PKP DTL04 User manual

Instruction Manual
DTL04
Calorimetric flow sensor
for air -switching output-
PKP Prozessmesstechnik GmbH
Borsigstraße 24
D-65205 Wiesbaden- ordenstadt
Tel.: ++49-(0)6122-7055-0
Fax: ++49-(0)6122-7055-50
Email: [e-mail]

Table of Contents
Safety Information..................................................................................................................2
Functional Description...........................................................................................................3
Installation..............................................................................................................................3
Electrical Connection.............................................................................................................4
Switching Point Adjustment...................................................................................................5
Commissioning.......................................................................................................................6
Maintenance and Care...........................................................................................................6
Troubleshooting.....................................................................................................................6
Safety Information
General Instructions
To ensure safe operation, the device should only be operated according to the specifica-
tions in the instruction manual. The requisite Health & Safety regulations for a given appli-
cation must also be observed. This statement also applies to the use of accessories.
Every person who is commissioned with the initiation or operation of this device must have
read and understood the operating instructions and in particular the safety instructions!
The liability of the manufacturer expires in the event of damage due to improper use, non-
observance of this operating manual, use of insufficiently qualified personnel and unau-
thorized modification of the device.
roper Usage
The calorimetric compact flowmeters type DTL04 are used for monitoring air flows. Any
other use of the device is prohibited and outside the scope of application.
In particular, applications in which shock loads occur (for example, pulsed operation)
should be discussed and checked in advance with our technical staff.
The series DTL04 flow meter devices should not be deployed as the sole agents to pre-
vent dangerous conditions occurring in plant or machinery. Machinery and plant need to
be designed in such a manner that faulty conditions and malfunctions do not arise that
could pose a safety risk for operators.
Dangerous substances
For dangerous media such as e.g. Oxygen, Acetylene, flammable or toxic substances as
well as refrigeration systems, compressors, etc. must comply with the relevant regulations
beyond the general rules.
DTL04 Instruction manual 07/2019 page 2

Qualified ersonnel
The DTL04 devices may only be installed by trained, qualified personnel who are able to
mount the devices correctly. Qualified personnel are persons, who are familiar with
assembling, installation, placing in service and operating these devices and who are suit-
ably trained and qualified.
Inward Monitoring
Please check directly after delivery the device for any transport damages and deficiencies.
Additional with reference to the accompanying delivery note the number of parts must be
checked.
Claims for replacement or goods which relate to transport damage can only be considered
valid if the delivery company is notified without delay.
Functional Description
The flow monitors of the type series DTL04 operate according to the calorimetric principle.
The devices switch when a set threshold value is reached. With the calorimetric measur-
ing principle, a temperature-sensitive resistance is heated. The heating process is carried
out by a separate heating resistor.
A flow in the medium dissipates heat from the measuring resistor, the temperature of the
resistor changes and so does its resistance value. This change is evaluated.
However, not only the velocity of the flowing medium, but also its temperature has an
influence on the amount of heat dissipated, so a relation between flow and temperature
must be established. This is done via a second temperature-dependent measuring resistor
in the vicinity of the first one. The second measuring resistor (temperature compensation)
is not heated and is only used for temperature measurement.
Installation
In order to avoid malfunctions, the following points must be observed:
•The mounting is simple and quick via a flange mounting (for duct mounting) or via
the PG7 or 1/2” threaded connection piece.
•The sensor tip should be located in the middle of the pipe if possible. The gaseous
medium must flow through the transverse hole in the sensor shaft.
•The marking serves as a mounting aid. Align the sensor tube exactly in the duct!
•If the pipes are installed vertically, the direction of flow should be from bottom to
top.
•Observe free inlet distance 5xD (pipe diameter) before the sensor and 3xD outlet
distance after the sensor.
•Screw in the flow monitor only over the hexagon of the sensor housing.
•The flow monitor is independent of the mounting position.
•Optimum measurement results can only be achieved with an optimum installation
arrangement while maintaining the inlet and outlet distances!
DTL04 Instruction manual 07/2019 page 3

Electrical Connection
Attention: Before the electrical connection of the device, it must be ensured that the sup-
ply voltage corresponds to the required one and that the supply voltage is switched off.
•The general VDE regulations (VDE0100, VDE0113, VDE0160) must always be
observed for the electrical installation.
•If a safety extra-low voltage is applied to the potential-free contact, care must be
taken to ensure sufficient insulation of the connecting cables up to the terminal
point, otherwise the double insulation on the mains voltage side will be impaired.
•The electrical connection is made via the terminals in the connection head.
•The exact pin assignment can be found in the drawings.
Relay:
Transistor:
Option plug connector M8:
PIN Color Connection
1 brown +UV
2 white G D
3 black contact 13 /O (S)
4 blue contact 14 /O (G D)
DTL04 Instruction manual 07/2019 page 4

