PCE Instruments PCE-N24 Series User manual

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DIGITAL PANEL METER
N24 AND
N25 SERIES
USER’S MANUAL
PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[email protected]
www.pce-instruments.com/english
www.pce-instruments.com
PCE Instruments UK Ltd.
Unit 11
Southpoint Business Park
Ensign way
Hampshire / Southampton
United Kingdom, SO31 4RF
From outside UK: +44
Tel: [phone]
Fax: [phone]
[email protected]

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Contents
1. APPLICATION .............................................................................5
2. METER SET .................................................................................5
3. OPERATIONAL SAFETY ............................................................6
4. INSTALLATION............................................................................7
4.1 Fixing Way ............................................................................7
4.2 External Connection Diagrams ..............................................8
5. SERVICE ...................................................................................10
5.1 Display Description .............................................................10
5.2 Messages after Switching the Supply on ............................10
5.3 Meter Configuration by Means of LPCon/eCon Program ..11
5.4 Manufacturer’s Parameters of N24S, N25S .. 12
5.5 Manufacturer’s parameters of N24T, N25T ... 12
5.6 Manufacturer’s Parameters of N24Z, N25Z .......13
5.7 Manufacturer’s Parameters of N24H, N25H ......14
6. ERROR CODES ........................................................................15
7. TECHNICAL DATA ...................................................................15
7.1 Technical Data of ..........................15
7.2 Technical Data of .................. 16
7.3 Technical Data of ..........................17
7.4 Technical Data of ..........................17
7.5 Common Technical Data
for the Whole N24 and N25 Series ...................18
8. ORDER CODES ........................................................................20
9. SERVICE AND MAINTENANCE ...............................................23

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1. APPLICATION
Meters of the N24 and N25 series are digital instruments destined
for the measurement of d.c. voltage or d.c. current: uni or bipolar,
temperature through J, K thermocouples, Pt100 resistance thermometers
and for the measurement of a.c. voltage and a.c. current. A LED display
(4 digits for N24 and 5digits for N25 meter series) constitutes the
readout field. The program is destined for the configuration
of N24 and N25 meter series. One must connect the meter with
the PC computer through the PD14 programmer.
ollowing parameters can be reprogrammed:
- thresholds of displayed overflows,
- precision of the displayed result (decimal point),
- measurement averaging time ,
- counting of indications (individual characteristic),
- automatic or manual compensation: cold junction temperature for
measurements with thermocouples, or wire resistance for Pt100
measurements (only in N24T and N24S meters).
All meters are galvanically separated between the supply, measuring
inputs and the programmer input
Protection grade from the frontal side: IP65.
Meter overall dimensions: 96 x 48 x 64 mm (with terminals).
2. METER SET
The set is composed of:
– Meter types: N24 or N25 ............................................1 pc
– User’s manual............................................................................1 pc
– Clamps to fix in the panel..........................................................4 pcs
When unpacking the meter, please check whether the type and exe-
cution code on the data plate correspond to the order. If equipment is

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incomplete or appears to be damaged, file immediately a claim with the
carrier and notify the sender at once.
3. BASIC REQUIREMENTS, OPERATIONAL
SAFETY
In the safety service scope, the meter meets the requirements of the EN
61010-1 standard.
Meaning of the symbol:
Caution: risk of hazard.
Observations concerning the operational safety
· All operations concerning transport, installation, and commissioning
as well as maintenance, must be carried out by qualified, skilled
personnel, and national regulations for the prevention of accidents
must be observed.
· The programming of N24 and N25 meter series
parameters must be carried out after disconnecting measuring circuits
· Before switching the meter on, one must check the correctness of
connections to the network.
·Do not connect the meter tothe network through an autotransformer.
· Before removing the meter housing, one must switch the supply off
and disconnect measuring circuits.
· The removal of the meter housing during the guarantee contract
period may cause its cancellation.
·The meter fulfills requirements related to electromagnetic compa-
tibility and can be us ed in the industrial electromagnetic environment
· When connecting the supply, one must remember that a switch or a
circuit-breaker should be installed in the building. This switch should be
located near the device, easy accessible by the operator, and
suitably marked as an element switching the meter off.
· Non-authorized removal of the housing, inappropriate use, incorrect
installation or operation, creates the risk of injury
to personnel or meter damage.
For more detailed information, please study the U ser’s Manual.

