Setra System Model 567 User Manual
Page 6
ADJUSTMENT OF ZERO AND SPAN CONTROLS
Switch and potentiometers provide continuous adjustment over the range 120% to 17% of nominal
pressure range.
Zero and Span controls are precisely set during manufacture and should only need adjustment if there is
a change in the required pressure measurement.
Access to these controls is provided by means of a removable end plate. Remove the 3 retaining screws
using 2.5mm A/F hex wrench and withdraw end plate.
Caution: Care should be taken in withdrawing end plate so as not to disconnect internal plug.
To maintain sealing integrity ensure end cap ‘O’ ring is correctly seated and clean prior to re-fitting.
RANGE SWITCH DETAILS
Switch Position
(Current Mode)
Downranging
Scope
(Nominal)
Switch Position
(Current Mode)
Downranging Scope
(Nominal)
0
120 to 74%
A
33 to 18%
1
94 to 57%
B
31 to 17%
2
76 to 46%
C
Not Used
3
65 to 39%
D
Not Used
4
56 to 33%
E
Not Used
5
50 to 29%
F
Not Used
6
45 to 26%
7
41 to 23%
8
39 to 22%
9
36 to 20%
LOAD RESISTANCE
The total permissible resistive load in the loop (to include all the cable resistance, and in the I.S. versions
the internal resistance of the Galvanic Isolator) can be from 'zero to 50 x (supply volts -8.5) ohms' e.g.
with a 24V d.c. supply the permissible load is from zero up to 775 ohms (Figure 1).