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Collection: By Manufacturer: Greystone Energy

Greystone Energy Systems, a Bemsiq Group company with 40+ years of experience, is a leading manufacturer of HVAC sensors. Following its 2021 acquisition, it expanded in 2024 by adding QEL and Armstrong Monitoring to strengthen its gas detection portfolio for building automation. Shop all of the items that we offer from Greystone here. We will be adding more to our catalog in 2026!

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2% (63 products)
3% (63 products)
5% (65 products)
2% accuracy (66 products)
2% Accuracy (52 products)
3% accuracy (66 products)
3% Accuracy (52 products)
5% accuracy (66 products)
5% Accuracy (52 products)
4-20mA (105 products)
4-20 mA (76 products)
75 mA (74 products)
0-5 Vdc (95 products)
0-10 Vdc (107 products)
24 Vdc (74 products)
'+/-3% (74 products)
0-20K PPM CO2 ranges (64 products)
3-wire (86 products)
ABS White (74 products)
AC/DC operation (198 products)
add-on outputs (60 products)
BACnet (204 products)
CDD3 (60 products)
CDD3A100 (60 products)
CDD3B100 (60 products)
CDD4B1 Series (64 products)
CO2 Transmitter (60 products)
Combo Sensors (310 products)
Digital Input (128 products)
Duct Temperature (65 products)
external comm jack (52 products)
field adjustable (64 products)
Greystone (1368 products)
Greystone CD2R (74 products)
Greystone Energy (594 products)
Greystone Sensor (128 products)
HRC2 (246 products)
HRC3 (246 products)
HRC5 (246 products)
HRC series (246 products)
Humidity (152 products)
Humidity 0-100% (52 products)
Humidity Controls (535 products)
IAQ Sensors (246 products)
LCD (120 products)
LCD display (326 products)
low profile (112 products)
menu driven set-up (64 products)
Microprocessor based (80 products)
microprocessor temperature compensation (198 products)
Modbus (200 products)
NDIR (74 products)
Network Sensor (128 products)
NTRC Series (128 products)
occupancy override (52 products)
optional override switch (80 products)
optional temp sensor output (64 products)
optional temperature sensor (231 products)
passive sensor (130 products)
precision thermistor (90 products)
Relative Humidity (60 products)
relay outputs (60 products)
Replaces CDD4 Series (74 products)
resistive temperature sensor (246 products)
RH100S (198 products)
RH and Temp (82 products)
Room (60 products)
Room Carbon Dioxide Sensor (74 products)
Room Humidity (417 products)
Room Humidity Transmitter (82 products)
Room RH (66 products)
Room Temperature (221 products)
Room Temperature Sensor (80 products)
RTD sensing element (90 products)
self-calibration algorithm (64 products)
setpoint adjustment (60 products)
slide-pot setpoint (246 products)
SPC01 (52 products)
SPC02 (52 products)
SPC04 (52 products)
SPC05 (52 products)
SPC06 (52 products)
SPC Series (52 products)
Stainless Steel (198 products)
Temperature (212 products)
Temperature Sensors (336 products)
Transmitter (218 products)
TSPC Series (80 products)
Type 2 (74 products)
Type 5 (86 products)
Type 6 (86 products)
Type 7 (86 products)
Type 8 (86 products)
Type 12 (92 products)
Type 13 (74 products)
Type 14 (74 products)
Type 20 (74 products)
Type 24 (74 products)
wall mount (60 products)
wall plate (198 products)

