Met One Instruments BX-597A User manual

MODEL BX-597A

Temperature / Relative Humidity /

Barometric Pressure Sensor

Operation Manual

Document No. BX-597A-9800 Rev C

Met One Instruments, Inc

1600 NW Washington Blvd.

Grants Pass, Oregon 97526

Tel: (541) 471-7111

Fax: (541) 471-7116

BX-597A-9800 Manual Rev C

Model BX-597A Relative Humidity / Temperature / Barometric Pressure Sensor Manual.

publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or

translated into any other language in any form by any means without the express written

permission of Met One Instruments, Inc.

Technical Support

Should you require support, please consult your printed documentation to resolve your

problem. If you are still experiencing difficulty, you may contact a Technical Service

representative during normal business hours—7:30 a.m. to 4:00 p.m. Pacific Standard Time,

Monday through Friday.

Voice: (541) 471-7111

Fax: (541) 471-7116

E-Mail: [email protected]

Mail: Technical Services Department

Met One Instruments, Inc.

1600 NW Washington Boulevard

Grants Pass, OR 97526

Safety Notice

The contents of this manual have been checked against the hardware and software described

herein. Since deviations cannot be prevented entirely, we cannot guarantee full agreement.

However, the data in this manual is reviewed regularly and any necessary corrections included

in subsequent editions.

Faultless and safe operation of the product presupposes proper transportation, storage, and

installation as well as careful operation and maintenance. The seller of this equipment cannot

foresee all possible modes of operation in which the user may attempt to utilize this

instrumentation. The user assumes all liability associated with the use of this instrumentation.

The seller further disclaims any responsibility for consequential damages.

BX-597A-9800 Manual Rev C

Table of Contents

1. Introduction........................................................................................................... 1

2. Cautionary Statements ......................................................................................... 1

3. Initial Inspection.................................................................................................... 1

4. Product Overview.................................................................................................. 2

5. Installation............................................................................................................. 3

5.1. Mounting................................................................................................................ 3

5.2. Siting...................................................................................................................... 3

5.3. Wiring..................................................................................................................... 3

6. Specifications........................................................................................................ 4

7. Sensor Verification ............................................................................................... 5

8. Serial Communications ........................................................................................ 5

9. Maintenance .......................................................................................................... 7

10. Service ................................................................................................................... 7

11. Wiring Diagrams.................................................................................................... 8

12. Terminal Mode Commands ................................................................................ 10

BX-597A-9800 Manual Rev C Page | 1

1. Introduction

The Model BX-597A multi-parameter weather sensor is an “All-in-One” device that

measures ambient temperature, relative humidity, and barometric pressure. Sensor

performance complies with guidelines establish by the World Meteorological Organization

(WMO) and the US Environmental Protection Agency (EPA). The sensor is supplied with

mounting hardware and an integrated radiation shield and can be easily attached to lattice

tower legs and instruments masts up to 2 inches (IPS) in diameter.

2. Cautionary Statements

The sensor’s relative humidity output is referenced to saturated water vapor pressure

above liquid water. When the air temperature is below freezing, the sensor’s maximum

theoretical measurement range is limited.

To minimize exposure to direct sunlight, install the sensor facing to the north in the

northern hemisphere and south in the southern hemisphere. This orientation will help

shield the sensor from direct sunlight and reduce temperature measurement errors.

3. Initial Inspection

Upon receipt of the Model BX-597A, inspect the packaging and contents for damage. If

the packaging has arrived in a damaged condition file a claim with the shipping

company and contact Met One Instruments, Inc. to arrange for repair or replacement.

The model number and cable length are printed on a label at the connection end of the

cable. Check this information against the shipping documents to ensure the correct

product and cable length has been received.

BX-597A-9800 Manual Rev C Page | 2

4. Product Overview

The BX-597A ships from Met One Instruments pre-wired for digital output signals including RS-

232 and RS-485. The BX-597A also includes voltage outputs for AT/RH/BP, and an ID voltage

used by some Met One monitors and dataloggers to identify the sensor. The voltage outputs

are 0-2.5VDC default and can be changed to 0-1VDC or 0-5VDC.

The BX-597A uses a piezoresistive pressure sensor, a microprocessor-controlled relative

humidity module, and a platinum RTD temperature sensing element. The response of each

element is linear with negligible hysteresis. Each sensor element in the BX-597A is controlled

using an on-board microcontroller, which contains an analog-to-digital converter and non-

volatile memory for storage of factory-determined calibration coefficients. The microcontroller

polls the sensor module once per second. Measurements are temperature corrected, the

calibration coefficients applied, and the processed measurement sent out via serial

communication.

