Omega Products RHCM-10-1-100F User Manual

Dewpoint Transmitters
Chilled Mirror Technology

RHCM Series

Starts at

$

1421

†

Optional

⻬ No Routine

Calibration Needed

⻬ Minimum Drift
⻬ ±1°F Dewpoint Accuracy
⻬ 24 Vdc, 24 Vac, 115 Vac,

and 230 Vac Power
Available

⻬ RTD Simulator or

4 to 20 mA Output

Applications

⻬ HVAC/Energy

Management

⻬ Clean Rooms
⻬ Dry Rooms
⻬ Computer Rooms
⻬ Environmental

Laboratories

⻬ Semiconductor

Manufacturing

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

RHCM-20 duct
mount, $1421

RHCM-30 pipe
mount, $1453

All models shown smaller than actual size.

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

Hu-53

RHCM-10 wall mount, $1575

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.

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 AI R

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)

RHCM-20 and RHCM-30

Dimensions: mm (in)

RHCM-10 Dimensions: mm (in)

H

u

Output Options

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)

To Order

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
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

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.

(Specify Model Number)

†

125 NIST-traceable calibration

Power Supply Options

Order Code Add’l Price Description
1 N/C 24 Vdc
2 $182 24 Vac
3 182 115 Vac
4 182 230 Vac

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Hu-54