Surface contact temperature/ tube contact temperature measuring ALTM 2 - Modbus - T3
temperature Temperature

Surface contact temperature/ tube contact temperature measuring THERMASGARD® ALTM2-Modbus-T3

Product group: WG01

Low availability.

Usually ships in 3 to 5 days
184,63 €
219,71 € incl. VAT + shipping


Surface contact temperature/ tube contact temperature measuring THERMASGARD® ALTM 2 - Modbus - T3
Calibratable surface-contact temperature measuring transducer (detached variant) THERMASGARD® ALTM 2 - Modbus - T3, with Modbus connection, in an impact-resistant plastic housing with quick-locking screws, cable sensor with pipe feeder, incl. strap, optionally with/ without display, measures temperature (–50...+150 °C). International system of units SI (default) can be changed to imperial (via Modbus).

The pipe surface-contact sensor is used to detect the temperature on lines, pipes (e.g., cold and warm water) or on heating sections for heating control.
Innovative Modbus sensor with galvanically separated RS485 Modbus interface, selectable bus termination resistance, DIP switch for setting the bus parameters and bus address in current-free state, internal LEDs for telegram status display, two separate push-in terminals and large three-line display (illuminated, with customised programming in the 7-segment range and dot-matrix range). Uses internal diagnostics to detect sensor breakage or sensor short circuit as errors. The error messages can be retrieved via Modbus and are shown on the display. The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.

Technical details

Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Power consumption
< 1.2 W/ 24 V DC; < 1.8 VA/ 24 V AC
Measuring range, temperature
–50...+150 °C
Temperature deviation
typically ± 0.2 K at +25 °C
Pt1000, DIN EN 60751, class B
(Perfect Sensor Protection)
Measuring range
–50...+150 °C
Tmax up to +100 °C (compact variant)
Zero point offset
± 10 °C
Ambient temperature
Measuring transducer –30...+70 °C
clean air and
non-aggressive, non-combustible gases
Error detection
sensor breakage, sensor short circuit
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
0,3 s / 1 s / 10 s
Process connection
endless metal strap and metal tightener
(included in scope of delivery)
Strap dimensions
Ø = 13 - 92 mm (¼ - 3"), L = 300 mm
Electrical connection
0.2 - 1.5 mm², via push-in terminal
Cable connection
cable gland, plastic
(M 20 x 1.5; with strain relief, exchangeable,
inner diameter 8 - 13 mm) or
M12 connector according to DIN EN 61076-2-101
(optional on request)
Cable gland
2x M 20 x 1.5; with strain relief, replaceable,
inner diameter 8 - 13mm
sensor cable
Silicone, SiHF, 2 x 0,25 mm²; cable length (KL) = 1.5m
(other lengths and jacket materials, e.g. PTFE or
glass fibre with steel mesh, available on request)
Protection class
III (according to EN 60 730)
Protection type
IP 65 (according to EN 60 529) humidity-tight stamped
IP 68 (optional watertight compound-filled) rolled
switchable metric / imperial
Internal diagnostics
Error 1 at sensor breakage
Error 2 at sensor short circuit