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2% (63 products)
3% (63 products)
5% (65 products)
2% accuracy (66 products)
2% Accuracy (52 products)
3% accuracy (66 products)
3% Accuracy (52 products)
5% accuracy (66 products)
5% Accuracy (52 products)
4-20mA (105 products)
4-20 mA (76 products)
75 mA (74 products)
0-5 Vdc (95 products)
0-10 Vdc (107 products)
24 Vdc (74 products)
'+/-3% (74 products)
0-20K PPM CO2 ranges (64 products)
3-wire (86 products)
ABS White (74 products)
AC/DC operation (198 products)
add-on outputs (60 products)
BACnet (204 products)
CDD3 (60 products)
CDD3A100 (60 products)
CDD3B100 (60 products)
CDD4B1 Series (64 products)
CO2 Transmitter (60 products)
Combo Sensors (310 products)
Digital Input (128 products)
Duct Temperature (65 products)
external comm jack (52 products)
field adjustable (64 products)
Greystone (1368 products)
Greystone CD2R (74 products)
Greystone Energy (594 products)
Greystone Sensor (128 products)
HRC2 (246 products)
HRC3 (246 products)
HRC5 (246 products)
HRC series (246 products)
Humidity (152 products)
Humidity 0-100% (52 products)
Humidity Controls (535 products)
IAQ Sensors (246 products)
LCD (120 products)
LCD display (326 products)
low profile (112 products)
menu driven set-up (64 products)
Microprocessor based (80 products)
microprocessor temperature compensation (198 products)
Modbus (200 products)
NDIR (74 products)
Network Sensor (128 products)
NTRC Series (128 products)
occupancy override (52 products)
optional override switch (80 products)
optional temp sensor output (64 products)
optional temperature sensor (231 products)
passive sensor (130 products)
precision thermistor (90 products)
Relative Humidity (60 products)
relay outputs (60 products)
Replaces CDD4 Series (74 products)
resistive temperature sensor (246 products)
RH100S (198 products)
RH and Temp (82 products)
Room (60 products)
Room Carbon Dioxide Sensor (74 products)
Room Humidity (417 products)
Room Humidity Transmitter (82 products)
Room RH (66 products)
Room Temperature (221 products)
Room Temperature Sensor (80 products)
RTD sensing element (90 products)
self-calibration algorithm (64 products)
setpoint adjustment (60 products)
slide-pot setpoint (246 products)
SPC01 (52 products)
SPC02 (52 products)
SPC04 (52 products)
SPC05 (52 products)
SPC06 (52 products)
SPC Series (52 products)
Stainless Steel (198 products)
Temperature (212 products)
Temperature Sensors (336 products)
Transmitter (218 products)
TSPC Series (80 products)
Type 2 (74 products)
Type 5 (86 products)
Type 6 (86 products)
Type 7 (86 products)
Type 8 (86 products)
Type 12 (92 products)
Type 13 (74 products)
Type 14 (74 products)
Type 20 (74 products)
Type 24 (74 products)
wall mount (60 products)
wall plate (198 products)

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1368 products

Greystone CS-425-HC-10 AC Current Switch, Solid core 120 Vac 2.5 amp switch, Triac, 10 minute off time delay

Greystone CS-425-HC-10 AC Current Switch, Solid core 120 Vac 2.5 amp switch, Triac, 10 minute off time delay

Regular price $65.66 USD

Regular price Sale price $65.66 USD
Greystone CS-425-HC-0 AC Current Switch, Solid core 120 Vac 2.5 amp switch, Triac, no time delay

Greystone CS-425-HC-0 AC Current Switch, Solid core 120 Vac 2.5 amp switch, Triac, no time delay

Regular price $65.66 USD

Regular price Sale price $65.66 USD
Greystone CS-610-75 AC Current Switch, Mini solid core 30 Vac/dc switch, MOSFET, +D:D0.75 - 75 amps, status LED

Greystone CS-610-75 AC Current Switch, Mini solid core 30 Vac/dc switch, MOSFET, +D:D0.75 - 75 amps, status LED

Regular price $57.85 USD

Regular price Sale price $57.85 USD
Greystone CS-652-R2 AC Current Sensor, Solid core sensor, 4 - 20 mA, (Average) 0 - 50 / 100 / 150 amp ranges, selectable

Greystone CS-652-R2 AC Current Sensor, Solid core sensor, 4 - 20 mA, (Average) 0 - 50 / 100 / 150 amp ranges, selectable

Regular price $62.20 USD

Regular price Sale price $62.20 USD
Greystone CS-652-R1 AC Current Sensor, Solid core sensor, 4 - 20 mA, (Average) 0 - 10 / 20 / 50 amp ranges, selectable

Greystone CS-652-R1 AC Current Sensor, Solid core sensor, 4 - 20 mA, (Average) 0 - 10 / 20 / 50 amp ranges, selectable

Regular price $62.20 USD

Regular price Sale price $62.20 USD
Greystone CS-652-50 AC Current Sensor, Mini solid core sensor, 4 - 20 mA, 0 - 50 amp range, averaging

