Qualitrol 111-300 Series, Instruction Manual, Page: 8 / 24

E l e c t r o n i c T e m p e r a t u r e M o n i t o r
6
IIII
NSTALLATION AND
NSTALLATION AND NSTALLATION AND
NSTALLATION AND
W W W W
IRING
IRING IRING
IRING
Mounting of the Temperature Monitor Mounting of the Temperature Monitor Mounting of the Temperature Monitor Mounting of the Temperature Monitor
The 111-300 mounts on any flat surface outside of the control cabinet and is
secured by four (4) fasteners thru the mounting holes provided. See Figure 2 for
enclosure details.
Figure 2. Enclosure Dimensions
Each 111L/111W unit is mounted in a standard square ¼ DIN (3.622”[92mm])
cutout in the swing-out panel of the enclosure and is secured from the rear of the
unit by a push on panel clamp.
Primary Power
Primary Power Primary Power
Primary Power
Primary power is connected to TB1-19 and TB1-21 with an earth ground
connection to TB1-20. Note that because of the wide range of possible input
voltages, the user must provide fuse or circuit breaker protection for the
appropriate primary power input, external to the unit. The unit requires
approximately 2 watts of power. See Figure 3, wiring diagram for terminal
locations.
Sens Sens Sens Sensors ors ors ors
The 111L and 111W uses a 100 ohm Platinum RTD (Pt100) mounted in a
universal sensor capable of mounting in any existing Qualitrol thermal well. A
three wire RTD is recommended, a two wire RTD may be used if the lead length
is short. Lead resistance error for a two wire RTD is 1°C per 0.4 ohm of lead
resistance. A 3 wire RTD has 2 wires connected to one end of the RTD and 1
wire connected to the other end. Connect the 2 wires to TB1-34 and TB1-35. The
single wire is connected to TB1-36. When a 2 wire RTD is used, jumper the