GB
GB
14
§1.2 Switch Identification
The switch is fitted with a name plate, which contains the model code. The model code comprises 4 to 7 steps which
determine the design of the switch. An X in the model code refers to a special. See your specification for details of the
special.
Enclosure
C
1 - P304L - S1N - B1 - K1 - Y - X2
The first character in the first step determines the enclosure; C, V, W, Z or M. See figure 1 - 4 & 15 for the enclosures.
Sensor
C1
-
P
304
L
- S1N - B1 - K1 - Y - X2
The first and the last character of the second step determine the sensor. See figure 5 - 12 for sensors and table one
for the function.
Process connection
C1 - P304L - S
1N
- B1 - K1 - Y - X2
The number in the third step determines the size of the thread, see table 2. The last character determines the type of
thread:
N = NPT and B = BSP (Process connections with a butt joint pipe thread, BSP and others, are marked accordingly or
have an indicator line around the process connection).
Temperature switches have another key code, see §2.3 Temperature sensor.
Electrical conduit
C
1
- P304L - S1N - B1 - K1 - Y - X2
The number in the first step determines the size and the type of the electrical conduit, see table 3.
Code Size
1
¼”F
2
½”F
Code Elec.
conduit
Code Function
4
1”F 0
wire
leads
P
Pressure
6
2”F
1, 4, 7
Pg 13,5
V
Vacuum
7
½”M
2, 5, 8
M20 x 1,5
D
Differential
8
1”M
3, 6, 9
3/4”NPTF
T Temperature
X special
X
special
Table 1
Table 2
Table 3
See our catalogue
BETA Pressure and Temperature Switches, the “user friendly generation”
for a complete
reference.
2 SENSOR
INSTALLATION
§2.1 Pressure and vacuum sensors
See figure 5 - 7.
1. The process connection (1) may be held with a wrench, but
never use a wrench on the sensor body (2) or
the enclosure !!!
2. Ensure that the process connection and the pipe to which it is to be connected are properly aligned. Proper
alignment prevents excessive pressures being exerted on the switch.
3. Check the size and type of the thread of the process connection, see also §1.2. Connect the switch to the pipe.
§2.2 Differential sensors
See figure 8 - 10.
Pay attention for the position of the two process connections (1). Process connection are marked ‘High’ and ‘Low’.
1. Ensure that the process connections are properly aligned with the pipes to which it is to be connected. Proper
alignment prevents excessive forces being exerted on the switch.
2. Check the size and type of the thread of the process connection, see also §1.2. Connect the switch to the pipe.
3. Connect the high pressure pipe to the HIGH side and the low pressure pipe to the LOW side.