Switching oint Adjustment
The switching point can be selected steplessly via an integrated potentiometer. The tran-
sistor output (or closing contact for relay outputs) is switched through when flow is present
(yellow LED in the device lights up). Temperature fluctuations of the medium to be moni -
tored are compensated by temperature compensation.
The relationship between air velocity and resistance change is not linear. In the lower
range (small flows) the change of the resistance is very large. In the upper range, the
change in resistance becomes less and less with the same flow changes.
When setting the switching point, the change to be monitored should be taken into
account, as different settings have certain disadvantages.
The following requirements shall e considered:
Low flow change in the high flow velocity range
The switching point must be selected very close to the measured value of the normal flow,
since the change in measured value is very small when the flow changes. Since the tem -
perature compensation has a certain delay compared to the actual temperature change,
such a switching point adjustment only makes sense for applications with slow tempera -
ture changes.
Low flow change in the low flow velocity range:
The switching point can be selected at a greater distance from the measured value of the
normal flow, since the change in measured value is large when the flow changes. A tem-
perature change has no effect on the switching behaviour.
Big flow change:
Here a yes / no statement is usually desired (e.g. fan running or fan stopped). A safety
distance can therefore be selected which is so large that neither temperature changes nor
turbulence have any influence on the switching behaviour.
DTL04 Instruction manual 07/2019 page 5

Commissioning
The following procedure is advisable for commissioning and setting the devices:
1. Install the device
2. Connect the device according to the wiring instructions.
3. Set trimmer “Sensitivity” to minimum sensitivity (left stop).
4. Apply mains voltage; the device is immediately ready for operation.
5. Switch on the flow generator.
6. Turn trimmer “Sensitivity” slowly towards maximum until the yellow LED lights up
and the transistor output switches through (with DTL04.R relay output the output
relay switches into on-position). In order to achieve stable switching conditions, you
should turn slightly above the switching point.
7. To check the flow monitoring, reduce or switch off the flow generation. The yellow
LED goes out (the output relay at DTL04.R drops out).
Flow ≥ threshold Signal output switches Yellow LED airflow lights up
Flow < threshold Signal output not switched Yellow LED airflow noes not light
up
Maintenance and Care
The calorimetric flow monitors described here are basically maintenance-free. They do not
contain any components that have to be repaired or replaced on site. Repairs are only
carried out at the manufacturer´s works.
If the sensor becomes dirty, it should be cleaned carefully with water at regular intervals.
Troubleshooting
Pro lem Cause Solution
Device does not work at all o or wrong mains voltage
connected
Check mains voltage and con-
nection
Device does not detect flow Sensor is not installed correctly Check installation conditions
Device has changed response
behaviour
Sensor is heavily contaminated
by the medium
Carefully clean the sensor with
water
Device switches when the tem-
perature of the medium rises
rapidly
Temperature gradient is out-
side the technical data
Turn potentiometer “Sensitivity”
slightly further clockwise.
Check the temperature gradi-
ent of the system
DTL04 Instruction manual 07/2019 page 6

Flow Measurement and Monitoring
DTL04
Calorimetric Compact
Flow Sensor for Air
-Switching Output-
•rela or transistor output
•measuring range: 0,1...15 m/s
•max. pressure: 10 bar
•max. temperature: 80 °C
•insignificant pressure loss
•no moving parts
•independent of nominal sizes, pressure
and temperature
Description:
The air flow sensor operate according to the proven calori-
metric principle. A temperature-independent resistor at the
sensor tip is electronically heated. The flowing air withdraws
heat from it, which changes the resistance value. A second
unheated resistor is used to measure the medium tempera-
ture.
The temperature difference of both resistors is proportional to
the flow velocity and thus to the volume flow. The switching
point of the DTL04 is easily ad usted by an built-in poten-
tiometer.
Typical applications:
The DTL04 calorimetric flow sensors are characterised by
their particularly good price-performance ratio. The devices
are used wherever laminar air flows have to be monitored: For
example in building services engineering, exhaust and supply
air control, filter monitoring, compressor monitoring, leakage
monitoring, cooling circuits etc.
PKP Prozessmesstechnik GmbH
Borsigstr. 24 • D-65205 Wiesbaden
S [phone] • T [phone]
[email protected] • www.pkp.de
20181128

Models:
DTL04.R... 1 relay output
DTL04.T... 1 transistor output
Technical Data:
Meas ring range 0,1...15 m/s
Relay o tp t
current / capacity:
min. switching capacity:
function at flow:
display at flow:
1 N/O
250 VAC, 5 A, 1,2 kVA
10 mA, 5 VDC
relay picks up
yellow LED
Transistor o tp t:
display at flow:
PNP, max. 150 mA
yellow LED
Operating voltage: 24 VAC/DC, +/- 5%
Power inp t: 1 VA
Temperat re range:
Environment:
Medium:
−20 … +60 °C
−10 … +80 °C
Temperat re gradient: 15 K/min
(optional 30 K/min)
Compression strength: 10 bar
Process connection: PG 7
mounting flange
G ½ reduction
Immersion depth: 50 mm
140 mm (optional)
Sensor material: MS58 nickel plated
(optional stainless steel)
Protection cl. (ho sing): IP65
Protection cl. (sensor): IP67
Acc racy*: +/- 5 % F.S.
Reprod cibility of the
o tp t signal: +/- 3 %
* reference conditions: 20 °C, 48 % RH, 1016 mbar
Electrical connection:
Relay:
Transistor:
Order Code:
Order n mber: DTL04.
Calorimetric compact flow sensor
for air – switching o tp t-
R. 15. 1. K. 0
Models:
R = relay output
T = transistor output
Meas ring range:
15 = 0,1...15 m/s
Process connection:
1 = PG7 thread (standard)
2 = mounting flange
3 = G ½ reduction
Immersion depth:
K = ca. 50 mm (standard)
L = ca. 140 mm
Options:
0 = without
9 = please specify in plain text
Dimensions:
PKP Prozessmesstechnik GmbH
Borsigstr. 24 • D-65205 Wiesbaden
S [phone] • T [phone]
[email protected] • www.pkp.de
Flow