No.7821-50
Digital Rainfall Indicator with Alarm
RA-001-00
Calibration : Not available
JCSS Accredited Calibration : Not available
This instrument displays rainfall data received from Tipping Bucket Rainfall Sensor (Cat. No. 7821-00) sold separately, and alerts at the same time.
Instruction manual
Feature
■ RA-001-00 is designed to be used with Tipping Bucket Rainfall Sensor R1-502 (Cat. No. 7821-00) which outputs the contact signal to RA-001-00.
A built-in microprocessor calculates the rainfall based on the signal, displays the data, and performs the alarm output.
An alarm threshold can be set at your will. Alarm is output through relay contact, light, and buzzer.
Analog output is available by make-to-order.
■ Hourly rainfall and accumulated rainfall (or effective rainfall) are displayed.
■ Two alarms for different values can be set, and each alarm includes relay contact, lighting of the hazard lamp, and a buzzer sound.
First alarm: contact 24VDC, 1A; slow blinking of LED in yellow; a slow intermittent buzzer
Second alarm: contact 24VDC, 1A; fast blinking of LED in red; a fast intermittent buzzer
■ Branch output as a contact pulse available in addition to data display.
24VDC, 1A, operating time > 100 ms
■ Internal battery runs 4 hours even in a blackout
Description
Ask us if you require an optional analog output.
| Channel | 1 channel |
| Output content | Hourly, accumulated, or effective rainfall * Choose either one * Output impedance less than 500Ω |
| Output range | 0 to 100 mm or 0 to 1000 mm in 0 to 1VDC * Choose either one |
Specifications
| Cat. No. | 7821-50 |
| Product name | Digital Rainfall Indicator with Alarm |
| Model name | RA-001-00 |
| Connectable devices | Tipping Bucket Rainfall Sensor (Cat. No. 7821-00, -10) |
| Input | One pulse per 0.5 mm of rainfall (1.0 mm available by make-to-order) |
| Required contact time | 0.1 second |
| Branch output | Contact 24 VDC, 1 A, contact time 0.1 sec |
| Indication | Hourly rainfall in 4 digits (upper LED) Accumulated rainfall or effective rainfall in 4 digits switched by a key (lower LED) |
| Display range | 0.0 to 999.5 mm/s |
| Alarm range | Hourly rainfall: 1 to 450 mm Accumulated rainfall: 1 to 999 mm Effective rainfall: 1 to 999 mm |
| First alarm | contact 24VDC, 1A; slow blinking of LED in yellow; slow intermittent beeping |
| Second alarm | contact 24VDC, 1A; fast blinking of LED in red; fast intermittent beeping |
| Operation ambient | 0 to 50°C, less than 90%rh without condensing |
| Max. distance from bucket sensor | 500 m if CVVS 1.25 mm2 cable is used |
| Material | Stainless steel |
| Dimensions | 200 (W) x 110 (H) x 200 (D) mm |
| Weight | 3.5 kg |
| Power | 100 or 240 VAC ±10%, 15VA Internal battery runs 4 hours in a blackout. Battery is charged whenever connected to power. |
