57
EMR4 Inhibitors - Provisions for Sealing
The EMR4 uses a wire with a W & M seal that prohibits tampering with the weights and measures sensitive set-up
and calibration values stored in the Display Head. Once the wire seal is installed, a physical alteration to the
Display Head is required to gain access to the parameters that control the metrological parameters called C&C
(configuration and calibration). If the seal is broken, and power applied, the user may enter the C&C mode.
In the C&C mode, metrological parameters are adjusted and calibration of the meter is performed. When in the
C&C mode, the EMR4 will not perform a delivery.
Mechanical
The Display Head cover is secured with four bolts that have holes drilled through their heads. A sealing wire is
passed through the holes in the C&C bolt and at least one other bolt and secured with a W & M seal (see
Figure 44). This wire sealing method is the same method used to physically seal mechanical registers whereupon
removing the cover destroys the seal.
The extended keypad is sealed by rivets and cannot be opened without destruction of the rivets. The keypad is
affixed to the register housing by means of a fastener that is attached from the inside of the housing. Removing the
optional keypad can not be accomplished without breaking the same seal that secures the Display Head cover.
The Interconnect Box (IB) cover is secured to the IB enclosure by 4 Torx screws and a wire with a W & M seal.
The sealing holes are located in both the enclosure box and the cover (see Figure 45). Removing the cover will
destroy the seal.
Electronic
The EMR4 is protected from any adjustments of metrological parameters by means of the C&C switch located
inside the Display Head. During normal operation, there are two terminal positions that must be electrically
connected on the terminal block of the Display Head, YEL(+) and YEL (GND) (C&C SW terminals). The C&C
switch is protected and sealed by the cover of the Display Head housing. Two possible C&C hardware
configurations are used in the EMR4.
INTERNAL CORNER SWITCH
This is a normally open switch with a mounting bracket installed in the corner position of the register housing.
When the cover bolt is inserted to secure the cover, it passes through the switch assembly and closes the normally
open switch. Conversely when the bolt is removed the switch opens and C&C access is allowed. When using the
C&C switch assembly, the sealing wire must pass through the bolt used to mount the corner switch assembly.
REMOTE DISPLAY - FRONT COVER SWITCH
The switch is installed on the front panel of the Remote Display. The heads of the two hex head screws have been
drilled through for the sealing wire. To prevent unauthorized switch activation after C&C parameters are entered
and the switch is set to setup mode, the switch’s cover is replaced and sealing wire is threaded through the switch
cover and the heads of the two hex head screws and secured with a W & M seal (see Figure 46).