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Fig. 2. Overall dimensions
Fig. 1. Meter fixing
4. INSTALLATION
4.1. Fixing Way
The meter has separable strips with screw terminals which enable the
connection of external wires of 2.5 mm 2cross-section. In execution for
current measurement, the plug enables a permanent fixing to the so-
cket by means of screws. The meter is adapted to be mounted in a
panel by means of clamps, acc. to the fig. 1.
One must prepare a hole of 92+0,6 45+0,6 mm in the panel which the
thickness should not exceed 6 mm.
The meter must be introduced from the panel front with disconnected
supply voltage. Before the insertion into the panel, one must check the
correct placement of the seal. After the insertion into the hole, fix the
meter by means of clamps (fig.1).

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4.2. External Connection Diagrams
4.2.1 Electrical Connections of the N24S and
N25S Meters
Fig. 3. Electrical connection of the N24S, N25S meters
4.2.2 Electrical Connection of the PCE-N24T and PCE-
N25T Meter
Fig. 4. Electrical connection of the N24T, N25T meters
PCE-PD14
PCE-PD14

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Fig. 5. Connections of the N24T and N25 T measuring
inputs
Resistance thermometer in a
two-wire system and with
manual compensation
Resistance thermometer in a
three-wire system and with
automatic compensation
Thermocouple J, K
4.2.3 Electrical Connections N24Z, N24H and
N25Z, N25H Meters
Fig. 7. Electrical connections of N24Z, N25Z and
N24H, N25H meters for the current measurement.
Fig. 6. Electrical connections of N24Z, N24H and
N25Z, N25H meters for the measurement of voltage (and
frequency measurement only for the N24Z and N25Z
meters)
PCE-PD14
PCE-PD14

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5. SERVICE
5.1. Display Description
Fig. 8. Frontal panel
5.2. Messages after Switching the Supply on
After switching the supply on, the meter displays the meter name ap-
propriate to the kind of measured signal: N24e, N25E where Eis
the appropriate execution of the s,t,2,h . meter and next, the
program version in the shape rx.xx – where x.xx is the number of
the current program version or the number of a custom-made
execution. Till the time to obtain the required number of correct
measurements (acc. to the table 1 – for N24S, N24T,
N24H, N25S, N25T, N25H meters or acc. to the table
2 – for N24Z and N25Z meters) the arithmetical mean value
from until now measurements is displayed. The measurement of a value
Measured
value

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from behind the measuring range causes the setting of the overflow
and the beginning of the counting of correct measurements again.
The time is set by the manufacturer on 1 sec.
Table 1
Averaging time 0 5 s 1 s 3 s 5 s 10 s 15 s 20 s
Number of averaged
measurements 2 7 20 33 67 100 133
Updating of the value
on the display 05 s 0 5 s 0 5 s 0 5 s 0 5 s 0 5 s 0 5 s
Table 2
Averaging time 0 5s 1s 3s 5s 10s 15s 30s 1 m 2 m 5 m 7 m 12 m 15 m
Number of averaged
measurements 126 10 20 30 60 100 100 100 100 100 100
Updating of the va-
lue on the display 05s 0 5s 0 5s 0 5s 0 5s 0 5s 0 5s 0 5s 0 5s 0 5s 0 5s 0 5s 9 1s
In case of any error occurrence or exceeding of the range value, one of
the message described in the section 6 will be displayed.
5.3. Meter Configuration by Means of the
LPCon Program
The free delivered LPCon program, available on the
page, is destined
for the PCE-N24 and PCE-N25 meter series configuration. The configuration
user’s manual for PCE-N24 and 25 meters by means of the LPCon
program is also available on the
page.
The PCE-PD14 programmer is required for the configuration.
CAUTION!
The programming of meter parameters must be carried out
when measuring circuits are switched off!

