A M Bromley Limited Datasheet Addendum Sensors: External Canister TmsDatasheetAddendumV4 A M Bromley Limited West Road House 26a West Road Buxton Derbyshire SK17 6HF UK web: www.tiremonitorsystem.com email: enquiry@ambromley.co.uk phone: +44 (0) 1298 77166 fax: +44 (0) 1298 22044 2022 A M Bromley Limited Preliminary TmsDatasheetAddendumV4-page i Table of contents 1.1. 1.1.1. Important Notices ............................................................................................................... ii 1. External Sensors for Large Bore Valve .............................................................. 1 Fitting ........................................................................................................................ 1 TMS23 and TMS24A external sensors ........................................................... 1 Operating environment ............................................................................................. 1 Measurements .......................................................................................................... 2 Hibernation ............................................................................................................... 2 Periodic transmissions ............................................................................................. 2 Transmit on change.................................................................................................. 3 Sensor life ................................................................................................................ 3 Radio transmissions ................................................................................................. 3 Physical characteristics ............................................................................................ 4 1.2. 1.3. 1.4. 1.5. 1.6. 1.7. 1.8. 1.9. Important Notices It is your responsibility to fully consider the implications of installing TMS sensors, and take adequate precautions to ensure the installation does not compromise the integrity of the wheel or the overall safety of the vehicle. In addition, you must accept responsibility for carrying out inspection and testing of the sensors to ensure they remain suitable for use. TMS is not a safety device and does not replace the need for regular tire maintenance. Please do not remove any labels or identification marks on the products you have purchased, as these will help us to identify them if you should need to contact us or return them. Warning: do not modify the product supplied. TMS23:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation Caution per 47 CFR 15.21: changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 550mAh TMS23, TMS24 contain one non-rechargeable lithium battery. is a registered trademark of A M Bromley Limited TmsDatasheetAddendumV4-page ii Preliminary 2022 A M Bromley Limited External Sensors for Large Bore Valve 1. TMS sensors measure pressure and temperature and estimate their own battery condition. Every sensor has a unique identity code (ID). The four-digit ID code is printed on the product. Periodically and on certain conditions, each sensor broadcasts its ID and measurements as a radio transmission. The TMS Canister can be screwed directly onto a large bore valve without the need to remove the valve stem. The key features are:
TMS24, our standard sensor:
433.92MHz compliant with ETS 300-220 for mounting externally large bore for use in clean dry tires TMS23, standard except:
like the TMS24A except that it has reduced transmission power for compliance with FCC Part15.231. lower transmission range. Fitting 1.1. Due to the wide variety of applications, our customers have used different methods of fitting sensors. You should conduct tests to determine the best method for your application. TMS23 and TMS24A external sensors 1.1.1. The brass adapter of the canister fits onto standard large bore valve thread (0.482-26THD). There is no need to remove the valve core; simply screw on the sensor. Do not exceed a torque of 5 N m when tightening the canister to the valve stem. You can use a locking nut to secure the canister onto the valve stem, maximum torque 8 N m. Although the canister housing is tough, it must be protected from knocks to help protect the valve stem. Some of our customers have designed brackets to further support and protect external sensors. 1.2. Parameter description Operating temperature OTR tire sizes, rim diameter OTR tire speed Chemical resistance Operating environment Sensor All All All All Min Typical Max
-25(1) 24 Units C
