Check Sensor Resistance - Graco Therm-O-Flow 20 Instructions - Parts Manual

Check Sensor Resistance

To reduce risk of injury or damage to equipment,
conduct these electrical checks with the Main Power
Switch OFF.
The package includes up to twelve heat sensors and
controllers for each of the heated zones. To check
sensor resistance:
1. Turn Main Power Switch OFF.
2. Wait for components to cool down to ambient room
temperature 63°-77°F (17°-25°C). Check electrical
resistance for the components.
MZLP
First Heat Zone
Second Heat Zone
First RTD
Second RTD
Earth Ground
3. Replace any parts whose resistance readings do
not comply with the ranges listed in the RTD
Sensors chart below.
334129S
Pins TOF Hose
A, J
C, D
G, K
M, K
B
Table 3 RTD Sensors
MZLP MZLP Plug Component
1, 2
1
3, 4
5, 6
2
7, 8
9, 10
3
11, 12
Setup
RTD Range
(Ohms)
Ram Plate 100 +/- 2
Fluid Pump 100 +/- 2
Heated
100 +/- 2
Accessory 1
Heated
100 +/- 2
Accessory 2
Heated
100 +/- 2
Accessory 3
Heated
100 +/- 2
Accessory 4
Heated
100 +/- 2
Accessory 5
Heated
100 +/- 2
Accessory 6
Heated
100 +/- 2
Accessory 7
Heated
100 +/- 2
Accessory 8
Heated
100 +/- 2
Accessory 9
Heated
Accessory 100 +/- 2
10
Heated
Accessory 100 +/- 2
11
Heated
Accessory 100 +/- 2
12
21