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5.4. Manufacturer’s Parameters of N24S
and N25S Meters Table 3
Table 4
Parameter description Range/value (
N24/ N25)
Manufacturer’s
value N24T
Manufacturer’s
value N25T
Decimal point
0000, 000.0, 00.00,
0.000/00000, 0000.0,
000.00, 00.000,
0.0000
0000 for J
and K
thermocouples,
000.0 for Pt100
00000 for J
and K
thermocouples,
0000.0 for Pt100
Averaging time 0.5 s; 1 s; 3 s; 5 s;
10 s; 15 s; 20 s; 1 s 1 s
Individual
characteristic disabled, enabled disabled disabled
Parameter aof the in-
dividual characteristic
-1999...9999/
-19999...99999 1 1
Parameter description Range/value (
N24/ N25)
Manufacturer’s
value N24S
Manufacturer’s
value N25S
Decimal point
0000, 000.0, 00.00,
0.000/00000, 0000.0,
000.00, 00.000,
0.0000
00.00 for U,I
unipolar;
000.0 for U
bipolar;
000.00 for U,I
unipolar;
0000.0 for U
bipolar;
Averaging time 0.5 s; 1 s; 3 s; 5 s;
10 s; 15 s; 20 s; 1 s 1 s
Individual
characteristic disabled, enabled disabled disabled
Parameter aof the in-
dividual characteristic
-1999...9999/
-19999...99999 1 1
Parameter bof the in-
dividual characteristic
-1999...9999/
-19999...99999 0 0
Upper overflow of the
measurement
-1999...9999/
-19999...99999 9999 99999
Lower overflow of the
measurement
-1999...9999/
-19999...99999 -1999 -19999
5.5. Manufacturer’s Parameters of N24T
and N25T Meters

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Parameter bof the in-
dividual characteristic
-1999...9999/
-19999...99999 0 0
Automatic compensa-
tion of terminal tempe-
rature/wire resistance
disabled, enabled disabled disabled
Value of manual com-
pensation: terminal
temperature/wire
resistance
-20...60°C/0...20 40°C/0 40°C/0
Upper overflow of the
measurement
-1999...9999/
-19999...99999 9999 99999
Lower overflow of the
measurement
-1999...9999/
-19999...99999 -1999 -19999
Table 5
5.6. Manufacturer’s Parameters of N24Z
and N25Z Meters
Parameter description Range/value (
N24/ N25)
Manufacturer’s
value N24Z
Manufacturer’s
value N25Z
Decimal point
0000, 000.0, 00.00,
0.000/00000, 0000.0,
000.00, 00.000,
0.0000
000.0 for U,f
0.000 for I
0000.0 for U,f
0000.0 for I
Averaging time
0.5 s; 1 s; 3 s; 5 s;
10 s; 15 s; 30 s;
1 min; 2 min; 5 min;
7 min; 12 min; 15 min
1 s 1 s
Individual
characteristic disabled, enabled disabled disabled
Parameter aof the in-
dividual characteristic
-1999...9999/
-19999...99999 1 1
Parameter bof the in-
dividual characteristic
-1999...9999/
-19999...99999 0 0
Upper overflow of the
measurement
-1999...9999/
-19999...99999 9999 99999
Lower overflow of the
measurement
-1999...9999/
-19999...99999 -1999 -19999

