SOMMER MRL-7, User Manual, Page: 22 / 100

21
Figure 6: Open the MRL-7 housing
!
Attention
Before closing the data logger place a desiccant bag (approx. 5g) into the hous-
ing and make sure that the rubber seal is not broken and firmly sitting in its
groove!
When closing, tighten diagonally positioned screws step by step!
6.3 How to connect a sensor
To connect a sensor to the MRL-7 follow the steps described below:
1. Open the housing as describes in Section 6.2
2. Feed the sensor cable through the cable gland and connect it to the specified terminal (for handling
the spring clips see Section
6.3.2 )
3. After closing the data logger, carefully tighten the cable glands. When closing the data logger, pull
out any excess cable without applying too much stress on the connected wires!
6.3.1 Connection pins
The pin-layout of the MRL-7 is shown in Figure 7 and described in Table 7 .
Group Pin Description
X1
- Battery connector (-)
+ Battery connector (+), max. 14 V
X2
- Solar Supply voltage (-) or solar panel connector (-)
NC Not connected. Do not use!
dis CR Disabling internal charge regulator
+ Solar Supply voltage (+) or solar panel connector (+)
X5
+ RS485A RS-485 A
- RS485B RS-485 B
SDI12 SDI-12 sensor connector
GND Ground
X19 5V-Out 5 V output for sensor supply (max. 100 mA)
*)