange 210696 is designed for attaching Ø13.5 mm probe heads through the wall of a
process chamber or duct. The flange kit includes a flange, a sealing ring, and screws.
1Wall of chamber or duct
2Flange
3Sealing ring
4Self-tapping screws (B 4.2×16 DIN 7981)
5Probe
When the temperature dierence between the process or duct and the
surroundings is large, insert the probe head as deep in the process or duct as
possible. This prevents errors caused by heat conduction along the probe cable.
7
Page 10
DMP6 Probe
136 [5.35]
Ø 25
[0.98]
M12/5
357 [14.1]
334.5 [13.17]
Ø 11
[0.43]
Probe cable 2 m [6.56 ft]
Ø 5
[0.2]
mm
[in]
304 [11.97]
164 [6.46]112.5 [4.43]
15 [0.59]
8 [0.31]
27.5
[1.08]
40.6 [1.6]
Cooling fins
120 [4.72]
Ø 20 [0.79]
Ø 89 [3.5]
Ø 118 [4.65]
Mounting flange
Ø28 [1.1]
Ø 89 [3.5]
Screen tube
mm
[in]
Figure 4 DMP6 Probe Dimensions
Figure 5 Cooling Set DMP246CS Dimensions
8M212356EN-A
Page 11
Vaisala DRYCAPâ Dew Point Probe DMP6 is designed for humidity measurement in industrial
100
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
150200250300350
Temperature of measured gas (°C)
Dew point temperature (°C)
Range without cooling fins
Range with cooling fins
applications with very high temperatures. High temperature tolerance is achieved using a
passive cooling set that conducts heat away from the probe and reduces temperature to
optimal range for the sensor.
• Operating temperature of probe head 0 … +350 °C (+32 ... +662 °F)
• Operating temperature of probe body −40 … +80 °C (−40 … +176 °F)
DMP6 is built for direct measurement in temperature range 0 … +350 °C (+32 … +662 °F).
There is no need for a sampling system or trace heating. To tolerate these high temperatures
the probe head is inserted inside a cooling set that provides passive cooling. The cooling set
has removable cooling fins that allow the operating temperature profile of the probe to be
adjusted so that adequate cooling is provided for each application. The cooling system has no
moving parts, and requires no additional power or cooling utilities, so there is no risk of sensor
damage due to mechanical cooling failure.
Figure 6 Operating Range of Probe Head
Make sure that the upper limit of the dew point measurement range is not
exceeded in low temperatures as this will lead to condensation.
You can read diagnostic measurement data from the probe using Insight software
(Diagnostics page) or Modbus protocol (diagnostic data registers) and use it to
verify your installation:
• Sensor temperature must never exceed +180 °C (+356 °F) even in exceptional
process conditions.
• Allow the probe to stabilize after installation in the cooling set, and check the
Sensor saturation ratio. If the value is below 20 %, install the cooling fins on
the cooling set (unless already installed).
9
Page 12
Installing Probe Head with Cooling Set DMP246CS
mm
[in]
Ø 105 [4.13]
max.
50 [1.97]125 [4.92]
8 [0.31]
2
[0.08]
Ø 89 [3.50]
Ø 118 [4.65]
1234
• Welding equipment
• Equipment for making a hole to the process wall
• 5-mm Allen key
• 2-mm Allen key
Figure 7 DMP246CS Cooling Set Mounting Flange
Lengthening piece for thick walls (not included)
1
2Welding point
3Mounting tube
4Mounting screws (4 pcs, M6×16 DIN 912)
10M212356EN-A
Page 13
172 [6.77]22 [0.87]104.5 [4.11]
12345
mm
[in]
Figure 8 DMP246CS Cooling Set without Mounting Flange
1Cooling bush
2Flange
3Cooling bar
4Locking screws (4 pcs, M4×6 DIN 916)
5Mounting screws of the cooling fins (M6×60 DIN 912
1. Make a round 89.5 + 0.5 mm (3.52 + 0.02 in) hole in the process wall. Install the cooling
set horizontally whenever possible to ensure the best possible cooling performance.
2. If the process wall is more than 125 mm (4.92 in) thick, weld a lengthening piece (max. 50
mm (1.97 in)) to the mounting tube.
3. Weld the tube of the mounting flange tightly to the inner metal plate of the process wall.
4. Attach the cooling set to the mounting flange and use a 5-mm Allen key to tighten the
mounting screws. Proper tightening of the mounting screws is important for good thermal
contact.
5. If the process chamber is in use or otherwise warmer than ambient temperature, let the
cooling set warm up before inserting the probe to avoid condensation:
a. Plug the hole of the cooling bar tightly with the plug that is attached to the cooling
set.
b. If installation of the cooling fins is required, attach them at this point to let them warm
up as well. See step 9.
c. Wait for a few hours.
d. Unplug the cooling bar and continue the installation.
