PCE Instruments PCE-P18-0A0E0, PCE-P18-1A0E0, PCE-P18L Users guide

TEMPERATURE
AND HUMIDITY
TRANSDUCER

PCE-P18

PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[e-mail]
www.pce-instruments.com/us

www.industrial-needs.com

PCE Instruments UK Ltd.

Units 12/13

Southpoint Business Park

Ensign way

Hampshire / Southampton

United Kingdom, SO31 4RF

From outside UK: +44

Tel: [phone]

Fax: [phone]

[e-mail]

www.pce-instruments.com/english

USER’S MANUAL

1

2

Contents

1. APPLICATION ............................................................................... 5

2. TRANSDUCER SET .....................................................................7

3. BASIC REQUIREMENTS, OPERATIONAL SAFETY .................. 7

4. INSTALLATION ............................................................................. 7

4.1. Way of fixing ........................................................................... 7

4.2. External connection diagrams ................................................9

5. SERVICE ..................................................................................... 11

5.1. Power-on messages of the P18D transducer ...................... 11

5.2. Description of the P18D transducer readout field ................. 12

5.3. Functions of the P18D transducer capacitive button ............ 13

5.4. Programming parameters menu of the P18D transducer ..... 14

5.5. Functions of the P18(D) transducer ...................................... 15

5.5.1. Calculated values ..............................................................16

5.5.2. Selection of controlling values for analog outputs .............16

5.5.3. Individual characteristic of analog outputs ......................... 17

5.5.4. Support of a sensor heater ................................................ 19

5.5.5. Default settings .................................................................. 20

6. RS-485 INTERFACE ................................................................... 21

6.1. Connection of the serial interface ......................................... 21

6.2. Description of the MODBUS protocol implementation .......... 23

6.3 Description of the functions used .......................................... 23

6.4 Map of the registers ............................................................... 26

6.5 Registers for writing and readout ........................................... 27

6.6 Registers for readout ............................................................. 33

6.7 Emergency restoration of default parameters ....................... 36

7. ERROR CODES .......................................................................... 37

8. ACCESSORIES ..........................................................................38

9. TECHNICAL DATA .....................................................................39

10. ORDERING CODE .................................................................... 41

3

4

1. APPLICATION

The PCE-P18 transducers are the devices destined for
the continuous measurement and conversion of relative
humidity and ambient temperature into a digital form and
into a voltage or cur-rent standard signal. The
transducers are fixed on a wall. Programming of the
transmitters is possible via the RS?-485 interface. LPCon
or eCon software designed for configuration of the
transducers is available on the manufacturer’s website:
www.pce-instruments.com. Applied sensor shields
enable the application of the transducers in various
ambient conditions.

Fig. 1. Overview of the P18 and P18D transducers with the probe

on the housing.

5

Fig. 2. Overview of the P18 and P18D transducers with the probe

on the wire 0,5 m.

6

2. TRANSDUCER SET

−

Transducer 1 pc

−

User’s manual 1 pc

−

Warranty card 1 pc

3. BASIC REQUIREMENTS,
OPERATIONAL SAFETY

In terms of operational safety, the transducer meets
the requirements of the EN 61010-1 standard.

Comments concerning safety

Assembly and installation of the electrical connections should

•
conducted only by people authorised to perform assembly of elec­tric devices.

Always check the connections before turning the transducer on.

•

The transducer is designed to installation and usage in the indu-

•
strial electromagnetic environment.

4. INSTALLATION

4.1. Assembly

The P18(D) transducer is designed to be mounted on a wall by
means of a screw connection or glue without the loss of IP65 tightness.
The transducer housing is made of a self-extinguishing plastics. The trans­ducer has screw connectors placed inside the transducer, which enable
the connection of external wires of 1 mm

2

cross-section.

