Product guide

35
Humidity and Dew-Point Instruments
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
www.michell.com
HVAC
RM33 & 52
Relative Humidity and Temperature Transmitter, HVAC Room Monitor
The RM series of relative humidity and temperature
transmitters offers a comprehensive range of output signals
and measurement ranges. The transmitters are housed in a
wall mounting enclosure making these instruments ideal for
HVAC and building management applications.
Highlights
• Designed for low cost HVAC applications
• Quick installation: electrical rear connection with screw
terminals
• Long term stability
Technical Specifi cations
Performance
Measurement range (RH) 0–100% RH
Measurement range (T) 0 to +50°C (+32 to +122°F)
Accuracy at 23°C (73°F)
Humidity
RM52: <±2% RH (10–90% RH)
RM33: <±3% RH (30–80% RH)
Accuracy at 23°C (73°F)
Temperature
RM52: ±0.2°C (±0.36°F)
RM33: ±0.3°C (±0.54°F)
Temperature infl uence ±0.05% RH/°C (±0.027% RH/°F)
Stability – RH Sensor ±1% RH/year
Response time – RH Sensor <10 sec typical (for 90% of the step
change)
Electrical output/input
Output signal 0–1, 0–5, 0–10 V
4–20 mA (2-wire)
Supply voltage 14–35 V DC (for 0–5 / 0-10 V output)
4.5–35 V DC (for 0–1 V / 4-20 mA {RH
only} output)
14–26 V AC (for all output ranges)
Supply voltage infl uence ±0.01% RH/V typical
Operating conditions
Operating humidity
Housing, Storage 10-90% RH
Operating temperature
Electronics
Storage
0 to +50°C (+32 to +122°F)
-40 to +75°C (-40 to +167°F)
PRT
Measurement range Pt100/1000:
-50 to +200°C (-58 to +392°F)
Accuracy Pt100/1000: ±0.15%
Mechanical specifi cation
Ingress protection N/A
Housing material White molded polymer
Dimensions 91 x 91 x 25.5mm (3.58 x 3.58 x 1.00”)
Filter N/A
Weight 85g (3oz)
Electrical connections Screw terminals
Dimensions
Issue No: RM33&52_97182_V2_UK_1110