File : CS-SUP-MUTI-WTHERMSPETEC-E02.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw LIST OF UPDATES Update # Description Author Date Comments 1 First edition RCS 22/11/04 Version 1 2 Add-on FCC text RCS 17/02/05 Version 2 REFERENCE DOCUMENTS Ref. DR[1] Title Reference Version Date WaveCard user handbook This device complies with part 15 of the FCC rules.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw TABLE OF CONTENTS 1 PRESENTATION OF THE WAVETHERM MODULE ....................................................................................4 1.1 CHARACTERISTICS..............................................................................................................................4 1.2 SENSOR INTERFACE...........................................................................................................................6 1.2.1 WaveTherm – DALLAS............
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 1 PRESENTATION OF THE WAVETHERM MODULE WaveTherm refers to a range of wireless remote temperature measuring devices, based on Wavenis® Ultra Low Power radio technology of CORONIS offering several years of autonomous battery operation. The industrial design of the WaveTherm module guarantees exceptional communication reliability in harsh working environments and has been optimised to enable large-scale production. 1.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw ➢ Radio frequency characteristics at 433 Mhz – fixed frequency The characteristics indicated below are given for a temperature range of -20°C to 70°C Characteristics Min Typical Operating frequency 433.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 1.2 SENSOR INTERFACE The WaveTherm modules are designed for use in a varied environment. They are therefore available with several types of temperature sensors offering performance characteristics enabling maximum coverage of the module's scope of application. WaveTherm – DALLAS: turnkey module supplied prewired to the probe via a connector. WaveTherm – PT1000: turnkey module offering better performance than the WaveTherm – DALLAS option.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 1.2.2 WAVETHERM – PT1000 The WaveTherm PT1000 module is able to manage 1 or 2 PT1000 temperature probes. The probes are connected to the module with sealed plug-in connectors for connection to 2, 3 or 4-wire probes (type BINDER series 720).
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 1.2.3 WAVETHERM – PT100 The WaveTherm PT100 module is able to manage 1 or 2 PT100 temperature probes. The probes are connected to the module with sealed plug-in connectors for connection, via a shielded cable, to 2, 3 or 4-wire probes (type BINDER series 720, see 1.2.2).
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 1.3 WAVETHERM MODULE OPERATING LIFE The aim of this chapter is to describe the power consumption profiles of the WaveTherm radio frequency module used for temperature measurement in order to estimate the working life of the battery according to the various operating conditions. The Wavenis protocol used in all Coronis Systems products includes several dialogue modes (peer-to-peer, polling, broadcast).
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw ➢ Climate diagram Duration (%) Outdoor 30 % 25 % 20 % 15 % 10 % 5% -20 -10 0 20 40 50 60 Temperature (°C) The climate diagram illustrated above represents the amount of time spent by the module at a given temperature. It is used for calculation of the module operating life. 1.3.2 ESTIMATION OF OPERATING LIFE The initial parameters are the radio polling frequency, population of modules in the area and the datalogging mode parameter settings.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw The solution recommended by Coronis Systems to counter reduction of the operating life in the case of a high module population is to use the polling mode which offers the advantage of transmitting only one frame to read a group of modules. The yellow line below indicates the approximate operating life for a population of 50 modules by polling them in groups of 25 modules.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw ➢ WaveTherm - PT100 ➢ Wavetherm - PT1000 These estimates are naturally taken into consideration in the choice of applications and systems. It is recommendable to use the 'Polling' mode when a high product population within range of each other is noted. The influence of the datalogging mode wake-up period on the module operating life is relatively low.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 2 INFORMATION RELATIVE TO THE PROBES ASSOCIATED WITH THE WAVETHERM MODULES 2.1 DALLAS PROBES 2.1.1 CODING OF TEMPERATURES FOR THE DALLAS PROBE TYPE DS18B20 These probes have a resolution of 12 bits and their value is coded on two bytes (MSB first) Negative values are expressed in two's complements with addition of a sign. Remark: The hexadecimal value 0x4FFF indicates the absence of a probe, or a connection error between the module and the probe.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 2.2 PT100 AND PT1000 PROBES 2.2.1 REPRESENTATION OF TEMPERATURE VALUES Due to the high level of precision required of the temperature values processed by the module, WaveTherm PT100 or PT1000 are true numbers (with a mantissa and exponent). They are represented in the form of a 32-bit floating number. The format used is the standard IEEE format with precision coded on 32 bits (+/-5.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 2.2.2 CALIBRATION OF RADIO MODULE ➢ Factory calibration The precision of PT100 and PT1000 probes is such that the WaveTherm module measurement chain requires calibration. This calibration is carried out automatically in the factory and the product is supplied ready for use. ➢ Re-calibration on site Re-calibration on site is possible under certain conditions. To carry out this operation, it will be necessary to connect two calibration precision resistances.