Hu-53

Dewpoint Transmitters

Chilled Mirror Technology

RTD (4-wire) or 4 to 20 mA, which

can be scaled over 3 different

temperature ranges of 0 to 100°F, 

0 to 50°C, and -40 to 140°F. Either

output can be directly connected to

a panel meter, controller, or data

acquisition system.

Specifications

Accuracy: ±1.0°F, max

Repeatability: ±1.0°F, max

Hysteresis: None

Response Time:

2-min, duct/pipe; 4-min, wall

Power: 24 ±6 Vdc @ 350 mA;

24 Vac @ ±10%; 115 Vac @ ±10%;

230 Vac @ ±10%

Power Consumption: 10 W max

The RHCM Series is a family of 

low-cost, high-performance chilled

mirror dewpoint transmitters. 

The sensor provides accurate 

long-term repeatability and high

reliability for process control and

energy management. The RHCM-10

sensor electronics are housed in a

rugged enclosure that can be wall

mounted for climate control. The

RHCM-20 and RHCM-30 sensors

are designed to be either pipe or

duct mounted for process control 

in HVAC/energy management

applications. Field calibration is 

not required and ambient

temperature effects, hysteresis, 

and calibration drift with age are 

all virtually eliminated.

The RHCM Series offers a wide

range of user-specified power inputs

including 24 Vdc, 24 Vac, 115 Vac,

and 230 Vac, encompassing many

applications. The user-specified

outputs include 100 Ω Platinum 

 No Routine 

Calibration Needed

 Minimum Drift

 ±1°F Dewpoint Accuracy

 24 Vdc, 24 Vac, 115 Vac,

and 230 Vac Power

Available

 RTD Simulator or 

4 to 20 mA Output

Applications

 HVAC/Energy

Management

 Clean Rooms

 Dry Rooms

 Computer Rooms

 Environmental

Laboratories

 Semiconductor

Manufacturing

RHCM Series

Starts at

$

1421

RHCM-20 duct

mount, $1421

RHCM-30 pipe

mount, $1453

RHCM-10 wall mount, $1575

All models shown smaller than actual size.

RTD Output: 100 Ω Pt, 4-wire

Operating Range, Sensor:

-18 to 71°C (0 to 160°F)

Current Output: 4 to 20 mA, scaled 

to range of 0 to 100°F, 0 to 50°C or 

-40 to 140°F; all ranges also provide 

1 to 5 Vdc using 250 Ω shunt

Operating Range, Housing: 

0 to 50°C (32 to 120°F)

Flow Rate: 300 to 3000'

per minute (duct/pipe mount)

Max Pressure: 0 to 5 psig

Humidity: 10 to 90% RH @ 27°C (80°F)

Ship Weight: 4.55 kg (10 lb)

Dry Weight: 2.73 kg (6 lb)

† Refer to footnote on page Hu-54 for NIST

calibration ordering information.

Optional†
Hu-54

H

u

To Order (Specify Model Number)

Model No. Price Description

RHCM-10-(*)-(**) $1575 Wall mount dewpoint transmitter

RHCM-10T-(*)-(**)-(***) 1803 Wall mount dewpoint/temperature transmitter

RHCM-20-(*)-(**) 1421 Duct mount dewpoint transmitter

RHCM-30-(*)-(**) 1453 Pipe mount dewpoint transmitter

TX4-100 35 4 conductor shielded transmitter cable, 30 m (100')

CAL-3-HU† 125 NIST-traceable calibration

PSR-24S 60 Regulated power supply, US plug, 90 to 264 Vac input, 24 Vdc output, 400 mA, screw terminals, UL

PSR-24L 60 Regulated power supply, US plug, 90 to 264 Vac input, 24 Vdc output, 400 mA, stripped leads, UL

PSR-24L-230 60 Regulated power supply, European plug, 230 Vac input, 24 Vdc output, 400 mA, stripped leads, CE

PSU-93 40 Unregulated power supply, 16 to 23 Vdc, 300 mA max, screw terminal

Order Code Add’l Price Description

1 N/C 24 Vdc

2 $182 24 Vac

3 182 115 Vac

4 182 230 Vac

Order Code Add’l Price Output (Scale)

PT100 N/C 100 Ω RTD

100F $167 4 to 20 mA (0 to 100°F)

50C 167 4 to 20 mA (0 to 50°C)

140F 167 4 to 20 mA (-40 to 140°F)

Comes complete with operator’s manual.

* Insert power code from power supply options chart (1, 2, 3 or 4).

** Insert output code for dewpoint range from the output options chart (PT100, 100F, 50C or 140F). 

*** Insert second output code for ambient temperature output from the output options chart (PT100, 100F, 50C or 140F). 

Ordering Examples: RHCM-10T-1-50C-50C, dewpoint/temperature transmitter with 24 Vdc power, a dew point output of 4 to 20 mA 

(0 to 50°C) and an ambient temperature output of 4 to 20 mA = 0 to 50°C with CAL-3-HU, NIST-traceable calibration, 

$1803 + 167 + 167 + 125 = $2262.

RHCM-10-1-PT100, dewpoint/temperature transmitter with 24 Vdc power, a dew point output of 100 Ω RTD, $1575.

104.14 (4.10) SQ. MAX

68.58

(2.70)

MAX

85.60

(3.37) 

TYP

8.89

(0.350)

TYP

209.55

(8.25)

MAX

 

4.83

(0.19)

TYP

DUCT MOUNT

SENSOR

63.5 (2.5) MIN

to 101.6 (4.0) MAX

1 NPT

1" COMPRESSION

FITTING

AIR INLET

OPENINGS

25.4

(1.00)

MAX

SENSOR

SPONGE GASKET

DUCT MOUNTING PLATE 107.95

(4.25)

MAX

152.4 (6.00) MAX

} PIPE MOUNT SENSOR

25.4

(1.00)

DIA.

MAX

HIGH DIMPLE

ON "B" HOLES METAL BASE

PLASTIC COVER

(FIRE-RETARDANT ABS)

AIR THERMOMETER &

SHIELD (OPTIONAL)

SAMPLE AIR

INTAKE PORT

10.16

(0.40)

MIN.

166.37

(6.55)

SAMPLE AIR

OUTLET PORT

(1.0") MIN

CLEARANCE

REQUIRED

 

120.65

(4.75)

66.04

(2.6)

MAX

25.4

(1.0) DIA. 86.36

(3.40)

2.54 (0.10)

Output Options Power Supply Options

RHCM-10 Dimensions: mm (in)

MOST POPULAR MODEL HIGHLIGHTED!

RHCM-20 and RHCM-30

Dimensions: mm (in)
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