ETS68 Temperature and Relative Humidity Transmitter thumbnail 1

Senseca

ETS68 Temperature and Relative Humidity Transmitter

Temperature and relative humidity transmitter with optional barometric pressure, for clean rooms and high-performance indoor environments.

Temperature −40…+80 °C and RH 0…100 %, with optional pressure 300…1100 hPa
RS485 Modbus-RTU output, with two optional analog outputs (0…1 V, 0…5 V or 0…10 V)
Factory calibrated in multiple points for RH, ready to use. Ø14 mm PBT housing, IP65

Quantity

Overview

ENVIROsense ETS68 is a temperature and relative humidity transmitter with standard RS485 Modbus-RTU output and optional barometric pressure measurement. It is the Clean Rooms / High performance version, built for indoor environments where reliability and robustness are key factors. It is supplied factory-calibrated in multiple points for relative humidity, ready to use, in a rugged Ø14 mm PBT housing (IP65).

Typical applications

Designed for indoor environments where accurate and reliable measurement matters.

Clean rooms
High-performance indoor environments where high reliability and robustness are key factors
OEM applications, as it works with any Modbus-RTU master device via its M12 connector

Key Features

Accurate, compact and flexible transmitter with RS485 Modbus-RTU output.

Centesimal temperature and humidity resolution (0.01 °C / 0.01 %RH)
Multi-point relative humidity calibration; optional ISO/IEC 17025 calibration certificate
RS485 Modbus-RTU or ASCII proprietary protocol output
Two optional additional 0…1 V, 0…5 V or 0…10 V analog outputs (depending on model), with configurable temperature and relative humidity or dew point ranges
Optional barometric pressure sensor (300…1100 hPa)
Many calculated humidity quantities: dew point, wet bulb temperature, absolute humidity, mixing ratio, specific enthalpy, water vapour partial pressure, specific humidity, frost point temperature, saturation vapour pressure above water and above ice
Low power consumption: 1.2 mA @ 24 Vdc
Meets WMO requirements

Benefits

Clean room confidence: designed for clean rooms and high-performance indoor environments
High RH accuracy: ±1.2% RH from 0…85% at 5…50 °C
Fast response: RH response time < 10 s with P8 filter at 2 m/s air speed
Easy integration: RS485 Modbus-RTU output connects to Modbus master devices via M12
Compact protection: Ø14 mm PBT housing with IP65 protection
Ready to use: factory-calibrated at multiple RH points for faster commissioning

Specifications

MEASUREMENT SPECIFICATIONS
Sensor	RH: Capacitive Temperature: Pt100 Pressure: Piezoresistive
Measuring range	RH: 0…100% Temperature: -40…+80 °C Pressure: 300…1100 hPa
Resolution	RH: 0.01% Temperature: 0.01 °C Pressure: 0.1 hPa
Accuracy	RH: ±1.2% (0…85%) / ±2% (85…100%) @ T=5…50 °C; ±(1.5 + 1.5% of measured value)% @ T= remaining range Temperature: ±0.1 °C ± 0.1% of the measured value Pressure: ±0.5 hPa typical @ T=25 °C; ±1 hPa (500…1100 hPa) @ T= full range
RH response time (t63, 10 → 80 %RH)	< 10 s (with P8 standard filter, air speed=2 m/s @ constant temp.)
Warm-up time	600 ms
Long-term drift	RH: ±0.5 %RH/year Temperature: ±0.03 °C/year Pressure: < ±1 hPa/year

GENERAL SPECIFICATIONS
Operating conditions	-40…+80 °C / 0…100 %RH
Output	RS485 Modbus-RTU or ASCII proprietary protocol 2 optional additional 0…1 V, 0…5 V or 0…10 V (depending on model) analog outputs for temperature and humidity
Power supply	7…30 Vdc (except ETSxxM9x) or 4.5…16 Vdc (only ETSxxM9x) for RS485 output 10…30 Vdc for 0…1 V and 0…5 V analog outputs 15…30 Vdc for 0…10 V output
Power consumption	1.2 mA @ 24 Vdc (except ETSxxM9x) 3 mA @ 5 Vdc (only ETSxxM9x)
Connection	4-pole M12 (ETSxxM0… / ETSxxM9…) 8-pole M12 (ETSxxMW… / ETSxxMX… / ETSxxMY…)
Weight	30 g approx
Material	PBT
Protection degree	IP65

ORDERING CODES
Format	ETS 68 M [Output] [Barometric pressure]
Application	68 = Clean rooms / High performance
Output	0 = RS485 9 = RS485 "Low Voltage" W = RS485 + analog 0…1 V X = RS485 + analog 0…5 V Y = RS485 + analog 0…10 V
Barometric pressure	0 = No B = Yes