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User manual
Firmware version V2.0
8.5.2008
FTR262
Universal wireless transmitter
Pt100, TC, mV, mA and V inputs
Nokeval
FTR262 User Manual
DESCRIPTION
FTR262 is a wireless transmitter that has universal input and can be powered using batteries or
24 VDC power supply. It is housed in a field enclosure (IP65) and equipped with detachable screw post connectors for inputs and power supply.
The wireless concept allows easy implementation, installation and expansion of a measuring system even in difficult locations and installation sites. The transmitter is programmable for transmission intervals from 5 seconds to 5 minutes and for the following inputs: Pt100, Ni, Cu, universal thermocouple (mV + cold junction temperature), ohms, millivolts, milliamperes and volts up to 100 VDC.
Measured values are transmitted using license free 433.92 MHz frequency band (ISM) so FTR262 can be freely used, for example, almost in whole Europe.
Manufacturer
Nokeval Oy
Yrittäjäkatu 12
FI-37100 Nokia
Finland
2
Tel: +358 3 3424800
Fax: +358 3 3422066
Web: www.nokeval.com
Technical support: [email protected]
FTR262 User Manual
SUPPLY VOLTAGE
FTR262 can be powered using standard AA batteries or external 24 VDC power supply. Note that the supply voltage selection jumper must be configured accordingly.
Installing/replacing the batteries
Open the case, match the batteries to the + and - marks inside the battery holder and insert the batteries. Set also the supply voltage selection jumper to batteries position.
External power supply
FTR262 can be powered connecting 8...30 V external power supply to connector B. Open the case and connect the positive wire of the supply voltage to terminal 1 and the ground wire to terminal 2.
Set also the supply voltage selection jumper to external power supply position
+
–
1 2 3 4 5 6
Connector A
Inputs
–
+
1
2
3
Supply voltage selection
Batteries
External 8...30 VDC power supply
1
2
3
Connector B
External supply voltage
8...30 VDC
GND
3
FTR262 User Manual
SETTINGS
Use MekuWin program and programming cable or Nokeval 6790 hand held programmer to configure the device. You can download MekuWin from Nokeval’s web site www.nokeval.com for free.
Connection settings
Communication settings for configuration:
• baud rate 9600
• protocol SCL
• address 0
Programming connector
The device has a 3PIN POL programming connector. Use POL-3PIN adaptor to connect a POL-
RS232 cable, DCS772 (USB-POL converter) or 6790 to the device. The 3PIN POL programming connector can be connected in both ways.
When the programming connector is connected the device sends measurement data about three times per second. When the configuration connection is open no measurement data is sent.
Menu
FTR262 menu structure
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FTR262 User Manual
INPUTS
Settings
The configuration menu is divided in several submenus. The input settings are in a submenu called
In.
In submenu
Sensor
Input range and sensor selection.
• Pt, Ni and Cu: Resistance thermometers (RTD’s). The nominal resistance is set in R0 (see below). The reading is in Celsius.
• Ohm: Resistance input. The resistor is connected in two-wire, three-wire or four-wire connection.
The reading is in ohms.
• mV: Voltage input -30...2000 mV.
• V: Voltage input -600 mV...100 V.
• mA: Current input 0...25 mA.
• TC: Thermocouples.
Note! FTR262 doesn’t do linearization. If TC is selected, the result is sent in millivolts. In addition, the device measures and sends the cold junction temperature. The result is linearized in the receiving system (for example, PromoLog or FTR/RTR970-PRO)
4W
• No: Three-wire RTD connection.
• Yes: Two-wire or Four-wire RTD connection.
See the connections chapter for details.
R0
The nominal resistance of a resistive temperature sensor. With Pt and Ni sensors, this is the resistance at 0°C, e.g. with Pt100 set R0=100. With Cu the nominal resistance is given at 25°C.
If the real resistance of the sensor at the nominal temperature is known, it can be fed here, in order to cancel the sensor error.
Pts
Number of scaling points. The scaling means converting the reading to represent some other
(engineering) reading. The scaled value is used on the display, serial output, analog outputs, and alarms.
• 0: No scaling.
• 1: One point offset correction. The reading corresponding to Mea1 is scaled to be Sca1 when displayed, using appropriate offset value.
• 2: Two point scaling. Readings from Mea1 to Mea2 are scaled to be Sca1 to Sca2 on the display and other outputs. Any values can be used, these do not have to be the end points.
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FTR262 User Manual
Mea1, Sca1, Mea2, Sca2
Scaling points. Visibility of these settings depend on the Pts setting. Unscaled reading Mea1 is converted to Sca1, and Mea2 to Sca2. These scaling points can be conveniently used to calibrate a sensor-transmitter pair in a thermal bath. First set the scaling off by setting Pts=0. Apply one or two known temperatures to the sensor and write down the displayed and the real temperatures.
Then set Pts to 1 or 2 depending on the number of calibration points, and write the first reading in Mea1 and the real temperature in Sca1. And the same with Mea2 and Sca2 if two points are calibrated.
Connections
When using external power supply note that the inputs are not galvanically isolated from supply voltage.