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw The relationship T = f(R) must therefore be calculated according to the relationship provided in standard EN60751. The following polynomial is used: T = C7.R7 + C6.R6 + C5.R5 + C4.R4 + C3.R3 + C2.R2 + C1.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 3 INSTALLATION OF A WAVETHERM MODULE WaveTherm module installation is carried out by connecting the temperature measurement probes to the module. (in general, the modules are supplied with the probes pre-wired) 3.1 MODULE FASTENING Two diagonally opposed holes enable easy screw fastening of the module to a flat surface. Two diagonally opposed holes enable easy screw fastening of the module to a flat surface.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 3.3 REPLACEMENT OF A MEASUREMENT PROBE In the case where a new probe must be installed, the diagram for connection to the module is as follows. ➢ PT100 or PT1000 probes: connectors BINDER series 720, 2, 3, or 4-wire versions are used.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw ➢ DALLAS probe: the connector BINDER series 719, 3-wire version is used.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 4 DATA EXCHANGE PRINCIPLE WITH A WAVETHERM MODULE The WaveTherm module uses the WAVENIS® protocol The choice of mode used is initiated by the read element which uses a different set of commands (see WaveCard document) when sending commands to the WaveCard. The following chart indicates the read modes possible as well as their typical applications.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5 WAVETHERM MODULE FUNCTIONS The WaveTherm modules offer the following functions : Read temperatures immediately, Read temperatures logged, Log and automatically transmit alarm or occurrence signals : • • • threshold detection end of battery life probe fault detection (only used with WaveTherm – PT100) Operating mode management (including clock synchronisation) Read internal parameters (firmware version, radio communication mode,...) 5.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.1.2 READ OHMIC VALUE OF PROBES IMMEDIATELY Compatibility : - WaveTherm – PT100 - WaveTherm – PT1000 In the case of the WaveTherm – PT100 and WaveTherm - PT1000 modules, it is possible to read the probe temperature data in the form of an ohmic value. This read command may be carried out with a preset precision level. In general, precision level 0 is sufficient. The other precision levels are used in difficult environments. 5.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.3 PERIODIC TEMPERATURE READING (DATALOGGING) The Datalogging mode enables periodic logging of temperatures at each input (by selecting the precision index for PT100 and PT1000 probes) (see chapter 5.1.1). The frequency of these readings may be set in three modes: index logging in time steps This type of datalogging is used to log the index value for each input at periods ranging from one minute to over thirty hours.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.4 AUTOMATIC TRANSMISSION OF FAULTS The WaveTherm module offers the possibility to automatically transmit radio frames when an occurrence is detected. The following occurrences may provoke an automatic alarm: Threshold detection (see 5.6 ) End of battery life detection (see 5.8 ) Probe fault (WaveTherm – PT100 only) (see 5.7 ) It is possible to select for each type of occurrence whether or not an alarm frame is to be sent.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.5 WAKE-UP SYSTEM MANAGEMENT In order to reduce module power consumption, a wake-up period parameter setting system is incorporated.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw Case n°1 : Periodic wake-up, without distinction of day of the week Case n°2 : Periodic wake-up in time windows from Monday to Friday. Standard periodic wake-up for the other days. Case n°3 : Periodic wake-up from Monday to Friday. Wake-up disabled the other days. Case n°4 : Periodic wake-up in time windows from Monday to Friday. Standard periodic wake-up on Saturday. Wake-up disabled on Sunday.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.5.2 SET A NEW WAKE-UP PERIOD The WaveTherm module wake-up default setting is every second. The wake-up period may be easily modified by entering a new value in the “default wake-up period parameter'. Attention, the value associated with this parameter may not exceed 10 seconds. 5.5.3 SET A FIXED WAKE-UP PERIOD FOR CERTAIN DAYS OF THE WEEK The wake-up system parameters may be set to allow disabling of WaveTherm module periodic wake-up for certain days of the week.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.6 MANAGEMENT OF THRESHOLD ALARMS The WaveTherm module detects when the values exceed the threshold levels (high or low) for a given period of time. The WaveTherm – PT100 and PT1000 may be configured with a precision level offering a more reliable measurement even in environments with excessive interference (see chapter 5.1.1).
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw ➢ In successive mode, an alarm is detected when the continuous temperature threshold alarm time is higher than the set duration parameter. t1 High threshold Measurement period Alarm With a threshold excess duration, tseuil = 10 measurement periods, one gets t1 > t seuil Regardless of the mode selected, an alarm may be detected immediately if the threshold alarm duration is set to zero. 5.6.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.sxw 5.7 SENSOR FAULT DETECTION (IF ACCEPTED BY THE MODULE) For all modules, temperature probe absence or error detection is carried out during a write request and is indicated by the presence of a specific value which does not correspond to a possible temperature value. However, in the case of the WaveTherm – PT100 module only, after detection of a probe fault, the module carries out the following operations: records the detection date in an internal parameter.
File : CS-SUP-MUTI-WTHERMSPETEC-E02.