Greystone CS-652-50 AC Current Sensor, Mini solid core sensor, 4 - 20 mA, 0 - 50 amp range, averaging

Regular price $49.38 USD

Regular price Sale price $49.38 USD
Greystone CS-652-200 AC Current Sensor, Solid core sensor, 4 - 20 mA, (Average) 0 - 200 amp range

Greystone CS-652-200 AC Current Sensor, Solid core sensor, 4 - 20 mA, (Average) 0 - 200 amp range

Regular price $62.20 USD

Regular price Sale price $62.20 USD
Greystone CS-652-20 AC Current Sensor, Mini solid core sensor, 4 - 20 mA, 0 - 20 amp range, averaging

Greystone CS-652-20 AC Current Sensor, Mini solid core sensor, 4 - 20 mA, 0 - 20 amp range, averaging

Regular price $49.38 USD

Regular price Sale price $49.38 USD
Greystone CS-652-10 AC Current Sensor, Mini solid core sensor, 4 - 20 mA, 0 - 10 amp range, averaging

Greystone CS-652-10 AC Current Sensor, Mini solid core sensor, 4 - 20 mA, 0 - 10 amp range, averaging

Regular price $49.38 USD

Regular price Sale price $49.38 USD
Greystone CS-651-R1 AC Current Sensor, Solid core sensor, 0 - 10 Vdc, 0 - 10 / 20 / 50 amp ranges, selectable

Greystone CS-651-R1 AC Current Sensor, Solid core sensor, 0 - 10 Vdc, 0 - 10 / 20 / 50 amp ranges, selectable

Regular price $44.44 USD

Regular price Sale price $44.44 USD
Greystone CS-651-50 AC Current Sensor, Mini solid core sensor, 0 - 10 Vdc, 0 - 50 amp range

Greystone CS-651-50 AC Current Sensor, Mini solid core sensor, 0 - 10 Vdc, 0 - 50 amp range

Regular price $50.63 USD

Regular price Sale price $50.63 USD
Greystone CS-651-200 AC Current Sensor, Solid core sensor, 0 - 10 Vdc, 0 - 200 amp range

Greystone CS-651-200 AC Current Sensor, Solid core sensor, 0 - 10 Vdc, 0 - 200 amp range

Regular price $57.85 USD

Regular price Sale price $57.85 USD
Greystone CS-651-20 AC Current Sensor, Mini solid core sensor, 0 - 10 Vdc, 0 - 20 amp range

Greystone CS-651-20 AC Current Sensor, Mini solid core sensor, 0 - 10 Vdc, 0 - 20 amp range

Regular price $50.63 USD

Regular price Sale price $50.63 USD
Greystone CS-651-100 AC Current Sensor, Solid core sensor, 0 - 10 Vdc, 0 - 100 amp range

Greystone CS-651-100 AC Current Sensor, Solid core sensor, 0 - 10 Vdc, 0 - 100 amp range

Regular price $44.44 USD

Regular price Sale price $44.44 USD
Greystone CS-651-10 AC Current Sensor, Mini solid core sensor, 0 - 10 Vdc, 0 - 10 amp range

Greystone CS-651-10 AC Current Sensor, Mini solid core sensor, 0 - 10 Vdc, 0 - 10 amp range

Regular price $50.63 USD

Regular price Sale price $50.63 USD
Greystone CS-650-R2 AC Current Sensor, Solid core sensor, 0 - 5 Vdc, 0 - 50 / 100 / 150 amp ranges, selectable

Greystone CS-650-R2 AC Current Sensor, Solid core sensor, 0 - 5 Vdc, 0 - 50 / 100 / 150 amp ranges, selectable

Regular price $57.85 USD

Regular price Sale price $57.85 USD
Greystone CS-650-R1 AC Current Sensor, Solid core sensor, 0 - 5 Vdc, 0 - 10 / 20 / 50 amp ranges, selectable

Greystone CS-650-R1 AC Current Sensor, Solid core sensor, 0 - 5 Vdc, 0 - 10 / 20 / 50 amp ranges, selectable

Regular price $57.85 USD

Regular price Sale price $57.85 USD
Greystone CS-650-50 AC Current Sensor, Mini solid core sensor, 0 - 5 Vdc, 0 - 50 amp range

Greystone CS-650-50 AC Current Sensor, Mini solid core sensor, 0 - 5 Vdc, 0 - 50 amp range