All wiring terminals on the BX-597A are protected from static-surge damage by transzorbs and

current-limiting resistors.

BX-597A-9800 Manual Rev C Page | 3

5. Installation

5.1. Mounting

The BX-597A is designed for outdoor use and is supplied with an integrated solar

radiation shield and U-bolts. Install the radiation shield with the U-bolts on any vertical

or horizontal pipe up to 2 inches (IPS) in diameter. To minimize exposure to direct

sunlight, install the sensor facing north in the northern hemisphere and south in the

southern hemisphere.

5.2. Siting

Install the sensor over an open, level area at least 9 m (EPA) in diameter. The surface

should be covered with short grass or a natural earth surface where grass does not

grow. Locate sensors away from objects at a distance equal to four times the height of

the objects, and at least 30 m (EPA) from large, paved areas. Protect sensors from

thermal radiation and ensure adequate ventilation.

Standard installation heights:

1.5 m (AASC)

1.25 to 2.0 m (WMO)

2.0 m (EPA)

5.3. Wiring

The BX-597A may be ordered with a 10547 analog output cable assembly, or 10548 digital

output cable assembly (sold separately) for connection (Individual wire leads) of the BX-597A to

a data logger, signal conditioner, or programmable logic controller. A detailed wiring diagram

for each cable assembly is provided in Section 10: Wiring Diagrams.

BX-597A sensor cables for specific Met One monitors (e.g. BAM-1020 N, BAM 1022, BC-1054,

etc.) are included in accessory kits sold with the monitors. Replacement sensor cables may also

be ordered separately.

BX-597A-9800 Manual Rev C Page | 4

6. Specifications

TEMPERATURE

Range: -50 °C to +70 °C (-58 °F to +158 °F)

Accuracy(1): Digital: ±0.2 °C

Analog: ±0.2 °C, +/-1 mV

Resolution: 0.01 °C

RELATIVE HUMIDITY

Range: 0 to 100 %

Accuracy(1): Digital: ±2 %

Analog: ±2 %, +/-1 mV

Resolution: 0.1 %

PRESSURE

Range: 500 to 1100 mbar (14.8 inHg to 32.5 inHg)

Accuracy(1): Digital: ±0.5 mbar

Analog: ±0.5 mbar, +/-1 mV

Resolution: 0.01 mbar

ELECTRICAL

Measurement Rate: 1 Hz

Data Storage: None

Standard Signal Output: RS-232, RS-485, 0-2.5 VDC

Optional Signal Output: 0-1 VDC, 0-5 VDC

Power Supply: 9-36 VDC, 25 mA typical @ 12 VDC

ENVIRONMENTAL

Temperature: -50 °C to +70 °C

Humidity: 0 to 100 %

PHYSICAL

Diameter: 7 in (178 mm)

Length: 8 in (203 mm)

Weight: 5 lb (2.3 kg)

(1) At 25°C

BX-597A-9800 Manual Rev C Page | 5

7. Sensor Verification

To verify correct wiring and test the basic sensor operation, blow on the sensor. The

warmth and moisture in your breath should cause the temperature and relative humidity

reading to rise. The output signals can also be checked against calibrated relative humidity,

temperature, and pressure devices. Please note that relative humidity can be expected to

vary significantly over short distances and in brief periods of time.

8. Serial Communications

Serial Data Output

The output of the BX-597A is a fixed length, comma delimited, serial data stream. The

serial output is factory set for 9600 baud, no parity, 8 data bits, with 1 stop bit (N, 8, 1).

Please see appendix E for a list of supported serial commands.

Output Format Detail

The BX-597A will support only one output format. This format will use fixed length

fields but also include commas to accommodate both standard CSV formatting and

legacy programs that expect fixed length fields.

The parameter order is shown in the table below.

Field

Parameter

Ambient Temperature

Relative Humidity

Barometric Pressure

Config. & Status

Check Sum

The BX-597A will report data typically once per second. An example output string is

shown below.

+023.6,022.1,0974.3,U0,*nnnn

Note: when displaying the pressure in in/Hg, there will be an extra leading zero

character but the fixed length of the field will not change.

BX-597A-9800 Manual Rev C Page | 6

A check sum parameter will be added to the end of the message (*nnnn). The check

sum is the addition of all the characters from the start of the message through the first

character preceding the asterisk (*). The check sum is expressed as a decimal

number. This is a 16-bit sum and should not overflow past 4 digits, given the number of

characters in the output string.

Polled Data Mode (RS232 or RS485)

The sensor can be set for polled data mode instead of continuous serial output, by

setting the serial trigger string while in terminal mode (see Section 12 for command

details).

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