Omega CMDP Series Manuel utilisateur

User’s

Guide

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Series CMDP

A chilled mirror

hygrometer

omega.com

[email protected]m

Servicing

North

America:

U.S.A. Omega Engineering, Inc.

Headquarters: 800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854

Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)

Engineering Service: 1-800-872-9436 (USA & Canada only)

Tel: (203) 359-1660 Fax: (203) 359-7700

e-mail: [email protected]

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and

reserves the right to alter specifications without notice.

Ordering

Configuration

CMDP-D Duct mounted chilled mirror hygrometer (dew point only)

CMDP-

W Wall mounted chilled mirror hygrometer (dew point only)

CMDPT-W Wall mount chilled mirror hygrometer (dew point/air temperature)

CMDP-P Pipe mounted chilled mirror hygrometer (dew point only)

The CMDP overviews

The CMDP series is a family of low-cost dew point chilled mirror transmitter that can be

configured as a duct, wall, pipe, or an OEM unit. The unit offers stable, accurate and

repeatable measurements that are traceable to NIST. Available air temperature option for wall

and OEM configurations. Settable service cycles for balancing and cleaning the mirror. The

CMDP is a primary measurement using a fundamental principle to measure the dew point very

accurately. Simple maintenance to cleaning the mirror requires using a wetted cotton swab to

restore the transmitter to normal operation. Because of its construction, the customer can enjoy

a long life of excellent performance.

FEATURES

1. Precision accuracy.

2. Two 4-20mA outputs (configurable).

3. Durable and fast responding

4. Automatic balance function for the

mirror, optical circuitry.

RS232 communication

Simple maintenance-mirror cleaning

SPECIFICATIONS

OPERATING

LIMITATIONS:

Temperature: -40°C to +70°C. High temperatures will damage the electronics.

Accuracy: ± 0.5C of reading for both dew point and temperature

Repeatability: ± 0.05C

Calibration: NIST Traceable

Measurement Range: Dew Point -20C (@ 25C) to 60C (non-condensing)

Dew Point -40C (@)0C)

Temperature probe: (optional) -40C to 120C

Output: (2) 4 to 20mA output at 24Vdc (configurable). Default settings: -20C to 60C (unless

specified on purchase order.

Supply Voltage: 24Vdc +/-3V @1.0A

Weight: 2lbs

Wetted material: nickel, ultem and anodized aluminum

Pressure rating: 5 ATM. Thread size 1.25”-12 UNF

WARNING: Pressure more than allowable rating may cause the housing to

burstand cause serious personal injury.

Air Velocity: 50 to 900m/min

Optional:

Air Temperature probe dimensions: length 5”, O.D. 0.1875 (3/16”)

Air temperature connection: 4 wire (flying leads)

CMDP Instructional Guide

The CMDP is a single stage chilled mirror hygrometer configured for duct mount, wall mount and OEM application. For

Pipe Mount applications please consult factory. The CMDP requires 24VDC @1 A for power. It is has two 4-20mA

outputs factory scaled for -40C to 60C. The unit also has a RS232 communication connection that can be accessed using

either the Hyper terminal or TeraTerm program which is available on most computers.

Notes: Even though the unit is scaled from -40C to 60C, the unit can only measure to -20C dew point at ambient

temperature conditions (25C). If the dew point is lower than -20C, the user will have to cool the body of the sensor to a

lower temperature. The unit has depression capability of 45C (meaning if at ambient (25C), subtract 45 from 25C and

that will be your lowest dew point (-20C). So, lowering the temperature of the sensor will get you to lower measurable

dew points.

Wiring instructions for the CMDP series

Terminal Block

All wiring is done to the 12-pin terminal block located on the PCB

Pin 1 Tx (RS232)

Pin 2 Rx (RS232)

PCB blue connector:

Pin 3 (+) 4-20mA output

Pin 4 Ground

Pin 5 (+) 4-20mA output

Pin 6 (-) common for 4-20mA outputs

Pin 7 (-) Air temperature probe

Pin 8 (-) Air temperature probe

Pin 9 (+) Air temperature probe

Pin 10 (+) Air temperature probe

Pin 11 Return

Pin 12 24Vdc (@1A)

Protocol setup to run or program the CMDP.

No special software is needed. User can use either the TeraTerm program or the HyperTerminal program on their PC.

Connect the RS232 connection from the Dew Tran and using a USB converter connect to your PC.

Protocol configuration: Baud rate 19.2K, 8 Bits, 1 stop Bit, No parity

To access the menu, hit the “esc”

The Cap lock key must be on when selecting commands.

Calibrating Current Outputs

There are 2 methods for calibrating the 4-20 mA. outputs. Method 1 uses a digital ammeter, capable of 1 uA.

