SATO KEIRYOKI 7820-00 User manual

Instruction Manual
NO. 7820-00 Event Recorder
3-4, Kanda-kajicho, Chiyoda-ku, Tokyo 101-0045 Japan
URL: http://www.sksato.co.jp/english/
EK-R03001-1

1
This instrument is used connecting a tipping bucket type rainfall sensor with a cable. Numbers of electric
contacts (pulse) are recorded on a chart that wounded around a cylinder.
Main Component Parts
1. Cylinder type clock : Quartz clock driven by a battery
2. Recording pen : Cartridge pen (violet)
3. DC solenoid
4. Snail cam and ratchet mechanism
5. Damping device : Liquid type
6. Base and cover
7. Battery for clock : “C” size battery x 1 pc.
8. Batteries for counter : “D” size battery x 2 pcs
Specifications
1. Type : Electromagnet activated ratchet
2. Cylinder speed : 1-day rotation: 12.0mm per hour
7-day rotation: 43.5mm per day
3. Effective width of chart : 100mm
4. Min. graduation : 2mm
5. Movement width of pen per pulse : 1mm (a half of the scale)
6. Movement of pen : The pen moves up a half of the scale per pulse. When the pen
reaches 100 pulses, it automatically returns to zero to begin
another traverse.
7. Min. operative electric current : 60mA
8. Resistant of solenoid coil : approx. 32ohm
9. Power requirements : ①3VDC (2 “D” size batteries are built into the unit)
②External battery (3 to 12VDC)
③Allowable electric current: 400mA
10. Width of input pulse : More than 0.1sec. (ON. OFF signal by contact)
11. Contact interval : More than 0.2sec. (Interval between ON and OFF)
12. Cylinder rotation : 1-day and 7-day changed by the gears provided.
13. Operation ambient : -10 to +40ºC
14. Dimensions and Weights : 300(W) x 140(D) x 200(H) mm, approx. 3.7kgs
15. Standard accessories : One “C” size battery, two “D” size batteries,
55 sheets of 7-day chart, one cartridge pen is a factory set

2
Cautions on installation place
Do not install the unit in a place subject to vibration, shocks and inclination.
How to Use
1. Wiring (refer to the drawing (DWG) No. 941-003)
2. Replacement of chart and other preparations (refer to DWG No. 860-016 and 860-014)
(1) Pull the pen lifting bar toward you to separate the pen from cylinder.
(2) Pull the chart holder upward and remove used chart. (DWG No. 860-014)
(3) Wind the chart on to cylinder so that the lower edge of new chart is closely applied to the
bottom lip of cylinder. Overlap both ends of chart at the chart holder and attach the chart
holder to hold the chart (DWG No. 860-014)
(4) Pour water or oil containing little viscosity into the vessel of damper. This is provided to
slow the pen’s descent when the pen returns to zero. (DWG No. 860-016)
(5) To move the pen position by hand, push the suction plate of solenoid ⑤downward and
release. Ratchet wheel ⑮forwards by one tooth and the pen rises for one pulse.
(DWG No. 860-016)
(6) Confirm that the pen tip is on the zero scale of chart. If the pen tip is deviated, loosen lock
nut ⑨and make adjustments turning zero adjustment screw ⑩. (DWG No. 860-016)
(7) Remove cap of pen. (Be careful not to touch the pen tip with fingers or ink will not flow
smoothly owing to grease.)
(8) Install two C size batteries into the battery compartment on top of cylinder being careful
about the polarity of + and - . Battery life will be about one year, however in the place where
temperature is below 0℃, its performance will drop. In such an ambient, use alkali batteries
(DWG No. 860-014)
(9) Align the pen tip with the time line of chart. Turn the cylinder seen from above
counterclockwise so that the error by gear gap will be decreased.
(10)Two “D” size batteries (3VDC) are used for the counter to drive the solenoid. Install the
batteries in the battery compartment located in the cover. The solenoid generates noise
and surge absorber of 22V is inserted. (DWG No. 811-022, 941-003)
3. Change the Chart-forwarding Speed (DWG No. 860-015)
There are two shafts on the bottom of the cylinder that are A (24H) for 1-day and B (168H) for
7-day period. Install the either of 1-day or 7-day pinion onto the proper shaft to change the
recording period.
4. External supply of power (Refer to DWG No. 941-003)
When the power is supplied from the external batteries (3 to 12VDC), be sure to remove the
built-in batteries.
The min. voltage is required so that the electric current flows within 85mA to 150mA.

3
Black
Red
Event Recorder
Black
811-022
DWG.No.
DRAWN
CHECK
CHIFE
MASS
COLOR
DATE
SCALE
REG. No.
2000.12.12
4KG
5GY6/1
Two “D” batteries
Material of cover and base
: Steel plate
141±2
210±2
23
8.7
18.5
Max. extension 23
296±2

4
6. Pen lifting bar
1. Battery compartment
2. Damper
7. Cylinderclock
2. Damper
9. Lock nut
10.
Zeroadjustmentscrew
14.Springadjustmentaxis
16.Cam
Event Recorder
3. Vessel for damper
5. Suctionplate
8. Magnet coil
4. Cartridge pen
Damper arm
13.Clip set
11.Cover
12.Hinge
15.Ratchetwheel
Pourwaterlittlemorethan thepositionthatthedamper goesupupmost.
○
A-○
BCross Section
Externalbattery terminal
Transmitter_

5
Stopper
Cartridge pen
Pen arm
Cartridge pen is set on Pen arm
Battery
Lid of battery compartment
Cylinder clock
Window for confirming operation
Cylinder holding nut
Chart holder
Cylinder clock
Chart
Bottom plate
Insert tip of chart holder into this hole.
Pen lifting bar
Pen arm
Pen holding clip

6
Cylinder holding nut
Cylinder
Cylinder shaft
Base plate
Gear
Pinion
Bottom plate
Shaft for pinion
Pinion
Lift on both sides of pinion
with tips of screwdrivers
Screw driver
Screw driver
Pinion
Pinion
Shaft for Pinion
Pen lifting bar
Pen holding clip
Pen arm
Side View of Cylinder clock
Bottom of Cylinder clock
Bottom of Cylinder clock
Pen arm
Pen arm is secured with a clip
during transportation.
Remove the pen arm from the
clip and move down the clip.

7
Wiring
※Be sure to remove the built-in batteries when external batteries are used.
When the wiring resistance increases because the distance to the sensor is long, the
voltage will drop and the unit will stop the performance. In this case, increase the
voltage, but adjust the voltage so that the electric current flows within 85mA to 150mA.
E (V)
Electric current (mA) = ------------------------------- x 1000
32 () + r ()
E: Voltage of battery
R: Both-way resistance of wire
32: Coil resistance of solenoid
Event Recorder
941-003
DWG. No.
DRAWN
CHECK
CHIFE
MASS
COLOR
DATE
SCALE
2000.12.13
Solenoid
Event Recorder
22 V
Battery
(1.5V x 2)
black
black
red
External batteries
3 to 12VDC
※
Sensor
100mA
－
＋