2-7
Installation
FAILURE MODE AND
SECURITY JUMPERS
Failure Mode Jumper
The transmitter monitors itself during normal operation with an
automatic diagnostic routine. If the diagnostic routine detects a sensor
failure or a failure in the transmitter electronics, the transmitter goes
into alarm (high or low, depending on the position of the failure mode
jumper).
The analog alarm and saturation values that the transmitter uses
depend on whether it is factory configured to standard or
NAMUR-compliant operation. The values for each are as follows:
Failure Mode Jumper Locations
Without a meter installed:
The failure mode jumper is located on the front side of the
electronics module on the electronics side of the transmitter
housing, and is labeled FAIL MODE (see Figure 2-6 on page 2-8).
With a meter installed:
The failure mode jumper is located on the LCD faceplate on the
electronics module side of the transmitter housing, and is labeled
FAIL MODE (see Figure 2-6 on page 2-8).
Transmitter Security
Jumper
The transmitter is equipped with a write-protect jumper that can be
positioned to prevent the accidental or deliberate change of
configuration data. The security jumper is located on the front side of
the electronics module and is labeled XMTR SECURITY (see Figure 2-6
on page 2-8).
Changing the Position of
the Failure Mode or
Security Jumper
To change the position of the failure mode or security jumper, follow the
steps below.
1. If the transmitter is installed, set the loop to manual.
2. Remove the housing cover on the electronics side. Do not remove
the transmitter cover in explosive atmospheres when the circuit
is alive.
3. Set the jumper(s) to the desired position. See Figure 2-6 on
4. Replace the transmitter cover. Both transmitter covers must be
fully engaged to meet explosion-proof requirements.
Standard Operation
Fail High
21.0 mA
≥
I
≥
23.0 mA
High Saturation
I
≥
20.5 mA
Low Saturation
I
≤
3.90 mA
Fail Low
I
≤
3.75 mA
NAMUR-Compliant Operation
Fail High
21.0 mA
≥
I
≥
23.0 mA
High Saturation
I
≥
20.5 mA
Low Saturation
I
≤
3.8 mA
Fail Low
I
≤
3.6 mA
See “Safety Messages” on page 2-1 for complete warning information.