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Table 6
Parameter description Range/value (
N24/ N25)
Manufacturer’s
value N24H
Manufacturer’s
value N25H
Decimal point
0000, 000.0, 00.00,
0.000/00000, 0000.0,
000.00, 00.000,
0.0000
0000 for U
or 00.00 for I
bipolar
000.0 for U
unipolar
0000.0 for U
or 000.00 for I
Averaging time 0.5 s; 1 s; 3 s; 5 s;
10 s; 15 s; 20 s; 1 s 1 s
Individual
characteristic disabled, enabled disabled disabled
Parameter aof the in-
dividual characteristic
-1999...9999/
-19999...99999 1 1
Parameter bof the in-
dividual characteristic
-1999...9999/
-19999...99999 0 0
Upper overflow of the
measurement
-1999...9999/
-19999...99999 9999 99999
Lower overflow of the
measurement
-1999...9999/
-19999...99999 -1999 -19999
5.7. Manufacturer’s Parameters of N24H
and N25H Meters

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7. TECHNICAL DATA
7.1. Technical Data of N24S and
N25S Meters
Measuring range:
INPUTS:
Measuring range of voltage Un:
-11 mV...-10 mV...60 mV...66 mV
-66 mV...-60 mV...60 mV...66 mV
-0.5 V...0 V...10 V...11 V input resistance > 1 M
-11 V...-10 V...10 V...11 V
Measuring range of current In:
-1 mA...0 mA...20 mA...22 mA input resistance 10 1%
3.6 mA...4 mA...20 mA...22 mA input resistance 10 1%
Basic error
(at manufacturer’s settings): (0.2% of the range + 1 digit)
6. ERROR CODES
After switching the meter to the network on, messages about errors
can appear. Messages about errors and their reasons are presented
below.
,
Overflow of the upper value of programmed
indication range. In the option with Pt100, this
message also signals incorrect connections of
the wire to the terminal 4.
,
Overflow of the lower value of programmed
indication range.
ErCA Loss of meter calibration values. In such a case,
one must contact the service workshop.
ErEE Incorrect values in the meter configuration data.
One must set up again meter parameters by
means of the LPCon program.

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Output for supply external
transducers 24 V 5% 30 mA
Sustained overload 110% Un, 110% In
Short duration overload (1 s): voltage input 10 Un
current input 5 In
7.2. Technical Data of N24T and N25T
Meters
Measuring range:
INPUTS:
Pt100:
-50°C...150°C
-50°C...400°Ccurrent flowing through the sensor < 300 A
Resistance of wires connecting
the resistance: 5 by wire for the automatic
compensation
10 by wire for the manual
compensation
Temperature measurement
by thermocouple of J type: -50 °C...1200°C
Temperature measurement
by thermocouple of K type: -50 °C...1370°C
Basic error
(at manufacturer’s settings): (0.2% of the range + 1 digit)
Additional errors in rated
operating conditions:
- compensation of cold junction
temperature changes 0.2% of the range
- compensation of wire
resistance changes 0.2% of the range
Output for the supply
of external transducers 24 V 5% 30 mA
Short duration overload (1 s): inputs of sensors: 30 V

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7.3. Technical Data of N24Z and N25Z meters
Measuring range:
INPUTS:
Measuring range of voltage Un:
1...100...120 V a.c.
2.5...250...300 V a.c. input resistance > 2 M
4...400...600 V a.c.
Measuring range of current In:
0.01...1...1,2 A a.c. input resistance 10 m 10%
0.05...5...6 A a.c. input resistance 2 m 10%
Measurement of frequency 20...500 Hz
(in voltage range 24...480 V) input resistance > 2 M
Basic error (at manufacturer’s settings) :
- voltage and current: (0.5% of the range + 1 digit)
in frequency interval 20...500 Hz
- frequency: (0.02% of the range + 1 digit)
Sustained overload 150% Un (only for 400 V input),
120% Un (for other Un),
120% In
Short duration overload (1 s) voltage input 2 Un (< 1000 V),
current input 10 In
7.4. Technical Data of N24H and N25H
Meters
Measuring range:
INPUTS:
Measuring range of unipolar voltage Un:
0...100...110 V d.c.
0...250...275 V d.c. input resistance > 2 M