+80 63 inch 50 Km/h use with clean dry air, no corrosive gasses. Note 1:
Sensors do not transmit below this temperature 2022 A M Bromley Limited Preliminary TmsDatasheetAddendumV4-page 1 1.3. We calibrate each sensors pressure measurement during manufacture. Measurements Sensors need to measure temperature in order to make an accurate pressure reading. The measurement may be of use depending on where sensors are mounted, bearing in mind that it is the temperature at the sensor PCB, not necessarily the air or tire. Parameter description Sensor Min Typical Max Pressure range Pressure resolution Pressure accuracy up to 150psi Pressure accuracy 150psi to 185psi Pressure long term drift Temperature range Temperature resolution Temperature accuracy Note 1:
at 25C(3) All All All All All All All TMS23 TMS24 0.42 6.0 13 185 0.07 1.0
+/-0.14
+/-2.0
+/-0.21
+/-3.0
+/-0.014
+/-0.2 1.0
+/-2.0
-25
+80(2) Units bar (1) psi (1) bar psi bar (1) psi (1) bar (1) psi (1) bar /Year psi/Year C C C Absolute pressures, relative to a vacuum. To convert to gauge pressure, subtract atmospheric pressure, typically 14.7psi. Sensors attempt to measure up to 125C, but we cannot guarantee they will work outside the operating temperature, see 1.2. Temperature accuracy will deteriorate as the temperature deviates from 25C. 2:
3:
Hibernation 1.4. We ship all sensors in a state of hibernation. This means they do not transmit until they are pressurised. Once pressurised, sensors will remain active until you return them to hibernation. You can return them to hibernation by reading them with a Sensor Reader. If you use a Sensor Reader to read a sensor that is pressurised the sensor will hibernate but immediately become active again. You can also put sensors into a state of deep hibernation by subjecting them to a partial vacuum. This may improve sensor life (see 1.7) if the sensor is kept in storage. Parameter description Leave hibernation and deep hibernation above pressure Time to leave hibernation Time to leave deep hibernation Enter deep hibernation below pressure Note 1:
Sensor Min Typical Max All All All All 0 0 1.38 20.0 0.49 7.0 Units bar (1) psi (1) 10 Seconds 90 Seconds bar (1) psi (1) Absolute pressures, relative to a vacuum. To convert to gauge pressure, subtract atmospheric pressure, which is typically 14.7psi at sea level. 1.5. When sensors are not hibernating, they transmit periodically. Periodic transmissions Parameter description Periodic transmission interval Sensor All Min Typical Max Units 280 300 320 Seconds TmsDatasheetAddendumV4-page 2 Preliminary 2022 A M Bromley Limited Transmit on change 1.6. In addition to the periodic transmissions, sensors also transmit if there has been a change of pressure:
an increase or a decrease, since the previous transmission. When a sensor detects a change, it transmits the new pressure once immediately and then makes a number of extra transmissions at subsequent sample intervals. Parameter description Sensor Min Typical Max Change of pressure Reaction time: this is time between change of pressure and first transmission. Extra transmissions Gap between extra transmissions (1) All TMS23A TMS24 All TMS23 TMS24 10 1.8 0.35 5.0 1.3 1.3 3 11 2.5 Units bar psi Seconds Seconds 12 3.2 12 3.2 Note 1:
Sensors have a deliberate random time variation between transmissions. Sensor life 1.7. Sensors have a limited life because they have an integrated battery that you cannot replace when it has discharged. When the battery is discharged the sensor stops transmitting. Life depends on many factors including the number of transmissions and the temperature throughout the sensors life. The sensors estimate their remaining life and, after every 11 normal transmissions, they transmit their remaining life. Parameter description Sensor life Units Years This is time in service, not including hibernation. Each year, a sensor is in hibernation reduces its service life by approximately 0.3 years. Maybe less in deep hibernation. Sensor All Typical 2.0(1) Max Min Note 1:
1.8. Parameter description Radio transmissions Transmission frequency Modulation type Emission compliance Sensor Min Typical Max All All TMS23 433.92 FSK FCC Part15.231 TMS24 EN 300-220 Units MHz Effective radiated power (ERP) approximate Burst duration Burst gap duration Total duration (2 bursts) TMS23 TMS24 All All All 1 100 52 19 123 W 60 ms 20 ms 140 ms 2022 A M Bromley Limited Preliminary TmsDatasheetAddendumV4-page 3 1.9. Physical characteristics Mass Enclosure material Glass filled nylon 66 30% glass filled 70 g TmsDatasheetAddendumV4-page 4 Preliminary 2022 A M Bromley Limited