LIQUID LEAK SENSOROPERATION MANUAL(Web Site Downloaded only)

For RS-2000 Series, as following models
Control Unit:
RS-2000C
Detection Unit:
RS-2000P
RS-2000F

RS-2000CA
RS-2000PP
RS-2000FP* RS-2000 series do not have such models or application to use Detection Unit as Stand-Alone.

UL Recognized: File No. E176923
CE Mark Compliance: EN61326

TOYOKO KAGAKU CO., LTD.
Components Business Division
370 Ichinotsubo, Nakahara-Ku,
Kawasaki City, Kanagawa Pref.
211-8502, JAPAN
Phone: (044)435-5860

Fax: (044)434-9091(Patent Registered)
MAN-RS2-06.2012 Revised

Introduction
We appreciate that you have chosen our Liquid Leak Sensor.
Before you install or operate it, please read this operation manual thoroughly, and follow the instructionin order to avoid any accidents, malfunction, defects and hazards.
Please keep this manual with good care as long as the sensor is being operated.

Table of Contents
1. Designation of Sensors············································································· 3
1-1 Control Unit ··························································································· 3
1-2 Detection Unit ························································································ 4
2. Installation of Detection Unit ······································································ 5
2-1 RS-2000P/ RS-2000F········································································ 5
2-2 RS-2000PP/ RS-2000FP···································································· 5
3. Wiring Instruction····················································································· 6
3-1 Control Unit RS-2000C····································································· 6
3-2 Control Unit RE-2000CA ·································································· 6
4. Operation and Function Pre-Check····························································· 7
4-1 RS-2000C ······················································································· 7
4-2 RS-2000CA····················································································· 8
5. Resetting after the Leak Detection ······························································ 9
6. Definition of the Words ············································································· 9
6-1 Failure ··························································································· 9
6-2 DIP Switch ····················································································· 9
7. Troubleshooting (Q & A) ············································································ 10
7-1 Detection Unit················································································· 10
7-2 Control Unit···················································································· 10
8. Specification···························································································· 11
8-1 Control Unit···················································································· 11
8-2 Detection Unit················································································· 11
8-3 Bracket ·························································································· 11
9. Condition of LED and Relay Contacts ························································· 12
9-1 RS-2000C ······················································································· 12
9-2 RS-2000CA····················································································· 12
10. Appearances and Dimensions
10-1 Control Unit ·················································································· 13
10-2 Detection Unit ··············································································· 13
10-3 Bracket ························································································ 13

1. Designation of Sensors
1-1. Control Unit
(1) RS-2000C (Single Input-Single Output)
LEAK INDICATOR
Red LED ON  Leakage or Failure
Green LED ON  Normal
LED Off  Power Failure

4-Screw Hole(Diameter: 4.5mm)

Power
Source

+24V

+5V

0V

SIG

Input from
Detection Unit

GND
Relay Out
Normal Open
Single, SPST

Not UsePOWER Switch
Red LED ON
 Power ON

ERROR INDICATOR
LED Off: Normal
Red LED ON  Failure

WARNING: Do not connect two or more Detection Units into this model of a Control Unit.

(2) RS-2000CA (Multiple Inputs-Multiple Outputs by 8 sets)

Power Source

+24V
0V

Relay Output for ERROR (1 set)
Closed  Normal
Open  Error

Relay Outputs for Alarm (8 sets)
Closed  Normal
Open  Alarm of Leak or Failure(*Also DIP SW OFF)

4-Screw Hole (Diameter 4.5mm)

DIP Switch(Ref Manual
Section 4.Operation)

POWER
SwitchInput For Detection Units(8 sets)

+5V
SIG

G

LEAK INDICATOR, 8 spots
Red LED ON  Leakage, Failure
Green LED ON  Normal
LED Off  Power Failure

ERROR INDICATOR, 1 spot
Red LED ON  Failure
LED Off  Normal

WARNING: Do not connect two or more Detection Units at each single Input terminal.