6. Use a 2-mm Allen key to loosen the locking screws on the cooling bar.
7. Push the probe head into the cooling bar until it meets the other end and cannot be
pushed farther. Approximately 7.5 cm (2.95 in) of the probe head will remain outside the
cooling bar.
Do not push or pull from the probe cable.CAUTION!
11
Page 14
8. Tighten the locking screws to lock the probe head in place.
5
6
123
4
9. If installation of cooling fins is required, attach them around the cooling bar using a 5-mm
Allen key. Place the cooling fins so that the locking screws are not obstructed. Tighten the
two mounting screws so that the fins have good thermal contact with the cooling bar.
Cooling Set Installation Example
Figure 9 Example Installation with Cooling Set DMP246CS
Process chamber, maximum temperature +350 °C (+662 °F)
1
2Mineral wool or other insulation, total wall thickness is < 125 mm (4.92 in) so no
lengthening piece is welded to mounting tube
3Space outside process chamber, in ambient temperature
4Location of dew point sensor when probe head is installed in the cooling set (under
sintered filter)
5Tube of the mounting flange welded to inner plate of process wall
6Cooling set attached to mounting flange using mounting screws (4 pcs)
12M212356EN-A
Page 15
DMP7 Probe
136 [5.35]
Ø 25
[0.98]
M12/5
41 [1.61]
84 [3.31]
Hex 22 [0.87]
Probe cable
2 m [6.56 ft] or 10 m [32.8 ft]
Ø 12
[0.47]
ISO 1/2”
ISO 3/8”
or NPT 1/2”
mm
[in]
Figure 10 DMP7 Dimensions
Vaisala DRYCAPâ Dew Point and Temperature Probe DMP7 is designed for low-humidity
applications. Thanks to its short probe length, it fits in installations with limited space such as
semiconductor manufacturing equipment. Other applications include industrial drying,
compressed air systems, dry rooms, and blanket gases in metal heat treatment.
• Operating temperature of probe head −40 … +80 °C (−40 … +176 °F)
• Operating temperature of probe body −40 … +80 °C (−40 … +176 °F)
• Operating pressure of probe head 0 … 10 bar (0 … 145 psia)
13
Page 16
See installation instructions provided with the Swagelok installation kit.
mm
[in]
213456
42 [1.65]
84 [3.31]
Figure 11 DMP7 Installation to Pipeline Using a Swagelok Installation Kit
1Max. process pressure 10 bar (145 psi), max temperature +80 °C (+176 °F)
2Probe head
3Duct connector
4ISO1/2", ISO3/8" or NPT1/2" thread
5Swagelok connector
6Ferrules
When installed in a process with a pressure diering from normal atmospheric
pressure, input the correct pressure into the pressure compensation setpoint
register of the probe. This allows the probe to apply the appropriate pressure
compensation into its measurement results.
More Information
‣
Configuration Registers (page 25)
14M212356EN-A
Page 17
DMP8 Probe
136 [5.35]
Probe cable 2 m [6.56 ft]
Ø 25
[0.98]
M12/5
Ø 12
[0.47]
41 [1.61]
Ø 13.5
[0.53]
Fitting body
ISO1/2” or NPT1/2”
Ø 5
[0.2]
mm
[in]
268 [10.55]
230 [9.06]
41 ... 185 [1.16 ... 7.28]
Figure 12 DMP8 Dimensions
Vaisala DRYCAPâ Dew Point and Temperature Probe DMP8 is designed for industrial lowhumidity applications such as industrial drying, compressed air systems, and semiconductor
industry. It can be installed in a 1/2" NPT or ISO thread with adjustable insertion depth.
An optional ball-valve installation kit allows for inserting or detaching the probe from a
pressurized line.
• Operating temperature of probe head −40 … +80 °C (−40 … +176 °F)
• Operating temperature of probe body −40 … +80 °C (−40 … +176 °F)
• Operating pressure of probe head 0 … 4 MPa (0 … 40 bar)
15
Page 18
1
2
3
Figure 13 DMP8 Probe Head
1
2
1Clasp nut, 24 mm hex nut
2Fitting body, 27 mm hex head
3Leak screw (on ISO 1/2" fitting body
HM47432 only)
Fitting body with a leak screw can be useful when the probe head cannot be
installed directly in the pressurized process or process pipe. The leak screw allows
a small sample flow to escape from the process out to atmospheric pressure,
enabling a fast response time although the probe is not installed in the process.
