Manualshelf

Install Instructions

ManualsBrandsDwyer ManualsHVAC SuppliesHumidity/Temperature Sensor Transmitter, 3% w/ Duct Mount, 4-20 mA
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DISPLAY
The temperature indicated on the display, if equipped with the LCD option, is eld
selectable via a jumper located on the circuit board. Position the jumper for °F or °C
according to Figure 5.
Note: The display will indicate temperature even if the unit does not have a temperature
output.
TROUBLESHOOTING
1. Verify that the unit is mounted in the correct position.
2. 4-20 mA Models:
Verify appropriate supply voltage. The transmitter requires a minimum of 10 and
a maximum of 35 VDC at its connection for proper operation. Choose a power
supply with a voltage and current rating which meets this requirement under all
operating conditions. If the power supply is unregulated, make sure voltage
remains within these limits under all power line conditions. Ripple on the supply
should not exceed 100 mV.
Rmax =
Vps - 10.0
20 mA
Rmax =
Vps - 10.0 - Vrec
20 mA
Figure 5
1
2
3
4
-
+
-
+
1
2
3
4
5
-
-
+
C
P4
F
TEMP
SENSOR
TEMP
SENSOR
RH RECEIVER
RH RECEIVER
°F/°C SELECTION JUMPER
POWER SUPPLY
POWER SUPPLY
Loop Resistance – The maximum allowable loop resistance depends on the power
supply voltage. Maximum loop voltage drop must not reduce the transmitter voltage
below the 10 VDC minimum. Maximum loop resistance can be calculated with the
following equation. Vps is the power supply voltage.
Some receivers, particularly loop powered indicators, may maintain a xed loop
voltage to power the device. This voltage drop must also be subtracted from the power
supply voltage when calculating the voltage margin for the transmitter. The following
equation takes this into account. Vrec is the receiver xed voltage.
0-5 V and 0-10 V Output Models:
Verify appropriate supply voltage. The 0-5 V and 0-10 V output models require a
DC supply of 15-35 V or an AC supply of 15-29 V for proper operation maximum.
Maximum output load is 5 mA.
FIELD SENSOR REPLACEMENT
Replacement sensors are available for OSA sintered lter models (RHP-XSXX) and
duct mount models manufactured before February 2015. Sensor covers are also
available. Please contact Dwyer technical support for additional details.