7

Fig. 3. Overall dimensions of the P18(D) transducer

mounting holes

Fig. 4. Lay-out of mounting holes of the P18(D) transducer

8

4.2. External connection diagrams

The P18(D) transducer version P18(D)-1XXX or P18(D)2XXX
has 8 connecting terminals, version P18(D)-0XXX has 4 terminals (ver­sion without analog outputs). Access to the terminals is possible after
removing the cover of the transducer housing. You should use a multi­conductor round wire with external diameter from 3.5 mm up to 6 mm
for electrical connections. Remove the display prior to connecting the
wires in a screw terminal of the P18D transducer. Pass supplying wi­res through the packing and twist the packing seal in order to obtain
the leaktightness. If the packing seal is not twisted, the required IP 65
leaktightness is not ensured. The LCD display should be put back after
screwing the wires to the screw terminal of the P18D transducer.

a) b)

Fig. 5. Marking of the terminals for the connection of external signals

of the P18(D) transducers in versions: a) without analog outputs,

b) with analog outputs.

9

Transducer without

analog outputs

Out

Out

1

Out2Out

1

2

Transducer with current

outputs

Transducer with voltage

outputs

Fig. 6. Wiring diagram of the P18(D) transducer with analog outputs

Use shielded cable for supply and output signals in environ­ments with high levels of interference. The shield must be connected
to the nearest PE point from the feeder side.

10

5. SERVICE

The P18D transducer is equipped with a display field
8x2 characters with illumination and one capacitive button located
on the housing. The P18 transducer is not equipped with a display
or a button. After connecting the wires, closing and servicing
the housing, and connecting to the supply, the transducer is ready
to work with manufacturer’s settings (Tab. 4). The transducer can be
programmed through the RS-485 interface. You can program following
parameters in the transducer:

communication parameters

−

- averaging time of the measurement

−

- individual characteristics of analog outputs (for executions with

−

analog outputs).

The P18D transducers allow programming communication parame­ters (address, baud rate, mode) using the capacitive button.

There is the possibility to connect the transducer through another trans­mission media, like: ETHERNET, USB using LUMEL S.A.’s converters.

5.1. Power-on messages of the P18D transducer

After connecting the external signals and connecting
to the supply, the transducer displays the type, current program version,
serial number and set communication parameters (address, baud rate
and operating mode).

The transmitter automatically switches to the operating mode of me­asurement and processing the analog output signal after approx. 5 se­conds. It displays the measuring value with the unit in the bottom line
of the display, the top line of the display contains information about the
type of displayed quantity and the pictograms of: transmission via RS­485, the presentation mode of the measuring value, the read pointer of
the measuring value of the sensor and the operating state of the internal
heater.

11

5.2. Description of the P18D transducer readout field

The illuminated character LCD is a readout field in the trans­ducer P18D. The illumination is turned on after switching on the supply
and after the capacitive button on the housing is pressed. The illumina­tion is automatically switched off after 30 sec. of inactivity.

Indicator of the measuring value
from the sensor

Type of the displayed value

Value of the displayed
value

Indicator of automatic presenta­tion of the measuring values

Transmission indicator on
RS-485 link

Unit of the displayed
value

Fig. 7. Description of the P18D transducer readout field

Description of the symbols displayed by the P18D transducer is in the Table 1.

Table 1

Symbol Meaning

T:

RH:

Type of the displayed value in the bottom line
of the LCD - temperature

Type of the displayed value in the bottom line
of the LCD - relative humidity

12

DP:
AH:

h

5.3. Functions of the P18D transducer capacitive button

The P18D transducers are equipped with one capacitive
button located on the housing. The location of the button shows in Fig. 8.

Type of the displayed value in the bottom line
of the LCD - dew-point

Type of the displayed value in the bottom line
of the LCD - absolute humidity

The indicator of the measuring value from the sensor

Automatic mode of measurement results presentation

- a type of displayed value is automatically switched

every 3 seconds in the following order: temperature →
relative humidity → dew-point → absolute humidity →

temperature ….
Data receiving indicator by the P18D transducer

on RS-485
Data sending indicator by the P18D transducer

on RS-485
Switching on the internal heater indicator to dry

the sensor

Fig. 8. Location of the P18D transducer capacitive button

13

Capacitive button is used to:

switch the display illumination on

•
change the presentation mode of the measurement results -

•
holding the button for about 2 seconds switches from automatic
mode to manual mode or inversely
change the type of displayed values in the manual mode of presen-

•
tation of the measurement results - pressing the button for a short
time changes the displayed value.
program communication parameters (address, baud rate, mode)

•

5.4. Programming parameters menu of the P18D transducer

Enter the programming menu by pressing and holding
the capacitive button for approx. 5 sec. When entering the menu a first
time, changes direction marker is set to - increasing the value;
next entry in the menu will cause the cyclic switching of the direction
of changes (2 input in the menu will set the marker at v – decreasing
the value). If the idle time exceeds 20 seconds, the transducer will leave
the menu and switch to displaying the measuring value.