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Measuring range of bipolar voltage Un:
-120...-100...100...120 V d.c.
-300...- 250...250...300 V d.c. input resistance > 2 M
-600...- 400...400...600 V d.c.
Measuring range of bipolar current In:
-1.2...-1...1...1.2 A d.c. input resistance 10 m 10%
-6...- 5...5...6 A d.c. input resistance 2 m 10%
Basic error
(at manufacturer’s settings):
- voltage and current: (0.2% of the range + 1 digit)
Sustained overload: 150% Un (only for 400 V input),
120% Un (for other Un),
120% In
Short duration overload (1s)voltage input 2 Un (<1000 V)
current input 10 In
7.5. Common Technical Data for the Whole
N24 and N25 Series
Rated operating conditions:
- supply voltage 230 V 10% a.c. (45...65 Hz)
110 V 10% a.c. (45...65 Hz)
24 V 10% a.c. (45...65 Hz)
85...253 V a.c. (45...65 Hz) or d.c.
20...40 V a.c. (45...65 Hz) or d.c.
- ambient temperature -10...23...55°C
- storage temperature -25...+85°C
- humidity < 95% (condensation inadmissible)
- work position any

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Additional errors in rated operating conditions:
5-digit LED display (PCE-N25 series)
20 mm (PCE-N24)/14 mm (PCE-N25 series)
-from ambient temperature changes (50% of basic error/10 K)
Averaging time (programmable) 0.5 s (by default 1 s)
Preheating time 30 minutes
Readout field: 4-digit LED display (PCE-N24 series)
- digit height
- colour red
- indication range: -1999...9999 (PCE-N24 series)
-19999...99999 (PCE-N25 series)
Ensured protection grade
from the frontal side: IP 65 acc. to EN 60529
Overall dimensions: 96 x 48 x 64 mm (with terminals)
Weight: < 0.25 kg
Input power < 6 VA
Galvanicisolation between:
- supply-measuring input 3.2 kV d.c.
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:
isolation between circuits: basic,
installation category III (for the 400 V option – category II),
pollution grade: 2,
maximal phase-to-earth working voltage:
- for the supply circuit: 300 V,
- for the measuring input 600 V – category II (300 V – cat. III)
- for the programming input: 50 V
altitude above sea level: < 2000 m,

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DIGITAL PANEL METER N2X X- X X XX XX X X
Number of display digits:
four ( N24 series) ............................................ 4
five ( N25 series) ............................................. 5
Kind of input signal:
standard: voltage, current ................................... ........ S
temperature: thermocouples, resist. thermometers ..... T
a.c. signals .......................................................... ........ Z
d.c. signals: high voltage, high current ....................... H
Input:
see table 8 .................................................................. ..... X
Supply:
230 V a.c. ..................................................................... ..... ..... 1
110 V a.c. ..................................................................... ..... ..... 2
24 V a.c. ....................................................................... ..... ..... 3
85...253 V a.c./d.c. with supply output: 24 V/30 mA* .............. 4
20...40 V a.c./d.c. with supply output: 24 V/30 mA* ................ 5
Units:
see table 9 .................................................................. ..... ..... ..... XX
Version:
standard ..................................................................... ..... ..... ..... ..... 00
non-standard settings ........................................ ........ ..... ..... ..... ..... NS
custom-made **.................................................. ........ ..... ..... ..... ..... XX
Language:
Polish .......................................................................... ..... ..... ..... ..... ..... P
English ........................................................................ ..... ..... ..... ..... ..... E
other** ................................................................ ........ ..... ..... ..... ..... ..... X
Acceptance tests:
without extra quality inspection requirements ... ........ ..... ..... ..... ..... ..... ..... 0
with an extra quality inspection certificate ................. ..... ..... ..... ..... ..... ..... 1
acc. to customer’s request **...................................... ..... ..... ..... ..... ..... ..... X
8. ORDER CODES
Table 7
* This output is only in N2XS, and N2XT meters
** The code number is established by the manufacturer