Vaisala HMD82M Manual de instrucciones

Overview

This document provides instructions for adjustment of relative humidity and temperature in Vaisala

HMD82M and HMW88M humidity and temperature transmitters.

For the adjustment procedure, you will need the following:

•USB service cable (order code ASM212800)

•Computer with:

•Windows operating system

•Free USB port

•Driver for the USB service cable installed. See Taking USB Service Cable into Use

(page 2).

•Terminal application (for example PuTTy). See Connecting to HMD82M/HMW88M

(page 2).

•Medium-size crosshead screwdriver (Pozidriv) for the screws on the cover

•Small slotted screwdriver for the screw terminals

Using Service Port

The HMD82M and HMW88M transmitters have a serial interface on the component board for user

adjustment. You can connect to it through the 4-pin M8 service port connector on the transmitter.

Vaisala oers an optional USB service cable (order code ASM212800) for connecting the transmitter to

your PC.

The service port is intended for short-term use such as adjustment. For permanent installation, use the

analog output.

M212167EN-A

Technical Note Adjustment of Relative Humidity and

Temperature

HMD82M and HMW88M Transmitters

PUBLISHED BY

Vaisala Oyj

Vanha Nurmijärventie 21

FI-01670 Vantaa, Finland

Phone:+358 9 8949 1

Any reproduction, transfer, distribution or storage of information contained in this document is strictly

prohibited. All speciﬁcations — technical included — are subject to change without notice.

If you have not used the HMD82M/HMW88M USB service cable before, install ﬁrst the driver for the

cable. See Taking USB Service Cable into Use (page 2).

Taking USB Service Cable into Use

Before taking the USB service cable into use, you must install the USB driver on your PC. The following

instructions are for PCs with Windowsâoperating system.

1. Check that the USB service cable is not connected. Disconnect the cable if you have already

connected it.

2. Download the driver from http://www.ftdichip.com/Drivers/VCP.htm.

3. Execute the USB driver installation program (setup.exe), and accept the installation defaults. The

installation of the driver may take several minutes.

4. After the driver has been installed, connect the USB service cable to a USB port on your PC.

Windows will detect the new device, and use the driver automatically.

5. The installation has reserved a COM port for the USB service cable. Remember to use the correct

port in the settings of your terminal program.

To check the reserved COM port number:

a. Open Control Panel from the WindowsâStart menu. Search for "devices and printers" in

the Control Panel application.

b. Locate the USB cable 'TTL232R-3V3' in the list of devices.

c. Right-click to select Properties, then select Hardware. The COM port number is given in

brackets in the Properties dialog of the cable.

Connecting to HMD82M/HMW88M

The following steps describe how to connect to the HMD82M/HMW88M transmitter using a USB

service cable and PuTTY terminal application for Windows (available for download at

www.vaisala.com/en/search/download).

For the default serial interface settings, see Table 1 (page 3).

Connecting the USB service cable to the transmitter may distort the readings from the HUM and T

analog outputs on the module component board due to ground loop.

1. Connect the USB cable between your PC and the service port of the transmitter.

2. Start the PuTTY application.

3. Select the Serial & USB settings category, and check that the correct COM port is selected in the

Serial or USB line to connect to ﬁeld.

4. Check that the other serial settings are correct for your connection, and change if necessary.

Flow control should be set to None unless you have a reason to change it.

5. Select Open to open the connection window and start using the serial line.

If PuTTY is unable to open the serial port you selected, it will show you an error message instead.

If this happens, restart PuTTY and check the settings.

Technical Note M212167EN-A

2 (8)

6. You may need to adjust the Local echo setting in the Terminal category to see what you are

typing on the serial line. To access the conﬁguration screen while a session is running, click the

right mouse button over the session window, and select Change Settings... from the pop-up

menu.

Figure 1 PuTTY Terminal Application

Table 1 HMD82M and HMW88M Default Serial Interface Settings

Property Description / Value

Baud rate 19200

Parity None

Data bits 8

Stop bits 1

Flow control None

Technical Note M212167EN-A

3 (8)

Adjustment of Relative Humidity and

Temperature in HMD82M and HMW88M

The following procedure describes relative humidity (RH) and temperature (T) adjustment using serial

line commands. You can use the procedure to do a one-point adjustment (oset) or a two-point

adjustment (oset and gain).

Prerequisites

For best results, note the following recommendations:

• For one-point humidity adjustment, a < 50 %RH reference is recommended.

• Two-point humidity adjustment requires an additional reference, with preferably > 50 %RH value.

There should be over 30 %RH dierence between the two points.

• Two-point temperature adjustment requires a second reference point that is at least 20 °C

warmer than the ﬁrst point.

As a reference instrument, you can use, for example, Vaisala Humidity Calibrator HMK15 or the Vaisala

HUMICAPâHandheld Humidity and Temperature Meter HM70. For more information on the HMK15

and the HM70, see the respective User's Guides in www.vaisala.com.