Resolution. The second method uses high precision (.005%) Resistor(s), In range of 10 – 750 ohms. The

factory Calibration is done using 100.00 ohm resistors.

for output 1, connect Ammeter across BLACK Wire and RETURN. From normal operation, enter following

keystrokes:

<ESC> <C>hange <O>utputs <C>alibrate <C>urrent.

at the “Sense Resistor Value (Y/N) OHMS?” Prompt, enter <N>

Enter<1> for Current output 1. The prompt “4 mA. = ?, enter the value displayed on Ammeter, as mA’s

Continue for the next 2 prompts (12 mA. and 20 mA.)

the prompt “4 mA. = 1XXXX” is displayed, check Ammeter for 4.00 mA. reading. Press <CR> to sequence (8,

12, 16 ,20 mA.) Values, with corresponding Ammeter Readings. If calibrated values good, at “Save Calibration

(Y/N)?, enter<Y>.

Operations

There are two ways to determine if the sensor is operating/properly functioning.

Reminder: When the unit is first powered on, the unit will take 3-5 minutes to control. Typically, the unit goes

through what we call an ARC condition. Which is a balancing cycle, the unit initial heats up, then goes into an

acquiring mode (hunting for the dew point) and then the control mode.

If you are using the RS232, output you can view the data via your computer to see if the unit is in control.

The data will be streamlined on your PCs and you will see the word “control” at the end of each line.

Another method is by viewing the red light on the PCB. If the red light is in a steady state (always on), the

unit is in control.

If the red light is blinking, the unit is most likely in one of these three states.

The unit was just powered on and is going through its ARC cycle for 3-5minutes.

The mirror is dirty (has contaminants on it) and it needs to be cleaned. Refer to the clean mirror

procedure.

If the above 2 steps do not remove the blinking red light condition, the unit could be out of range to

measure that dew point/frost point. (Ex: if your ambient condition is 25C and your dew points is

below -20C, the unit can not measure that dew point (red light will blink). A way to correct that is to

lower the body temperature of the sensor to a point where the dew point is measurable with this unit.

Clean Mirror

mirror

Power down

Gain access to the mirror

Clean mirror with a wetted (using isopropyl alcohol) cotton swab.

Dry the mirror surface with a dry cotton swab.

Reinstall sensor shield if applicable.

Power the CMDP on

Also, the mirror can be cleaned during the ARC (when red light is blinking) by following the above steps 2- 5

Control light

Airflow adjustments

There are air 6 holes in the middle of the outer shell. 2 large holes, 2 medium, and 2 small. The holes allow the airflow

to the mirror (where the measurement is made).

To adjust the airflow to the mirror, the Phillip set screw must be removed. Once removed, twist the outer shell to the

correct hole for airflow and then re-install the set screw to hold the outer shell in place.

For example: if the larger airflow hole has been selected and your signal is constantly oscillating after the red light is in a

steady state. You might want to select a smaller hole to slow down the airflow to the mirror. If that doesn’t work, try to

clean the mirror.

Set screw

Outer shell

Airflow holes

For Pipe Mount configurations;

Roscid supplies a Hex Bushing: Red Brass, 1 1/2 in x 1 in Fitting Pipe Size, Male NPT x Female NPT, Class 125.

The sensor head (black flow rate cap) should be installed at least 1” into the process gas.

If the reading is oscillating, you might need to adjust the black flow rate cap, slowing the flow rate down.

Chilled Mirror Hygrometer, a fundamental first principal measurement for dew point:

Black flow rate cap

R 22.35

50.55

174.5

B69.85

R 11.18

91.95

R. 9.14

136.4 B

147.32

44.45

PROPRIETARY AND CONFIDENTIAL

UNLESS OTHERWISE SPECIFIED:

DIMENSIONS ARE IN mm

TOLERANCES: FRACTIONAL

ANGULAR: MACH BEND

TWO PLACE DECIMAL

THREE PLACE DECIMAL

INTERPRET GEOMETRIC

TOLERANCING PER:

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:

NAME

DATE

TITLE:

CM-10-D

THE INFORMATION CONTAINED IN THIS

DRAWING IS THE SOLE PROPERTY OF

<INSERT COMPANY NAME HERE>. ANY

REPRODUCTION IN PART OR AS A WHOLE

WITHOUT THE WRITTEN PERMISSION OF

<INSERT COMPANY NAME HERE> IS

NEXT ASSY

USED

MATERIAL

FINISH

SIZE

DWG. NO. REV

PROHIBITED. APPLICATION

DO NOT SCALE DRAWING

SCALE:

1:4

WEIGHT:

SHEET 1 OF 1

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