Figure 14 Sealing of Fitting Body into
Process
1Fitting body with 24 mm hex nut and
tapered thread
2Seal with a suitable thread sealant. For
example, LOCTITEâ No. 542 with
activator No. 7649, MEGA-PIPE EXTRA
No. 7188, or PTFE tape.
Follow the instructions of the sealant manufacturer.
PTFE tape does not lock the parts together. Use two fork wrenches (24 mm and
27 mm) when tightening and opening the clasp nut of the probe.
16M212356EN-A
Page 19
Tightening the Clasp Nut
1. Adjust the probe to a suitable depth according to the type of installation.
2. Tighten the clasp nut to finger tightness.
3. Draw a line on the fitting screw and the clasp nut to mark their position.
4. Tighten the nut a further 50 … 60º (1/6 turn) with a wrench. If you have a suitable torque
wrench, tighten the nut to max 45 ±5 Nm (33 ±4 ft-lbs).
Do not overtighten the clasp nut.
CAUTION!
the probe less tight and may prevent it from going through the clasp nut.
CAUTION!
nuts and screws very carefully to prevent loosening of the probe by the action of
pressure.
When installed in a process with a pressure diering from normal atmospheric
pressure, input the correct pressure into the pressure compensation setpoint
register of the probe. This allows the probe to apply the appropriate pressure
compensation into its measurement results.
More Information
‣
Configuration Registers (page 25)
Take care not to damage the probe body. A damaged body makes
In pressurized processes it is essential to tighten the supporting
17
Page 20
Attaching Ball Valve Kit to Process
G1/2
ISO 228/1
Ø21.5 (drilling)
Ø14
Ø14
Ø14
2
3
4
5
1
1Ball valve handle: must point to the same direction as the ball valve body when installing.
2Extension nipple, threads G1/2 ISO228/1 and R1/2 ISO7/1.
3Ball valve body. When tightening the assembly, turn only from the ball valve body.
4Ball of the ball valve.
5Welding joint, threads R1/2 ISO7/1.
1. Attach the welding joint to the process pipe or chamber.
2. Apply a sealant (MEGA-PIPE EXTRA No. 7188 or LOCTITEâ No. 542 with activator No.
7649) on the threads of the welding joint and screw the bottom of the ball valve onto the
welding joint.
18M212356EN-A
Page 21
3. Tighten the ball valve assembly by turning from the ball valve body.
CAUTION!
Tightening the ball valve kit by turning the extension nipple
can break the sealing. Tighten the ball valve assembly only from the ball
valve body.
4. If you need to cap the ball valve assembly before installing or after removing the probe,
attach a blanking nut to close the top of the valve.
19
Page 22
Wiring
1
534
2
RS-485 host
DC power supply
RS-485 +
RS-485 -
RS-485 common
+
-
Pin #1
Power supply
Pin #2
RS-485 -
Pin #3
Power GND
RS-485 common
Pin #4
RS-485 +
Pin #5
Probe
Figure 15 M12 5-pin A-coded Male Connector Pinout
Pin #FunctionNotesWire Colors in Vaisala
1Power supplyOperating voltage: 15 ... 30 VDC
Cables
Brown
Current consumption: 10 mA typical,
500 mA max.
2RS-485 -White
3Power GND and
Blue
RS-485 common
4RS-485 +Black
5Not connectedGray
Figure 16 RS-485 Wiring
20M212356EN-A
Recommended maximum length of the RS-485 line is 30 m (98 ft).
Page 23
Attaching Probe to Indigo 200 Series
Transmitter
Figure 17 Attaching the Probe to Indigo 200 Series
1. Insert the probe or the connection cable into the transmitter's connector. Use of
connection cable is recommended for strain relief.
2. Turn the locking wheel of the transmitter to lock the probe or cable in place.
Do not turn the probe or the cable itself, as that will damage the connectors.
3. If you are using a connection cable, connect the probe to the cable.
4. When the transmitter recognizes the connected probe, it shows a notification message on
the display.
21
Page 24
Vaisala Insight Software
Vaisala Insight software is a configuration software for Indigo-compatible devices. With the
Insight software, you can:
• See probe information and status
• See real-time measurement
• Record data up to 48 hours and export in CSV format
• Calibrate and adjust the probe
• Configure probe features such as measurement filtering, chemical purge, and serial
communication
Microsoft Windowsâ operating system and Vaisala USB cable (no. 242659) required.
Download Vaisala Insight software at www.vaisala.com/insight.
Connecting to Insight Software
• Computer with Microsoft Windowsâ operating system and Vaisala Insight
software installed
• USB connection cable (no. 242659)
CAUTION!
computer may not be able to supply enough power through its USB ports. Use
an externally powered USB hub that can supply >2 W for each port.
