sensoR InsTallaTIon anD PlaCeMen
T
sens 000 001
sens 001 001
bRass IMMeRsIon Well - 1/2”nPT
sensoR InsTallaTIon
tHErMIStOr SENSOrS
GrUNDFOS SENSOrS
5
S O L A R H O T W A T E R
2.3. Sensors
2.3.0. types
The Delta-T Pro can read two types of sensors: 10k
Ω
Thermistors and grundfos VFS (Vortex Flow Sensor) and RPS
(Relative Pressure Sensor) sensors.
2.3.2. Grundfos Sensors
Heliodyne recommends grundfos VFS sensors for flow
measurement. Because of the vortex principle, they are
less expensive, last longer, and more accurate than pulse
/ paddle-wheel sensors. They also combine a temperature
measurement. Model selection is based on design flow rate;
we have 4 flow sizes and 1 pressure size:
•
FLOS 010 000 [to 10.5 gPM]
•
FLOS 026 000 [to 26 gPM]
•
FLOS 053 000 [to 53 gPM]
•
FLOS 106 000 [to 106 gPM]
•
PRSS 150 000 [to 150 psi]
2.2.5. relay Specification Summary table
ITEM
RELAY 1
RELAY 2
RELAY 3
Contact Voltage (Wetted)
115 or 230
115 or 230
115 or 230
Contact Type
N.O. & N.C.
N.O.
N.O.
Ratings
20A, 240VAC [N.O.]
10A, 240VAC [N.C.]
30A, 240VAC
30A, 240VAC
FIg. 2.3.2
TYPICal CloseD looP solaR sYsTeM
vfs
RPs
T
T
P
M
T1
T1
T2
T3
T4
T5
T6
T7
T7
T2
T3
T4
T5
2.3.1. thermistor Sensors
We have two mounting styles of thermistors available, each
suitable for different system placement:
•
SENS 000 001: The flattened copper lug can be attached to the
sensor stud on a solar storage tank, or can be strapped to the
outside of the system fluid tubing.
•
SENS 001 001: The sensor works in conjunction with the
immersion well, and can be placed in the fluid stream for
greater accuracy.
The sensor leads are 24AWg Class II and carry 4VDC. Use
18-24AWg zip or bell wire to run from the sensor location to the
controller. Use caution when installing to avoid wire damage.
Shielded wire is not necessary. Use insulation and weatherproofing
for accurate sensor readings. Install out of direct sunlight.
RPs
vfs
T6