Resistance input
Two-wire connection
Connect the sensor to terminals two and three. Terminal two is the measurement current source. Note that terminals one and two must be connected, as do terminals three and four.
Two-wire measurement is not recommended to be used with long wires, because the resistance of wires affects to the result.
You must enable four-wire (4W) measurement in settings.
Three-wire connection
Connect the sensor to terminals two, three and four. Terminal two is the measurement current source. Note that all conductors should be equal in length and have equal cross-sectional area.
You must disable four-wire (4W) measurement in settings.
Four-wire connection
Connect the sensor to terminals one, two, three and four. Terminal two is the measurement current source. Four-wire measurement is the most accurate way to measure sensor’s resistance because the resistance differences in conductors have no effect.
6
You must enable four-wire (4W) measurement in settings.
FTR262 User Manual
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FTR262 User Manual
RADIO TRANSMITTER
The device sends the measurement data using license free 433.92 MHz frequency range.
Settings
Radio transmitter configuration is done in Out submenu.
Out submenu
Period
Number of periods between consecutive transmissions. The minimum value for this setting is two and maximum value is 127.
One period is approximately 2.7 seconds
(25 °C). The duration of a period depends on temperature and varies from 1.5 to 3 seconds.
When using batteries, it is not recommended to set the period value smaller than necessary because it has a quite significant effect on battery life.
Maximum number of transmitters
Period
2
11
22
67
127
Nominal Interval
5 s
30 s
1 min
3 min
5 min 40 s
The maximum number of radio transmitters in a coverage area is limited by radio standards. The use of repeaters reduces the maximum number of transmitters because repeaters use the same frequency channel as transmitters. The following example table shows the allowed maximum number of FTR262 transmitters in a coverage area.
Transmission
Interval (s)
40
50
60
70
5
10
20
30
80
90
120
240
Receiver
Receiver and
1 repeater
Receiver and
2 repeaters
Maximum number of transmitters
11 22
43
87
130
174
217
261
304
348
391
522
1043
22
43*
65
87
109
130
152
174
196
261
522
58
72
87
101
7
14
29
43
116
130
174
348
For example, if you have transmission interval of 20 seconds and one repeater, the maximum number of transmitters is 43*.
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FTR262 User Manual
The collision probability of radio data packets increases when the number of transmitters in a coverage area increases or the transmission interval decreases. The following picture shows how the collision probability raises as the number of transmitters increases.
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FTR262 User Manual
SPECIFICATIONS
mV
Range
Accuracy
Thermal Drift
Load
V
Range
Accuracy
Thermal Drift
Load
mA
Range
Accuracy
Thermal Drift
Load
Inputs
Pt100
Range
Accuracy
Thermal Drift
-200…700 °C
0.05% rdg + 0.25°C
0.02°C/°C
Ni100
Range
Accuracy
Thermal Drift
Cu10
Range
Accuracy
Thermal Drift
-60…180 °C
0.05% rdg + 0.25°C
0.02°C/°C
-200…260 °C
0.05% rdg + 0.25°C
0.02°C/°C
Thermocouples
Accuracy Cold junction
0...40 °C ±0.75 °C
-30...60 °C ±1.5 °C
Thermocouple: See mV
-30...2000 mV
0.05 % rdg + 0.01 mV
50 ppm/°C
>1 MΩ
-600 mV...100 V
0.05 % rdg + 0.01 V
50 ppm/°C
>1 MΩ
0...25 mA
0.008 mA
50 ppm/°C
50…80 Ω
Supply voltage
2 x 1.5 V alkaline AA batteries or external 8...30 VDC power supply
5.0
4.0
3.0
2.0
1.0
0.0
0
Estimated Battery Life Time (25 °C)
5 10 15 20
Transmission Interval (s)
25 30
The use of ”heavy duty” or ”long life” batteries is recommended. Replace both batteries at the same time and with the same type.
Because alkaline batteries are prone to leak over time it is recommended to change the batteries after few years.
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Environment
Oper. temperature -30...+60 °C
Protection class IP65
Compatible radio devices
Nokeval MTR, RTR and FTR series radio devices.
Dimensions
Case: 80 mm x 130 mm x 60 mm (WxHxD)
130 mm
80 mm
Antenna: 178 mm, Ø 8...16 mm
60 mm
FTR262 User Manual
Radio transmitter
Antenna connector: 50 Ω female BNC
connector
Standard antenna: Quarter-wave whip
antenna (BNC connector)
Frequency range: License free 433.92 MHz subband f according to
ERC/REC/70-03
Coverage area:
• Open space: up to 500 m
• Indoors typically 50...100 m
Configuration
Connector: 3PIN POL programming connector
Protocol: Nokeval SCL protocol
Configuration: PC with Mekuwin for Windows 98...XP or
6970 hand held programmer
Regulations
EMC directive
• EMC immunity EN 61326
• EMC emissions EN 61326, class B
R&TTE directive
• EN 300 220 class 3,
Transmitter power class 8 (10 mW)
• EN 301 489
• EN 300 339
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FTR262 User Manual
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