Figure 18 Connecting Probe to Insight
1. Open Insight software.
2. Connect the USB cable to a free USB port on the PC or USB hub.
3. Connect the probe to the USB cable.
4. Wait for Insight software to detect the probe.
When connecting several devices at the same time, note that your
22M212356EN-A
Page 25
Modbus
Default Communication Settings
Table 2 Default Modbus Serial Communication Settings
PropertyDescription/Value
Serial bit rate19200
ParityNone
Number of data bits8
Number of stop bits2
Flow controlNone
Modbus device address240
You can use up to ten probes on the same RS-485 line. You must configure each probe on the
line to have a dierent Modbus address.
Measurement Data Registers
Measurement data is also available as integer registers. See DMP Series User Guide
(M212357EN) available at www.vaisala.com.
Table 3 Floating Point Measurement Data Registers (Read-Only)
Register
Number
(Decimal)
Address
(Hexadecimal)
10000
0001
30002
0003
70006
0007
90008
0009
11000A
000B
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
Register DescriptionData FormatUnit
Relative humidity32-bit float%RH
Temperature32-bit float°C
Dew point temperature32-bit float°C
Dew/frost point
32-bit float°C
temperature
Dew/frost point
32-bit float°C
temperature at 1 atm
23
Page 26
Register
Number
Address
(Hexadecimal)
(Decimal)
13000C
000D
15000E
000F
170010
0011
210014
0015
230016
0017
250018
0019
27001A
001B
31001E
001F
330020
0021
650040
0041
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
hex
Register DescriptionData FormatUnit
Dew point temperature
32-bit float°C
at 1 atm
Absolute humidity32-bit float
g/m
Mixing ratio32-bit floatg/kg
Water concentration32-bit floatppm
Water vapor pressure32-bit floathPa
Water vapor saturation
32-bit floathPa
pressure
Enthalpy32-bit floatkJ/kg
Dew point temperature
32-bit float°C
dierence
Absolute humidity at
32-bit float
g/m
NTP
Water mass fraction32-bit floatppm
3
v
3
w
Diagnostic Data Registers
Table 4 Floating Point Diagnostic Data Registers (Read-Only)
Register
Number
(Decimal)
370024
390026
24M212356EN-A
Address
(Hexadecimal)
hex
0025
hex
hex
0027
hex
Register DescriptionData FormatUnit
Sensor saturation ratio32-bit float%
Sensor temperature32-bit float°C
Page 27
Configuration Registers
The configuration registers listed here are the most important for typical users. For more
information on available configuration registers, see DMP Series User Guide (M212357EN)
available at www.vaisala.com.
Table 5 Modbus Configuration Data Registers (Writable)
Register
Number
(Decimal)
Compensation Setpoints
7690300
8210334
Register
Address
(Hexadecim
al)
hex
0301
hex
hex
0335
hex
Register DescriptionData
Pressure compensation
Format
32-bit floatUnit: hPA
setpoint
Temperature
32-bit floatUnit: °C
compensation setpoint. If
a value is written to this
Unit / Valid Range
Default: 1013.25 hPa
register, probe uses it
instead of its own
temperature
measurement.
Communication
15370600
Modbus address16-bit
hex
integer
1 ... 247
Default: 240
Test Value Registers
Read the known test values from the test registers to verify the functionality of your Modbus
implementation.
Table 6 Modbus Test Registers (Read-Only)
Register Number
(Decimal)
Register Address
(Hexadecimal)
79371F00
79381F01
1F02
79401F03
1F04
1F05
1F06
hex
hex
hex
hex
hex
hex
hex
Register
Description
Signed integer
Data FormatTest Value
16-bit integer-12345
test
Floating point
32-bit float-123.45
test
Text string testtextText string
"-123.45"
25
Page 28
Technical Support
Contact Vaisala technical support at helpdesk@vaisala.com. Provide at least the
following supporting information as applicable:
• Product name, model, and serial number
• Software/Firmware version
• Name and location of the installation site
• Name and contact information of a technical person who can provide further
information on the problem
For more information, see www.vaisala.com/support.
More Information
For detailed instructions for installing, configuring, and maintaining the probes, see DMP
Series User Guide (M212357EN) available at www.vaisala.com.
Warranty
For standard warranty terms and conditions, see www.vaisala.com/warranty.
Please observe that any such warranty may not be valid in case of damage due to normal wear
and tear, exceptional operating conditions, negligent handling or installation, or unauthorized
modifications. Please see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.
Recycling
Recycle all applicable material.
Follow the statutory regulations for disposing of the product and packaging.
26M212356EN-A
Page 29
Page 30
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