Baud

rate

Mode

Address

Direction

of changes

Fig. 9. The displayed information of the transmission parameters in the

P18D transmitter menu

14

Confirmation

of changes

5 seconds

Application
of changes

Measurement

5 seconds

Mode programming

increase/
decrease
the value

decreasing the value
increasing the value

5 seconds

Baud rate programming

increase/
decrease
the value

5 seconds

Address programming

increase/
decrease
the value

Fig. 10. Programming parameters algorithm of the P18D transducer

5.5. Functions of the P18(D) transducer

The P18(D) transducer carries out the functions:

measurement of the ambient temperature and relative humidity

•
calculation of chosen physical quantities (dew-point temperature,

•
absolute humidity, wet bulb temperature)
conversion of measured values into an output signal on the base

•
of the individual linear characteristic (2 configurable analog outputs

- optional)
memory storage of maximal and minimal values for each

•
of the measured and calculated value
programming of the measurement averaging time

•
RS-485 interface servicing in the MODBUS protocol, in RTU

•
mode.
Displaying measuring and calculated values (only P18D)

•

5 seconds

15

5.5.1. Calculated values

Based on the measurement of a temperature and relative
humidity, the P18D transducer calculates dew-point and absolute humi­dity of the following dependencies.

T

n

m



ws

RH

- 1

)

DP → dwe-point:

DP =

log (P

10000  A

 RH

P

DP → absolute humidity:

AH = 2,1668 

ws

100  (T + 273,2)

gdzie:

T → measured temperature [

o

C]

RH → measured absolute humidity [%]
DP → dew-point temperature [
P

→ saturated water vapor pressure (water vapor pressure) [mbar]

ws

AH → absolute humidity [g/m

Table 2

o

C]

3

]

The factors used to calculate the dew-point

o

C] A m T

T [

< 0

0...50

50...100

6.119866 7.926104 250.4138

6.1078 7.5 237.3

5.9987 7.3313 229.1

n

5.5.2. Selection of controlling values for analog outputs

The P18(D) transducers in versions P18(D)-1XX, P18(D)­2XX, P18(D)-4XX, P18(D)-5XX are equipped with two programmable
analog outputs (voltage or current). By default, the first analog output
is set for a presentation of the ambient temperature and the second
analog output is controlled by the value of the relative humidity. The ana­log outputs can respond to any of the measuring or calculated values

16

(T, RH, DP, AH, wet bulb temperature). The value controlling the analog
outputs is defined by the registers, respectively 4015 for the first output
and 4016 for the second analog output (Tab. 14).

5.5.3. Individual characteristic of analog outputs

The P18(D) transducers in the version with analog outputs
enable the conversion of measured values into an output signal ba­sed on the strength of individual linear characteristic of analog outputs.
On the base of given coordinates of two points by the user, the trans­ducer determines (from the system of equations) coefficients a and b
of the individual characteristic.

Y1out = a  X1in + b

{

where:

X1 in and X2 in - displayed value,
Y1 out and Y2 out - oexpected value of the analog output

Y2out = a  X2in + b

Fig. 11. Individual characteristic of analog output

17

The configuration of the individual characteristic of analog
outputs amounts to the introduction of suitable values X1, X2, Y1, Y2
in corresponding registers to them from the range 4007 – 4014 Tab. 3.
The values introduced in these registers must be integral values corre­sponding to the set point values multiplied by the value 100.

Example 1

Configuration of the individual characteristic of the first analog current
output (temperature):

Expected processing temperature in the range -12,25

o

C ÷ 77,75 oC

to the analog current signal in the range 4,5 mA ÷ 18,5 mA.

Table 3

Name Register address Value

X1 temperature 4007 -1225

Y1 current 4008 450

X2 temperature 4009 7775

Y2 current 4010 1850

Caution:

The analog outputs are not isolated from the supply,
the RS-485 interface and each other, the analog current outputs don’t
have a common potential (low potential terminals can not be connec­ted together), analog voltage outputs have a common low potential
(low potential terminals can be connected together).