Performing an accurate adjustment takes some time and preparation. Check the following before

starting any adjustment procedure:

•Always wait for measurement instruments to stabilize in the ambient temperature.

Temperature dierences are a major source of measurement error.

•Check that there are no heat or moisture sources near the transmitter.

•Check that the transmitter is not in direct sunlight or close to the discharge of the supply air

ducts.

•Check that there is no moisture on the probe. If the sensor has become wet, you must allow it

to dry before you can measure.

List of Serial Commands

Command Description

Adjustment Commands

L Show current user adjustment parameters

LI Set user adjustment parameters

SEND Output the measurement reading once

Other Commands

ASEL Show or set analog output parameters and scaling

All commands can be issued either in uppercase or lowercase. In the command examples, the

keyboard input by the user is in bold type.

The notation <cr> refers to the carriage return control character, which you can send in a terminal

application by pressing enter on your keyboard. Before entering commands, send a <cr> to clear the

command buer.

Technical Note M212167EN-A

4 (8)

Adjustment of Relative Humidity and Temperature

1. Prepare the HMD82M/HMW88M transmitter for a service port connection, as instructed in Using

Service Port (page 1) and Connecting to HMD82M/HMW88M (page 2).

2. With the USB service cable connected, issue the Lserial line command and write down the

current adjustment values, so that you can restore them manually if necessary.

Syntax:

L<cr>

The output values are as follows:

Output Name Description Default Value

URHO RH oset 0

URHG RH gain 1

UTO Temperature oset 0

UTG Temperature gain 1

Example:

URHO : 0.200000

URHG : 1.030000

UTO : 0.100000

UTG : 1.010000

3. Using the LI command, set RH and T oset to 0 and gain to 1 (= default values):

Syntax:

LI<cr>

Example:

URHO : 0.200000 ? 0

URHO : 0.000000

URHG : 1.030000 ? 1

URHG : 1.000000

UTO : 0.100000 ? 0

UTO : 0.000000

UTG : 1.010000 ? 1

UTG : 1.000000

4. If you are using a reference instrument, such as a humidity calibrator, insert the probe in the

reference environment and wait for 20 ... 40 minutes for the reading to stabilize.

Technical Note M212167EN-A

5 (8)

5. Use the SEND command to monitor the stabilization of the measurement reading.

Syntax:

SEND<cr>

Example:

send

RH= 40.10 % T= 22.36 'C

send

RH= 41.40 % T= 23.66 'C

send

RH= 42.70 % T= 24.96 'C

6. If you only want to perform a one-point adjustment, calculate the oset correction using the

measured values and the following formula, where "Ref" equals the reference value and "Meas"

the measured value:

 =  

 = 1

7. If you want to perform a two-point adjustment, repeat step 4 and step 5 in the second reference

environment, and calculate gain and oset using the following formulas:

 =Ref2 Ref1

Meas2 Meas1

 =1 1*

8. Using the LI command, set oset and gain, as calculated in step 6 and step 7.

Syntax:

LI<cr>

After entering the command, enter each new value one at a time. Press ENTER without giving a

value to move to the next parameter.

Example:

URHO : 0.000000 ? 0.1

URHO : 0.100000

URHG : 1.000000 ? 1.1

URHG : 1.100000

UTO : 0.000000 ? 0.2

UTO : 0.200000

UTG : 1.000000 ? 1.2

UTG : 1.200000

Technical Note M212167EN-A

6 (8)

9. Use the SEND command to output a single measurement reading. You can use the command to

monitor the stabilization of the reading and to verify the adjustment.

Syntax:

SEND<cr>

Example:

send

RH= 42.70 % T= 24.96 'C

Analog Output Settings

The ASEL command can be used to show or select the analog output measurement parameters

("quantities"), and the scaling that is used.

You must always connect the humidity measurement current loop (HUM) to power the transmitter.

Connecting the temperature measurement current loop is optional.

Syntax:

ASEL [output# quantity lo_value hi_value]<cr>

output# in the syntax refers to the HUM (output 1) and T(output 2) outputs on the module

component board.

Accepted values and ranges for quantity:

• T (-40 - 60)

• RH (0 - 100)

• Td (-40 - 60)

• Tdf (-40 - 60)

• Tw (-40 – 60)

• h (-40 – 460)

Example (show current settings):

asel

Analog output 1:

Quantity : Td

Level Lo : -40.000000

Level Hi : 60.000000

Analog output 2:

Quantity : RH

Level Lo : 0.000000

Level Hi : 100.000000

Technical Note M212167EN-A

7 (8)

Example (change output to T, low limit to -10 and high limit to +60):

asel 1 T -10 60

Analog output 1:

Quantity : T

Level Lo : -10.000000

Level Hi : 60.000000

Technical Note M212167EN-A

8 (8)

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