31-2. Detection Unit
(1) RS-2000P (Body Material: P.P.)
RS-2000F (Body Material: PFA)
Cable: 2 wires w/shield
RS-2000P: O.D. 2.8mm +/- 0.3mm
Length: 2 m
RS-2000F: O.D. 2.1mm +/- 0.2mm
Length: 2 m

Indicator LED Lamp
embedded inside the caseNormal：GREEN
Leak：RED

Body
Absorbent Paper
Bracket(2) RS-2000PP (Body Material: P.P.)
RS-2000FP (Body Material: PFA)
Cable: 2 wires w/shield
RS-2000P: O.D. 2.8mm +/- 0.3mm
Length: 2 m
RS-2000F: O.D. 2.1mm +/- 0.2mm
Length: 2 m

Indicator LED Lamp
embedded inside the caseNormal：GREEN
Leak：RED

Body

Bracket4

2. Installation of Detection Unit
NOTE: Use only in combination with RS-2000 Series Controller Unit. Do not use with not specified
equipment.

2-1. RS-2000P / RS-2000F(1) Place the Bracket of the Detection Unit on the surface where you want to detect
the leakage, and fix it firmly.
(2) Place a piece of the Absorbent Paper on the Bracket.
NOTE: Be aware not to use 2 or more pieces of paper at a time in the Bracket.

(3)To mount the body, push it into the Bracket completely.

Sensor Body

Absorbent Paper
BracketNOTE: Verify that the Body has fixed entirely and it does not hook up at intermediate height in the Bracket,
making space between the bottom.

2-2. RS-2000PP / RS-2000FP(1) Place the Bracket of the Detection Unit on the surface where you want to detect
the leakage, and fix it firmly.
(2) To mount the Body, push into the Bracket completely.

Sensor Body

BracketNOTE: Do not use any Absorbent Paper for the paperless sensors as described in section 2-2.
NOTE: Only use attached Bracket, P/N-6416. Other models of Brackets cannot be used with thesensors above.

5

3. Wiring Instruction
3-1. RS-2000C(1) The Detection Unit has a 2-core shielded cable, 2 m long. When the cable needs
extended, do not exceed a maximum length of 30m.
(2) Connect a red lead to the Control Unit’s terminal, +5V , a white lead to SIG and ashield lead to G respectively.
(3) Connect the power source, 24VDC, to the Control Unit’s terminals +24V and 0V .
(4) Connect alarm input to the terminal of relay out.
Red
White
Shield

+24V
0V

+5V
SIG
G

Relay OutNo use＜RS-2000C＞
Detection Unit

3-2. RS-2000CA(1) The Detection Unit has a 2-core shielded cable, 2 m long. When the cable needs to beextended to reach at Control Unit, please take care not exceeding a maximum length of
30m as distance. (EMC compliance)(2) Connect a red lead to the Control Unit’s terminal +5V , a white lead to SIG and ashield lead to G respectively.
(3) Connect the power source, 24VDC, to the Control Unit’s terminals +24V and 0V .
(4) Connect an alarm input to the terminal of relay out for “leakage”.
(5) Connect an alarm input to the terminal of relay out for “failure.”+24V
0V

Power Source

Relay Out
#1 to #8

R

Relay Out for Failure

LEAK INDICATOR ﾗﾝﾌﾟ(1～8 個)＜RS-2000CA＞

W S

Detection Unit
#1

R

W S

Detection Unit
#8

WARNING: Do not attempt to connect two or more detection units in each single pole of terminals. If
two or more detection units are connected, control unit cannot detect leakage.
NOTE: The capacity of relay out is limited not exceeding 24VDC. Do not use in 100VAC circuit.
Note: Do not supply the power before all the wiring has been completed. After wiring has completed,keep a protection cover on the terminals of control unit during operation for safe.

64. Operation and Function Pre-CheckWARNING: The following procedure must be implemented after wiring has done and prior to actual
operation in the application.

4-1. RS-2000C(1) Verify an Absorbent Paper is located at the Bracket properly (Follow the proceduredescribing in Section 2. Installation of Detection Unit.). The Absorbent Paper Set isincluded within the sensor packaging bag for shipping from the factory.
*For RS-2000PP / RS-2000 FP, these models do not use the Absorbent Paper as
designed.
(2) Turn on “POWER” switch and make sure the Indicator LED Lamp becomes lit in red.
(3) In this condition, the sensor should operate properly.
appearances;a. “Leak Indicator” on Control Unit: is Greenb. “Error Indicator” on Control Unit: is Off

Make sure the following

NOTE: In case that “Error Indicator” lit red, wiring between Control Unit and Detection Unit may havesome failure. Make sure each connection again.

c. LED on Detection Unit: is Greend. Relay out: is Closed (Confirm using system connected.)
NOTE: System indicates that relay out is “open” status even though no failure found in appearance a.
through c. shown above, wiring between relay out and system may be problem. Reconfirm
each connection.