18

5.5.4. Support of a sensor heater

The sensors used in the P18(D) transducers are equipped
with internal heating elements to allow faster release of water molecu­les from the sensor being flooded or working a long time in highly hu­mid environments. Switching the heater on is possible by writing the
appropriate value to the register 4021 (see Tab. 14). Status of the heater
is available in the status register (register 4017) at the bit position 11
(if the bit 11 of the register 4017 is set to „1” - this means that the heater
is switched on).

Caution:

The transducer with a heating element switched on does not measure
the proper ambient temperature and humidity! (the temperature mea­sured by the sensor increases and the humidity decreases). The value
200 is added to the measuring values (temperature, relative humidity)
when using the transducer with the heater switched on in order to avoid
distortions of a measurement in the measurement systems!
The P18D transducers working with a heating element swit­ched on display a flashing symbol h.

Fig. 12. Indication of the P18D transducer operation

with a heater switched on

19

5.5.5. Default settings

The Table 4 shows the standard settings of the P18D transdu­cer. The settings can be restored via the RS-485 interface after writing
the value „1” to the registry 4020.

Table 4

Parameter

description

Address 4001 1
Baud rate 4002 9600
Mode 4003 RTU 8N2
Averaging time 4005 30 [s]
X1 of the 1st

analog output
Y1 of the 1st

analog output
X2 of the 1st

analog output
Y2 of the 1st

analog output
X1 of the 2nd

analog output
Y1 of the 2nd

analog output
X2 of the 2nd

analog output
Y2 of the 2nd

analog output

Para­meter

address

4007 0 -2000 -2000

4008 0 400 0

4009 0 6000 6000

4010 0 2000 1000

4011 0 0 0

4012 0 400 0

4013 0 10000 10000

4014 0 2000 1000

P18D-0XX,

P18D-3XX

Standard value

P18D-1XX,

P18D-4XX

P18D-2XX,

P18D-5XX

20

Value control­ling the first
analog output.

Value control­ling the second
analog output.

Custom confi­guration

4015 0 0 0

4016 1 1 1

4019 8 8 8

6. RS-485 INTERFACE

The P18(D) programmable digital transducers have a serial link
RS-485 for communication in the computer systems and with other de­vices that serve as a Master. Asynchronous character MODBUS com­munication protocol has been implemented in a serial link. The transmis­sion protocol describes how to exchange information between devices
via a serial link.

Caution:

For the transmitter versions without analog outputs (P18 (D) -0XX
and P18 (D) -3XX), the RS-485 interface is galvanically isolated from
the supply - 1 kV separation.

For the transmitter versions with analog outputs, the RS-485 interfa­ce is not isolated from the supply or from the analog outputs.

6.1. Connection of the serial interface

Standard RS-485 allows a direct connection up to 32 devices
on a single serial link to a length of 1200 m (at baud rate 9600 b/s).
It is necessary to use additional intermediate-separation circuits for con­necting higher number of the devices, for example PD51 manufactured
by LUMEL S.A.

21

Output of the interface line is shown in Fig. 6. It is required to con­nect the lines A and B in parallel with their equivalents in other devices
to obtain the correct transmission. The connection must use a shielded
wire. The cable shield should be connected to the protective terminal
in close proximity to the transmitter (connect a shield to the protective
terminal at one point only).

RS-485 interface card or the converter is required for a connection
to a PC, for example PD10. The method of connecting devices is shown
in Fig. 13.

22

Fig. 13. Connecting the RS-485 interface.

6.2. Description of the MODBUS protocol implementation

The implemented protocol is compliant with the PI-MBUS-300
Rev G specification of Modicon.

Set of parameters of the P18D transducer serial link in the MODBUS
protocol:

•

Transducer address 1..247.

•

Baud rate: 4800, 9600, 19200, 38400, 57600, 115200 [b/s].

•

Operating mode: RTU frame format: 8N2, 8E1, 8O1, 8N1.

•

Maximum response time: 500 ms

Configuration of the serial link parameters consists of determining
the baud rate, the device address and the format of the transmission
mode - protocol.