Regular price $47.01 USD

Regular price Sale price $47.01 USD
Greystone CS-650-200 AC Current Sensor, Solid core sensor, 0 - 5 Vdc, 0 - 200 amp range

Greystone CS-650-200 AC Current Sensor, Solid core sensor, 0 - 5 Vdc, 0 - 200 amp range

Regular price $57.85 USD

Regular price Sale price $57.85 USD
Greystone CS-650-20 AC Current Sensor, Mini solid core sensor, 0 - 5 Vdc, 0 - 20 amp range

Greystone CS-650-20 AC Current Sensor, Mini solid core sensor, 0 - 5 Vdc, 0 - 20 amp range

Regular price $47.01 USD

Regular price Sale price $47.01 USD
Greystone CS-650-10 AC Current Sensor, Mini solid core sensor, 0 - 5 Vdc, 0 - 10 amp range

Greystone CS-650-10 AC Current Sensor, Mini solid core sensor, 0 - 5 Vdc, 0 - 10 amp range

Regular price $47.01 USD

Regular price Sale price $47.01 USD
Greystone CS-GNG-100 Mini solid core 30 Vac/dc switch, MOSFET, Go - No - Go, 0.5 - 100 amps, 0.5 amp trip

Greystone CS-GNG-100 Mini solid core 30 Vac/dc switch, MOSFET, Go - No - Go, 0.5 - 100 amps, 0.5 amp trip

Regular price $44.91 USD

Regular price Sale price $44.91 USD
Greystone CS-GNG-200 Solid core 30 Vac/dc switch, MOSFET, Go-No-Go, 0.75 amp trip

Greystone CS-GNG-200 Solid core 30 Vac/dc switch, MOSFET, Go-No-Go, 0.75 amp trip

Regular price $50.70 USD

Regular price Sale price $50.70 USD
Greystone DPFS9 Differential Pressure Flow Sensor 500mm (20") ABS

Greystone DPFS9 Differential Pressure Flow Sensor 500mm (20") ABS

Regular price $145.31 USD

Regular price Sale price $145.31 USD
Greystone DPFS8 Differential Pressure Flow Sensor 450mm (18") ABS

Greystone DPFS8 Differential Pressure Flow Sensor 450mm (18") ABS

Regular price $131.60 USD

Regular price Sale price $131.60 USD
Greystone DPFS7 Differential Pressure Flow Sensor 380mm (15") ABS

Greystone DPFS7 Differential Pressure Flow Sensor 380mm (15") ABS

Regular price $119.46 USD

Regular price Sale price $119.46 USD
Greystone DPFS6 Differential Pressure Flow Sensor 300mm (12") ABS

Greystone DPFS6 Differential Pressure Flow Sensor 300mm (12") ABS

Regular price $102.38 USD

Regular price Sale price $102.38 USD
Greystone DPFS5 Differential Pressure Flow Sensor 250mm (10") ABS

Greystone DPFS5 Differential Pressure Flow Sensor 250mm (10") ABS

Regular price $76.24 USD

Regular price Sale price $76.24 USD
Greystone DPFS4 Differential Pressure Flow Sensor 200mm (8") ABS

Greystone DPFS4 Differential Pressure Flow Sensor 200mm (8") ABS

Regular price $70.67 USD

Regular price Sale price $70.67 USD
Greystone DPFS3 Differential Pressure Flow Sensor 150mm (6") ABS

Greystone DPFS3 Differential Pressure Flow Sensor 150mm (6") ABS

Regular price $58.35 USD

Regular price Sale price $58.35 USD
Greystone DPFS2 Differential Pressure Flow Sensor 100mm (4") ABS

Greystone DPFS2 Differential Pressure Flow Sensor 100mm (4") ABS

Regular price $54.85 USD

Regular price Sale price $54.85 USD
Greystone DPFS10 Differential Pressure Flow Sensor 560mm (22") ABS

Greystone DPFS10 Differential Pressure Flow Sensor 560mm (22") ABS

Regular price $154.11 USD

Regular price Sale price $154.11 USD
Greystone FPP6-K (Kit contains) Two 150 mm (6") Stainless steel flow pressure probe probe /w 1.83 m pneumatic tubing

Greystone FPP6-K (Kit contains) Two 150 mm (6") Stainless steel flow pressure probe probe /w 1.83 m pneumatic tubing

Regular price $59.83 USD

Regular price Sale price $59.83 USD
Greystone FPP6 150 mm (6") Stainless steel flow pressure probe

Greystone FPP6 150 mm (6") Stainless steel flow pressure probe

Regular price $22.15 USD

Regular price Sale price $22.15 USD
Greystone FPP12-K 300 mm (12") Stainless steel flow pressure probe. Kit with 2 FPP12 probes and pneumatic tubing.

