Sample Request

STO

Temperature Sensor & Transmitter

outdoor type, PT & NTC type sensing elements, transmitters

STx Series Temperature Sensors and Transmitters are especially used for HVAC Systems as supply or extract air temperature sensors. The device can be used as limit, reference, or measuring sensor. The basic advantages are easy mounting, high protection class‐IP67, screwless electrical connector. There are many types of thermistors and RTD’s such as PT100, PT1000, NTC10k, NTC20k, NTC3k, NTC1,8k. Also transmitters have 4‐20mA, 0‐5V, 1‐5V, 0‐10V and 2‐10V outputs.

•  Maintenance free PT and NTC sensing elements
•  0…10 V output with AC 24 V or DC 13.6…34 V power supply
•  4-20 mA, 2-wired output with DC 13.6…34 V power supply
•  Simple and fast mounting
•  Screwless cover and electrical terminals
•  3 Segment display option

Electrical
Power Supply : AC 24V  (± %5), 50-60 Hz or DC 13.6…34 V
Power Consumption : max. 1.5 W

Outputs
NTC or PT Types: check the RT tables
current: 4…20 mA, maximum 500 ohm
voltage: 0…10V DC, minimum 1.000 ohm

Accuracy
NTC: 0.5°C around 25°C
PT: 0.3°C around 0°C
0-10 V: 0.3°C between 0°C…50°C
4-20 mA: 0.3°C between 0°C…100°C

General Data
Sensing Element : NTC or PT
Operating Temperature NTC:  -40 …+125°C
Operating Temperature NTC:  -50 …+250°C
Storage Temperature : -30 …+85°C

Ranges
0-10 V: Set at the factory upon customer’s request
4-20 mA: Set at the factory upon customer’s request

Connections
Terminals : Spring clamp terminal
Cable : maximum 2.5 mm2
Cable Gland : M16 or PG9

Protection
IP class : IP 54
NEMA class : 3S

Standards
EMC Directive : EN 61326-1
CE Conformity : 0616CE.01

Dimensions
Housing : 69.0 x 40.0 x 30.0 mm
Probe Duct: 6 (diameter) x 200 (lenght) mm
Probe Immersion: 6 (diameter) x 100 (lenght) mm
Weight Packed : 60 gr

NTC Termistors

STO11 … NTC 1.8k
STO12 … NTC 2.2k
STO13 … NTC 3k
STO14 … NTC 5k
STO15 … NTC 10k
STO16 … NTC 20k

RTD Elements

STO21 … PT100
STO22 … PT1000
STO23 … Ni1000

mA Output

STO31 … 4-20 mA, 2-wire
STO32 … 4-20 mA, 3-wire

V Output

STO41 … 0-10V
STO42 … 2-10V
STO43 … 0-5V
STO44 … 1-5V

Special Requests

other elements and features are on request

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