Caution: Each transmitter connected to the communication network must:

•

have a unique address, different from the addresses of other devi­ces connected to the network.

•

Identical baud rate and type of a transmission mode

6.3 Description of the functions used

Following functions of the MODBUS protocol have been implemented
in P18D transducers:

•

03 (03h) – readout of registers group,

•

04 (04h) – readout of input registers group,

•

06 (06h) – single register writing,

•

16 (10h) – registers group writing,

•

17 (11h) – slave device identification.

23

Readout of n-registers (code 03h)
Example 1. Readout of 2 registers, starting with the register address

1D4Dh (7501) float (32-bit), (register values 25.68, 20.25.)

Request:

Device

address

Function

01h 03h 1Dh 4Dh 00h 02h 5270h

Register address Number of registers

B1 B0 B1 B0

Table 5

CRC check-

sum

Response:

Device

Fun-

ad-

ction

dress

01h 03h 08h 41h CDh 70h A4h 41h A2h 00h 00h 83D0h

Value from the register

Num­ber of
bytes

1DB 0 (7501)

B3 B2 B1 B0 B3 B2 B1 B0

Value from the register

1DB1 (7502)

Table 6

Single register writing (code 06h)

Example 2. Writing the value 78h (120) to the register FA1h (4001)

Request:

Device

address

01h 06h 0Fh A1h 00h 78h DB1Eh

Function

Register address Register value

B1 B0 B1 B0

Table 7

CRC

checksum

Response:

Device

address

01h 06h 0Fh A1h 00h 78h DB1Eh

Function

Register address Register value

B1 B0 B1 B0

Table 8

CRC

checksum

24

CRC

check-

sum

Writing n-registers (code 10h)

Example 3. Writing the value 78h (120) and the value 4h (4) to the regi-

sters FA1h, FA2h (4001, 4002)

Register

value
4002

Table 9

Table 10

checksum

Request:

De-

vice

Fun­ction

Register
address

Function

ad-

dress

01h 10h 0Fh A1h 00h 78h 04h 00h 78h 00 04 F831h

Response:

Device

address

01h 10h 0Fh A1h 00h 02h 133Eh

Number of

registers

Register address Number of registers

B1 B0 B1 B0

Register

Num­ber of
bytes

B1 B0 B1 B0

value
4001

Device identification report (code 11h)

Example 4. Device identification

Request:

Device

address

Response:

Device

ad-

dress

01h 11h 0Eh CCh FFh

Function Checksum

01h 11h C02Ch

Fun­ction

Num­ber of

bytes

Table 11

Identi-

fier

P18D

De-

The field depending on the

vice

status

device software version

50h 31h 38h 44h 76h 2Eh
30h 2Eh 30h 34h 20h 00h

(e.g. 0.70)

Table 12

check-

B154h

CRC

check-

CRC

CRC

sum

sum

25

6.4 Map of the registers

In the P18D transducer, data are placed in 16 and 32-bit

registers. Process variables and transducer parameters are placed
in the address area of registers in a way depended on the variable
value type. Bits in 16-bit registers are numbered from the youngest
to the oldest (b0 … b15). The 32-bit registers (4 bytes) contain numbers
of float type in IEEE-754 standard. Bytes sequence: B3 B2 B1 B0 –
the oldest byte is transmitted as the first.
A following map is the map of P18(D) transducers registers.

Caution:

All listed addresses are physical addresses. Some computer programs
use logic addressing, then the addresses should be increased by 1.

Table 13

Address

range

4000-4022 integer

6000-6030 float (32 bits)

7000-7030 float (32 bits)

7500-7515 float (32 bits)

Value type Description

The value is located in the 16-bit register.

(16 bits)

Value set in the two following 16-bit
registers. These registers contain the same
data as 32-bit registers from 7500-7515
range. Readout registers. Bytes sequence
(B1,B0,B3,B2)

Value set in the two following 16-bit
registers. These registers contain the same
data as 32-bit registers from 7500-7515
range. Readout registers. Bytes sequence
(B3,B2,B1,B0)

The value is located in the 32-bit register.
Registers contain measured and calculated
data by the transducer. Registers are only
for readout.