Greystone FPP12-K 300 mm (12") Stainless steel flow pressure probe. Kit with 2 FPP12 probes and pneumatic tubing.

Regular price $66.79 USD

Regular price Sale price $66.79 USD
Greystone FPP12 300 mm (12") Stainless steel flow pressure probe

Greystone FPP12 300 mm (12") Stainless steel flow pressure probe

Regular price $25.85 USD

Regular price Sale price $25.85 USD
Greystone HRC2NT8S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor, override switch.

Greystone HRC2NT8S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor, override switch.

Regular price $200.66 USD

Regular price Sale price $200.66 USD
Greystone HRC2NT8PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor, 0-10K slide pot, override switch.

Greystone HRC2NT8PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor, 0-10K slide pot, override switch.

Regular price $206.19 USD

Regular price Sale price $206.19 USD
Greystone HRC2NT8P Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor, 0-10K slide pot.

Greystone HRC2NT8P Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor, 0-10K slide pot.

Regular price $200.66 USD

Regular price Sale price $200.66 USD
Greystone HRC2NT8 Room Humidity Transmitter 2% c/w LCD, 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor.

Greystone HRC2NT8 Room Humidity Transmitter 2% c/w LCD, 24 Vac/dc supply, jumper selectable outputs, 2.252K ohm temp sensor.

Regular price $195.23 USD

Regular price Sale price $195.23 USD
Greystone HRC2NT7S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor, override switch.

Greystone HRC2NT7S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor, override switch.

Regular price $196.97 USD

Regular price Sale price $196.97 USD
Greystone HRC2NT7PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor, 0-10K slkide pot, override switch.

Greystone HRC2NT7PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor, 0-10K slkide pot, override switch.

Regular price $202.49 USD

Regular price Sale price $202.49 USD
Greystone HRC2NT7P Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor, 0-10K slide pot.

Greystone HRC2NT7P Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor, 0-10K slide pot.

Regular price $196.97 USD

Regular price Sale price $196.97 USD
Greystone HRC2NT6S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor.

Greystone HRC2NT6S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 10,000 ohm type 3 thermistor.

Regular price $191.49 USD

Regular price Sale price $191.49 USD
Greystone HRC2NT6S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 3,000 ohm thermistor, override switch.

Greystone HRC2NT6S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 3,000 ohm thermistor, override switch.

Regular price $196.30 USD

Regular price Sale price $196.30 USD
Greystone HRC2NT6PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 3,000 ohm thermistor, 0-10K slkide pot, override switch.

Greystone HRC2NT6PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 3,000 ohm thermistor, 0-10K slkide pot, override switch.

Regular price $201.79 USD

Regular price Sale price $201.79 USD
Greystone HRC2NT6P Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 13,000 ohm thermistor, 0-10K slide pot.

Greystone HRC2NT6P Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 13,000 ohm thermistor, 0-10K slide pot.

Regular price $196.30 USD

Regular price Sale price $196.30 USD
Greystone HRC2NT6 Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 3,000 ohm thermistor.

Greystone HRC2NT6 Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 3,000 ohm thermistor.

Regular price $190.83 USD

Regular price Sale price $190.83 USD
Greystone HRC2NT5S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 1,800 ohm thermistor, override switch.

Greystone HRC2NT5S Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 1,800 ohm thermistor, override switch.

Regular price $196.30 USD

Regular price Sale price $196.30 USD
Greystone HRC2NT5PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 1,800 ohm thermistor, 0-10K slkide pot, override switch.

Greystone HRC2NT5PS Room Humidity Transmitter 2% c/w 24 Vac/dc supply, jumper selectable outputs, 1,800 ohm thermistor, 0-10K slkide pot, override switch.

Regular price $201.79 USD

Regular price Sale price $201.79 USD

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