(4) Remove an Absorbent Paper from the Bracket and place Detection Unit on bracket.
*RS-2000PP / RS-2000FP, drip a drop of a fluid, such as water, at the bottom of unit.
(5) In this manner, the sensor works as if detecting a leak failure. Make sure the following
appearances;a. “Leak Indicator” on Control Unit: becomes Red
b. “Error Indicator” on Control Unit: becomes Off
c. LED on Detection Unit becomes Red
d. Relay out: Open (Confirm using system connected.)
NOTE: System indicates that relay out is “closed” even though no failure found in a. through c., wiring
between relay out and system may short. Reconfirm each connection.

(6) Place an Absorbent Paper back in its proper place. For RS-2000PP / RS-2000FP,
wipe off remaining water around the Detection Unit clearly. The procedure iscompleted.

74-2. RS-2000CA(1) After installation and wiring is completed, set the DIP Switch as follows.
a. Respond to the terminal number that Detection Unit is connected: ON
b. Respond to the terminal number that Detection Unit is not connected: OFFWARNING: Control Unit will indicate error if Detection Unit is not connected even though Dip Switch is“ON”. Control Unit cannot detect any leakage or failure if Dip Switch is “OFF”.

(2) Place an Absorbent Paper and Detection Unit properly (Follow the procedure describing in"2. Installation of Detection Unit".).
For RS-2000 PP / RS-2000FP, do not use the Absorbent Paper.
(3) Turn on “POWER” switch and make sure the indicator LED of the POWER switch is lit red.
(4) In this stage, the sensor should work properly. Make sure the following appearances:a. “Leak Indicator” on the Control Unit is Greenb. “Error Indicator” on the Control Unit: is Off
NOTE: In case that “Error Indicator” lit red, wiring between Control Unit and Detection Unit may be
broken or Dip Switch is not set properly. Make sure each connection or setting again.

c. LED on Detection Unit: Greend. Relay out for Leakage: Close (Confirm using system connected.)e. Relay out for Error: Close (Confirm using system connected.)
NOTE: System indicates that relay out is “open” even though no failure found in a. through c., wiring
between relay out and system may be broken or Dip Switch is not set properly. Reconfirm
connection or setting.

(5) Remove an Absorbent Paper from Detection Unit, and place Detection Unit on the
Bracket.
(6) In case of using RS-2000PP / RS-2000FP, the water may be pored at the bottom of
Bracket for the sensor works detecting leakage. Make sure the following Appearances;a. “Leak Indicator” on the Control Unit: is Red
b. “Error Indicator” on the Control Unit: is Off
c. LED on the Detection Unit: is Red
d. Relay out: is Open (Confirm using system connected.)
NOTE: System indicates that relay out is “closed” even though no failure found in a. through c., wiring
between relay out and system may short. Reconfirm connection.

(7) Place an Absorbent Paper in its place. Or wipe at the bottom of Detection Unit clearly for
RS-2000PP / RS-2000FP. Then the procedure is completed.
NOTE: The periodical check is recommended at least annually.
NOTE: The liquid detecting device in the Detection Unit is photoelectric sensitive device. When the
Detection Unit receives a strong light from outside of the sensor Body (larger than 1,000lxs), it
may cause malfunction of detecting the leak liquid at the sensor from time to time. We
recommend you to confirm that no such a strong light emitting instrument may not be located atclose position to Detection Unit, or to place a screen avoiding the light may reach to the
Detection Unit. The normal room lighting instrument may not effect the Detection Unit.

8

5. Resetting after the Leak Detection
WARNING: The liquid may contain hazardous acids, alkalis, or chemical substances. The following
procedure has to be done by a well-trained person who is knowledgeable for that liquid.
NOTE: The protection gloves must be worn.
NOTE: In case of handling any chemicals that are obliged to wear the protection goggles, masks, etc.
by regulation, must follow the regulation.

(1) Turn off the POWER switch of the Control Unit RS-2000C / RS-2000CA.
(2) Take out the Detection Unit from the Bracket, and wipe the Unit to clean and dry.