26

6.5 Registers for writing and readout

Table 14

Name

The value is located

in the 16-bit registers

4000 Identifier

4001 Address

4002 RS-485

baud rate

4003 RS-485

transmis­sion mode

Range Description

Write (w) / readout (r)

w/

180 P18 device identifier

r

204 P18D device identifier

w/

1...247 Device address

r

0...5 Va­lue

0 4800 bit/s
1 9600 bit/s
2 19200 bit/s
3 38400 bit/s
4 57600 bit/s
5 115200 bit/s

0...3 Va­lue

0 RTU 8N1
1 RTU 8N2
2 RTU 8E1
3 RTU 8O1

Description

Description

27

4004 Confir-

mation
of trans­mission
parameters
changes

4005 Averaging

time

4006 Erasing

the extre­mes

4007 X1 of out-

put 1

4008 Y1 of out-

put 1

4009 X2 of out-

put 1

4010 Y2 of out-

put 1

4011 X1 of out-

put 2

4012 Y1 of out-

put 2

4013 X2 of out-

put 2

4014 Y2 of out-

put 2

4015 Value

controlling
1 analog
output.

0...1 Va-

Description

lue

0 No change
1 Confirmation of changes

w/

6...3600 Averaging time of the mea-

r

w/

r

0...1 Va-

surement [s]

Description

lue

0 No change
1 Erasing the min. and

max. values

w/

r

w/

r

w/

r

w/

r

w/

r

w/

r

w/

r

w/

r

w/

r

-32768

...32767

-32768

...32767

-32768

...32767

-32768

...32767

-32768

...32767

-32768

...32767

-32768

...32767

-32768

...32767

0...3 Va-

Value controlling out-

put 1 - point X1[ x100]

Expected value of
output 1 for point X1

Value controlling output

1 - point X2 [ x100]

Expected value of
output 1 for point X2

Value controlling output

2 - point X1 [ x100]

Expected value of
output 2 for point X1

Value controlling output

2 - point X2 [ x100]

Individual characteristic of analog outputs

Expected value of out­put 2 for point X2

Description

lue

0 Temperature
1 Relative humidity

28

4016 Value

controlling
2 analog
output.

4017 Status

w/

r

w/

r

0...3 Va-

-32768

...32767

2 Dew-point
3 Absolute humidity
4 Wet bulb tempera-

ture
Description

lue

0 Temperature
1 Relative humidity
2 Dew-point
3 Absolute humidity
4 Wet bulb tempera-

ture

Transducer status. Shows
the current state of the trans­ducer and the hardware con­figuration. Successive bits
represent the event. Bit set
to 1 indicates that the event
took place.

Bit15 Restart of the supp-

ly, writing the value

-32768 (8000h) will
clear the status bit

Bit14 Error of the calibra-

tion parameters

Bit13 Error of the transmit-

ter settings - enter the
new settings

29

Bit12 not used
Bit11 Indicator of switching

the heater on

Bit10 Indicator of erasing

the extremes, writing
the value 1024 (400h)
erases the status bit

Bit9 Temporary commu-

nication parameters
are set (shorten jum-

per „ZW”)
Bit8 LCD display error
Bit7 Error reading the va-

lue from the sensor

Bit5,6Value controlling 2

analog output

00 01 10 11

30

temperature

dew-point

relative humidity

absolute humidity

Bit3,4Value controlling 1

analog output

00 01 10 11

temperature

dew-point

relative humidity

absolute humidity

4018 Software

version

4019 Custom

configura­tion

Bit2 results averaging in-

terval has ended

Bit1 The transducer is equi-

pped with the analog
outputs - voltage.

Bit0 The transducer is equi-

pped with the analog
outputs - current.

o

1...999 Software version x100

w/

0...31 Bit0 Value Descrip-

r

Bit1

Number of characters

...4

of a response delay
to the query for the
RS-485 transmission

tion

0 The stan-

dard map
of the re­gisters in
the range
7000 and
7500

1 Map of

the regi­sters in
the ran­ge 7500
and 7000
compliant
with the
map of
the P14W
transdu­cers

31

4020 Default

settings

4021 Controlling

the heater

4022 reserved

w/

r

0...1 Va­lue

0 no change
1 przywraca parametry

Va­lue

0 switching a heater off
1 permanent switching

3 displaying remaining

60

...

