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1 General Information 

1.1 Security wireless inertia detector «GRAN-RK» (hereinafter «the Detector») 

is  designed  to  detect  changing  of  the  monitored  item  position  from  it’s  its 

initial installation place and sending an alarm messages via wireless two-way 
communication within frequency range from 433,05 to 434,79 MHz by the 
«RIELTA Contact-R» protocol. 

1.2 The Detector is designed for operation as a component of a system, that 

is operated by a control panel (hereinafter «CP») supporting «RIELTA Contact-R» 
wireless two-way communication protocol.

1.3 The Detector generates no interferences to other types of detectors, as 

well as to domestic radio equipment.

1.4 The detector is powered by two power-supply batteries СR2450 type: main 

and back-up one, both inside the Detector case.

1.5 The Detector generates and transfers messages with the following 

information content: 

- «Normal» – under keeping initial position; 
- «Tilt-Alarm» – under tilt changing for 3° or more; 
- «Displacement-Alarm» – item displacement from its initial position at a distance 

0.25 m or more with the acceleration of 0.5 m/s

2

 and more along any axis during 

the period at least 1 s; 

- «Tamper» – under case tampering or the detector removal from its place 

of installation;

- «Failure» – under long-term vibration interferences; 
- «Main power-supply low-battery» – main power-supply battery voltage drop 

for less than 2.4 V; 

- «Backup power-supply low-battery» – back-up power-supply battery voltage 

drop for less than 2.4 V;

1.6 Wireless two-way communication «Detector – CP», is provided at the main 

or reserve frequencies. Switching between the main and reserve frequencies is 
accomplished automatically.

1.7 The detector provides immunity to electromagnetic interferences.
1.8 Industrial interferences created by the Detector does not exceed the 

limits for the facilities used in housing, commercial zones or production areas 
with low power consumption.

1.9 The Detector is designed for continuous and uninterrupted operation.
1.10 The Detector operational stability provides its normal operation under 

the following influencing factors:

a) Tilt changing for at least 1°,
b)  Displacement  from  its  initial  position  for  the  distance  not  more  than  0.1  m                                                                                                                               

with the acceleration of 0.2 m/s

2

 and more along any axis during the period 

at least 1 s.

1.11 The Detector provides a possibility of a tilt sensitivity adjustment (the 

sensitivity value is adjusted as one of a number of:  3°, 10°, 25°, 45°), as well as 
displacement threshold adjustment (displacement threshold is adjusted as one 
of a number of: 1 – min, 2, 3, 4, 5, 6, 7, 8 – max).

2 Specifications

Table 1

Parameter Name

Value

Power supply

2,6 V … 3,8 V DC

Operating temperature

minus 10 … +50 °С

Permissible relative humidity at +35 °С without moisture 

condensation

95 %

Dimensions, max

65х55х20 mm

Weight, max

0,05 kg

IP rating

IP54

Mean time to failure, not less

60 000 hours

Average service life

8 years

Battery life, up to

12 months 

3 Scope of Delivery 

Each Detector unit package contains the items listed in Table 1.
Table 2

Description

Quantity

Security wireless inertia detector «GRAN-RK»

1 pc.

Lithium power-supply battery СR2450 

2 pc.

Screw 3-3х30.016 

1 pc.

The Detector Installation Guide

1 copy

4 The Detector Design

The Detector layout is shown in Fig.1.

SECURITY WIRELESS INERTIA 

DETECTOR

«GRAN-RK»

Installation Guide

The Detector comprises the following elements: the base with an openable 

fixing hole (6) and a case cover with the printed circuit board (PCB) installed (1). 

Main power-supply battery holder (2), «Reset» contacts (3), backup power-

supply battery holder (4), tamper (5) are located on the PCB.

5 Led indication 

The Detector generated the following LED indication types:
-  LED indication of the mode «Binding» (procedure of the Detector logging 

in the CP);

-  LED indication of the mode «Identification» is switched ON by the relevant 

command from the CP; 

- the LED indication continues lighting during 15 minutes after the case is 

closed if other types of indication are OFF, and «Tamper» message or indication 
inhibition command from the CP are not generated.