5-1. Detection Unit: RS-2000P / RS-2000F
a. Remove wetted Absorbent Paper and wipe a Bracket and surrounding to clean and dry.
b. Install new Absorbent Paper and place Detection Unit properly.
c. For RS-2000C using, follow the instruction at the Section 4-1 (2) through (6). Otherwise
using RS-2000CA, follow 4-2 (3) through (7).
5-2. Detection Unit: RS-2000PP / RS-2000FP
a. Wipe off the remaining liquid around the Bracket, and install Detection Unit properly.
NOTE: Do not use an Absorbent Paper for these group of models..

b. For RS-2000C using, follow the instruction at the Section 4-1 (2) through (6). Otherwise
using RS-2000CA, follow 4-2 (3) through (7).
(3) Verify the Detection Unit and the Bracket are set properly, then turn the POWER switch on.
NOTE: The periodical check is recommended as following your factory protocol for safety standard or
regulations of maintenance plan, but more than at least annually.
WARNING: The RS-2000 Sensor is not designed for explosion proof. Do not use the Sensor in thehazardous area. For this category of UL Standard, UL does not allow using in hazardous
area, and UL does not evaluate for use in explosive circumstances under the present UL
Category and File number.

6. Definition of the Words
6-1. Failure
In this manual, the word of “Failure” means the condition as follows when the red “Error
indicator” becomes on:a. Improper wiring of Detection Unit
b. Broken wiring of Detection Unitc. Short circuit on Detection Unit
“Error Indicator” will not become red in the case as follows:a. Power outage of Control Unit
b. Broken wiring on power linec. Broken both wiring of relay out
d. Decline of the IR LED inside the Detection Unit
6.2. DIP Switch
RS-2000C has a feature that can detect both of ‘break’ or ‘short’ of wiring between Control
Unit and Detection Unit. If Detection Unit is not connected, Control Unit will function that it
is failure to output the alarm.
RS-2000CA has a DIP Switch to control such alarms. If Detection Unit is not connected
at a certain number(s) of the input terminal of RS-2000CA, the corresponding number ofswitch(s) of DIP Switch should be turned ‘off’ position to avoid outputting the alarm from9

the Control Unit to your Factory system.

7. Troubleshooting (Q & A)
7-1. Detecting Unit
Q: “LED” does not turn on. (In any color)
A: Make sure any indicator on Control Unit turned on red.
If any of them turned red, there is some problem of broken down, short circuit or improper
wiring may be generated between Detecting Unit and Control Unit. Reconfirm thosewiring conditions.
If any of them does not turned red, DIP Switch on RS-2000CA is not set properly andexisting problem on wiring. Reconfirm wiring.
Q: “LED” keeps turned red always.
A: There may be lack of Absorbent Paper in the Bracket, or improper installation of the
Detection Unit in the Bracket. Please check around the Detection Unit and Bracket.

7-2. Control Unit
Q: “Leak Indicator” does not turn green after power switch is on.
A: DIP Switch should be set “OFF” or there is power failure.
Q: “Leak Indicator” keeps red after power is on.
A: If this occurs in the condition with no red on “Error Indicator” and no leak event, there is
no Absorbent Paper in the Bracket, or improper installation.
Q: Both “Leak Indicator” and “Error Indicator” keeps red after power is on.
A: There may be broken down, short circuit or improper wiring between Control andDetecting Unit. Furthermore, if two or more Detecting Unit are connected in each single
terminal or Detecting Unit of non RS-2000 Series is connected, the same problem will
occur.
Q: Output Relay keeps ‘open’ status.
A: Make sure the power is on. Relay keeps open without power in this Unit. Or there
may be broken wiring in the relay circuit.
Q: Relay keeps close.
A: There is short circuit.

108. Specification
8-1. Control Unit
Models

RS-2000C

RS-2000CA

Input Voltage

24V DC±10%Power Consumption
Indicator
Lamp

100mA below

200mA below

LED for Leakage

Red: Leakage, Failure Green: Normal Off: Power Outage

LED for Failure

Red: Failure Off: Normal

Discriminative Detection

Yes

Ambient Temp.

-10～60℃ (14～140°F)

Number of Input Detection Unit

1

1 to 8Connectable Detection Unit

1for each pole
Number of set
Relay Output

9(8 for Leakage 1 for Failure)

1

Capacity / set

24V DC, 1A (resistance load)

Type of Contact

Normally Closed

Case Material

ABS Polymer

Weight100g

330g

8-2. Detection Unit
Models

RS-2000F

RS-2000P

Supply Voltage

RS-2000FP

5V DC±5%Power Consumption

20mA below

Indication of LED

Red: Leakage Green: Normal Off: Failure

Connection with Control Unit

Required-10～60℃ (14～140 ﾟ F)

Ambient Temp.