32768

Description

fabryczne
Description

a heater on

time of a heater swit­ched on

switching a heater on
for Xn seconds (Xn ­value from the range

60...32768 )

32

6.6 Registers for readout

Table 15

Name

32-bit registers

from the area 7500.

Unit

Quantity name

Write (w)/ readout (r)

The value is located in the

Value set in the two following 16-bit registers.

Registers contain the same data as 32-bit registers

7000 7500 ID r - P18(D) device identifier

o

7002 7501 T r

Measured temperature

C

7004 7502 RH r % Measured relative humidity

o

7006 7503 DP r
7008 7504 AH r

C Calculated dew-point

3

Calculated absolute humi-

g/m

dity

o

7010 7505 min T r

7012 7506 max T r

Min. of temperature

C

o

Max. of temperature

C
7014 7507 min RH r % Min. of relative humidity
7016 7508 max RH r % Max. of relative humidity

o

7018 7509 min DP r

Min. of dew-point

C

33

7020 7510 max DP r

7022 7511 min AH r

7024 7512 max AH r

7026 7513 r

o

Max. of dew-point

C

3

Min. of absolute humidity

g/m

3

Max. of absolute humidity

g/m

o

Wet bulb temperature

C

7028 7514 r kPa Water vapor pressure

Table 16 shows the registers of measuring values of the P18D transdu­cer working in the registers 7000 and 7500 compatibility mode with the
P14W transducer

Table 16

from the area 7500.

gisters contain the same data as 32-bit registers

Value set in the two following 16-bit registers. Re-

Name

32-bit registers

The value is located in the

Unit

Quantity name

Write (w) /readout (r)

7000 7500 ID o - P18(D) device iden-

tifier

34

7002 7501 T o

7004 7502 DP o
7006 7503 - - -

7008 7504 RH o %

7010 7505 AH o

g/m

7012 7506 - - ­7014 7507 - - ­7016 7508 - - ­7018 7509 min T

7020 7510 max T

7022 7511 min DP

7024 7512 max DP

7026 7513 - -

7028 7514 - -

7030 7515 min RH

o %

7032 7516 max RH o

7034 7517 min AH

7036 7518 max AH o

o

g/m

g/m

o

Measured tempera-

C

ture

o

Calculated dew-point

C

Measured relative
humidity

3

Calculated absolute
humidity

o

Min. of temperature

C

o

Max. of temperature

C

o

Min. of dew-point

C

o

Max. of dew-point

C

-

-

Min. of relative
humidity

Max. of relative

%

humidity
Min. of absolute

3

humidity
Max. of absolute

3

humidity

35

6.7 Emergency restoration of default parameters

If the communication parameters have been changed and the
new configuration is lost, you can use the jumper marked „ZW” on the
transmitter’s board to set the temporary communication parameters:

address 247

•
baud rate 9600 kb/s

•
mode RTU 8N2

•

You can connect to the transmitter after setting the temporary parame­ters and adjust them or restore the defaults settings. After removing
the jumper, the transducer returns to previous settings or to settings
changed during the operation with the jumper.

jumper ZW

Fig. 13. Placement of the jumper setting temporary communication

parameters

36

7. ERROR CODES

The error messages could be displayed on the transducer
P18D display during operation. The table below lists the error codes
which are possible to be displayed and their reasons as well as the
recommended user responses. Information about the existing errors is
also available in the P18(D) transducers status register - register 4017.

Table 17

Message

Error

Sensor

Error

Calibr.

Error

Param.XX

bit no.

reg. Status

(reg. 4017)

Description

7 Sensor failure - transmitter should be

returned to a service

14 Loss of calibration parameters - loss

of efficiency of the analog outputs,
measurements are correct - returning
a transmitter to a service should be
considered

13

Loss of transmitter settings - XX

- number of a parameter (register
number 40XX) configured incorrectly

- correct value should be written to
the register 40XX or default settings
restored

37

8. ACCESSORIES

As a standard, the P18(D) transducer is equipped with a shield
of the sensor, destined only for indoors applications. It is recommended
to use additional shields of the sensor (interchangeable) for outdoors or
indoors applications exposed to the possibility of water vapor condensa­tion, depending of the transducer working conditions.