The LED indication modes are listed in Table 3.
Table 3

The Detector Mode

LED indication

Note

Binding procedure finishing

LED lighting red for 2-3 s

«Identification»

Alternate Red and green  LED 

lighting 

«Identification» indication

Alternate LED blinking red 

and green 

by the relevant command 

from the CP

«Tilt-Alarm»* 

«Displacement-Alarm»*

LED blinking red every 4 s 

until the relevant messages 

delivery is conformed

«State» indication is 

ON, «Identification» 

indication is OFF

«Communication Quality»

See section «Communication Quality Appraising»

«Interference»* indication

LED blinking green with 

the frequency 5 Hz under 

detection of a movement with 

acceleration of 0.2 m/s and 

more

«State» indication is 

ON, «Identification» 

indication is OFF

Initial orientation storage 

procedure finishing

LED lighting green for 2-3 s

«State» indication is 

ON,  «Identification»               

indication is OFF

«Norm»

Indication is OFF 

*) – The LED indication of the Detector 

6 Binding with the CP

 

The binding procedure is intended for logging of the Detector in the CP with 

further service information exchange. 

6.1 Prepare CP for binding according to the CP Installation Guide.
6.2 After completing sect. 6.1, install the backup power-supply battery to the 

backup power-supply battery holder (4) and then the main one to the holder (2).

6.3 Alternate LED blinking green indicates that the Detector is in «Binding» 

mode.

6.4 In case of the absence of the indication mentioned above, close the 

contacts «Reset» for 2-3 s.

6.5 Successful binding procedure finish is displayed by the Led indicator 

lighting red for 2-3 s. 

6.6 The time of binding procedure fulfillment is limited to 100 s, after it the 

Detector switches to a sleeping mode. For «Binding» mode resumption it is 
necessary to close the contacts «Reset» for 2-3 s.

7 Operating Modes

The Detector provides two operating modes – Mode 1 and Mode 2.
7.1 At Mode 1 the initial orientation in the space is stored after each «Tilt-

Alarm» and «Displacement-Alarm» message generation.

7.2 At Mode 2 the initial orientation in the space is stored after closing the 

case of the Detector. 

The «Norm» mode resumption after «Tilt-Alarm» message generation is fulfilled 

only after the Detector initial position is restored.

7.3 The Detector operating mode is defined by the state of case tamper con-

tacts during initial 2 seconds after the successful  binding procedure finishing 
or during initial 2 seconds after energizing of the Detector logged in the CP. If 
the tamper contact is closed, the Detector switches to Mode 1; if the tamper 
contact is opened, the Detector switches to Mode 2. 

7.4  To finish the Detector initial position storage procedure, it is necessary to 

ensure its immobility for the time not less than 5 s. The successful finish of the 
storage procedure is displayed by generation of «Norm» message and repeated 
by the correspondent LED indication (See table 3).

8 Availability Check 

8.1 To check the Detector availability it is necessary to:
- put the base on the flat surface;
- set the cover with the PCB on the base and leave it fixed for 8-10 s.
8.2 After getting the regular «Norm» message, the Detector should be displaced 

for 25-30 cm or tilted for 3° or more. After detecting change of its initial position, 
the Detector should transmit the message «Tilt-Alarm» or «Displacement-Alarm» and 
repeat it by red LED indicator, located on the PCB (See Table 3).

9 Communication Quality Appraising  

9.1 In order to check the wireless communication availability, accomplish the 

following steps:

- set at first the back-up power-supply battery, than the main one to the holders; 
- place the Detector to the assumed place of mounting;
- push and release The Detector tamper contact.
9.2 After tamper contact release, the Detector generates «Tamper» message and 

transmits it via radio communication channel. The message is followed by the LED 
indication, displaying the radio communication quality in accordance with Table 4.

а) Base

b) Cover with the circuit board installed

1

6

2

3

4

5

BACKUP

MAIN

RESET

Figure 1

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