Material

RS-2000PP

Case

PP

PFA

PP

PFA

Cable

HT-PVCFEP

HT-PVC

FEP

Lamp
Water Protect

Epoxy

Epoxy

(embedded)(embedded)

Sealed,Sealed,Silicon Stuffed

Silicon Stuffed

WeightAbsorbent Paper

55g

55g

Required

Not Required*Out diameter of each cable is shown below, but the value contains tolerance by manufacturing process.

HT-PVC Cable diameter: 2.8mm +/- 0.3mm, //0.1mm

FEP Cable diameter: 2.2mm +/-8-3. Bracket
ModelsSensors
Material
Installation

P/N-6417

P/N-6418

P/N-6419

RS-2000D, RS-2000P, RS-2000F
SUS301 +Ni Plated

P/N-6420B

RS-2000DP, RS-2000PP, RS-2000FP
PVC

SUS301 +Ni Plated

PVC

For M4 Screw

For M3 Screw HoleFor M4 Screw HolePVC

For M3 Screw Holes

P/N-6416

11

9. Condition of LED & Relay Contacts
9-1. RS-2000C

Normal Condition
Leak Condition
Improper Wiring of Detection Unit
Broken Wiring on Power Line
Broken Wiring of Relay Out
Broken Wiring of Detection Unit
+5V
SIG
GND
Broken+5V
SIG
Wiring
SIG
GND
+5V
GND
+5V
SIG
GND
Short Circuit on Detection Unit
+5V
SIG
SIG
GND
Short
Circuit
+5V
GND
+5V
SIG
GND
Power Outage of Control Unit
Power Outage of Detection Unit
Decline of the IR LED

LED on Control Unit
for Leakfor Failure
Green
Off
Red
Off
Red
Red
Off
Off
Green
Off

LED onDetection Unit
Green
Red
Depending on situation

Off
Green

Relay Outfor Leak● Close○ Open○ Open○ OpenSee NOTE below.

Off
Green
Off
Off
Off
Off
Off

Red
Red
Red
Red
Red
Red
Red

Red
Red
Red
Red
Red
Red
Red

○ Open○ Open○ Open○ Open○ Open○ Open○ Open

Green
Green
Off
Off
Off
Off
Red

Red
Red
Red
Red
Off
Red
Red

Red
Red
Red
Red
Off
Red
Off

○ Open○ Open○ Open○ Open○ Open○ Open○ Open9-2. RS-2000CA

Normal Condition
Leak Condition
Dip switch Off
Improper Wiring of Detection Unit
Broken Wiring on Power Line
Broken Wiring of Relay Out
Broken Wiring of Detection Unit
+5V
SIG
GND
Broken+5V
SIG
Wiring
SIG
GND
+5V
GND
+5V
SIG
GND
Short Circuit on Detection Unit
+5V
SIG
SIG
GND
Short
Circuit
+5V
GND
+5V
SIG
GND
Power Outage of Control Unit
Power Outage of Detection Unit
Decline of the IR LED

LED onDetection Unit
Green
Red
N/C
Depending on situation

Off
Green

LED on Control Unit
for Leakage
for Failure
Green
Off
Red
Off
Off
Off
Red
Red
Off
Off
Green
Off

Relay Outfor Leakage
For Failure● Close● Close○ Open● Close○ Open● Close○ Open○ Open○ Open○ OpenSee NOTE below.

Off
Green
Off
Off
Off
Off
Off

Red
Red
Red
Red
Red
Red
Red

Red
Red
Red
Red
Red
Red
Red

○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open

Green
Green
Off
Off
Off
Off
Red

Red
Red
Red
Red
Off
Red
Red

Red
Red
Red
Red
Off
Red
Off

○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open○ Open● CloseNOTE: When the wiring for relay out gets broken, it will be noticed by cutoff of the loop for the relay out, though relay does notwork. However, when there is short circuit on the wiring for relay out, it is impossible to be noticed by this sensor system.

1210. Appearances and Dimensions:Control Unit:
RS-2000C

RS-2000CA

Detection Unit:
RS-2000P/ RS-2000F/ RS-2000PP/ RS-2000FP

Bracket:P/N-6417

P/N-6416

P/N-6418

P/N-6419

P/N-6420B

13