Table 18

Item

Order code

1 0874-490-016

2 0874-490-015

3 0874-490-014

38

Dra­wing

Name

Design Features

PCV ho­using, PTFE
membrane
with a lami­nated film,
pore size:

Membrane filter

1 µm

Sintered
PTFE, pore
size 50 µm

PTFE filter

Sintered
bronze,
pore size
60 µm

Sintered bronze filter

Average effe­ct of filtration,
maximal tem­perature: up to
80oC, respon­se time t10/90:
15 s

High chemical
resistance, ma­ximal temperatu­re: up to 180 oC,
response time
t10/90:14 s

High mechani­cal resistance,
used in high
pollution and
low humidity,
response time
t10/90: 10 s

Typical appli-

cations

Building auto­mation, for use
in the rooms
with small pol­lution

Drying process
in chemical ap­plications

Agriculture

6. TECHNICA L D ATA

Basic parameters:

- range of relative humidity
measurement (RH) 0...100%, without condensation

- basic error of humidity
conversioni ± 2% of the range for RH = 10...90%
± 3% for the remaining range

- hysteresis of the humidity
measurement ± 1% RH

- basic range of temperature
measurement (T) -20...60°C

2)

- basic error of temperature

conversion ± 0.7°C

1)

- calculated values absolute humidity (a) [g/m3]

dew-point temperature (Td) [

o

C]

- additional errors:

± 25% of the basic error /10°C

RS-485 digital output:

- transmission protocol MODBUS

- baud rate 4800, 9600,19200,38400,

57600 bit/s

- mode RTU: 8N2, 8E1, 8O1, 8N1

- max. response time 300 ms

Analog outputs:

- current 4...20 mA

- voltage 0...10 V

- max. load resistance

of the current output 100 Ω

- min. load resistance

of the voltage output 1 kΩ

39

Rated operating conditions:

- supply 9...24 V a.c./d.c.

- power consumption < 0.5 VA

- ambient temperature - 20...23...60

- relative air humidity < 95%

- rate of air flow  0,5 m/s

o

C

3)

4)

- preheating time 15 minutes

- protection grade ensured
by the housing IP 65

- fixing on a wall

- weight 125 g

- dimensions (35

´ 58 ´ 118) mm

- working position:

in applications non-exposed to a direct contact with water: any

•
in applications exposed to a direct contact with water:

•
with the sensor chamber directed towards the ground

Electromagnetic compatibility:

- noise immunity acc. to EN 61000-6-2

- noise emission acc. to EN 61000-6-4

Safety requirements acc. to EN 61010-1

- installation category III

- pollution grade 2

- phase-to-earth operating voltage 50 V

- altitude above sea level < 2000 m

1)

In case of condensation of water vapor on the sensor surface,
the measurement error may exceed the basic error till a moment
of drying up the sensor structure

2)

The absolute temperature measurement range is –30...85oC but the
measurement class is not guaranteed beyond the basic range

3)

Admissible condensation of water vapor when using additional sensor
shields, see Tab. 9)

4)

For air flow < 0.5 ms, the temperature and humidity measurement

error may increase by 100%.

40

7. ORDERING CODE

Table 10

P18(D) -

Analog outputs - sensor:

without outputs, sensor on the housing 0
current 4...20 mA, sensor on the housing 1
voltage 0...10V, sensor on the housing 2
without outputs, probe on the wire 0,5 m 3
current 4...20 mA, probe on the wire 0,5 m 4
voltage 0...10V, probe on the wire 0,5 m 5

Version:

standard 00
custom-made* XX

Language:

Polish P
English E
other* X

Acceptance tests:

Without extra quality requirements 0
With quality inspection certificate 1

Acc. to customer’s request* X

*

after agreeing with the manufacturer

Code example:

P18D-100E1 means the P18D transducer, standard version with the
sensor on the housing with analog current output, English language,
with quality inspection certificate.

X XX X X

41

42

43

P18-09C

PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[e-mail]
www.pce-instruments.com/us

www.industrial-needs.com

PCE Instruments UK Ltd.

Units 12/13

Southpoint Business Park

Ensign way

Hampshire / Southampton

United Kingdom, SO31 4RF

From outside UK: +44

Tel: [phone]

Fax: [phone]

[e-mail]

www.pce-instruments.com/english